Google App Engine Task Queue on GWT

Question

I\'m looking at Google App Engine\'s new task queue API for Java and I\'m having a hard time relating that to my GWT application. If I wanted to use a task queue to do some

Answer 1

Deferred.Deferable

Any plans for deferred.defer in Java?

import static com.google.appengine.api.labs.taskqueue.TaskOptions.Builder.taskName;

import java.io.IOException;

import javax.servlet.ServletException;

import com.newatlanta.appengine.taskqueue.Deferred;
import com.newatlanta.appengine.taskqueue.Deferred.Deferrable;

@SuppressWarnings("serial")
public class SampleTask implements Deferrable {

    private String arg1;
    private String arg2;

    public SampleTask() {
    }

    public SampleTask(String arg1, String arg2) {
        // save information to use later
        this.arg1 = arg1;
        this.arg2 = arg2;
    }

    @Override
    public void doTask() throws ServletException, IOException {
        // TODO do work here

        // this is how you 'schedule' a task
        // doing this here is recursive;
        // you most likely want to call this from
        // a server rpc endpoint
        SampleTask task = new SampleTask("arg1", "arg2");
        Deferred.defer(task, "queue-name", taskName("task-name"));
    }
}

Answer 2

Yes, worker would be a servlet which can handle a request with POST parameters. If you want an asynchronous call from client's point of view then RPC is enough (from server's point of view it is still synchronous). If you want to do "delayed" jobs which don't talk to your client, you can use a task queue.