Atom Component

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:

URI format

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.

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

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

CamelAtomFeed

When consuming the org.apache.abdera.model.Feed object is set to this header.

Samples

In this sample we poll James Strachan's blog.

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.

See Also

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