The rss: component is used for polling RSS feeds. Camel will default poll the feed every 60th seconds.
Maven users will need to add the following dependency to their
pom.xml for this component:
<!-- use the same version as your Camel core version -->
Note: The component currently only supports polling (consuming) feeds.
rssUri is the URI to the RSS feed to poll.
You can append query options to the URI in the following format,
true, Camel splits a feed into its individual entries and returns each entry, poll by poll. For example, if a feed contains seven entries, Camel returns the first entry on the first poll, the second entry on the second poll, and so on. When no more entries are left in the feed, Camel contacts the remote RSS URI to obtain a new feed. If
false, Camel obtains a fresh feed on every poll and returns all of the feed's entries.
Use in combination with the
splitEntries option in order to filter returned entries. By default, Camel applies the
UpdateDateFilter filter, which returns only new entries from the feed, ensuring that the consumer endpoint never receives an entry more than once. The filter orders the entries chronologically, with the newest returned last.
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.
Use in combination with the
filter option to block entries earlier than a specific date/time (uses the
entry.updated timestamp). The format is:
Specifies whether to add the ROME
SyndFeed object as a header.
true, this specifies whether to sort the entries by updated date.
Delay in milliseconds between each poll.
Milliseconds before polling starts.
true to use fixed delay between pools, otherwise fixed rate is used. See ScheduledExecutorService in JDK for details.
Camel initializes the In body on the Exchange with a ROME
SyndFeed. Depending on the value of the
splitEntries flag, Camel returns either a
SyndFeed with one
SyndEntry or a
A single entry from the current feed is set in the exchange.
The entire list of entries from the current feed is set in the exchange.
The RSS component ships with an RSS dataformat that can be used to convert between String (as XML) and ROME RSS model objects.
- marshal = from ROME
SyndFeed to XML
- unmarshal = from XML
String to ROME
A route using this would look something like this:
The purpose of this feature is to make it possible to use Camel's lovely built-in expressions for manipulating RSS messages. As shown below, an XPath expression can be used to filter the RSS message:
You can filter out entries quite easily using XPath, as shown in the data format section above. You can also exploit Camel's Bean Integration to implement your own conditions. For instance, a filter equivalent to the XPath example above would be:
The custom bean for this would be: