Angular5集成eventbus的示例代码
时间：2021-04-19 08:04:57|栏目：AngularJS|点击： 次
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。
