我正在尝试实现一个长时间运行的后台进程,该进程在用户访问页面时产生。我想显示任务的进度,就像在这个例子中一样:http: //web.archive.org/web/20130122091205/http ://www.lunatech-research.com/archives/2011/10/31/进度条-jqueryui-websockets-playframework
有谁知道 PlayFramework 2.0 的教程(使用内置的 AKKA)?这个是1.2的
我正在尝试实现一个长时间运行的后台进程,该进程在用户访问页面时产生。我想显示任务的进度,就像在这个例子中一样:http: //web.archive.org/web/20130122091205/http ://www.lunatech-research.com/archives/2011/10/31/进度条-jqueryui-websockets-playframework
有谁知道 PlayFramework 2.0 的教程(使用内置的 AKKA)?这个是1.2的
在阅读了 Java 的所有 Akka 文档http://doc.akka.io/docs/akka/2.0.1/intro/getting-started-first-java.html之后,我想出了这个似乎运作良好的方法。
系统首先创建一个唯一的 Actor 来处理“报告”(当加载生成页面时)。这个actor生成一个子actor,它会向父actor报告它的进度。然后通过 JavaScript 轮询父 Actor 以获取子线程的状态。
一旦孩子完成,它就会终止,一旦父母检测到孩子完成,它就会自行终止。
以下是所有代码,如果我以错误的方式进行此操作,请随时将我撕裂!(可以将状态存储在 Actors 中吗?!?)
控制器代码:
public class Application extends Controller {
public static Result generateReport()
{
//create akka job
//we should really create the actor with UUID name so that someone can't guess
//and use the API to view the status of other peoples jobs, it be fairly easy
//to guess as it goes $a,$b,$c etc...
ActorRef myActor = Akka.system().actorOf(new Props(MyGeneratorMaster.class));
System.out.println( myActor.path());
myActor.tell(new ConfigMessage("blarg message"));
return ok(generating.render("blarg","title",myActor.path().name()));
}
public static Result status(String uuid)
{
uuid = "akka://application/user/"+uuid;
ActorRef myActor = Akka.system().actorFor(uuid);
if(myActor.isTerminated())
{
return ok("Report Generated - All Actors Terminated") ;
}
else
{
return async(
Akka.asPromise(ask(myActor,new StatusMessage(), 3000)).map(
new F.Function<Object,Result>() {
public Result apply(Object response) {
if(response instanceof ResultMessage)
{
return ok(((ResultMessage) response).getResult());
}
return ok(response.toString());
}
}
)
);
}
}
主要演员:
public class MyGeneratorMaster extends UntypedActor {
private int completed = 0;
@Override
public void postStop() {
super.postStop();
System.out.println("Master Killed");
}
@Override
public void onReceive(Object message) throws Exception {
if (message instanceof actors.messages.ConfigMessage) {
ConfigMessage config = (ConfigMessage) message;
System.out.println("Received Config:" + config.getConfig());
//Need to spawn child actor here..
ActorRef child = this.getContext().actorOf(new Props(MyGeneratorChildWorker.class));
//make the child thread do stuff
child.tell(new ConfigMessage("doSomething!"));
child.tell(akka.actor.PoisonPill.getInstance());//kill the child after the work is complete...
} else if (message instanceof StatusUpdate) {
System.out.println("Got Status Update");
completed = ((StatusUpdate) message).getProgress();
} else if (message instanceof StatusMessage) {
System.out.println("Got Status Message");
getSender().tell(new ResultMessage("Status: " + completed + "%"), getSelf());
if(completed == 100)
{
//kill this actor, we're done!
//could also call stop...
this.getSelf().tell(akka.actor.PoisonPill.getInstance());
}
} else {
System.out.println("unhandled message"+message.toString());
unhandled(message);
}
}
}
儿童演员:
public class MyGeneratorChildWorker extends UntypedActor {
@Override
public void postStop() {
super.postStop();
System.out.println("Child Killed");
}
@Override
public void onReceive(Object message) throws Exception {
if (message instanceof ConfigMessage) {
System.out.println("Created Child Worker");
System.out.println("Doing Work:");
try {
for (int i = 0; i <= 100; i++) {
//update parent
this.context().parent().tell(new StatusUpdate(i));
long j = 1;
//waste loads of cpu cycles
while (j < 1E8) {
j = j + 1;
}
}
} catch (Exception ex) {
}
System.out.println("Done Work:");
} else
unhandled(message);
}
}
带有长轮询 JavaScript 的视图页面:
@(message: String)(title: String)(id: String)@main(title) {
<h2>@message</h2>
<script type="text/javascript">
function getPercentage()
{
$.ajax({
type: "GET",
url: "/status/@id",
dataType: "html",
success: function(html)
{
$('#status').html(html);
}
});
}
$(document).ready(function() {
setInterval("getPercentage()",100);
});
</script>
<div id="status">
</div>
}