Bean Integration
Camel supports the integration of beans and POJOs in a number of ways
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. |
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Camel 2.13: To inject a bean obtained from the Registry. See Bean Injection. |
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Camel 2.12: To inject a value using property placeholder. |
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To inject a producer to send message to an endpoint. See POJO Producing. |
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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
Example
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.
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.
Bean binding
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.