Akka2使用探索3（Duration 和 Deadline）

akka提供了兩個關於時長的數據類型：Duration 和 Deadline，好比5秒鐘這種含義。

Duration.Inf表示無限，Duration.MinusInf表示負無限

Deadline, 表示一個絕對的時間點，意義是最終期限，而且支持經過計算當前時間到deadline之間的差距來生成Duration

下面是使用方法：

 

import akka.util.Duration
import java.util.concurrent.TimeUnit
import akka.util.FiniteDuration
import akka.util.Deadline
import akka.dispatch.Await
import akka.dispatch.Futures
import java.util.concurrent.Callable
import akka.dispatch.Future
import akka.actor.ActorSystem

class DurationTest extends GroovyTestCase {
    def testDurationUse() {
        println new FiniteDuration(5, TimeUnit.SECONDS)
        println Duration.create(5d, TimeUnit.SECONDS)
        println Duration.create(5, "second")
        println Duration.create(5L, "second")
        println()
        println Duration.parse("5second")
        println Duration.parse("5 second")
        println Duration.parse("5 seconds")
        println Duration.parse("5seconds")
        println()
        println Duration.Inf()
        println Duration.Zero()
        println Duration.MinusInf()

    }

    def testDeadline() {
        Deadline d = Duration.create(5, "second").fromNow()
        def future = Futures.future(new Callable<String>() {
            String call() {
                println "start...";
                sleep(1000 * 60);
                println("end...");
                return "sd";
            }
        }, ActorSystem.create("test").dispatcher())

        String result = (String) Await.result(Futures.future({println "start..."; sleep(1000 * 60); println("end..."); return "sd";} as Callable, ActorSystem.create("test").dispatcher()), d.timeLeft())
        sleep(1000 * 60)
    }

    def testDeadline2() {
        Future<String> f = Futures.future(new Callable<String>() {
            public String call() {
                return "Hello" + "World";
            }
        }, ActorSystem.create("test").dispatcher());
        String result = (String) Await.result(f, Duration.create(5, "second"));
        println result
    }
}