Angular5集成eventbus的示例代码

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});

}

更多信息请参考这里 https://vertx.io/docs/vertx-web/java/

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。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。