Atom

Page edited by willem jiang

Atom Component

The atom: component is used for polling atom feeds.

Camel will default poll the feed every 60th seconds.
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>

URI format

atom://atomUri[?options]

Where atomUri is the URI to the atom feed to poll.

Options

Property	Default	Description
`splitEntries`	`true`	If `true` Camel will poll the feed and for the subsequent polls return each entry poll by poll. If the feed contains 7 entries then Camel will return the first entry on the first poll, the 2nd entry on the next poll, until no more entries where as Camel will do a new update on the feed. If `false` then Camel will poll a fresh feed on every invocation.
`filter`	`true`	Is only used by the split entries to filter the entries to return. Camel will default use the `UpdateDateFilter` that only return new entries from the feed. So the client consuming from the feed never receives the same entry more than once. The filter will return the entries ordered by the newest last.
`lastUpdate`	`null`	Is only used by the filter, as the starting timestamp for selection never entries (uses the `entry.updated` timestamp). Syntax format is: `yyyy-MM-ddTHH:MM:ss`. Example: `2007-12-24T17:45:59`.
`feedHeader`	`true`	Sets whether to add the Abdera Feed object as a header.
`sortEntries`	`false`	If `splitEntries` is `true`, this sets whether to sort those entries by updated date.
`consumer.delay`	`60000`	Delay in millis between each poll.
`consumer.initialDelay`	`1000`	Millis before polling starts.
`consumer.userFixedDelay`	`false`	If `true`, use fixed delay between pools, otherwise fixed rate is used. See ScheduledExecutorService in JDK for details.

You can append query options to the URI in the following format, ?option=value&option=value&...

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):

Message Headers

Camel atom uses these headers.

Header	Description
`org.apache.camel.component.atom.feed`	Camel 1.x: When consuming the `org.apache.abdera.model.Feed` object is set to this header.
`CamelAtomFeed`	Camel 2.0: When consuming the `org.apache.abdera.model.Feed` object is set to this header.

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.

// This is the CamelContext that is the heart of Camel
private CamelContext context;

// We use a simple Hashtable for our bean registry. For more advanced usage Spring is supported out-of-the-box
private Hashtable beans = new Hashtable();

// We initialize Camel
private void setupCamel() throws Exception {
    // First we register a blog service in our bean registry
    beans.put("blogService", new BlogService());

    // Then we create the camel context with our bean registry
    context = new DefaultCamelContext(new CamelInitialContextFactory().getInitialContext(beans));

    // Then we add all the routes we need using the route builder DSL syntax
    context.addRoutes(createRouteBuilder());

    // And finally we must start Camel to let the magic routing begins
    context.start();
}

/**
 * This is the route builder where we create our routes in the advanced Camel DSL syntax
 */
protected RouteBuilder createRouteBuilder() throws Exception {
    return new RouteBuilder() {
        public void configure() throws Exception {
            // We pool the atom feeds from the source for further processing in the seda queue
            // we set the delay to 1 second for each pool as this is a unit test also and we can
            // not wait the default poll interval of 60 seconds.
            // Using splitEntries=true will during polling only fetch one Atom Entry at any given time.
            // As the feed.atom file contains 7 entries, using this will require 7 polls to fetch the entire
            // content. When Camel have reach the end of entries it will refresh the atom feed from URI source
            // and restart - but as Camel by default uses the UpdatedDateFilter it will only deliver new
            // blog entries to "seda:feeds". So only when James Straham updates his blog with a new entry
            // Camel will create an exchange for the seda:feeds.
            from("atom:file:src/test/data/feed.atom?splitEntries=true&consumer.delay=1000").to("seda:feeds");

            // From the feeds we filter each blot entry by using our blog service class
            from("seda:feeds").filter().method("blogService", "isGoodBlog").to("seda:goodBlogs");

            // And the good blogs is moved to a mock queue as this sample is also used for unit testing
            // this is one of the strengths in Camel that you can also use the mock endpoint for your
            // unit tests
            from("seda:goodBlogs").to("mock:result");
        }
    };
}

/**
 * This is the actual junit test method that does the assertion that our routes is working
 * as expected
 */
@Test
public void testFiltering() throws Exception {
    // Get the mock endpoint
    MockEndpoint mock = context.getEndpoint("mock:result", MockEndpoint.class);

    // There should be two good blog entries from the feed
    mock.expectedMessageCount(2);

    // Asserts that the above expectations is true, will throw assertions exception if it failed
    // Camel will default wait max 20 seconds for the assertions to be true, if the conditions
    // is true sooner Camel will continue
    mock.assertIsSatisfied();
}

/**
 * Services for blogs
 */
public class BlogService {

    /**
     * Tests the blogs if its a good blog entry or not
     */
    public boolean isGoodBlog(Exchange exchange) {
        Entry entry = exchange.getIn().getBody(Entry.class);
        String title = entry.getTitle();            

        // We like blogs about Camel
        boolean good = title.toLowerCase().contains("camel");
        return good;
    }

}