Chapter 105. Olingo4 Since Camel 2.19 Both producer and consumer are supported The Olingo4 component uses Apache Olingo version 4.0 APIs to interact with OData 4.0 compliant service. Since version 4.0, OData is an OASIS standard and a number of popular open source and commercial vendors and products support this protocol. A sample list of supporting products can be found on the OData website . The Olingo4 component supports reading entity sets, entities, simple and complex properties, counts, using custom and OData system query parameters. It supports updating entities and properties. It also supports submitting queries and change requests as a single OData batch operation. The component supports configuring HTTP connection parameters and headers for OData service connection. This allows configuring use of SSL, OAuth2.0, etc. as required by the target OData service. 105.1. Dependencies When using camel-olingo4 with Red Hat build of Camel Spring Boot, add the following Maven dependency to your pom.xml to have support for auto configuration: <dependency> <groupId>org.apache.camel.springboot</groupId> <artifactId>camel-olingo4-starter</artifactId> </dependency> 105.2. URI format 105.3. Configuring Options Camel components are configured on two separate levels: component level endpoint level 105.3.1. 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. 105.3.2. 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. 105.4. Component Options The Olingo4 component supports 16 options, which are listed below. Name Description Default Type configuration (common) To use the shared configuration. Olingo4Configuration connectTimeout (common) HTTP connection creation timeout in milliseconds, defaults to 30,000 (30 seconds). 30000 int contentType (common) Content-Type header value can be used to specify JSON or XML message format, defaults to application/json;charset=utf-8. application/json;charset=utf-8 String filterAlreadySeen (common) Set this to true to filter out results that have already been communicated by this component. false boolean httpHeaders (common) Custom HTTP headers to inject into every request, this could include OAuth tokens, etc. Map proxy (common) HTTP proxy server configuration. HttpHost serviceUri (common) Target OData service base URI, for example, http://services.odata.org/OData/OData.svc . String socketTimeout (common) HTTP request timeout in milliseconds, defaults to 30,000 (30 seconds). 30000 int bridgeErrorHandler (consumer) Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions (if possible) occurred while the Camel consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. Important: This is only possible if the 3rd party component allows Camel to be alerted if an exception was thrown. Some components handle this internally only, and therefore bridgeErrorHandler is not possible. In other situations we may improve the Camel component to hook into the 3rd party component and make this possible for future releases. 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 splitResult (consumer) For endpoints that return an array or collection, a consumer endpoint will map every element to distinct messages, unless splitResult is set to false. true boolean 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 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 httpAsyncClientBuilder (advanced) Custom HTTP async client builder for more complex HTTP client configuration, overrides connectionTimeout, socketTimeout, proxy and sslContext. Note that a socketTimeout MUST be specified in the builder, otherwise OData requests could block indefinitely. HttpAsyncClientBuilder httpClientBuilder (advanced) Custom HTTP client builder for more complex HTTP client configuration, overrides connectionTimeout, socketTimeout, proxy and sslContext. Note that a socketTimeout MUST be specified in the builder, otherwise OData requests could block indefinitely. HttpClientBuilder sslContextParameters (security) To configure security using SSLContextParameters. SSLContextParameters useGlobalSslContextParameters (security) Enable usage of global SSL context parameters. false boolean 105.5. Endpoint Options The Olingo4 endpoint is configured using URI syntax: With the following path and query parameters: 105.5.1. Path Parameters (2 parameters) Name Description Default Type apiName (common) Required What kind of operation to perform. Enum values: DEFAULT Olingo4ApiName methodName (common) Required What sub operation to use for the selected operation. String 105.5.2. Query Parameters (32 parameters) Name Description Default Type connectTimeout (common) HTTP connection creation timeout in milliseconds, defaults to 30,000 (30 seconds). 30000 int contentType (common) Content-Type header value can be used to specify JSON or XML message format, defaults to application/json;charset=utf-8. application/json;charset=utf-8 String filterAlreadySeen (common) Set this to true to filter out results that have already been communicated by this component. false boolean httpHeaders (common) Custom HTTP headers to inject into every request, this could include OAuth tokens, etc. Map inBody (common) Sets the name of a parameter to be passed in the exchange In Body. String proxy (common) HTTP proxy server configuration. HttpHost serviceUri (common) Target OData service base URI, for example, http://services.odata.org/OData/OData.svc . String socketTimeout (common) HTTP request timeout in milliseconds, defaults to 30,000 (30 seconds). 30000 int sendEmptyMessageWhenIdle (consumer) If the polling consumer did not poll any files, you can enable this option to send an empty message (no body) instead. false boolean splitResult (consumer) For endpoints that return an array or collection, a consumer endpoint will map every element to distinct messages, unless splitResult is set to false. true boolean bridgeErrorHandler (consumer (advanced)) Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions (if possible) occurred while the Camel consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. Important: This is only possible if the 3rd party component allows Camel to be alerted if an exception was thrown. Some components handle this internally only, and therefore bridgeErrorHandler is not possible. In other situations we may improve the Camel component to hook into the 3rd party component and make this possible for future releases. 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 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 ExchangePattern pollStrategy (consumer (advanced)) A pluggable org.apache.camel.PollingConsumerPollingStrategy allowing you to provide your custom implementation to control error handling usually occurred during the poll operation before an Exchange have been created and being routed in Camel. PollingConsumerPollStrategy lazyStartProducer (producer (advanced)) 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 httpAsyncClientBuilder (advanced) Custom HTTP async client builder for more complex HTTP client configuration, overrides connectionTimeout, socketTimeout, proxy and sslContext. Note that a socketTimeout MUST be specified in the builder, otherwise OData requests could block indefinitely. HttpAsyncClientBuilder httpClientBuilder (advanced) Custom HTTP client builder for more complex HTTP client configuration, overrides connectionTimeout, socketTimeout, proxy and sslContext. Note that a socketTimeout MUST be specified in the builder, otherwise OData requests could block indefinitely. HttpClientBuilder backoffErrorThreshold (scheduler) The number of subsequent error polls (failed due some error) that should happen before the backoffMultipler should kick-in. int backoffIdleThreshold (scheduler) The number of subsequent idle polls that should happen before the backoffMultipler should kick-in. int backoffMultiplier (scheduler) To let the scheduled polling consumer backoff if there has been a number of subsequent idles/errors in a row. The multiplier is then the number of polls that will be skipped before the actual attempt is happening again. When this option is in use then backoffIdleThreshold and/or backoffErrorThreshold must also be configured. int delay (scheduler) Milliseconds before the poll. 500 long greedy (scheduler) If greedy is enabled, then the ScheduledPollConsumer will run immediately again, if the run polled 1 or more messages. false boolean initialDelay (scheduler) Milliseconds before the first poll starts. 1000 long repeatCount (scheduler) Specifies a maximum limit of number of fires. So if you set it to 1, the scheduler will only fire once. If you set it to 5, it will only fire five times. A value of zero or negative means fire forever. 0 long runLoggingLevel (scheduler) The consumer logs a start/complete log line when it polls. This option allows you to configure the logging level for that. Enum values: TRACE DEBUG INFO WARN ERROR OFF TRACE LoggingLevel scheduledExecutorService (scheduler) Allows for configuring a custom/shared thread pool to use for the consumer. By default each consumer has its own single threaded thread pool. ScheduledExecutorService scheduler (scheduler) To use a cron scheduler from either camel-spring or camel-quartz component. Use value spring or quartz for built in scheduler. none Object schedulerProperties (scheduler) To configure additional properties when using a custom scheduler or any of the Quartz, Spring based scheduler. Map startScheduler (scheduler) Whether the scheduler should be auto started. true boolean timeUnit (scheduler) Time unit for initialDelay and delay options. Enum values: NANOSECONDS MICROSECONDS MILLISECONDS SECONDS MINUTES HOURS DAYS MILLISECONDS TimeUnit useFixedDelay (scheduler) Controls if fixed delay or fixed rate is used. See ScheduledExecutorService in JDK for details. true boolean sslContextParameters (security) To configure security using SSLContextParameters. SSLContextParameters 105.6. API Parameters (1 APIs) The Olingo4 endpoint is an API-based component and has additional parameters based on which API name and API method is used. The API name and API method is located in the endpoint URI as the apiName/methodName path parameters: There are 1 API names as listed in the table below: API Name Type Description API:DEFAULT Both Olingo4 Client Api Interface Each API is documented in the following sections to come. 105.6.1. API: DEFAULT Both producer and consumer are supported The DEFAULT API is defined in the syntax as follows: olingo4:DEFAULT/methodName?[parameters] The 9 method(s) is(are) listed in the table below, followed by detailed syntax for each method. (API methods can have a shorthand alias name which can be used in the syntax instead of the name) Method Alias Description action Calls a OData action batch Executes a batch request create Creates a new OData resource delete Deletes an OData resource and invokes callback with org merge Patches/merges an OData resource using HTTP MERGE patch Patches/merges an OData resource using HTTP PATCH read Reads an OData resource and invokes callback with appropriate result update Updates an OData resource uread Reads an OData resource and invokes callback with the unparsed input stream 105.6.1.1. Method action Signatures: void action(org.apache.olingo.commons.api.edm.Edm edm, String resourcePath, java.util.Map<String, String> endpointHttpHeaders, Object data, org.apache.camel.component.olingo4.api.Olingo4ResponseHandler responseHandler); The olingo4/action API method has the parameters listed in the table below: Parameter Description Type data Action data Object edm Service Edm Edm endpointHttpHeaders HTTP Headers to add/override the component versions Map resourcePath Resource path to action String responseHandler Org.apache.olingo.client.api.domain.ClientEntity callback handler Olingo4ResponseHandler 105.6.1.2. Method batch Signatures: void batch(org.apache.olingo.commons.api.edm.Edm edm, java.util.Map<String, String> endpointHttpHeaders, Object data, org.apache.camel.component.olingo4.api.Olingo4ResponseHandler<java.util.List<org.apache.camel.component.olingo4.api.batch.Olingo4BatchResponse>> responseHandler); The olingo4/batch API method has the parameters listed in the table below: Parameter Description Type data Ordered org.apache.camel.component.olingo4.api.batch.Olingo4BatchRequest list Object edm Service Edm Edm endpointHttpHeaders HTTP Headers to add/override the component versions Map responseHandler Callback handler Olingo4ResponseHandler 105.6.1.3. Method create Signatures: void create(org.apache.olingo.commons.api.edm.Edm edm, String resourcePath, java.util.Map<String, String> endpointHttpHeaders, Object data, org.apache.camel.component.olingo4.api.Olingo4ResponseHandler responseHandler); The olingo4/create API method has the parameters listed in the table below: Parameter Description Type data Request data Object edm Service Edm Edm endpointHttpHeaders HTTP Headers to add/override the component versions Map resourcePath Resource path to create String responseHandler Callback handler Olingo4ResponseHandler 105.6.1.4. Method delete Signatures: void delete(String resourcePath, java.util.Map<String, String> endpointHttpHeaders, org.apache.camel.component.olingo4.api.Olingo4ResponseHandler<org.apache.olingo.commons.api.http.HttpStatusCode> responseHandler); The olingo4/delete API method has the parameters listed in the table below: Parameter Description Type endpointHttpHeaders HTTP Headers to add/override the component versions Map resourcePath Resource path for Entry String responseHandler Org.apache.olingo.commons.api.http.HttpStatusCode callback handler Olingo4ResponseHandler 105.6.1.5. Method merge Signatures: void merge(org.apache.olingo.commons.api.edm.Edm edm, String resourcePath, java.util.Map<String, String> endpointHttpHeaders, Object data, org.apache.camel.component.olingo4.api.Olingo4ResponseHandler responseHandler); The olingo4/merge API method has the parameters listed in the table below: Parameter Description Type data Patch/merge data Object edm Service Edm Edm endpointHttpHeaders HTTP Headers to add/override the component versions Map resourcePath Resource path to update String responseHandler Org.apache.olingo.client.api.domain.ClientEntity callback handler Olingo4ResponseHandler 105.6.1.6. Method patch Signatures: void patch(org.apache.olingo.commons.api.edm.Edm edm, String resourcePath, java.util.Map<String, String> endpointHttpHeaders, Object data, org.apache.camel.component.olingo4.api.Olingo4ResponseHandler responseHandler); The olingo4/patch API method has the parameters listed in the table below: Parameter Description Type data Patch/merge data Object edm Service Edm Edm endpointHttpHeaders HTTP Headers to add/override the component versions Map resourcePath Resource path to update String responseHandler Org.apache.olingo.client.api.domain.ClientEntity callback handler Olingo4ResponseHandler 105.6.1.7. Method read Signatures: void read(org.apache.olingo.commons.api.edm.Edm edm, String resourcePath, java.util.Map<String, String> queryParams, java.util.Map<String, String> endpointHttpHeaders, org.apache.camel.component.olingo4.api.Olingo4ResponseHandler responseHandler); The olingo4/read API method has the parameters listed in the table below: Parameter Description Type edm Service Edm, read from calling read(null, USDmetdata, null, responseHandler) Edm endpointHttpHeaders HTTP Headers to add/override the component versions Map queryParams OData query params http://docs.oasis-open.org/odata/odata/v4.0/odata-v4.0-part1-protocol.html#_Toc453752288 Map resourcePath OData Resource path String responseHandler Callback handler Olingo4ResponseHandler 105.6.1.8. Method update Signatures: void update(org.apache.olingo.commons.api.edm.Edm edm, String resourcePath, java.util.Map<String, String> endpointHttpHeaders, Object data, org.apache.camel.component.olingo4.api.Olingo4ResponseHandler responseHandler); The olingo4/update API method has the parameters listed in the table below: Parameter Description Type data Updated data Object edm Service Edm Edm endpointHttpHeaders HTTP Headers to add/override the component versions Map resourcePath Resource path to update String responseHandler Org.apache.olingo.client.api.domain.ClientEntity callback handler Olingo4ResponseHandler 105.6.1.9. Method uread Signatures: void uread(org.apache.olingo.commons.api.edm.Edm edm, String resourcePath, java.util.Map<String, String> queryParams, java.util.Map<String, String> endpointHttpHeaders, org.apache.camel.component.olingo4.api.Olingo4ResponseHandler<java.io.InputStream> responseHandler); The olingo4/uread API method has the parameters listed in the table below: Parameter Description Type edm Service Edm, read from calling read(null, USDmetdata, null, responseHandler) Edm endpointHttpHeaders HTTP Headers to add/override the component versions Map queryParams OData query params http://docs.oasis-open.org/odata/odata/v4.0/odata-v4.0-part1-protocol.html#_Toc453752288 Map resourcePath OData Resource path String responseHandler Callback handler Olingo4ResponseHandler In addition to the parameters above, the olingo4 API can also use any of the Query Parameters listed above. Any of the parameters can be provided in either the endpoint URI, or dynamically in a message header. The message header name must be of the format CamelOlingo4.parameter . The inBody parameter overrides message header, i.e., the endpoint parameter inBody=myParameterNameHere would override a CamelOlingo4.myParameterNameHere header. 105.7. Message Headers The Olingo4 component supports 1 message header(s), which is/are listed below: Name Description Default Type CamelOlingo4.responseHttpHeaders (producer) Constant: FULL_RESPONSE_HTTP_HEADERS The response Http headers. Map 105.8. Endpoint HTTP Headers The component level configuration property httpHeaders supplies static HTTP header information. However, some systems require dynamic header information to be passed to and received from the endpoint. A sample use case would be systems that require dynamic security tokens. The endpointHttpHeaders and responseHttpHeaders endpoint properties provide this capability. Set headers that need to be passed to the endpoint in the CamelOlingo4.endpointHttpHeaders property and the response headers will be returned in a CamelOlingo4.responseHttpHeaders property. Both properties are of the type java.util.Map<String, String> . 105.9. OData Resource Type Mapping The result of read endpoint and data type of data option depends on the OData resource being queried, created or modified. OData Resource Type Resource URI from resourcePath and keyPredicate In or Out Body Type Entity data model USDmetadata org.apache.olingo.commons.api.edm.Edm Service document / org.apache.olingo.client.api.domain.ClientServiceDocument OData entity set <entity-set> org.apache.olingo.client.api.domain.ClientEntitySet OData entity <entity-set>(<key-predicate>) org.apache.olingo.client.api.domain.ClientEntity for Out body (response) java.util.Map<String, Object> for In body (request) Simple property <entity-set>(<key-predicate>)/<simple-property> org.apache.olingo.client.api.domain.ClientPrimitiveValue Simple property value <entity-set>(<key-predicate>)/<simple-property>/USDvalue org.apache.olingo.client.api.domain.ClientPrimitiveValue Complex property <entity-set>(<key-predicate>)/<complex-property> org.apache.olingo.client.api.domain.ClientComplexValue Count <resource-uri>/USDcount java.lang.Long 105.10. Samples The following route reads top 5 entries from the People entity ordered by ascending FirstName property. from("direct:...") .setHeader("CamelOlingo4.USDtop", "5"); .to("olingo4://read/People?orderBy=FirstName%20asc"); The following route reads Airports entity using the key property value in incoming id header. from("direct:...") .setHeader("CamelOlingo4.keyPredicate", header("id")) .to("olingo4://read/Airports"); The following route creates People entity using the ClientEntity in body message. from("direct:...") .to("olingo4://create/People"); The following route calls an odata action using the ClientEntity in the body message. The body message may be null for actions that do not expect an input. from("direct:...") .to("olingo4://action/People"); 105.11. Spring Boot Auto-Configuration The component supports 17 options, which are listed below. Name Description Default Type camel.component.olingo4.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.olingo4.bridge-error-handler Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions (if possible) occurred while the Camel consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. Important: This is only possible if the 3rd party component allows Camel to be alerted if an exception was thrown. Some components handle this internally only, and therefore bridgeErrorHandler is not possible. In other situations we may improve the Camel component to hook into the 3rd party component and make this possible for future releases. 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.olingo4.configuration To use the shared configuration. The option is a org.apache.camel.component.olingo4.Olingo4Configuration type. Olingo4Configuration camel.component.olingo4.connect-timeout HTTP connection creation timeout in milliseconds, defaults to 30,000 (30 seconds). 30000 Integer camel.component.olingo4.content-type Content-Type header value can be used to specify JSON or XML message format, defaults to application/json;charset=utf-8. application/json;charset=utf-8 String camel.component.olingo4.enabled Whether to enable auto configuration of the olingo4 component. This is enabled by default. Boolean camel.component.olingo4.filter-already-seen Set this to true to filter out results that have already been communicated by this component. false Boolean camel.component.olingo4.http-async-client-builder Custom HTTP async client builder for more complex HTTP client configuration, overrides connectionTimeout, socketTimeout, proxy and sslContext. Note that a socketTimeout MUST be specified in the builder, otherwise OData requests could block indefinitely. The option is a org.apache.http.impl.nio.client.HttpAsyncClientBuilder type. HttpAsyncClientBuilder camel.component.olingo4.http-client-builder Custom HTTP client builder for more complex HTTP client configuration, overrides connectionTimeout, socketTimeout, proxy and sslContext. Note that a socketTimeout MUST be specified in the builder, otherwise OData requests could block indefinitely. The option is a org.apache.http.impl.client.HttpClientBuilder type. HttpClientBuilder camel.component.olingo4.http-headers Custom HTTP headers to inject into every request, this could include OAuth tokens, etc. Map camel.component.olingo4.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.olingo4.proxy HTTP proxy server configuration. The option is a org.apache.http.HttpHost type. HttpHost camel.component.olingo4.service-uri Target OData service base URI, e.g. . String camel.component.olingo4.socket-timeout HTTP request timeout in milliseconds, defaults to 30,000 (30 seconds). 30000 Integer camel.component.olingo4.split-result For endpoints that return an array or collection, a consumer endpoint will map every element to distinct messages, unless splitResult is set to false. true Boolean camel.component.olingo4.ssl-context-parameters To configure security using SSLContextParameters. The option is a org.apache.camel.support.jsse.SSLContextParameters type. SSLContextParameters camel.component.olingo4.use-global-ssl-context-parameters Enable usage of global SSL context parameters. false Boolean

Commands:
<dependency> <groupId>org.apache.camel.springboot</groupId> <artifactId>camel-olingo4-starter</artifactId> </dependency>
olingo4://endpoint/<resource-path>?[options]
olingo4:apiName/methodName
olingo4:apiName/methodName
olingo4:DEFAULT/methodName?[parameters]
from("direct:...") .setHeader("CamelOlingo4.USDtop", "5"); .to("olingo4://read/People?orderBy=FirstName%20asc");
from("direct:...") .setHeader("CamelOlingo4.keyPredicate", header("id")) .to("olingo4://read/Airports");
from("direct:...") .to("olingo4://create/People");
from("direct:...") .to("olingo4://action/People");