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Chapter 57. JCR

JCR Component
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The jcr component allows you to add/read nodes to/from a JCR compliant content repository (for example, Apache Jackrabbit) with its producer, or register an EventListener with the consumer.
Maven users will need to add the following dependency to their pom.xml for this component: 
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-jcr</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>
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URI format
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jcr://user:password@repository/path/to/node
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Consumer added
From Camel 2.10 onwards you can use consumer as an EventListener in JCR or a producer to read a node by identifier.

Usage
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The repository element of the URI is used to look up the JCR Repository object in the Camel context registry.

Producer
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Expand
Name Default Value Description
CamelJcrOperation CamelJcrInsert CamelJcrInsert or CamelJcrGetById operation to use
CamelJcrNodeName null Used to determine the node name to use.
When a message is sent to a JCR producer endpoint:
  • If the operation is CamelJcrInsert: A new node is created in the content repository, all the message properties of the IN message are transformed to JCR Value instances and added to the new node and the node's UUID is returned in the OUT message.
  • If the operation is CamelJcrGetById: A new node is retrieved from the repository using the message body as node identifier.

Consumer
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The consumer will connect to JCR periodically and return a List<javax.jcr.observation.Event> in the message body.
Expand
Name Default Value Description
eventTypes 0 A combination of one or more event types encoded as a bit mask value such as javax.jcr.observation.Event.NODE_ADDED, javax.jcr.observation.Event.NODE_REMOVED, etc.
deep false When it is true, events whose associated parent node is at current path or within its subgraph are received.
uuids null Only events whose associated parent node has one of the identifiers in the comma separated uuid list will be received.
nodeTypeNames null Only events whose associated parent node has one of the node types (or a subtype of one of the node types) in this list will be received.
noLocal false If noLocal is true, then events generated by the session through which the listener was registered are ignored. Otherwise, they are not ignored.
sessionLiveCheckInterval 60000 Interval in milliseconds to wait before each session live checking.
sessionLiveCheckIntervalOnStart 3000 Interval in milliseconds to wait before the first session live checking.

Example
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The snippet below creates a node named node under the /home/test node in the content repository. One additional attribute is added to the node as well: my.contents.property which will contain the body of the message being sent. 
from("direct:a").setProperty(JcrConstants.JCR_NODE_NAME, constant("node"))
        .setProperty("my.contents.property", body())
        .to("jcr://user:pass@repository/home/test");
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The following code will register an EventListener under the path import-application/inbox for Event.NODE_ADDED and Event.NODE_REMOVED events (event types 1 and 2, both masked as 3) and listening deep for all the children. 
<route>
    <from uri="jcr://user:pass@repository/import-application/inbox?eventTypes=3&deep=true" />
    <to uri="direct:execute-import-application" />
</route>
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