vertx的学习总结三

一、event bus是什么

各个verticle的通信

二、point-to-point, request-reply, publish/subscribe 通过 the event bus

例题一：点对点

package eventBus;

import io.vertx.core.AbstractVerticle;
import io.vertx.core.Vertx;

public class EventBusExample extends AbstractVerticle {

    public static void main(String[] args) {
        Vertx vertx = Vertx.vertx();
        vertx.deployVerticle(new EventBusExample());
    }

    @Override
    public void start() {
        vertx.eventBus().consumer("example.address", message -> {
            System.out.println("Received message: " + message.body());
            message.reply("Replying to the message");
        });

        vertx.eventBus().send("example.address", "Hello Vert.x");

    }
}

例题二：请求-应答

例题三：发布订阅

Send.java

package eventBus.pointTopoint;

import io.vertx.core.AbstractVerticle;
import io.vertx.core.eventbus.EventBus;

public class Send extends AbstractVerticle {
    @Override
    public void start() throws Exception {
        EventBus bus=vertx.eventBus();
        bus.publish("my.update","我怀疑是异步的，所以会sleep1000");
    }
}

Comsumer.java

package eventBus.pointTopoint;

import io.vertx.core.AbstractVerticle;
import io.vertx.core.eventbus.EventBus;

public class Comsumer extends AbstractVerticle {
    @Override
    public void start() throws Exception {
        EventBus bus = vertx.eventBus();
        bus.consumer("my.update",str->{
            String sty=(String) str.body();
            System.out.println(sty);
        });
    }
}

main.java

package eventBus.pointTopoint;

import io.vertx.core.Vertx;

public class Main {
    public static void main(String[] args) {
        Vertx vertx=Vertx.vertx();
        vertx.deployVerticle(new Comsumer());

        vertx.deployVerticle(new Send());

    }
}

我们之前用的都是在同一个本地的jvm，现在我们考虑一下不在本地的情况，使用节点管理器