Question

如何在Play 2.0框架中创建Promise<Result> - Java

我看到此链接http://www.playframework.org/documentation/2.0.4/JavaAsync。它没有包含那么多细节。你知道任何教程而不是引用我吗？ PLS。

Answer 1

这是在Play 2.2中创建Promise的新方法

Promise<Boolean> myPromise = Promise.promise(new Function0<Boolean>() {
    public Boolean apply() throws Throwable {
        // TODO - Add Implementation here.
        return Boolean.TRUE;
    }

});

Answer 2

James Roper（Play Framework开发人员）在Play with Java中使用Promise就是一个很好的例子： https://github.com/jroper/play-promise-presentation/blob/master/src/main/java/controllers/Application.java

Answer 3

正如the doc that you mention中所述，使用Akka.future：

Promise<Result> promiseOfResult = Akka.future(
    new Callable<Result>() {
      public Result call() {
        return ok("This is a promise result !");
      }
    }
  );

Answer 4

public F.Promise<Result> asyncFoo() {

          F.Promise<Integer> promise = F.Promise.promise(() -> longRunningCalculation());

          return promise.map((Integer i) -> ok("The calculation result is: " + i));

}

https://www.typesafe.com/blog/play-framework-with-java-8

如何创建Promise <result> play2.0框架 - Java </result>

4 个答案: