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4.3. Message Endpoint

Overview
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A message endpoint is the interface between an application and a messaging system. As shown in Figure 4.3, “Message Endpoint Pattern”, you can have a sender endpoint, sometimes called a proxy or a service consumer, which is responsible for sending In messages, and a receiver endpoint, sometimes called an endpoint or a service, which is responsible for receiving In messages.

Figure 4.3. Message Endpoint Pattern

Message endpoint pattern
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Message endpoint pattern

Types of endpoint
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Apache Camel defines two basic types of endpoint:
  • Consumer endpoint — Appears at the start of a Apache Camel route and reads In messages from an incoming channel (equivalent to a receiver endpoint).
  • Producer endpoint — Appears at the end of a Apache Camel route and writes In messages to an outgoing channel (equivalent to a sender endpoint). It is possible to define a route with multiple producer endpoints.

Endpoint URIs
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In Apache Camel, an endpoint is represented by an endpoint URI, which typically encapsulates the following kinds of data:
  • Endpoint URI for a consumer endpoint — Advertises a specific location (for example, to expose a service to which senders can connect). Alternatively, the URI can specify a message source, such as a message queue. The endpoint URI can include settings to configure the endpoint.
  • Endpoint URI for a producer endpoint — Contains details of where to send messages and includes the settings to configure the endpoint. In some cases, the URI specifies the location of a remote receiver endpoint; in other cases, the destination can have an abstract form, such as a queue name.
An endpoint URI in Apache Camel has the following general form: 
ComponentPrefix:ComponentSpecificURI
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Where ComponentPrefix is a URI prefix that identifies a particular Apache Camel component (see "EIP Component Reference" for details of all the supported components). The remaining part of the URI, ComponentSpecificURI, has a syntax defined by the particular component. For example, to connect to the JMS queue, Foo.Bar, you can define an endpoint URI like the following: 
jms:Foo.Bar
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To define a route that connects the consumer endpoint, file://local/router/messages/foo, directly to the producer endpoint, jms:Foo.Bar, you can use the following Java DSL fragment: 
from("file://local/router/messages/foo").to("jms:Foo.Bar");
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Alternatively, you can define the same route in XML, as follows: 
<camelContext id="CamelContextID" xmlns="http://camel.apache.org/schema/spring">
  <route>
    <from uri="file://local/router/messages/foo"/>
    <to uri="jms:Foo.Bar"/>
  </route>
</camelContext>
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