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Chapter 72. JCR
JCR Component
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>URI format
jcr://user:password@repository/path/to/node
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
The
repository element of the URI is used to look up the JCR Repository object in the Camel context registry.
Producer
| 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 headers of the IN message are transformed to
javax.jcr.Valueinstances 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.
Note
Please note that the JCR Producer used message properties instead of message headers in Camel versions earlier than 2.12.3.
Consumer
The consumer will connect to JCR periodically and return a
List<javax.jcr.observation.Event> in the message body.
| 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. |
username
|
Camel 2.15: Allows to specify the username as a uri parameter instead of in the authority section of the uri | |
password
|
Camel 2.15: Allows to specify the password as a uri parameter instead of in the authority section of the uri |
Example
The snippet below creates a node named
node under the /home/test node in the content repository. One additional property is added to the node as well: my.contents.property which will contain the body of the message being sent.
from("direct:a").setHeader(JcrConstants.JCR_NODE_NAME, constant("node"))
.setHeader("my.contents.property", body())
.to("jcr://user:pass@repository/home/test");
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>