[英]How to offload blocking operation to a worker Verticle using websockets and async request
我使用Vert.x 3实现websockets。
场景很简单:从客户端打开套接字,在顶点垂直工作器上执行一些“阻塞”工作,并在完成对客户端答案的响应后(通过打开的套接字)
请告诉我我是否做对了:
创建了VertxWebsocketServerVerticle。 当websocket打开并且请求来自客户端时,我正在使用eventBus并将消息传递给
EventBusReceiverVerticle。 在那里我正在执行阻塞操作。
我如何实际上将响应发送回VertxWebsocketServerVerticle并将其发送回客户端?
码:
主班:
public static void main(String[] args) throws InterruptedException {
Vertx vertx = Vertx.vertx();
vertx.deployVerticle(new EventBusReceiverVerticle("R1"),new DeploymentOptions().setWorker(true));
vertx.deployVerticle(new VertxWebsocketServerVerticle());
}
VertxWebsocketServerVerticle:
public class VertxWebsocketServerVerticle extends AbstractVerticle {
public void start() {
vertx.createHttpServer().websocketHandler(webSocketHandler -> {
System.out.println("Connected!");
Buffer buff = Buffer.buffer().appendInt(12).appendString("foo");
webSocketHandler.writeFinalBinaryFrame(buff);
webSocketHandler.handler(buffer -> {
String inputString = buffer.getString(0, buffer.length());
System.out.println("inputString=" + inputString);
vertx.executeBlocking(future -> {
vertx.eventBus().send("anAddress", inputString, event -> System.out.printf("got back from reply"));
future.complete();
}, res -> {
if (res.succeeded()) {
webSocketHandler.writeFinalTextFrame("output=" + inputString + "_result");
}
});
});
}).listen(8080);
}
@Override
public void stop() throws Exception {
super.stop();
}
}
EventBusReceiverVerticle:
public class EventBusReceiverVerticle extends AbstractVerticle {
private String name = null;
public EventBusReceiverVerticle(String name) {
this.name = name;
}
public void start(Future<Void> startFuture) {
vertx.eventBus().consumer("anAddress", message -> {
System.out.println(this.name +
" received message: " +
message.body());
try {
//doing some looong work..
Thread.sleep(10000);
System.out.printf("finished waiting\n");
startFuture.complete();
} catch (InterruptedException e) {
e.printStackTrace();
}
});
}
}
我总是得到:
WARNING: Message reply handler timed out as no reply was received - it will be removed
github项目位于: https : //github.com/IdanFridman/VertxAndWebSockets谢谢雷。
由于您一直在阻止websocket处理程序,直到它收到对发送到EventBus的已发送消息的答复为止,实际上,直到设置的延迟10秒 ,才会收到该消息,因此您肯定会收到警告,因为事件的答复处理程序总线将超时 - >消息发送,但没有在超时延迟之前接收到的响应。
实际上,我不知道您是否只是在试验Vert.x工具包,还是想满足某些要求,但是当然您必须调整代码以符合Vert.x精神:
Thread.sleep(delay)
,即vertx.setTimer(...)
。
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