如何使用 JMS 队列将消息发送到特定接收器

Question

Is it possible to send message to particular receiver using JMS Queue(HornetQ)?

Among so many receivers, I want certain message to be received by receiver which are running on Linux OS.

Every suggestion is appriciated.

Thanks.

Answer 1

You can set a message property using Message.setObjectProperty(String, Object) and then have your consumers select the messages they are interested in using Session.createConsumer(Destination, String)

Sender example:

Message message = session.createMessage();
message.setObjectProperty("OS", "LINUX");
producer.send(message);

Receiver example:

MessageConsumer consumer = session.createConsumer(destination, "OS = 'LINUX'");
//Use consumer to receive messages.

The receiver in the example will ignore (they will go to some other receiver) all messages that do not match the selector. In this case all message where the 'OS' property is not 'LINUX' will be ignored by this consumer.

Answer 2

You can set properties of JMS message: http://download.oracle.com/javaee/1.4/api/javax/jms/TextMessage.html and filter messages at client side. For example, message.setStringProperty("TARGET_OS", "LINUX") - at sender http://www.mkyong.com/java/how-to-detect-os-in-java-systemgetpropertyosname/ - detect OS at receivers and filter messages with correct TARGET_OS property

Answer 3

You can use JMS selectors on the consumer side to look for messages that fit specific criteria.

Answer 4

Not sure if I am missing something, you could keep things simple by having multiple queues - specific to each platform, then the linux based consumers can listen to the linux specific queue alone. Now your challenge probably will be to route the messages to the appropriate queue from the producer side, that should be fairly easy if the routing is based on some attribute of the message?