Jeromq framework and its technical principles in the Java library

Jeromq framework and its technical principles in the Java library analysis Overview: Jeromq is a pure Java real Zeromq (ZMQ) message transmission library.Zeromq is a high -performance, asynchronous message transmission library that can communicate reliable and fast communication between different applications.Jeromq uses Zeromq's message transmission mode and API, and provides Java developers with a simple and intuitive interface to process the communication needs of distributed applications.This article will introduce the technical principles of the Jeromq framework and provide related Java code examples. Basic principles of Jeromq: Jeromq uses Zeromq's message queue technology to use the transmission layer protocol TCP or IPC (Inter-Process Communication) as the underlying communication mechanism.It realizes the message sending and receiving through the socket object.Zeromq provides a variety of message modes (such as PUB/SUB, REQ/REP, Push/Pull, etc.). Jeromq can use these modes to meet the needs of different communication scenarios. The following is a simple Jeromq code example, which demonstrates the message sending and receiving in the REQ/REP mode: // Send end import org.jeromq.ZMQ; public class Requester { public static void main(String[] args) { // Create the context ZMQ.Context context = ZMQ.context(1); // Create Req type Socket ZMQ.Socket socket = context.socket(ZMQ.REQ); // The address and port connected to the receiving end socket.connect("tcp://localhost:5555"); // Send a message String message = "Hello, JeroMQ!"; socket.send(message.getBytes(), 0); System.out.println("Sent: " + message); // Waiting for the receiving side to reply byte[] reply = socket.recv(0); System.out.println("Received: " + new String(reply)); // Close the socket and context socket.close(); context.term(); } } // Receiving end import org.jeromq.ZMQ; public class Responder { public static void main(String[] args) { // Create the context ZMQ.Context context = ZMQ.context(1); // Create a rese type of socket ZMQ.Socket socket = context.socket(ZMQ.REP); // Bind to the local address and port socket.bind("tcp://localhost:5555"); System.out.println("Listening on port 5555..."); // Waiting for receiving message byte[] request = socket.recv(0); System.out.println("Received: " + new String(request)); // Reply message String replyMessage = "Hello, JeroMQ!"; socket.send(replyMessage.getBytes(), 0); System.out.println("Sent: " + replyMessage); // Close the socket and context socket.close(); context.term(); } } In the above examples, first of all, we created a context object (Context), which is used to manage the global state of Zeromq.We then created a socket object.The sender uses the Req type of the Socket to send a message, and the receiving terminal uses the Rep type socket to receive messages.The sending end is connected to the address and port of the receiving end via the Connect () method, and the receiver is bound to the local address and port through the Bind () method. The sending end uses the send () method to send a message, and wait through the RECV () method to wait for the receiving side to reply.The receiving terminal uses the RECV () method to wait for the receiving message and reply to the message through the send () method. Finally, we must remember to close the socket and context after the program is executed to release resources. Summarize: This article introduces the technical principle of the Jeromq framework and provides a simple Java code example to demonstrate the message sending and receiving in the REQ/REP mode.Jeromq provides a simple and intuitive interface to handle the communication needs of distributed applications by using the Zeromq message transmission mode and API to provide a simple and intuitive interface.With Jeromq, we can easily implement high -performance and reliable messages, and build a variety of complex distributed applications.