Angular5集成eventbus的示例代码

时间:2020-05-16 是小太阳呀人气:0

1.package.json中

"dependencies": {
   ...
  "vertx3-eventbus-client": "3.5.2",
 },

然后 npm install，或者：

npm install vertx3-eventbus-client@3.5.2

2.angular-cli.json中

 "scripts": [
     ...
    "../node_modules/vertx3-eventbus-client/vertx-eventbus.js"
   ],

3.创建一个eventbus.service.ts用来通信

导入eventbus：

import { EventBus } from 'vertx3-eventbus-client';

声明eventbus:

declare var EventBus: any;

4.创建eventbus实例，监听接口以及发送消息

//创建实例
var eb = new EventBus('http://localhost:8080/eventbus');

eb.onopen = function() {
 //注册监听器用来接受消息
 eb.registerHandler('some-address', function(error, message) {
  console.log('received a message: ' + JSON.stringify(message));
 });

 //发送消息
 eb.send('some-address', {name: 'tim', age: 587});

}

注：

对于需要发送消息来接受的消息，需要先监听，然后再发送消息。
对于一直推送的消息，不需要发送。

代码实例如下：

RegisterHandler(key, id, callback) {
    const address = '***.' + key + '.' + id;
    if (typeof (this.eventBus[key]) === 'undefined' || !this.eventBus[key]) {
      this.eventBus[key] = new EventBus(environment.eventbusUrl);
    }
    if (this.eventBus[key].state === EventBus.OPEN) {
      this.eventBus[key].registerHandler(address, callback);
    } else {
      const $this = this;
      this.eventBus[key].onopen = function () {
        $this.eventBus[key].registerHandler(address, callback)
      }
    }
  }

Send(key, id) {
    var data = '';
    const address = ***.' + key + '.' + id;
    if (typeof (this.eventBus[key]) === 'undefined' || !this.eventBus[key]) {
      this.eventBus[key] = new EventBus(environment.eventbusUrl);
    }
    if (this.eventBus[key].state === EventBus.OPEN) {
      this.eventBus[key].send(address, data)
    } else {
      const $this = this;
      this.eventBus[key].onopen = function () {
        $this.eventBus[key].send(address, data)
      }
    }
  }

closeEventBus(key) {
    if (typeof (this.eventBus[key]) !== 'undefined' && this.eventBus[key] && this.eventBus[key].state === EventBus.OPEN) {
      this.eventBus[key].close();
    }
    this.eventBus[key] = null;
}

在组件ngOnDestroy中调用closeEventBus关闭eventbus。

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