A point-to-point channel, shown in Figure 5.1 is a message channel that guarantees that only one receiver consumes any given message. This is in contrast with a publish-subscribe channel, which allows multiple receivers to consume the same message. In particular, with a point-to-point channel, it is possible for multiple receivers to subscribe to the same channel. If more than one receiver competes to consume a message, it is up to the message channel to ensure that only one receiver actually consumes the message.
The following Fuse Mediation Router components support the point-to-point channel pattern:
In JMS, a point-to-point channel is represented by a queue. For
example, you can specify the endpoint URI for a JMS queue called Foo.Bar
as
follows:
jms:queue:Foo.Bar
The qualifier, queue:
, is optional, because the JMS component creates a
queue endpoint by default. Therefore, you can also specify the following equivalent endpoint
URI:
jms:Foo.Bar
See JMS in EIP Component Reference for more details.
In ActiveMQ, a point-to-point channel is represented by a queue. For example, you can
specify the endpoint URI for an ActiveMQ queue called Foo.Bar
as
follows:
activemq:queue:Foo.Bar
See ActiveMQ in EIP Component Reference for more details.
The Fuse Mediation Router Staged Event-Driven Architecture (SEDA) component is implemented using a
blocking queue. Use the SEDA component if you want to create a lightweight point-to-point
channel that is internal to the Fuse Mediation Router application. For example, you
can specify an endpoint URI for a SEDA queue called SedaQueue
as
follows:
seda:SedaQueue
The Java Persistence API (JPA) component is an EJB 3 persistence standard that is used to write entity beans out to a database. See JPA in EIP Component Reference for more details.
The XMPP (Jabber) component supports the point-to-point channel pattern when it is used in the person-to-person mode of communication. See XMPP in EIP Component Reference for more details.