zmq.push/pull java_ZeroMQ之push/pull模式 | 学步园

最新推荐文章于 2022-06-29 09:57:41 发布

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最新推荐文章于 2022-06-29 09:57:41 发布

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文章标签： zmq.push/pull java

本文链接：https://blog.youkuaiyun.com/weixin_29779159/article/details/114667979

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本文介绍了Java中使用ZeroMQ库实现Push/Pull模式进行服务器与客户端间的消息通信。Push角色用于发送消息，通过绑定端口；Pull角色用于接收消息，通过连接到服务器。示例代码展示了如何创建Push服务器和两个Pull客户端，消息发送有序且仅被一个客户端消费，适合多消费者场景。

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PUHS: 用于发送消息，定义一个zeromq的socket实例，用于send msg

PULL: 用于接收消息，recv msg

用于服务器与客户端消息通信。

下面是服务器给客户端发送消息的代码，服务器PUSH(绑定一个端口号)，客户端PULL(连接服务器)

服务器端代码

Java代码

package pushpull;

import org.zeromq.ZMQ;

public class Push {

public static void main(String[] args) throws InterruptedException {

// TODO Auto-generated method stub

ZMQ.Context context = ZMQ.context(1);

ZMQ.Socket sender = context.socket(ZMQ.PUSH);

sender.bind("tcp://*:5557");

int i = 0;

while (true) {

Thread.currentThread().sleep(2000);

i++;

sender.send(("msg" + i).getBytes(), 0);

}

package pushpull;import org.zeromq.ZMQ;public class Push { public static void main(String[] args) throws InterruptedException {// TODO Auto-generated method stubZMQ.Context context = ZMQ.context(1);ZMQ.Socket sender = context.socket(ZMQ.PUSH);sender.bind("tcp://*:5557");int i = 0;while (true) { Thread.currentThread().sleep(2000); i++; sender.send(("msg" + i).getBytes(), 0);} }}

客户端A的代码

Java代码

package pushpull;

import org.zeromq.ZMQ;

public class PullA {

public static void main(String[] args) {

// TODO Auto-generated method stub

ZMQ.Context context = ZMQ.context(1);

ZMQ.Socket receiver = context.socket(ZMQ.PULL);

receiver.connect("tcp://localhost:5557");

while (true) {

// String msg = new String(receiver.recv(0));

System.out.println(new String(receiver.recv(0)));

}

package pushpull;import org.zeromq.ZMQ;public class PullA { public static void main(String[] args) {// TODO Auto-generated method stubZMQ.Context context = ZMQ.context(1);ZMQ.Socket receiver = context.socket(ZMQ.PULL);receiver.connect("tcp://localhost:5557");while (true) { // String msg = new String(receiver.recv(0)); System.out.println(new String(receiver.recv(0)));} }}

客户端B的代码

Java代码

package pushpull;

import org.zeromq.ZMQ;

public class PullB {

public static void main(String[] args) {

// TODO Auto-generated method stub

ZMQ.Context context = ZMQ.context(1);

ZMQ.Socket receiver = context.socket(ZMQ.PULL);

receiver.connect("tcp://localhost:5557");

while (true) {

System.out.println(new String(receiver.recv(0)));

}

package pushpull;import org.zeromq.ZMQ;public class PullB { public static void main(String[] args) {// TODO Auto-generated method stubZMQ.Context context = ZMQ.context(1);ZMQ.Socket receiver = context.socket(ZMQ.PULL);receiver.connect("tcp://localhost:5557");while (true) { System.out.println(new String(receiver.recv(0)));} }}

客户端A接受的消息是

Java代码

msg5

msg7

msg9

msg11

...

msg5 msg7 msg9 msg11 ...

客户端B接收的消息是

Java代码

msg1

msg2

msg3

msg4

msg6

msg8

msg10

...

msg1msg2 msg3 msg4 msg6 msg8 msg10...

可以看出push/pull模式是单向的，很适合消费者能力不足的情况，可以提供多个消费者。一条消息如果被A消费，B将不会再消费这条消息。

如果客户端给服务器发送消息，则服务器PULL(绑定一个端口号)，客户端PUSH(连接服务器)