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Chapter 8. Atom
Atom Component
The atom: component is used for polling atom feeds.
Apache Camel will poll the feed every 500 milliseconds by default. Note: The component currently supports only 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 Apache Camel will poll the feed and for the subsequent polls return each entry poll by poll. If the feed contains 7 entries then Apache Camel will return the first entry on the first poll, the 2nd entry on the next poll, until no more entries where as Apache Camel will do a new update on the feed. If false then Apache Camel will poll a fresh feed on every invocation.
|
filter
|
true
|
Is only used by the split entries to filter the entries to return. Apache 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 .
|
throttleEntries
|
true
|
Camel 2.5: 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 is set to true .
|
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
|
500
|
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
Apache Camel will set the In body on the returned
Exchange
with the entries. Depending on the splitEntries
flag Apache 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>)
|
Apache Camel can set the
Feed
object on the in header (see feedHeader
option to disable this):
Message Headers
Apache Camel atom uses these headers.
Header | Description |
---|---|
CamelAtomFeed
|
Apache Camel 2.0: When consuming the org.apache.abdera.model.Feed object is set to this header.
|
Samples
In the following 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 set up Apache Camel standalone, not running in any container or using Spring.
@Override protected CamelContext createCamelContext() throws Exception { // First we register a blog service in our bean registry SimpleRegistry registry = new SimpleRegistry(); registry.put("blogService", new BlogService()); // Then we create the camel context with our bean registry context = new DefaultCamelContext(registry); // Then we add all the routes we need using the route builder DSL syntax context.addRoutes(createMyRoutes()); // And finally we must start Camel to let the magic routing begins context.start(); return context; } /** * This is the route builder where we create our routes using the Camel DSL syntax */ protected RouteBuilder createMyRoutes() 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. // 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 Strachan 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 { // create and start Camel context = createCamelContext(); context.start(); // Get the mock endpoint MockEndpoint mock = context.getEndpoint("mock:result", MockEndpoint.class); // There should be at least two good blog entries from the feed mock.expectedMinimumMessageCount(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(); // stop Camel after use context.stop(); } /** * 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; } }