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Camel supports the integration of beans with Camel message exchanges and POJOs in a number of ways.
Bean Component
The Bean component supports the creation of a proxy via ProxyHelper to a Java interface; which the implementation just sends a message containing a BeanInvocation to some camel endpoint.
Then there is a server side implementation which consumes a message and uses the Bean Binding to bind the message to invoke a method passing in its parameters.
Bean Post Processor
If a bean is defined in Spring XML and it has some Camel annotations then it can be processed to inject resources.
Sendings messages
To allow sending of messages you can use @EndpointInject() annotation. This will inject either a [ProducerTemplate|http://activemq.apache.org/camel/maven/camel-core/apidocs/org/apache/camel/ProducerTemplate.html) or CamelTemplate so that the bean can send message exchanges.
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Annotations
If a bean is defined in Spring XML or scanned using the Spring component scanning mechanism and a <camelContext> is used or a CamelBeanPostProcessor
then we process a number of Camel annotations to do various things such as injecting resources or producing, consuming or routing messages.
The following annotations is supported and inject by Camel's CamelBeanPostProcessor
Annotation | Description |
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| To inject an endpoint, see more details at POJO Producing. |
| Camel 2.13: To inject a bean obtained from the Registry. See Bean Injection. |
| Camel 2.12: To inject a value using property placeholder. |
| To inject a producer to send message to an endpoint. See POJO Producing. |
| To inject a consumer on a method. See POJO Consuming. |
See more details at:
- POJO Consuming to consume and possibly route messages from Camel
- POJO Producing to make it easy to produce camel messages from your POJOs
- DynamicRouter Annotation for creating a Dynamic Router from a POJO method
- RecipientList Annotation for creating a Recipient List from a POJO method
- RoutingSlip Annotation for creating a Routing Slip for a POJO method
- Bean Injection to inject Camel related resources into your POJOs
- Using Exchange Pattern Annotations describes how the pattern annotations can be used to change the behaviour of method invocations with Spring Remoting or POJO Producing
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See the POJO Messaging Example for how to use the annotations for routing and messaging. |
Bean Component
The Bean component allows one to invoke a particular method. Alternately the Bean component supports the creation of a proxy via ProxyHelper to a Java interface; which the implementation just sends a message containing a BeanInvocation to some Camel endpoint.
Consuming messages
Spring Remoting
We support a Spring Remoting provider which uses Camel as the underlying transport mechanism. The nice thing about this approach is we can use any of the Camel transport Components to communicate between beans. It also means we can use Content Based Router and the other Enterprise Integration Patterns in between the beans; in particular we can use Message Translator to be able to convert what the on-the-wire messages look like in addition to adding various headers and so forth.
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Whenever Camel invokes a bean method via one of the above methods (Bean component, Spring Remoting or POJO Consuming) then the Bean Binding mechanism is used to figure out what method to use (if it is not explicit) and how to bind the Message to the parameters possibly using the Parameter Binding Annotations or using a method name option. |
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