Build JEESZ distributed architecture 9-Introduction to message-oriented middleware and jeesz9 --

Build JEESZ distributed architecture 9-Introduction to message-oriented middleware and jeesz9 --

Introduction to message-oriented Middleware

1. Role of message-oriented middleware in JEESZ distributed architecture

1) message-oriented middleware sends and receives messages in a distributed system.

2) message-oriented middleware can use an efficient and reliable message transmission mechanism to exchange platform-independent data and integrate distributed systems based on data communication.

3) communication between processes can be extended in a distributed environment by providing message transmission and Message Queuing Models.

4) message-oriented middleware enables reliable asynchronous communication between applications or components to reduce coupling between systems and improve system scalability and availability.

 

2. JMS: Java MessageService

1) JMS is a message specification in JavaEE and a set of Apis irrelevant to specific platforms.

2) JMS element:

JMS provider ---- connect to an implementation of the JMS interface for message-oriented Middleware

JMS customer ------ Java-based applications or objects that produce or consume messages

JMS producer-create and send a message to the JMS Client

JMS consumer-the JMS customer who receives the message

JMS message ------ objects of data that can be transferred between JMS customers

JMS queue ------ a region that holds messages sent waiting for reading

JMS topic ------ A mechanism that supports sending messages to multiple subscribers

3) JMS application interface

ConnectionFactory: The managed object used by the user to create a connection to the JMS provider.

Connection: the Connection represents the communication link between the application and the message server.

Destination: the location where messages are published and received, queue, or topic.

MessageProducer: an object created by a session used to send messages to the target.

MessageConsumer: an object created by a session to receive messages sent to the target.

Message: an object transmitted between the consumer and the producer.

Session: indicates the context of a single thread, used to send and receive messages.

4) JMS message model

1. Point-to-point or Queue Model

 

• The message producer sends the production message to the queue, and then the message consumer extracts and consumes the message from the queue.
• After a message is consumed, it is no longer stored in the queue, so the message consumer cannot consume the message that has been consumed.
• Queue supports multiple consumers, but only one consumer can consume one message.

2. Publisher/subscriber Model

 

 

 

• The message producer (publish) publishes a message to a topic, and multiple message consumers (subscribe) consume the message. Messages published to a topic are consumed by all subscribers.

Note: JEESZActiveMQ is used in the system.Middleware

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