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ProducerTemplate

The ProducerTemplate interface allows you to send message exchanges to endpoints in a variety of different ways to make it easy to work with Camel Endpoint instances from Java code.

It can be configured with a default endpoint if you just want to send lots of messages to the same endpoint; or you can specify an Endpoint or uri as the first parameter.

The sendBody() method allows you to send any object to an endpoint easily.

ProducerTemplate template = exchange.getContext().createProducerTemplate();

// send to default endpoint
template.sendBody("<hello>world!</hello>");

// send to a specific queue
template.sendBody("activemq:MyQueue", "<hello>world!</hello>");

// send with a body and header 
template.sendBodyAndHeader("activemq:MyQueue", 
   "<hello>world!</hello>",
   "CustomerRating", "Gold");

You can also supply an Exchange or a Processor to customize the exchange

request*() methods

The send*() methods use the default Message Exchange Pattern (InOnly, InOut etc) as the endpoint. If you want to explicitly perform a request/response (InOut) you can use the request*() methods instead of the send*() methods.

e.g. lets invoke an endpoint and get the response

Object response = template.requestBody("<hello/>");

// you can cast the response directly
String ret = template.requestBody("<hello/>", String.class);

// or specify the endpoint directly
String ret = template.requestBody("cxf:bean:HelloWorldService", "<hello/>", String.class);

 

Fluent interface (camel 2.18.0)

The FluentProducerTemplate provides a fluent syntax to ProducerTemplate,, examples:

 

Set headers and body
Integer result = FluentProducerTemplate.on(context)
    .withHeader("key-1", "value-1")
    .withHeader("key-2", "value-2")
    .withBody("Hello")
    .to("direct:inout")
    .request(Integer.class)
Use a processor
Integer result = FluentProducerTemplate.on(context)
    .withProcessor(exchange -> exchange.getIn().setBody("Hello World"))
    .to("direct:exception")
    .request(Integer.class);
Customize template
Object result = FluentProducerTemplate.on(context)
    .withTemplateCustomizer(
        template -> {
            template.setExecutorService(myExecutor);
            template.setMaximumCacheSize(10);
        }
    )
    .withBody("the body")
    .to("direct:start")
    .request()
 

 

 

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