Java Ee JMS API uses scene and best practice

Java Ee JMS (Java Message Service) API is a standardized message transmission API on the Java platform, which is mainly used in distributed systems to realize asynchronous communication and message transmission.This article will introduce the use scene of the JMS API and some best practices, and provide the corresponding Java code example. 1. Use the scene JMS API can achieve reliable message transmission and asynchronous communication in various scenarios.The following is a common usage scene of JMS API: 1.1. Event driving architecture The JMS API can drive the event driving architecture by publishing/subscribing mode.In this architecture, the publisher publishes the message to a specific topic (Topic), and the subscriber can subscribe to a specific theme to receive related messages.This model is suitable for systems that require real -time processing events and messages, and in real -time stock quotation system, real -time news push, etc. 1.2. Asynchronous task processing The JMS API can be used for asynchronous task processing and submits the task to a message queue, which is processed by consumers in the background.This can realize the decoupling and parallel treatment of the task, and improve the response ability and throughput of the system.Suitable for systems that need to process high -concurrency tasks, such as order processing, data import, etc. 1.3. Log processing The JMS API can be used to achieve log processing in a distributed system.By publishing log messages to the theme, different log consumers can subscribe and process the corresponding log messages.This can realize a unified log aggregation and processing to facilitate system failure investigation and monitoring. 2. Best practice Here are some of the best practices using JMS API: 2.1. The news is durable For key messages, it is recommended to use the durable function of the message to ensure that the message will not be lost under the situation of sending failure and the receiver offline.JMS provides two news transmission methods: persistence and non -persistence, which can be specified when creating a connection. Example code: // Create persistent connection Connection connection = connectionFactory.createConnection(); connection.setClientID("client1"); // Create persistent sessions Session session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE); // Create persistent publishers TopicPublisher publisher = session.createPublisher(topic); publisher.setDeliveryMode(DeliveryMode.PERSISTENT); 2.2. Anomalous treatment When using the JMS API, it is necessary to consider abnormal processing to ensure the reliable transmission of the message.You can use the abnormal processing mechanism provided by the JMS API, such as transaction and rollback function to deal with abnormalities during the sending and receiving process. Example code: try { // Create connection, session and publisher/subscriber, etc. // ... // Starting transaction session.beginTransaction(); // Send a message Message message = session.createTextMessage("Hello, JMS!"); publisher.publish(message); // Submit a transaction session.commit(); } catch (JMSException e) { // Roll back transactions session.rollback(); // Treatment abnormalities // ... } finally { // Turn off the connection connection.close(); } 2.3. Message filtering The JMS API provides Message Selector function, which can be filtered and selective consumption according to the attributes of the message.This can handle messages flexibly according to business logic and needs. Example code: // Create message subscriber TopicSubscriber subscriber = session.createSubscriber(topic, "color = 'red'", true); // Receive messages Message message = subscriber.receive(); summary: JMS API has a wide range of application scenarios in distributed systems, such as event -driven architecture, asynchronous task processing, and log processing.At the same time, following some best practices, such as durable message, abnormal processing and message filtering, it can ensure the reliability and efficiency of message transmission. The above is the Java Ee JMS API using the scene and the best practice of knowledge. At the same time, the corresponding Java code example is provided.It is hoped that developers who use the JMS API for message transmission.