2.2.
分布式Topic
Hazelcast
提供发布消息的分布式机制,让消息传递给多个订阅者,如同已知的发布/
订阅(pub / sub
)消息传递模型。发布和订阅作用于群集范围。当一成员订阅了一个主题,它实际上是注册了任何集群中的成员消息,包括在您添加的侦听器后新加入的成员发布的消息。
消息是有顺序的,也就是说,监听者(订阅者)将按照消息实际发布的顺序处理。如果集群成员M
发布消息M1
,M2
,M3...Mn
到一个主题T
,然后Hazelcast
可以确保所有主题T
的订阅者,都能按照顺序接收和处理M1
,M2
,M3...Mn
。
import com.hazelcast.core.Topic;
import com.hazelcast.core.Hazelcast;
import com.hazelcast.core.MessageListener;
public class Sample implements MessageListener {
public static void
main(String[] args) {
Sample sample =
new Sample();
Topic topic =
Hazelcast.getTopic ("default");
topic.addMessageListener(sample);
topic.publish
("my-message-object");
}
public void
onMessage(Object msg) {
System.out.println("Message
received = " + msg);
}
}
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