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/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */


import junit.framework.*;
import java.util.*;
import java.util.concurrent.*;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import java.util.concurrent.atomic.*;
import java.math.BigInteger;
import java.security.*;

public class ExecutorCompletionServiceTest extends JSR166TestCase {
    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }
    public static Test suite() {
        return new TestSuite(ExecutorCompletionServiceTest.class);
    }


    /**
     * Creating a new ECS with null Executor throw NPE
     */
    public void testConstructorNPE() {
        try {
            ExecutorCompletionService ecs = new ExecutorCompletionService(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * Creating a new ECS with null queue throw NPE
     */
    public void testConstructorNPE2() {
        try {
            ExecutorService e = Executors.newCachedThreadPool();
            ExecutorCompletionService ecs = new ExecutorCompletionService(e, null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * Submitting a null callable throws NPE
     */
    public void testSubmitNPE() {
        ExecutorService e = Executors.newCachedThreadPool();
        ExecutorCompletionService ecs = new ExecutorCompletionService(e);
        try {
            Callable c = null;
            ecs.submit(c);
            shouldThrow();
        } catch (NullPointerException success) {
        } finally {
            joinPool(e);
        }
    }

    /**
     * Submitting a null runnable throws NPE
     */
    public void testSubmitNPE2() {
        ExecutorService e = Executors.newCachedThreadPool();
        ExecutorCompletionService ecs = new ExecutorCompletionService(e);
        try {
            Runnable r = null;
            ecs.submit(r, Boolean.TRUE);
            shouldThrow();
        } catch (NullPointerException success) {
        } finally {
            joinPool(e);
        }
    }

    /**
     * A taken submitted task is completed
     */
    public void testTake() throws InterruptedException {
        ExecutorService e = Executors.newCachedThreadPool();
        ExecutorCompletionService ecs = new ExecutorCompletionService(e);
        try {
            Callable c = new StringTask();
            ecs.submit(c);
            Future f = ecs.take();
            assertTrue(f.isDone());
        } finally {
            joinPool(e);
        }
    }

    /**
     * Take returns the same future object returned by submit
     */
    public void testTake2() throws InterruptedException {
        ExecutorService e = Executors.newCachedThreadPool();
        ExecutorCompletionService ecs = new ExecutorCompletionService(e);
        try {
            Callable c = new StringTask();
            Future f1 = ecs.submit(c);
            Future f2 = ecs.take();
            assertSame(f1, f2);
        } finally {
            joinPool(e);
        }
    }

    /**
     * If poll returns non-null, the returned task is completed
     */
    public void testPoll1() throws InterruptedException {
        ExecutorService e = Executors.newCachedThreadPool();
        ExecutorCompletionService ecs = new ExecutorCompletionService(e);
        try {
            assertNull(ecs.poll());
            Callable c = new StringTask();
            ecs.submit(c);
            delay(SHORT_DELAY_MS);
            for (;;) {
                Future f = ecs.poll();
                if (f != null) {
                    assertTrue(f.isDone());
                    break;
                }
            }
        } finally {
            joinPool(e);
        }
    }

    /**
     * If timed poll returns non-null, the returned task is completed
     */
    public void testPoll2() throws InterruptedException {
        ExecutorService e = Executors.newCachedThreadPool();
        ExecutorCompletionService ecs = new ExecutorCompletionService(e);
        try {
            assertNull(ecs.poll());
            Callable c = new StringTask();
            ecs.submit(c);
            Future f = ecs.poll(SHORT_DELAY_MS, MILLISECONDS);
            if (f != null)
                assertTrue(f.isDone());
        } finally {
            joinPool(e);
        }
    }

    /**
     * Submitting to underlying AES that overrides newTaskFor(Callable)
     * returns and eventually runs Future returned by newTaskFor.
     */
    public void testNewTaskForCallable() throws InterruptedException {
        final AtomicBoolean done = new AtomicBoolean(false);
        class MyCallableFuture extends FutureTask {
            MyCallableFuture(Callable c) { super(c); }
            protected void done() { done.set(true); }
        }
        ExecutorService e = new ThreadPoolExecutor(
                                 1, 1, 30L, TimeUnit.SECONDS,
                                 new ArrayBlockingQueue(1)) {
            protected  RunnableFuture newTaskFor(Callable c) {
                return new MyCallableFuture(c);
            }};
        ExecutorCompletionService ecs =
            new ExecutorCompletionService(e);
        try {
            assertNull(ecs.poll());
            Callable c = new StringTask();
            Future f1 = ecs.submit(c);
            assertTrue("submit must return MyCallableFuture",
                       f1 instanceof MyCallableFuture);
            Future f2 = ecs.take();
            assertSame("submit and take must return same objects", f1, f2);
            assertTrue("completed task must have set done", done.get());
        } finally {
            joinPool(e);
        }
    }

    /**
     * Submitting to underlying AES that overrides newTaskFor(Runnable,T)
     * returns and eventually runs Future returned by newTaskFor.
     */
    public void testNewTaskForRunnable() throws InterruptedException {
        final AtomicBoolean done = new AtomicBoolean(false);
        class MyRunnableFuture extends FutureTask {
            MyRunnableFuture(Runnable t, V r) { super(t, r); }
            protected void done() { done.set(true); }
        }
        ExecutorService e = new ThreadPoolExecutor(
                                 1, 1, 30L, TimeUnit.SECONDS,
                                 new ArrayBlockingQueue(1)) {
            protected  RunnableFuture newTaskFor(Runnable t, T r) {
                return new MyRunnableFuture(t, r);
            }};
        ExecutorCompletionService ecs =
            new ExecutorCompletionService(e);
        try {
            assertNull(ecs.poll());
            Runnable r = new NoOpRunnable();
            Future f1 = ecs.submit(r, null);
            assertTrue("submit must return MyRunnableFuture",
                       f1 instanceof MyRunnableFuture);
            Future f2 = ecs.take();
            assertSame("submit and take must return same objects", f1, f2);
            assertTrue("completed task must have set done", done.get());
        } finally {
            joinPool(e);
        }
    }

}