Chapter 103. Netty Both producer and consumer are supported The Netty component in Camel is a socket communication component, based on the Netty project version 4. Netty is a NIO client server framework which enables quick and easy development of networkServerInitializerFactory applications such as protocol servers and clients. Netty greatly simplifies and streamlines network programming such as TCP and UDP socket server. This camel component supports both producer and consumer endpoints. The Netty component has several options and allows fine-grained control of a number of TCP/UDP communication parameters (buffer sizes, keepAlives, tcpNoDelay, etc) and facilitates both In-Only and In-Out communication on a Camel route. 103.1. Dependencies When using netty with Red Hat build of Camel Spring Boot make sure to use the following Maven dependency to have support for auto configuration: <dependency> <groupId>org.apache.camel.springboot</groupId> <artifactId>camel-netty-starter</artifactId> </dependency> 103.2. URI format The URI scheme for a netty component is as follows This component supports producer and consumer endpoints for both TCP and UDP. 103.3. Configuring Options Camel components are configured on two separate levels: component level endpoint level 103.3.1. Configuring Component Options At the component level, you set general and shared configurations that are, then, inherited by the endpoints. It is the highest configuration level. For example, a component may have security settings, credentials for authentication, urls for network connection and so forth. Some components only have a few options, and others may have many. Because components typically have pre-configured defaults that are commonly used, then you may often only need to configure a few options on a component; or none at all. You can configure components using: the Component DSL . in a configuration file (application.properties, *.yaml files, etc). directly in the Java code. 103.3.2. Configuring Endpoint Options You usually spend more time setting up endpoints because they have many options. These options help you customize what you want the endpoint to do. The options are also categorized into whether the endpoint is used as a consumer (from), as a producer (to), or both. Configuring endpoints is most often done directly in the endpoint URI as path and query parameters. You can also use the Endpoint DSL and DataFormat DSL as a type safe way of configuring endpoints and data formats in Java. A good practice when configuring options is to use Property Placeholders . Property placeholders provide a few benefits: They help prevent using hardcoded urls, port numbers, sensitive information, and other settings. They allow externalizing the configuration from the code. They help the code to become more flexible and reusable. The following two sections list all the options, firstly for the component followed by the endpoint. 103.4. Component Options The Netty component supports 73 options, which are listed below. Name Description Default Type configuration (common) To use the NettyConfiguration as configuration when creating endpoints. NettyConfiguration disconnect (common) Whether or not to disconnect(close) from Netty Channel right after use. Can be used for both consumer and producer. false boolean keepAlive (common) Setting to ensure socket is not closed due to inactivity. true boolean reuseAddress (common) Setting to facilitate socket multiplexing. true boolean reuseChannel (common) This option allows producers and consumers (in client mode) to reuse the same Netty Channel for the lifecycle of processing the Exchange. This is useful if you need to call a server multiple times in a Camel route and want to use the same network connection. When using this, the channel is not returned to the connection pool until the Exchange is done; or disconnected if the disconnect option is set to true. The reused Channel is stored on the Exchange as an exchange property with the key NettyConstants#NETTY_CHANNEL which allows you to obtain the channel during routing and use it as well. false boolean sync (common) Setting to set endpoint as one-way or request-response. true boolean tcpNoDelay (common) Setting to improve TCP protocol performance. true boolean bridgeErrorHandler (consumer) Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored. false boolean broadcast (consumer) Setting to choose Multicast over UDP. false boolean clientMode (consumer) If the clientMode is true, netty consumer will connect the address as a TCP client. false boolean reconnect (consumer) Used only in clientMode in consumer, the consumer will attempt to reconnect on disconnection if this is enabled. true boolean reconnectInterval (consumer) Used if reconnect and clientMode is enabled. The interval in milli seconds to attempt reconnection. 10000 int backlog (consumer (advanced)) Allows to configure a backlog for netty consumer (server). Note the backlog is just a best effort depending on the OS. Setting this option to a value such as 200, 500 or 1000, tells the TCP stack how long the accept queue can be If this option is not configured, then the backlog depends on OS setting. int bossCount (consumer (advanced)) When netty works on nio mode, it uses default bossCount parameter from Netty, which is 1. User can use this option to override the default bossCount from Netty. 1 int bossGroup (consumer (advanced)) Set the BossGroup which could be used for handling the new connection of the server side across the NettyEndpoint. EventLoopGroup disconnectOnNoReply (consumer (advanced)) If sync is enabled then this option dictates NettyConsumer if it should disconnect where there is no reply to send back. true boolean executorService (consumer (advanced)) To use the given EventExecutorGroup. EventExecutorGroup maximumPoolSize (consumer (advanced)) Sets a maximum thread pool size for the netty consumer ordered thread pool. The default size is 2 x cpu_core plus 1. Setting this value to eg 10 will then use 10 threads unless 2 x cpu_core plus 1 is a higher value, which then will override and be used. For example if there are 8 cores, then the consumer thread pool will be 17. This thread pool is used to route messages received from Netty by Camel. We use a separate thread pool to ensure ordering of messages and also in case some messages will block, then nettys worker threads (event loop) wont be affected. int nettyServerBootstrapFactory (consumer (advanced)) To use a custom NettyServerBootstrapFactory. NettyServerBootstrapFactory networkInterface (consumer (advanced)) When using UDP then this option can be used to specify a network interface by its name, such as eth0 to join a multicast group. String noReplyLogLevel (consumer (advanced)) If sync is enabled this option dictates NettyConsumer which logging level to use when logging a there is no reply to send back. Enum values: TRACE DEBUG INFO WARN ERROR OFF WARN LoggingLevel serverClosedChannelExceptionCaughtLogLevel (consumer (advanced)) If the server (NettyConsumer) catches an java.nio.channels.ClosedChannelException then its logged using this logging level. This is used to avoid logging the closed channel exceptions, as clients can disconnect abruptly and then cause a flood of closed exceptions in the Netty server. Enum values: TRACE DEBUG INFO WARN ERROR OFF DEBUG LoggingLevel serverExceptionCaughtLogLevel (consumer (advanced)) If the server (NettyConsumer) catches an exception then its logged using this logging level. Enum values: TRACE DEBUG INFO WARN ERROR OFF WARN LoggingLevel serverInitializerFactory (consumer (advanced)) To use a custom ServerInitializerFactory. ServerInitializerFactory usingExecutorService (consumer (advanced)) Whether to use ordered thread pool, to ensure events are processed orderly on the same channel. true boolean connectTimeout (producer) Time to wait for a socket connection to be available. Value is in milliseconds. 10000 int lazyStartProducer (producer) Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel's routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing. false boolean requestTimeout (producer) Allows to use a timeout for the Netty producer when calling a remote server. By default no timeout is in use. The value is in milli seconds, so eg 30000 is 30 seconds. The requestTimeout is using Netty's ReadTimeoutHandler to trigger the timeout. long clientInitializerFactory (producer (advanced)) To use a custom ClientInitializerFactory. ClientInitializerFactory correlationManager (producer (advanced)) To use a custom correlation manager to manage how request and reply messages are mapped when using request/reply with the netty producer. This should only be used if you have a way to map requests together with replies such as if there is correlation ids in both the request and reply messages. This can be used if you want to multiplex concurrent messages on the same channel (aka connection) in netty. When doing this you must have a way to correlate the request and reply messages so you can store the right reply on the inflight Camel Exchange before its continued routed. We recommend extending the TimeoutCorrelationManagerSupport when you build custom correlation managers. This provides support for timeout and other complexities you otherwise would need to implement as well. See also the producerPoolEnabled option for more details. NettyCamelStateCorrelationManager lazyChannelCreation (producer (advanced)) Channels can be lazily created to avoid exceptions, if the remote server is not up and running when the Camel producer is started. true boolean producerPoolEnabled (producer (advanced)) Whether producer pool is enabled or not. Important: If you turn this off then a single shared connection is used for the producer, also if you are doing request/reply. That means there is a potential issue with interleaved responses if replies comes back out-of-order. Therefore you need to have a correlation id in both the request and reply messages so you can properly correlate the replies to the Camel callback that is responsible for continue processing the message in Camel. To do this you need to implement NettyCamelStateCorrelationManager as correlation manager and configure it via the correlationManager option. See also the correlationManager option for more details. true boolean producerPoolMaxIdle (producer (advanced)) Sets the cap on the number of idle instances in the pool. 100 int producerPoolMaxTotal (producer (advanced)) Sets the cap on the number of objects that can be allocated by the pool (checked out to clients, or idle awaiting checkout) at a given time. Use a negative value for no limit. -1 int producerPoolMinEvictableIdle (producer (advanced)) Sets the minimum amount of time (value in millis) an object may sit idle in the pool before it is eligible for eviction by the idle object evictor. 300000 long producerPoolMinIdle (producer (advanced)) Sets the minimum number of instances allowed in the producer pool before the evictor thread (if active) spawns new objects. int udpConnectionlessSending (producer (advanced)) This option supports connection less udp sending which is a real fire and forget. A connected udp send receive the PortUnreachableException if no one is listen on the receiving port. false boolean useByteBuf (producer (advanced)) If the useByteBuf is true, netty producer will turn the message body into ByteBuf before sending it out. false boolean hostnameVerification ( security) To enable/disable hostname verification on SSLEngine. false boolean allowSerializedHeaders (advanced) Only used for TCP when transferExchange is true. When set to true, serializable objects in headers and properties will be added to the exchange. Otherwise Camel will exclude any non-serializable objects and log it at WARN level. false boolean autowiredEnabled (advanced) Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc. true boolean channelGroup (advanced) To use a explicit ChannelGroup. ChannelGroup nativeTransport (advanced) Whether to use native transport instead of NIO. Native transport takes advantage of the host operating system and is only supported on some platforms. You need to add the netty JAR for the host operating system you are using. See more details at: . false boolean options (advanced) Allows to configure additional netty options using option. as prefix. For example option.child.keepAlive=false to set the netty option child.keepAlive=false. See the Netty documentation for possible options that can be used. Map receiveBufferSize (advanced) The TCP/UDP buffer sizes to be used during inbound communication. Size is bytes. 65536 int receiveBufferSizePredictor (advanced) Configures the buffer size predictor. See details at Jetty documentation and this mail thread. int sendBufferSize (advanced) The TCP/UDP buffer sizes to be used during outbound communication. Size is bytes. 65536 int transferExchange (advanced) Only used for TCP. You can transfer the exchange over the wire instead of just the body. The following fields are transferred: In body, Out body, fault body, In headers, Out headers, fault headers, exchange properties, exchange exception. This requires that the objects are serializable. Camel will exclude any non-serializable objects and log it at WARN level. false boolean udpByteArrayCodec (advanced) For UDP only. If enabled the using byte array codec instead of Java serialization protocol. false boolean workerCount (advanced) When netty works on nio mode, it uses default workerCount parameter from Netty (which is cpu_core_threads x 2). User can use this option to override the default workerCount from Netty. int workerGroup (advanced) To use a explicit EventLoopGroup as the boss thread pool. For example to share a thread pool with multiple consumers or producers. By default each consumer or producer has their own worker pool with 2 x cpu count core threads. EventLoopGroup allowDefaultCodec (codec) The netty component installs a default codec if both, encoder/decoder is null and textline is false. Setting allowDefaultCodec to false prevents the netty component from installing a default codec as the first element in the filter chain. true boolean autoAppendDelimiter (codec) Whether or not to auto append missing end delimiter when sending using the textline codec. true boolean decoderMaxLineLength (codec) The max line length to use for the textline codec. 1024 int decoders (codec) A list of decoders to be used. You can use a String which have values separated by comma, and have the values be looked up in the Registry. Just remember to prefix the value with # so Camel knows it should lookup. List delimiter (codec) The delimiter to use for the textline codec. Possible values are LINE and NULL. Enum values: LINE NULL LINE TextLineDelimiter encoders (codec) A list of encoders to be used. You can use a String which have values separated by comma, and have the values be looked up in the Registry. Just remember to prefix the value with # so Camel knows it should lookup. List encoding (codec) The encoding (a charset name) to use for the textline codec. If not provided, Camel will use the JVM default Charset. String textline (codec) Only used for TCP. If no codec is specified, you can use this flag to indicate a text line based codec; if not specified or the value is false, then Object Serialization is assumed over TCP - however only Strings are allowed to be serialized by default. false boolean enabledProtocols (security) Which protocols to enable when using SSL. TLSv1,TLSv1.1,TLSv1.2 String keyStoreFile (security) Client side certificate keystore to be used for encryption. File keyStoreFormat (security) Keystore format to be used for payload encryption. Defaults to JKS if not set. String keyStoreResource (security) Client side certificate keystore to be used for encryption. Is loaded by default from classpath, but you can prefix with classpath:, file:, or http: to load the resource from different systems. String needClientAuth (security) Configures whether the server needs client authentication when using SSL. false boolean passphrase (security) Password setting to use in order to encrypt/decrypt payloads sent using SSH. String securityProvider (security) Security provider to be used for payload encryption. Defaults to SunX509 if not set. String ssl (security) Setting to specify whether SSL encryption is applied to this endpoint. false boolean sslClientCertHeaders (security) When enabled and in SSL mode, then the Netty consumer will enrich the Camel Message with headers having information about the client certificate such as subject name, issuer name, serial number, and the valid date range. false boolean sslContextParameters (security) To configure security using SSLContextParameters. SSLContextParameters sslHandler (security) Reference to a class that could be used to return an SSL Handler. SslHandler trustStoreFile (security) Server side certificate keystore to be used for encryption. File trustStoreResource (security) Server side certificate keystore to be used for encryption. Is loaded by default from classpath, but you can prefix with classpath:, file:, or http: to load the resource from different systems. String useGlobalSslContextParameters (security) Enable usage of global SSL context parameters. false boolean 103.5. Endpoint Options The Netty endpoint is configured using URI syntax: with the following path and query parameters: 103.5.1. Path Parameters (3 parameters) Name Description Default Type protocol (common) Required The protocol to use which can be tcp or udp. Enum values: tcp udp String host (common) Required The hostname. For the consumer the hostname is localhost or 0.0.0.0. For the producer the hostname is the remote host to connect to. String port (common) Required The host port number. int 103.5.2. Query Parameters (71 parameters) Name Description Default Type disconnect (common) Whether or not to disconnect(close) from Netty Channel right after use. Can be used for both consumer and producer. false boolean keepAlive (common) Setting to ensure socket is not closed due to inactivity. true boolean reuseAddress (common) Setting to facilitate socket multiplexing. true boolean reuseChannel (common) This option allows producers and consumers (in client mode) to reuse the same Netty Channel for the lifecycle of processing the Exchange. This is useful if you need to call a server multiple times in a Camel route and want to use the same network connection. When using this, the channel is not returned to the connection pool until the Exchange is done; or disconnected if the disconnect option is set to true. The reused Channel is stored on the Exchange as an exchange property with the key NettyConstants#NETTY_CHANNEL which allows you to obtain the channel during routing and use it as well. false boolean sync (common) Setting to set endpoint as one-way or request-response. true boolean tcpNoDelay (common) Setting to improve TCP protocol performance. true boolean bridgeErrorHandler (consumer) Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored. false boolean broadcast (consumer) Setting to choose Multicast over UDP. false boolean clientMode (consumer) If the clientMode is true, netty consumer will connect the address as a TCP client. false boolean reconnect (consumer) Used only in clientMode in consumer, the consumer will attempt to reconnect on disconnection if this is enabled. true boolean reconnectInterval (consumer) Used if reconnect and clientMode is enabled. The interval in milli seconds to attempt reconnection. 10000 int backlog (consumer (advanced)) Allows to configure a backlog for netty consumer (server). Note the backlog is just a best effort depending on the OS. Setting this option to a value such as 200, 500 or 1000, tells the TCP stack how long the accept queue can be If this option is not configured, then the backlog depends on OS setting. int bossCount (consumer (advanced)) When netty works on nio mode, it uses default bossCount parameter from Netty, which is 1. User can use this option to override the default bossCount from Netty. 1 int bossGroup (consumer (advanced)) Set the BossGroup which could be used for handling the new connection of the server side across the NettyEndpoint. EventLoopGroup disconnectOnNoReply (consumer (advanced)) If sync is enabled then this option dictates NettyConsumer if it should disconnect where there is no reply to send back. true boolean exceptionHandler (consumer (advanced)) To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this option is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored. ExceptionHandler exchangePattern (consumer (advanced)) Sets the exchange pattern when the consumer creates an exchange. Enum values: InOnly InOut InOptionalOut ExchangePattern nettyServerBootstrapFactory (consumer (advanced)) To use a custom NettyServerBootstrapFactory. NettyServerBootstrapFactory networkInterface (consumer (advanced)) When using UDP then this option can be used to specify a network interface by its name, such as eth0 to join a multicast group. String noReplyLogLevel (consumer (advanced)) If sync is enabled this option dictates NettyConsumer which logging level to use when logging a there is no reply to send back. Enum values: TRACE DEBUG INFO WARN ERROR OFF WARN LoggingLevel serverClosedChannelExceptionCaughtLogLevel (consumer (advanced)) If the server (NettyConsumer) catches an java.nio.channels.ClosedChannelException then its logged using this logging level. This is used to avoid logging the closed channel exceptions, as clients can disconnect abruptly and then cause a flood of closed exceptions in the Netty server. Enum values: TRACE DEBUG INFO WARN ERROR OFF DEBUG LoggingLevel serverExceptionCaughtLogLevel (consumer (advanced)) If the server (NettyConsumer) catches an exception then its logged using this logging level. Enum values: TRACE DEBUG INFO WARN ERROR OFF WARN LoggingLevel serverInitializerFactory (consumer (advanced)) To use a custom ServerInitializerFactory. ServerInitializerFactory usingExecutorService (consumer (advanced)) Whether to use ordered thread pool, to ensure events are processed orderly on the same channel. true boolean connectTimeout (producer) Time to wait for a socket connection to be available. Value is in milliseconds. 10000 int lazyStartProducer (producer) Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel's routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing. false boolean requestTimeout (producer) Allows to use a timeout for the Netty producer when calling a remote server. By default no timeout is in use. The value is in milli seconds, so eg 30000 is 30 seconds. The requestTimeout is using Netty's ReadTimeoutHandler to trigger the timeout. long clientInitializerFactory (producer (advanced)) To use a custom ClientInitializerFactory. ClientInitializerFactory correlationManager (producer (advanced)) To use a custom correlation manager to manage how request and reply messages are mapped when using request/reply with the netty producer. This should only be used if you have a way to map requests together with replies such as if there is correlation ids in both the request and reply messages. This can be used if you want to multiplex concurrent messages on the same channel (aka connection) in netty. When doing this you must have a way to correlate the request and reply messages so you can store the right reply on the inflight Camel Exchange before its continued routed. We recommend extending the TimeoutCorrelationManagerSupport when you build custom correlation managers. This provides support for timeout and other complexities you otherwise would need to implement as well. See also the producerPoolEnabled option for more details. NettyCamelStateCorrelationManager lazyChannelCreation (producer (advanced)) Channels can be lazily created to avoid exceptions, if the remote server is not up and running when the Camel producer is started. true boolean producerPoolEnabled (producer (advanced)) Whether producer pool is enabled or not. Important: If you turn this off then a single shared connection is used for the producer, also if you are doing request/reply. That means there is a potential issue with interleaved responses if replies comes back out-of-order. Therefore you need to have a correlation id in both the request and reply messages so you can properly correlate the replies to the Camel callback that is responsible for continue processing the message in Camel. To do this you need to implement NettyCamelStateCorrelationManager as correlation manager and configure it via the correlationManager option. See also the correlationManager option for more details. true boolean producerPoolMaxIdle (producer (advanced)) Sets the cap on the number of idle instances in the pool. 100 int producerPoolMaxTotal (producer (advanced)) Sets the cap on the number of objects that can be allocated by the pool (checked out to clients, or idle awaiting checkout) at a given time. Use a negative value for no limit. -1 int producerPoolMinEvictableIdle (producer (advanced)) Sets the minimum amount of time (value in millis) an object may sit idle in the pool before it is eligible for eviction by the idle object evictor. 300000 long producerPoolMinIdle (producer (advanced)) Sets the minimum number of instances allowed in the producer pool before the evictor thread (if active) spawns new objects. int udpConnectionlessSending (producer (advanced)) This option supports connection less udp sending which is a real fire and forget. A connected udp send receive the PortUnreachableException if no one is listen on the receiving port. false boolean useByteBuf (producer (advanced)) If the useByteBuf is true, netty producer will turn the message body into ByteBuf before sending it out. false boolean hostnameVerification ( security) To enable/disable hostname verification on SSLEngine. false boolean allowSerializedHeaders (advanced) Only used for TCP when transferExchange is true. When set to true, serializable objects in headers and properties will be added to the exchange. Otherwise Camel will exclude any non-serializable objects and log it at WARN level. false boolean channelGroup (advanced) To use a explicit ChannelGroup. ChannelGroup nativeTransport (advanced) Whether to use native transport instead of NIO. Native transport takes advantage of the host operating system and is only supported on some platforms. You need to add the netty JAR for the host operating system you are using. See more details at: . false boolean options (advanced) Allows to configure additional netty options using option. as prefix. For example option.child.keepAlive=false to set the netty option child.keepAlive=false. See the Netty documentation for possible options that can be used. Map receiveBufferSize (advanced) The TCP/UDP buffer sizes to be used during inbound communication. Size is bytes. 65536 int receiveBufferSizePredictor (advanced) Configures the buffer size predictor. See details at Jetty documentation and this mail thread. int sendBufferSize (advanced) The TCP/UDP buffer sizes to be used during outbound communication. Size is bytes. 65536 int synchronous (advanced) Sets whether synchronous processing should be strictly used. false boolean transferExchange (advanced) Only used for TCP. You can transfer the exchange over the wire instead of just the body. The following fields are transferred: In body, Out body, fault body, In headers, Out headers, fault headers, exchange properties, exchange exception. This requires that the objects are serializable. Camel will exclude any non-serializable objects and log it at WARN level. false boolean udpByteArrayCodec (advanced) For UDP only. If enabled the using byte array codec instead of Java serialization protocol. false boolean workerCount (advanced) When netty works on nio mode, it uses default workerCount parameter from Netty (which is cpu_core_threads x 2). User can use this option to override the default workerCount from Netty. int workerGroup (advanced) To use a explicit EventLoopGroup as the boss thread pool. For example to share a thread pool with multiple consumers or producers. By default each consumer or producer has their own worker pool with 2 x cpu count core threads. EventLoopGroup allowDefaultCodec (codec) The netty component installs a default codec if both, encoder/decoder is null and textline is false. Setting allowDefaultCodec to false prevents the netty component from installing a default codec as the first element in the filter chain. true boolean autoAppendDelimiter (codec) Whether or not to auto append missing end delimiter when sending using the textline codec. true boolean decoderMaxLineLength (codec) The max line length to use for the textline codec. 1024 int decoders (codec) A list of decoders to be used. You can use a String which have values separated by comma, and have the values be looked up in the Registry. Just remember to prefix the value with # so Camel knows it should lookup. List delimiter (codec) The delimiter to use for the textline codec. Possible values are LINE and NULL. Enum values: LINE NULL LINE TextLineDelimiter encoders (codec) A list of encoders to be used. You can use a String which have values separated by comma, and have the values be looked up in the Registry. Just remember to prefix the value with # so Camel knows it should lookup. List encoding (codec) The encoding (a charset name) to use for the textline codec. If not provided, Camel will use the JVM default Charset. String textline (codec) Only used for TCP. If no codec is specified, you can use this flag to indicate a text line based codec; if not specified or the value is false, then Object Serialization is assumed over TCP - however only Strings are allowed to be serialized by default. false boolean enabledProtocols (security) Which protocols to enable when using SSL. TLSv1,TLSv1.1,TLSv1.2 String keyStoreFile (security) Client side certificate keystore to be used for encryption. File keyStoreFormat (security) Keystore format to be used for payload encryption. Defaults to JKS if not set. String keyStoreResource (security) Client side certificate keystore to be used for encryption. Is loaded by default from classpath, but you can prefix with classpath:, file:, or http: to load the resource from different systems. String needClientAuth (security) Configures whether the server needs client authentication when using SSL. false boolean passphrase (security) Password setting to use in order to encrypt/decrypt payloads sent using SSH. String securityProvider (security) Security provider to be used for payload encryption. Defaults to SunX509 if not set. String ssl (security) Setting to specify whether SSL encryption is applied to this endpoint. false boolean sslClientCertHeaders (security) When enabled and in SSL mode, then the Netty consumer will enrich the Camel Message with headers having information about the client certificate such as subject name, issuer name, serial number, and the valid date range. false boolean sslContextParameters (security) To configure security using SSLContextParameters. SSLContextParameters sslHandler (security) Reference to a class that could be used to return an SSL Handler. SslHandler trustStoreFile (security) Server side certificate keystore to be used for encryption. File trustStoreResource (security) Server side certificate keystore to be used for encryption. Is loaded by default from classpath, but you can prefix with classpath:, file:, or http: to load the resource from different systems. String 103.6. Registry based Options Codec Handlers and SSL Keystores can be enlisted in the Registry, such as in the Spring XML file. The values that could be passed in, are the following: Name Description passphrase password setting to use in order to encrypt/decrypt payloads sent using SSH keyStoreFormat keystore format to be used for payload encryption. Defaults to "JKS" if not set securityProvider Security provider to be used for payload encryption. Defaults to "SunX509" if not set. keyStoreFile deprecated: Client side certificate keystore to be used for encryption trustStoreFile deprecated: Server side certificate keystore to be used for encryption keyStoreResource Client side certificate keystore to be used for encryption. Is loaded by default from classpath, but you can prefix with "classpath:" , "file:" , or "http:" to load the resource from different systems. trustStoreResource Server side certificate keystore to be used for encryption. Is loaded by default from classpath, but you can prefix with "classpath:" , "file:" , or "http:" to load the resource from different systems. sslHandler Reference to a class that could be used to return an SSL Handler encoder A custom ChannelHandler class that can be used to perform special marshalling of outbound payloads. Must override io.netty.channel.ChannelInboundHandlerAdapter. encoders A list of encoders to be used. You can use a String which have values separated by comma, and have the values be looked up in the Registry. Just remember to prefix the value with # so Camel knows it should lookup. decoder A custom ChannelHandler class that can be used to perform special marshalling of inbound payloads. Must override io.netty.channel.ChannelOutboundHandlerAdapter. decoders A list of decoders to be used. You can use a String which have values separated by comma, and have the values be looked up in the Registry. Just remember to prefix the value with # so Camel knows it should lookup. Note Read below about using non shareable encoders/decoders. 103.6.1. Using non shareable encoders or decoders If your encoders or decoders are not shareable (e.g. they don't have the @Shareable class annotation), then your encoder/decoder must implement the org.apache.camel.component.netty.ChannelHandlerFactory interface, and return a new instance in the newChannelHandler method. This is to ensure the encoder/decoder can safely be used. If this is not the case, then the Netty component will log a WARN when an endpoint is created. The Netty component offers a org.apache.camel.component.netty.ChannelHandlerFactories factory class, that has a number of commonly used methods. 103.7. Sending Messages to/from a Netty endpoint 103.7.1. Netty Producer In Producer mode, the component provides the ability to send payloads to a socket endpoint using either TCP or UDP protocols (with optional SSL support). The producer mode supports both one-way and request-response based operations. 103.7.2. Netty Consumer In Consumer mode, the component provides the ability to: listen on a specified socket using either TCP or UDP protocols (with optional SSL support), receive requests on the socket using text/xml, binary and serialized object based payloads and send them along on a route as message exchanges. The consumer mode supports both one-way and request-response based operations. 103.8. Examples 103.8.1. A UDP Netty endpoint using Request-Reply and serialized object payload Note that Object serialization is not allowed by default, and so a decoder must be configured. @BindToRegistry("decoder") public ChannelHandler getDecoder() throws Exception { return new DefaultChannelHandlerFactory() { @Override public ChannelHandler newChannelHandler() { return new DatagramPacketObjectDecoder(ClassResolvers.weakCachingResolver(null)); } }; } RouteBuilder builder = new RouteBuilder() { public void configure() { from("netty:udp://0.0.0.0:5155?sync=true&decoders=#decoder") .process(new Processor() { public void process(Exchange exchange) throws Exception { Poetry poetry = (Poetry) exchange.getIn().getBody(); // Process poetry in some way exchange.getOut().setBody("Message received); } } } }; 103.8.2. A TCP based Netty consumer endpoint using One-way communication RouteBuilder builder = new RouteBuilder() { public void configure() { from("netty:tcp://0.0.0.0:5150") .to("mock:result"); } }; 103.8.3. An SSL/TCP based Netty consumer endpoint using Request-Reply communication Using the JSSE Configuration Utility The Netty component supports SSL/TLS configuration through the Camel JSSE Configuration Utility . This utility greatly decreases the amount of component specific code you need to write and is configurable at the endpoint and component levels. The following examples demonstrate how to use the utility with the Netty component. Programmatic configuration of the component KeyStoreParameters ksp = new KeyStoreParameters(); ksp.setResource("/users/home/server/keystore.jks"); ksp.setPassword("keystorePassword"); KeyManagersParameters kmp = new KeyManagersParameters(); kmp.setKeyStore(ksp); kmp.setKeyPassword("keyPassword"); SSLContextParameters scp = new SSLContextParameters(); scp.setKeyManagers(kmp); NettyComponent nettyComponent = getContext().getComponent("netty", NettyComponent.class); nettyComponent.setSslContextParameters(scp); Spring DSL based configuration of endpoint ... <camel:sslContextParameters id="sslContextParameters"> <camel:keyManagers keyPassword="keyPassword"> <camel:keyStore resource="/users/home/server/keystore.jks" password="keystorePassword"/> </camel:keyManagers> </camel:sslContextParameters>... ... <to uri="netty:tcp://0.0.0.0:5150?sync=true&ssl=true&sslContextParameters=#sslContextParameters"/> ... Using Basic SSL/TLS configuration on the Jetty Component Registry registry = context.getRegistry(); registry.bind("password", "changeit"); registry.bind("ksf", new File("src/test/resources/keystore.jks")); registry.bind("tsf", new File("src/test/resources/keystore.jks")); context.addRoutes(new RouteBuilder() { public void configure() { String netty_ssl_endpoint = "netty:tcp://0.0.0.0:5150?sync=true&ssl=true&passphrase=#password" + "&keyStoreFile=#ksf&trustStoreFile=#tsf"; String return_string = "When You Go Home, Tell Them Of Us And Say," + "For Your Tomorrow, We Gave Our Today."; from(netty_ssl_endpoint) .process(new Processor() { public void process(Exchange exchange) throws Exception { exchange.getOut().setBody(return_string); } } } }); Getting access to SSLSession and the client certificate You can get access to the javax.net.ssl.SSLSession if you eg need to get details about the client certificate. When ssl=true then the Netty component will store the SSLSession as a header on the Camel Message as shown below: SSLSession session = exchange.getIn().getHeader(NettyConstants.NETTY_SSL_SESSION, SSLSession.class); // get the first certificate which is client certificate javax.security.cert.X509Certificate cert = session.getPeerCertificateChain()[0]; Principal principal = cert.getSubjectDN(); Remember to set needClientAuth=true to authenticate the client, otherwise SSLSession cannot access information about the client certificate, and you may get an exception javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated . You may also get this exception if the client certificate is expired or not valid etc. Note The option sslClientCertHeaders can be set to true which then enriches the Camel Message with headers having details about the client certificate. For example the subject name is readily available in the header CamelNettySSLClientCertSubjectName . 103.8.4. Using Multiple Codecs In certain cases it may be necessary to add chains of encoders and decoders to the netty pipeline. To add multpile codecs to a camel netty endpoint the 'encoders' and 'decoders' uri parameters should be used. Like the 'encoder' and 'decoder' parameters they are used to supply references (lists of ChannelUpstreamHandlers and ChannelDownstreamHandlers) that should be added to the pipeline. Note that if encoders is specified then the encoder param will be ignored, similarly for decoders and the decoder param. Note Read further above about using non shareable encoders/decoders. The lists of codecs need to be added to the Camel's registry so they can be resolved when the endpoint is created. ChannelHandlerFactory lengthDecoder = ChannelHandlerFactories.newLengthFieldBasedFrameDecoder(1048576, 0, 4, 0, 4); StringDecoder stringDecoder = new StringDecoder(); registry.bind("length-decoder", lengthDecoder); registry.bind("string-decoder", stringDecoder); LengthFieldPrepender lengthEncoder = new LengthFieldPrepender(4); StringEncoder stringEncoder = new StringEncoder(); registry.bind("length-encoder", lengthEncoder); registry.bind("string-encoder", stringEncoder); List<ChannelHandler> decoders = new ArrayList<ChannelHandler>(); decoders.add(lengthDecoder); decoders.add(stringDecoder); List<ChannelHandler> encoders = new ArrayList<ChannelHandler>(); encoders.add(lengthEncoder); encoders.add(stringEncoder); registry.bind("encoders", encoders); registry.bind("decoders", decoders); Spring's native collections support can be used to specify the codec lists in an application context <util:list id="decoders" list-class="java.util.LinkedList"> <bean class="org.apache.camel.component.netty.ChannelHandlerFactories" factory-method="newLengthFieldBasedFrameDecoder"> <constructor-arg value="1048576"/> <constructor-arg value="0"/> <constructor-arg value="4"/> <constructor-arg value="0"/> <constructor-arg value="4"/> </bean> <bean class="io.netty.handler.codec.string.StringDecoder"/> </util:list> <util:list id="encoders" list-class="java.util.LinkedList"> <bean class="io.netty.handler.codec.LengthFieldPrepender"> <constructor-arg value="4"/> </bean> <bean class="io.netty.handler.codec.string.StringEncoder"/> </util:list> <bean id="length-encoder" class="io.netty.handler.codec.LengthFieldPrepender"> <constructor-arg value="4"/> </bean> <bean id="string-encoder" class="io.netty.handler.codec.string.StringEncoder"/> <bean id="length-decoder" class="org.apache.camel.component.netty.ChannelHandlerFactories" factory-method="newLengthFieldBasedFrameDecoder"> <constructor-arg value="1048576"/> <constructor-arg value="0"/> <constructor-arg value="4"/> <constructor-arg value="0"/> <constructor-arg value="4"/> </bean> <bean id="string-decoder" class="io.netty.handler.codec.string.StringDecoder"/> The bean names can then be used in netty endpoint definitions either as a comma separated list or contained in a List e.g. from("direct:multiple-codec").to("netty:tcp://0.0.0.0:{{port}}?encoders=#encoders&sync=false"); from("netty:tcp://0.0.0.0:{{port}}?decoders=#length-decoder,#string-decoder&sync=false").to("mock:multiple-codec"); or via XML. <camelContext id="multiple-netty-codecs-context" xmlns="http://camel.apache.org/schema/spring"> <route> <from uri="direct:multiple-codec"/> <to uri="netty:tcp://0.0.0.0:5150?encoders=#encoders&amp;sync=false"/> </route> <route> <from uri="netty:tcp://0.0.0.0:5150?decoders=#length-decoder,#string-decoder&amp;sync=false"/> <to uri="mock:multiple-codec"/> </route> </camelContext> 103.9. Closing Channel When Complete When acting as a server you sometimes want to close the channel when, for example, a client conversion is finished. You can do this by simply setting the endpoint option disconnect=true . However you can also instruct Camel on a per message basis as follows. To instruct Camel to close the channel, you should add a header with the key CamelNettyCloseChannelWhenComplete set to a boolean true value. For instance, the example below will close the channel after it has written the bye message back to the client: from("netty:tcp://0.0.0.0:8080").process(new Processor() { public void process(Exchange exchange) throws Exception { String body = exchange.getIn().getBody(String.class); exchange.getOut().setBody("Bye " + body); // some condition which determines if we should close if (close) { exchange.getOut().setHeader(NettyConstants.NETTY_CLOSE_CHANNEL_WHEN_COMPLETE, true); } } }); Adding custom channel pipeline factories to gain complete control over a created pipeline. 103.10. Custom pipeline Custom channel pipelines provide complete control to the user over the handler/interceptor chain by inserting custom handler(s), encoder(s) & decoder(s) without having to specify them in the Netty Endpoint URL in a very simple way. In order to add a custom pipeline, a custom channel pipeline factory must be created and registered with the context via the context registry (Registry, or the camel-spring ApplicationContextRegistry etc). A custom pipeline factory must be constructed as follows A Producer linked channel pipeline factory must extend the abstract class ClientPipelineFactory . A Consumer linked channel pipeline factory must extend the abstract class ServerInitializerFactory . The classes should override the initChannel() method in order to insert custom handler(s), encoder(s) and decoder(s). Not overriding the initChannel() method creates a pipeline with no handlers, encoders or decoders wired to the pipeline. The example below shows how ServerInitializerFactory factory may be created 103.10.1. Using custom pipeline factory public class SampleServerInitializerFactory extends ServerInitializerFactory { private int maxLineSize = 1024; protected void initChannel(Channel ch) throws Exception { ChannelPipeline channelPipeline = ch.pipeline(); channelPipeline.addLast("encoder-SD", new StringEncoder(CharsetUtil.UTF_8)); channelPipeline.addLast("decoder-DELIM", new DelimiterBasedFrameDecoder(maxLineSize, true, Delimiters.lineDelimiter())); channelPipeline.addLast("decoder-SD", new StringDecoder(CharsetUtil.UTF_8)); // here we add the default Camel ServerChannelHandler for the consumer, to allow Camel to route the message etc. channelPipeline.addLast("handler", new ServerChannelHandler(consumer)); } } The custom channel pipeline factory can then be added to the registry and instantiated/utilized on a camel route in the following way Registry registry = camelContext.getRegistry(); ServerInitializerFactory factory = new TestServerInitializerFactory(); registry.bind("spf", factory); context.addRoutes(new RouteBuilder() { public void configure() { String netty_ssl_endpoint = "netty:tcp://0.0.0.0:5150?serverInitializerFactory=#spf" String return_string = "When You Go Home, Tell Them Of Us And Say," + "For Your Tomorrow, We Gave Our Today."; from(netty_ssl_endpoint) .process(new Processor() { public void process(Exchange exchange) throws Exception { exchange.getOut().setBody(return_string); } } } }); 103.11. Reusing Netty boss and worker thread pools Netty has two kind of thread pools: boss and worker. By default each Netty consumer and producer has their private thread pools. If you want to reuse these thread pools among multiple consumers or producers then the thread pools must be created and enlisted in the Registry. For example using Spring XML we can create a shared worker thread pool using the NettyWorkerPoolBuilder with 2 worker threads as shown below: <!-- use the worker pool builder to help create the shared thread pool --> <bean id="poolBuilder" class="org.apache.camel.component.netty.NettyWorkerPoolBuilder"> <property name="workerCount" value="2"/> </bean> <!-- the shared worker thread pool --> <bean id="sharedPool" class="org.jboss.netty.channel.socket.nio.WorkerPool" factory-bean="poolBuilder" factory-method="build" destroy-method="shutdown"> </bean> Note For boss thread pool there is a org.apache.camel.component.netty.NettyServerBossPoolBuilder builder for Netty consumers, and a org.apache.camel.component.netty.NettyClientBossPoolBuilder for the Netty producers. Then in the Camel routes we can refer to this worker pools by configuring the workerPool option in the URI as shown below: <route> <from uri="netty:tcp://0.0.0.0:5021?textline=true&amp;sync=true&amp;workerPool=#sharedPool&amp;usingExecutorService=false"/> <to uri="log:result"/> ... </route> And if we have another route we can refer to the shared worker pool: <route> <from uri="netty:tcp://0.0.0.0:5022?textline=true&amp;sync=true&amp;workerPool=#sharedPool&amp;usingExecutorService=false"/> <to uri="log:result"/> ... </route> and so forth. 103.12. Multiplexing concurrent messages over a single connection with request/reply When using Netty for request/reply messaging via the netty producer then by default each message is sent via a non-shared connection (pooled). This ensures that replies are automatic being able to map to the correct request thread for further routing in Camel. In other words correlation between request/reply messages happens out-of-the-box because the replies comes back on the same connection that was used for sending the request; and this connection is not shared with others. When the response comes back, the connection is returned back to the connection pool, where it can be reused by others. However if you want to multiplex concurrent request/responses on a single shared connection, then you need to turn off the connection pooling by setting producerPoolEnabled=false . Now this means there is a potential issue with interleaved responses if replies comes back out-of-order. Therefore you need to have a correlation id in both the request and reply messages so you can properly correlate the replies to the Camel callback that is responsible for continue processing the message in Camel. To do this you need to implement NettyCamelStateCorrelationManager as correlation manager and configure it via the correlationManager=#myManager option. Note We recommend extending the TimeoutCorrelationManagerSupport when you build custom correlation managers. This provides support for timeout and other complexities you otherwise would need to implement as well. You can find an example with the Apache Camel source code in the examples directory under the camel-example-netty-custom-correlation directory. 103.13. Spring Boot Auto-Configuration The component supports 74 options, which are listed below. Name Description Default Type camel.component.netty.allow-default-codec The netty component installs a default codec if both, encoder/decoder is null and textline is false. Setting allowDefaultCodec to false prevents the netty component from installing a default codec as the first element in the filter chain. true Boolean camel.component.netty.allow-serialized-headers Only used for TCP when transferExchange is true. When set to true, serializable objects in headers and properties will be added to the exchange. Otherwise Camel will exclude any non-serializable objects and log it at WARN level. false Boolean camel.component.netty.auto-append-delimiter Whether or not to auto append missing end delimiter when sending using the textline codec. true Boolean camel.component.netty.autowired-enabled Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc. true Boolean camel.component.netty.backlog Allows to configure a backlog for netty consumer (server). Note the backlog is just a best effort depending on the OS. Setting this option to a value such as 200, 500 or 1000, tells the TCP stack how long the accept queue can be If this option is not configured, then the backlog depends on OS setting. Integer camel.component.netty.boss-count When netty works on nio mode, it uses default bossCount parameter from Netty, which is 1. User can use this option to override the default bossCount from Netty. 1 Integer camel.component.netty.boss-group Set the BossGroup which could be used for handling the new connection of the server side across the NettyEndpoint. The option is a io.netty.channel.EventLoopGroup type. EventLoopGroup camel.component.netty.bridge-error-handler Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored. false Boolean camel.component.netty.broadcast Setting to choose Multicast over UDP. false Boolean camel.component.netty.channel-group To use a explicit ChannelGroup. The option is a io.netty.channel.group.ChannelGroup type. ChannelGroup camel.component.netty.client-initializer-factory To use a custom ClientInitializerFactory. The option is a org.apache.camel.component.netty.ClientInitializerFactory type. ClientInitializerFactory camel.component.netty.client-mode If the clientMode is true, netty consumer will connect the address as a TCP client. false Boolean camel.component.netty.configuration To use the NettyConfiguration as configuration when creating endpoints. The option is a org.apache.camel.component.netty.NettyConfiguration type. NettyConfiguration camel.component.netty.connect-timeout Time to wait for a socket connection to be available. Value is in milliseconds. 10000 Integer camel.component.netty.correlation-manager To use a custom correlation manager to manage how request and reply messages are mapped when using request/reply with the netty producer. This should only be used if you have a way to map requests together with replies such as if there is correlation ids in both the request and reply messages. This can be used if you want to multiplex concurrent messages on the same channel (aka connection) in netty. When doing this you must have a way to correlate the request and reply messages so you can store the right reply on the inflight Camel Exchange before its continued routed. We recommend extending the TimeoutCorrelationManagerSupport when you build custom correlation managers. This provides support for timeout and other complexities you otherwise would need to implement as well. See also the producerPoolEnabled option for more details. The option is a org.apache.camel.component.netty.NettyCamelStateCorrelationManager type. NettyCamelStateCorrelationManager camel.component.netty.decoder-max-line-length The max line length to use for the textline codec. 1024 Integer camel.component.netty.decoders A list of decoders to be used. You can use a String which have values separated by comma, and have the values be looked up in the Registry. Just remember to prefix the value with # so Camel knows it should lookup. String camel.component.netty.delimiter The delimiter to use for the textline codec. Possible values are LINE and NULL. TextLineDelimiter camel.component.netty.disconnect Whether or not to disconnect(close) from Netty Channel right after use. Can be used for both consumer and producer. false Boolean camel.component.netty.disconnect-on-no-reply If sync is enabled then this option dictates NettyConsumer if it should disconnect where there is no reply to send back. true Boolean camel.component.netty.enabled Whether to enable auto configuration of the netty component. This is enabled by default. Boolean camel.component.netty.enabled-protocols Which protocols to enable when using SSL. TLSv1,TLSv1.1,TLSv1.2 String camel.component.netty.encoders A list of encoders to be used. You can use a String which have values separated by comma, and have the values be looked up in the Registry. Just remember to prefix the value with # so Camel knows it should lookup. String camel.component.netty.encoding The encoding (a charset name) to use for the textline codec. If not provided, Camel will use the JVM default Charset. String camel.component.netty.executor-service To use the given EventExecutorGroup. The option is a io.netty.util.concurrent.EventExecutorGroup type. EventExecutorGroup camel.component.netty.hostname-verification To enable/disable hostname verification on SSLEngine. false Boolean camel.component.netty.keep-alive Setting to ensure socket is not closed due to inactivity. true Boolean camel.component.netty.key-store-file Client side certificate keystore to be used for encryption. File camel.component.netty.key-store-format Keystore format to be used for payload encryption. Defaults to JKS if not set. String camel.component.netty.key-store-resource Client side certificate keystore to be used for encryption. Is loaded by default from classpath, but you can prefix with classpath:, file:, or http: to load the resource from different systems. String camel.component.netty.lazy-channel-creation Channels can be lazily created to avoid exceptions, if the remote server is not up and running when the Camel producer is started. true Boolean camel.component.netty.lazy-start-producer Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel's routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing. false Boolean camel.component.netty.maximum-pool-size Sets a maximum thread pool size for the netty consumer ordered thread pool. The default size is 2 x cpu_core plus 1. Setting this value to eg 10 will then use 10 threads unless 2 x cpu_core plus 1 is a higher value, which then will override and be used. For example if there are 8 cores, then the consumer thread pool will be 17. This thread pool is used to route messages received from Netty by Camel. We use a separate thread pool to ensure ordering of messages and also in case some messages will block, then nettys worker threads (event loop) wont be affected. Integer camel.component.netty.native-transport Whether to use native transport instead of NIO. Native transport takes advantage of the host operating system and is only supported on some platforms. You need to add the netty JAR for the host operating system you are using. See more details at: . false Boolean camel.component.netty.need-client-auth Configures whether the server needs client authentication when using SSL. false Boolean camel.component.netty.netty-server-bootstrap-factory To use a custom NettyServerBootstrapFactory. The option is a org.apache.camel.component.netty.NettyServerBootstrapFactory type. NettyServerBootstrapFactory camel.component.netty.network-interface When using UDP then this option can be used to specify a network interface by its name, such as eth0 to join a multicast group. String camel.component.netty.no-reply-log-level If sync is enabled this option dictates NettyConsumer which logging level to use when logging a there is no reply to send back. LoggingLevel camel.component.netty.options Allows to configure additional netty options using option. as prefix. For example option.child.keepAlive=false to set the netty option child.keepAlive=false. See the Netty documentation for possible options that can be used. Map camel.component.netty.passphrase Password setting to use in order to encrypt/decrypt payloads sent using SSH. String camel.component.netty.producer-pool-enabled Whether producer pool is enabled or not. Important: If you turn this off then a single shared connection is used for the producer, also if you are doing request/reply. That means there is a potential issue with interleaved responses if replies comes back out-of-order. Therefore you need to have a correlation id in both the request and reply messages so you can properly correlate the replies to the Camel callback that is responsible for continue processing the message in Camel. To do this you need to implement NettyCamelStateCorrelationManager as correlation manager and configure it via the correlationManager option. See also the correlationManager option for more details. true Boolean camel.component.netty.producer-pool-max-idle Sets the cap on the number of idle instances in the pool. 100 Integer camel.component.netty.producer-pool-max-total Sets the cap on the number of objects that can be allocated by the pool (checked out to clients, or idle awaiting checkout) at a given time. Use a negative value for no limit. -1 Integer camel.component.netty.producer-pool-min-evictable-idle Sets the minimum amount of time (value in millis) an object may sit idle in the pool before it is eligible for eviction by the idle object evictor. 300000 Long camel.component.netty.producer-pool-min-idle Sets the minimum number of instances allowed in the producer pool before the evictor thread (if active) spawns new objects. Integer camel.component.netty.receive-buffer-size The TCP/UDP buffer sizes to be used during inbound communication. Size is bytes. 65536 Integer camel.component.netty.receive-buffer-size-predictor Configures the buffer size predictor. See details at Jetty documentation and this mail thread. Integer camel.component.netty.reconnect Used only in clientMode in consumer, the consumer will attempt to reconnect on disconnection if this is enabled. true Boolean camel.component.netty.reconnect-interval Used if reconnect and clientMode is enabled. The interval in milli seconds to attempt reconnection. 10000 Integer camel.component.netty.request-timeout Allows to use a timeout for the Netty producer when calling a remote server. By default no timeout is in use. The value is in milli seconds, so eg 30000 is 30 seconds. The requestTimeout is using Netty's ReadTimeoutHandler to trigger the timeout. Long camel.component.netty.reuse-address Setting to facilitate socket multiplexing. true Boolean camel.component.netty.reuse-channel This option allows producers and consumers (in client mode) to reuse the same Netty Channel for the lifecycle of processing the Exchange. This is useful if you need to call a server multiple times in a Camel route and want to use the same network connection. When using this, the channel is not returned to the connection pool until the Exchange is done; or disconnected if the disconnect option is set to true. The reused Channel is stored on the Exchange as an exchange property with the key NettyConstants#NETTY_CHANNEL which allows you to obtain the channel during routing and use it as well. false Boolean camel.component.netty.security-provider Security provider to be used for payload encryption. Defaults to SunX509 if not set. String camel.component.netty.send-buffer-size The TCP/UDP buffer sizes to be used during outbound communication. Size is bytes. 65536 Integer camel.component.netty.server-closed-channel-exception-caught-log-level If the server (NettyConsumer) catches an java.nio.channels.ClosedChannelException then its logged using this logging level. This is used to avoid logging the closed channel exceptions, as clients can disconnect abruptly and then cause a flood of closed exceptions in the Netty server. LoggingLevel camel.component.netty.server-exception-caught-log-level If the server (NettyConsumer) catches an exception then its logged using this logging level. LoggingLevel camel.component.netty.server-initializer-factory To use a custom ServerInitializerFactory. The option is a org.apache.camel.component.netty.ServerInitializerFactory type. ServerInitializerFactory camel.component.netty.ssl Setting to specify whether SSL encryption is applied to this endpoint. false Boolean camel.component.netty.ssl-client-cert-headers When enabled and in SSL mode, then the Netty consumer will enrich the Camel Message with headers having information about the client certificate such as subject name, issuer name, serial number, and the valid date range. false Boolean camel.component.netty.ssl-context-parameters To configure security using SSLContextParameters. The option is a org.apache.camel.support.jsse.SSLContextParameters type. SSLContextParameters camel.component.netty.ssl-handler Reference to a class that could be used to return an SSL Handler. The option is a io.netty.handler.ssl.SslHandler type. SslHandler camel.component.netty.sync Setting to set endpoint as one-way or request-response. true Boolean camel.component.netty.tcp-no-delay Setting to improve TCP protocol performance. true Boolean camel.component.netty.textline Only used for TCP. If no codec is specified, you can use this flag to indicate a text line based codec; if not specified or the value is false, then Object Serialization is assumed over TCP - however only Strings are allowed to be serialized by default. false Boolean camel.component.netty.transfer-exchange Only used for TCP. You can transfer the exchange over the wire instead of just the body. The following fields are transferred: In body, Out body, fault body, In headers, Out headers, fault headers, exchange properties, exchange exception. This requires that the objects are serializable. Camel will exclude any non-serializable objects and log it at WARN level. false Boolean camel.component.netty.trust-store-file Server side certificate keystore to be used for encryption. File camel.component.netty.trust-store-resource Server side certificate keystore to be used for encryption. Is loaded by default from classpath, but you can prefix with classpath:, file:, or http: to load the resource from different systems. String camel.component.netty.udp-byte-array-codec For UDP only. If enabled the using byte array codec instead of Java serialization protocol. false Boolean camel.component.netty.udp-connectionless-sending This option supports connection less udp sending which is a real fire and forget. A connected udp send receive the PortUnreachableException if no one is listen on the receiving port. false Boolean camel.component.netty.use-byte-buf If the useByteBuf is true, netty producer will turn the message body into ByteBuf before sending it out. false Boolean camel.component.netty.use-global-ssl-context-parameters Enable usage of global SSL context parameters. false Boolean camel.component.netty.using-executor-service Whether to use ordered thread pool, to ensure events are processed orderly on the same channel. true Boolean camel.component.netty.worker-count When netty works on nio mode, it uses default workerCount parameter from Netty (which is cpu_core_threads x 2). User can use this option to override the default workerCount from Netty. Integer camel.component.netty.worker-group To use a explicit EventLoopGroup as the boss thread pool. For example to share a thread pool with multiple consumers or producers. By default each consumer or producer has their own worker pool with 2 x cpu count core threads. The option is a io.netty.channel.EventLoopGroup type. EventLoopGroup

Commands:
<dependency> <groupId>org.apache.camel.springboot</groupId> <artifactId>camel-netty-starter</artifactId> </dependency>
netty:tcp://0.0.0.0:99999[?options] netty:udp://remotehost:99999/[?options]
netty:protocol://host:port
@BindToRegistry("decoder") public ChannelHandler getDecoder() throws Exception { return new DefaultChannelHandlerFactory() { @Override public ChannelHandler newChannelHandler() { return new DatagramPacketObjectDecoder(ClassResolvers.weakCachingResolver(null)); } }; } RouteBuilder builder = new RouteBuilder() { public void configure() { from("netty:udp://0.0.0.0:5155?sync=true&decoders=#decoder") .process(new Processor() { public void process(Exchange exchange) throws Exception { Poetry poetry = (Poetry) exchange.getIn().getBody(); // Process poetry in some way exchange.getOut().setBody("Message received); } } } };
RouteBuilder builder = new RouteBuilder() { public void configure() { from("netty:tcp://0.0.0.0:5150") .to("mock:result"); } };
KeyStoreParameters ksp = new KeyStoreParameters(); ksp.setResource("/users/home/server/keystore.jks"); ksp.setPassword("keystorePassword"); KeyManagersParameters kmp = new KeyManagersParameters(); kmp.setKeyStore(ksp); kmp.setKeyPassword("keyPassword"); SSLContextParameters scp = new SSLContextParameters(); scp.setKeyManagers(kmp); NettyComponent nettyComponent = getContext().getComponent("netty", NettyComponent.class); nettyComponent.setSslContextParameters(scp);
<camel:sslContextParameters id="sslContextParameters"> <camel:keyManagers keyPassword="keyPassword"> <camel:keyStore resource="/users/home/server/keystore.jks" password="keystorePassword"/> </camel:keyManagers> </camel:sslContextParameters> <to uri="netty:tcp://0.0.0.0:5150?sync=true&ssl=true&sslContextParameters=#sslContextParameters"/>
Registry registry = context.getRegistry(); registry.bind("password", "changeit"); registry.bind("ksf", new File("src/test/resources/keystore.jks")); registry.bind("tsf", new File("src/test/resources/keystore.jks")); context.addRoutes(new RouteBuilder() { public void configure() { String netty_ssl_endpoint = "netty:tcp://0.0.0.0:5150?sync=true&ssl=true&passphrase=#password" + "&keyStoreFile=#ksf&trustStoreFile=#tsf"; String return_string = "When You Go Home, Tell Them Of Us And Say," + "For Your Tomorrow, We Gave Our Today."; from(netty_ssl_endpoint) .process(new Processor() { public void process(Exchange exchange) throws Exception { exchange.getOut().setBody(return_string); } } } });
SSLSession session = exchange.getIn().getHeader(NettyConstants.NETTY_SSL_SESSION, SSLSession.class); // get the first certificate which is client certificate javax.security.cert.X509Certificate cert = session.getPeerCertificateChain()[0]; Principal principal = cert.getSubjectDN();
ChannelHandlerFactory lengthDecoder = ChannelHandlerFactories.newLengthFieldBasedFrameDecoder(1048576, 0, 4, 0, 4); StringDecoder stringDecoder = new StringDecoder(); registry.bind("length-decoder", lengthDecoder); registry.bind("string-decoder", stringDecoder); LengthFieldPrepender lengthEncoder = new LengthFieldPrepender(4); StringEncoder stringEncoder = new StringEncoder(); registry.bind("length-encoder", lengthEncoder); registry.bind("string-encoder", stringEncoder); List<ChannelHandler> decoders = new ArrayList<ChannelHandler>(); decoders.add(lengthDecoder); decoders.add(stringDecoder); List<ChannelHandler> encoders = new ArrayList<ChannelHandler>(); encoders.add(lengthEncoder); encoders.add(stringEncoder); registry.bind("encoders", encoders); registry.bind("decoders", decoders);
<util:list id="decoders" list-class="java.util.LinkedList"> <bean class="org.apache.camel.component.netty.ChannelHandlerFactories" factory-method="newLengthFieldBasedFrameDecoder"> <constructor-arg value="1048576"/> <constructor-arg value="0"/> <constructor-arg value="4"/> <constructor-arg value="0"/> <constructor-arg value="4"/> </bean> <bean class="io.netty.handler.codec.string.StringDecoder"/> </util:list> <util:list id="encoders" list-class="java.util.LinkedList"> <bean class="io.netty.handler.codec.LengthFieldPrepender"> <constructor-arg value="4"/> </bean> <bean class="io.netty.handler.codec.string.StringEncoder"/> </util:list> <bean id="length-encoder" class="io.netty.handler.codec.LengthFieldPrepender"> <constructor-arg value="4"/> </bean> <bean id="string-encoder" class="io.netty.handler.codec.string.StringEncoder"/> <bean id="length-decoder" class="org.apache.camel.component.netty.ChannelHandlerFactories" factory-method="newLengthFieldBasedFrameDecoder"> <constructor-arg value="1048576"/> <constructor-arg value="0"/> <constructor-arg value="4"/> <constructor-arg value="0"/> <constructor-arg value="4"/> </bean> <bean id="string-decoder" class="io.netty.handler.codec.string.StringDecoder"/>
from("direct:multiple-codec").to("netty:tcp://0.0.0.0:{{port}}?encoders=#encoders&sync=false"); from("netty:tcp://0.0.0.0:{{port}}?decoders=#length-decoder,#string-decoder&sync=false").to("mock:multiple-codec");
<camelContext id="multiple-netty-codecs-context" xmlns="http://camel.apache.org/schema/spring"> <route> <from uri="direct:multiple-codec"/> <to uri="netty:tcp://0.0.0.0:5150?encoders=#encoders&amp;sync=false"/> </route> <route> <from uri="netty:tcp://0.0.0.0:5150?decoders=#length-decoder,#string-decoder&amp;sync=false"/> <to uri="mock:multiple-codec"/> </route> </camelContext>
from("netty:tcp://0.0.0.0:8080").process(new Processor() { public void process(Exchange exchange) throws Exception { String body = exchange.getIn().getBody(String.class); exchange.getOut().setBody("Bye " + body); // some condition which determines if we should close if (close) { exchange.getOut().setHeader(NettyConstants.NETTY_CLOSE_CHANNEL_WHEN_COMPLETE, true); } } });
public class SampleServerInitializerFactory extends ServerInitializerFactory { private int maxLineSize = 1024; protected void initChannel(Channel ch) throws Exception { ChannelPipeline channelPipeline = ch.pipeline(); channelPipeline.addLast("encoder-SD", new StringEncoder(CharsetUtil.UTF_8)); channelPipeline.addLast("decoder-DELIM", new DelimiterBasedFrameDecoder(maxLineSize, true, Delimiters.lineDelimiter())); channelPipeline.addLast("decoder-SD", new StringDecoder(CharsetUtil.UTF_8)); // here we add the default Camel ServerChannelHandler for the consumer, to allow Camel to route the message etc. channelPipeline.addLast("handler", new ServerChannelHandler(consumer)); } }
Registry registry = camelContext.getRegistry(); ServerInitializerFactory factory = new TestServerInitializerFactory(); registry.bind("spf", factory); context.addRoutes(new RouteBuilder() { public void configure() { String netty_ssl_endpoint = "netty:tcp://0.0.0.0:5150?serverInitializerFactory=#spf" String return_string = "When You Go Home, Tell Them Of Us And Say," + "For Your Tomorrow, We Gave Our Today."; from(netty_ssl_endpoint) .process(new Processor() { public void process(Exchange exchange) throws Exception { exchange.getOut().setBody(return_string); } } } });
<!-- use the worker pool builder to help create the shared thread pool --> <bean id="poolBuilder" class="org.apache.camel.component.netty.NettyWorkerPoolBuilder"> <property name="workerCount" value="2"/> </bean> <!-- the shared worker thread pool --> <bean id="sharedPool" class="org.jboss.netty.channel.socket.nio.WorkerPool" factory-bean="poolBuilder" factory-method="build" destroy-method="shutdown"> </bean>
<route> <from uri="netty:tcp://0.0.0.0:5021?textline=true&amp;sync=true&amp;workerPool=#sharedPool&amp;usingExecutorService=false"/> <to uri="log:result"/> </route>
<route> <from uri="netty:tcp://0.0.0.0:5022?textline=true&amp;sync=true&amp;workerPool=#sharedPool&amp;usingExecutorService=false"/> <to uri="log:result"/> </route>