JMS 中 PointToPoint 和发布/订阅模型的区别
原文:https://www . geesforgeks . org/pointtopoint-and-publish-subscribe-model-in-JMS/之间的差异
点对点消息模型和发布订阅消息模型是 Java 消息服务(JMS) 支持的两类消息模块/类型/域。
这两个是支持异构系统之间异步消息传递的编程模型。
有一些重要的术语，将有助于我们更好地理解这两种消息模型类型之间的区别:
- JMS destination is a transit area, which serves as the source of messages used by clients and the destination/destination of generated messages.
- JMS producer is a JMS client that sends messages.
- JMS consumer is a JMS client that receives messages.
- A JMS client can be both a message producer and a message consumer.
- Time Dependence Simply put, if the producer publishes the news of a certain topic and the consumer does not subscribe, then the consumer will not receive the news of the topic.
我们来看看这两种消息模型类型的区别:
| [T0】 PointToPoint Messaging-Model (P2P) | Publish/subscribe model (pub sub) |
|---|---|
| The JMS Destination here is the queue. | And JMS destinations in pubs are a topic. |
| The JMS producer here is the sender. | The JMS producer in Pub sub is a publisher. |
| The JMS consumer here is the receiver. | And JMS consumers in Pub sub are subscribers. |
| The message here is only received by one JMS consumer. | In Pub sub, a message can be received by multiple JMS consumers. |
| Here, the JMS consumer sends a confirmation to the producer when receiving the message. | In Pub sub, JMS consumers will not send any confirmation when they receive messages. |
| There is a time dependence of the receiver receiving the message. | In Pub sub, there is no time dependence between producers and consumers. |
| This model is pull-type, that is, the receiver is responsible for requesting the sender to send new messages. | Although this mode is based on push, it means that messages are automatically delivered to consumers, and they don't have to request new messages. |
| is ex. Send fax/voice messages. | is ex. Newspapers. |
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