The technical principles of Jeromq framework in the Java class library
Jeromq is a pure Java message transmission library based on the ZEROMQ protocol.In this article, we will explore the technical principles of Jeromq and how to use it to achieve reliable message transmission.
Technical principle:
Jeromq is implemented by embedding the C language of Zeromq into the Java virtual machine.It inherits the high performance and reliability of Zeromq and provides the ability to seamlessly integrate with the Java application.
The core of Jeromq is JNI (Java Native Interface), which allows Java code to interact with the bottom C code.In Jeromq, JNI is used to communicate with the Zeromq C library, so that the Java application can directly call the function of Zeromq.In this way, Jeromq can provide low latency, high throughput and high composite performance.
In addition to using JNI to interact with ZEROMQ, Jeromq also made full use of Java's asynchronous IO mechanism.It uses the Java NIO library to achieve non -blocking network communication, which can process a large amount of connection at the same time and respond to external events.
Use Jeromq to achieve reliable message transmission:
Below is an example of using Jeromq to transmit reliable messages.In this example, we will create a simple publisher and subscriber that can communicate through Jeromq.
First, we need to add Jeromq to our project.The following dependencies can be added to Maven or Gradle configuration files:
<dependency>
<groupId>org.zeromq</groupId>
<artifactId>jzmq</artifactId>
<version>3.1.0</version>
</dependency>
We can then write the code of the publisher and subscriber.The following is a simple example:
import org.zeromq.ZMQ;
public class Publisher {
public static void main(String[] args) {
ZMQ.Context context = ZMQ.context(1);
ZMQ.Socket publisher = context.socket(ZMQ.PUB);
publisher.bind("tcp://localhost:5556");
while (true) {
String message = "Hello, subscribers!";
publisher.send(message.getBytes(), 0);
}
}
}
import org.zeromq.ZMQ;
public class Subscriber {
public static void main(String[] args) {
ZMQ.Context context = ZMQ.context(1);
ZMQ.Socket subscriber = context.socket(ZMQ.SUB);
subscriber.connect("tcp://localhost:5556");
subscriber.subscribe("".getBytes());
while (true) {
byte[] message = subscriber.recv(0);
System.out.println("Received message: " + new String(message));
}
}
}
In the above code, the publisher is bound to the specified address by creating a PUB type socket, and then sending a message.The subscriber is connected to the same address by creating a SUB type socket and subscribing all the messages.Then it will continue to receive and print the information received.
By running the above code, we can realize the system of a simple publisher and subscriber, and they can pass reliable messages through Jeromq.
in conclusion:
Jeromq is a library for realizing reliable messages in Java applications.It uses Zeromq's high performance and reliability, and achieves seamless integration with Java through the asynchronous IO mechanism of JNI and Java.By using Jeromq, we can easily build high -performance, reliable distributed systems.
I hope this article will help you with Jeromq's technical principles and inspire your use in actual applications.
