如何生成独立的子代并在node.js中重新建立通信？

Question

首先是代码：

---

test.js：

var cluster = require("cluster");

if (cluster.isMaster) {
    var app = cluster.fork();

    app.on("message", function(code) {
        console.log("Parent received: " + code);
        app.send("this is from the test.js parent");
        });
    }
else {
    process.send("");
    process.on("message", function(code) {
        console.log("Child received: " + code);
        process.send("this is from the test.js child");
        require("./testobj.js");
        process.exit(0);
        });
    }

---

testobj.js：

process.send("this is from testobj.js");

process.on("message", function(code) {
    console.log("testobj.js received: " + code);
    });

process.send("this is the second message from testobj.js");

while (true) {}

运行节点test.js的结果

Parent received: 
Child received: this is from the test.js parent
Parent received: this is from the test.js child
Parent received: this is from testobj.js
Parent received: this is the second message from testobj.js

---

到目前为止，您已经了解了我的工作，目标是生成独立于父代的子流程，但仍保留双向通信。 到目前为止，该测试代码保留了子对父之间的通信，但不保留子对父之间的通信。 是否有人对如何保留或重新建立父母与孩子之间的沟通有任何建议？

Answer 1

while(true){}永久冻结了该孩子的事件循环，尽管process.exit(0)杀死了派生的工作者，但使其不再那么永久。 据我所知，您不能退出进程并保持通信（因为该进程实际上不再运行）。

通过添加更多事件侦听器，您应该能够更轻松地查看正在发生的情况。 fork事件有一个不错的示例，尽管它在您的app变量而不是引用的cluster变量上。

app.on('fork', function(worker) {
  console.log('Worker forked: ' + worker.id);
  console.log(worker);
});
app.on('listening', function(worker, address) {
  console.log('Worker listening: ' + worker.id);
  console.log(address);
});
app.on('exit', function(worker, code, signal) {
  console.log('Worker exited: ' + worker.id);
  console.log('Code: ' + code + ' Signal: ' + signal);
});

根据worker.send文档/示例，似乎可以使用else if(cluster.isWorker)代替每个示例中的else ：

if (cluster.isMaster) {
  var worker = cluster.fork();
  worker.send('hi there');
} else if (cluster.isWorker) {
  process.on('message', function(msg) {
    process.send(msg);
  });
}