Chapter 13. Atom Component Available as of Camel version 1.2 The atom: component is used for polling Atom feeds. Camel will poll the feed every 60 seconds by default. Note: The component currently only supports polling (consuming) feeds. Maven users will need to add the following dependency to their pom.xml for this component: <dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-atom</artifactId> <version>x.x.x</version> <!-- use the same version as your Camel core version --> </dependency> 13.1. URI format atom://atomUri[?options] Where atomUri is the URI to the Atom feed to poll. 13.2. Options The Atom component has no options. The Atom endpoint is configured using URI syntax: with the following path and query parameters: 13.2.1. Path Parameters (1 parameters): Name Description Default Type feedUri Required The URI to the feed to poll. String 13.2.2. Query Parameters (27 parameters): Name Description Default Type 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 feedHeader (consumer) Sets whether to add the feed object as a header true boolean filter (consumer) Sets whether to use filtering or not of the entries. true boolean lastUpdate (consumer) Sets the timestamp to be used for filtering entries from the atom feeds. This options is only in conjunction with the splitEntries. Date password (consumer) Sets the password to be used for basic authentication when polling from a HTTP feed String 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 sortEntries (consumer) Sets whether to sort entries by published date. Only works when splitEntries = true. false boolean splitEntries (consumer) Sets whether or not entries should be sent individually or whether the entire feed should be sent as a single message true boolean throttleEntries (consumer) Sets whether all entries identified in a single feed poll should be delivered immediately. If true, only one entry is processed per consumer.delay. Only applicable when splitEntries = true. true boolean username (consumer) Sets the username to be used for basic authentication when polling from a HTTP feed String exceptionHandler (consumer) 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) Sets the exchange pattern when the consumer creates an exchange. ExchangePattern pollStrategy (consumer) 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. PollingConsumerPoll Strategy synchronous (advanced) Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported). false boolean 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. You can also specify time values using units, such as 60s (60 seconds), 5m30s (5 minutes and 30 seconds), and 1h (1 hour). 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. You can also specify time values using units, such as 60s (60 seconds), 5m30s (5 minutes and 30 seconds), and 1h (1 hour). 1000 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. 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. ScheduledExecutor Service scheduler (scheduler) To use a cron scheduler from either camel-spring or camel-quartz2 component none ScheduledPollConsumer Scheduler schedulerProperties (scheduler) To configure additional properties when using a custom scheduler or any of the Quartz2, Spring based scheduler. Map startScheduler (scheduler) Whether the scheduler should be auto started. true boolean timeUnit (scheduler) Time unit for initialDelay and delay options. MILLISECONDS TimeUnit useFixedDelay (scheduler) Controls if fixed delay or fixed rate is used. See ScheduledExecutorService in JDK for details. true boolean 13.3. Spring Boot Auto-Configuration The component supports 2 options, which are listed below. Name Description Default Type camel.component.atom.enabled Enable atom component true Boolean camel.component.atom.resolve-property-placeholders Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders. true Boolean You can append query options to the URI in the following format, ?option=value&option=value&... 13.4. Exchange data format Camel will set the In body on the returned Exchange with the entries. Depending on the splitEntries flag Camel will either return one Entry or a List<Entry> . Option Value Behavior splitEntries true Only a single entry from the currently being processed feed is set: exchange.in.body(Entry) splitEntries false The entire list of entries from the feed is set: exchange.in.body(List<Entry>) Camel can set the Feed object on the In header (see feedHeader option to disable this): 13.5. Message Headers Camel atom uses these headers. Header Description CamelAtomFeed When consuming the org.apache.abdera.model.Feed object is set to this header. 13.6. Samples In this sample we poll James Strachan's blog. from("atom://http://macstrac.blogspot.com/feeds/posts/default").to("seda:feeds"); In this sample we want to filter only good blogs we like to a SEDA queue. The sample also shows how to setup Camel standalone, not running in any Container or using Spring. 13.7. See Also Configuring Camel Component Endpoint Getting Started RSS

Commands:
<dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-atom</artifactId> <version>x.x.x</version> <!-- use the same version as your Camel core version --> </dependency>
atom://atomUri[?options]
atom:feedUri
from("atom://http://macstrac.blogspot.com/feeds/posts/default").to("seda:feeds");