In -depth understanding of the principle of implementation principle
In -depth understanding of the principle of implementation principle
Brief introduction
Java Ee (Java Enterprise Edition) is a platform for developing enterprise applications.It provides many powerful APIs, including Java Message Service (JMS) API.The JMS API is a standard API used to implement message transmission. It provides a reliable asynchronous communication model to send and receive messages between distributed systems.This article will focus on the implementation principle of the Java Ee JMS API.
JMS API's working principle
The JMS API is based on the release/subscription model or point -to -point model.In the release/subscription model, the publisher sent a message to a topic, and the message subscriber subscribed to the theme to receive the message.In the point -to -point model, the message publisher sends a message to a queue, and the message receiver receives the message from the queue.
The underlying provider of the JMS API is a JMS message-oriented Middleware.The Java EE specification does not provide direct JMS implementation, but defines an interface specification for the realization of the developer of the message intermediate parts.
Below is an example code that uses Java Ee JMS API in practical applications:
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Topic;
import org.apache.activemq.ActiveMQConnectionFactory;
public class JMSExample {
public static void main(String[] args) throws Exception {
// Create a connection factory
ConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://localhost:61616");
// Create a connection
Connection connection = connectionFactory.createConnection();
connection.start();
// Create the meeting
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
// Create the topic
Topic topic = session.createTopic("exampleTopic");
// Create a message sender
MessageProducer producer = session.createProducer(topic);
// Create messages
TextMessage message = session.createTextMessage();
message.setText("Hello, JMS!");
// Send a message
producer.send(message);
// Close the resource
producer.close();
session.close();
connection.close();
}
}
The above code creates a JMS connection factory, and then uses the factory to create a JMS connection.Then, it created a session and created a theme with sessions.Then, it created a message sender and created a message.Finally, it uses the sender to send the message to the theme.
In the above example, we use Apache ActiveMQ as a provider of JMS message middleware.You can also choose other JMS message middleware, such as rabbitmq, IBM MQ, etc.
in conclusion
By deeply understanding the implementation principle of the Java Ee JMS API, you can better use the JMS API to build a reliable and asynchronous message transmission system.You can choose the JMS message middleware that suits your needs, and use the JMS API according to the specific specifications of the middleware and implementation.
Note: This article only introduces the basic methods and implementation principles of the JMS API. The details of the specific JMS API usage and the implementation of the middle parts of the underlying message may be different. Please check the relevant documents and materials to obtain more accurate and detailed information.
