executorstest.java

来自「SRI international 发布的OAA框架软件」· Java 代码 · 共 667 行 · 第 1/2 页

/*
 * 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/licenses/publicdomain
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */


import junit.framework.*;
import edu.emory.mathcs.backport.java.util.*;
import edu.emory.mathcs.backport.java.util.concurrent.*;
import java.math.BigInteger;
import java.security.*;
import java.util.*;

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

    static class TimedCallable implements Callable {
        private final ExecutorService exec;
        private final Callable func;
        private final long msecs;

        TimedCallable(ExecutorService exec, Callable func, long msecs) {
            this.exec = exec;
            this.func = func;
            this.msecs = msecs;
        }

        public Object call() throws Exception {
            Future ftask = exec.submit(func);
            try {
                return ftask.get(msecs, TimeUnit.MILLISECONDS);
            } finally {
                ftask.cancel(true);
            }
        }
    }


    private static class Fib implements Callable {
        private final BigInteger n;
        Fib(long n) {
            if (n < 0) throw new IllegalArgumentException("need non-negative arg, but got " + n);
            this.n = BigInteger.valueOf(n);
        }
        public Object call() {
            BigInteger f1 = BigInteger.ONE;
            BigInteger f2 = f1;
            for (BigInteger i = BigInteger.ZERO; i.compareTo(n) < 0; i = i.add(BigInteger.ONE)) {
                BigInteger t = f1.add(f2);
                f1 = f2;
                f2 = t;
            }
            return f1;
        }
    };

    /**
     * A newCachedThreadPool can execute runnables
     */
    public void testNewCachedThreadPool1() {
        ExecutorService e = Executors.newCachedThreadPool();
        e.execute(new NoOpRunnable());
        e.execute(new NoOpRunnable());
        e.execute(new NoOpRunnable());
        joinPool(e);
    }

    /**
     * A newCachedThreadPool with given ThreadFactory can execute runnables
     */
    public void testNewCachedThreadPool2() {
        ExecutorService e = Executors.newCachedThreadPool(new SimpleThreadFactory());
        e.execute(new NoOpRunnable());
        e.execute(new NoOpRunnable());
        e.execute(new NoOpRunnable());
        joinPool(e);
    }

    /**
     * A newCachedThreadPool with null ThreadFactory throws NPE
     */
    public void testNewCachedThreadPool3() {
        try {
            ExecutorService e = Executors.newCachedThreadPool(null);
            shouldThrow();
        }
        catch(NullPointerException success) {
        }
    }


    /**
     * A new SingleThreadExecutor can execute runnables
     */
    public void testNewSingleThreadExecutor1() {
        ExecutorService e = Executors.newSingleThreadExecutor();
        e.execute(new NoOpRunnable());
        e.execute(new NoOpRunnable());
        e.execute(new NoOpRunnable());
        joinPool(e);
    }

    /**
     * A new SingleThreadExecutor with given ThreadFactory can execute runnables
     */
    public void testNewSingleThreadExecutor2() {
        ExecutorService e = Executors.newSingleThreadExecutor(new SimpleThreadFactory());
        e.execute(new NoOpRunnable());
        e.execute(new NoOpRunnable());
        e.execute(new NoOpRunnable());
        joinPool(e);
    }

    /**
     * A new SingleThreadExecutor with null ThreadFactory throws NPE
     */
    public void testNewSingleThreadExecutor3() {
        try {
            ExecutorService e = Executors.newSingleThreadExecutor(null);
            shouldThrow();
        }
        catch(NullPointerException success) {
        }
    }

    /**
     * A new SingleThreadExecutor cannot be casted to concrete implementation
     */
    public void testCastNewSingleThreadExecutor() {
        ExecutorService e = Executors.newSingleThreadExecutor();
        try {
            ThreadPoolExecutor tpe = (ThreadPoolExecutor)e;
        } catch (ClassCastException success) {
        } finally {
            joinPool(e);
        }
    }


    /**
     * A new newFixedThreadPool can execute runnables
     */
    public void testNewFixedThreadPool1() {
        ExecutorService e = Executors.newFixedThreadPool(2);
        e.execute(new NoOpRunnable());
        e.execute(new NoOpRunnable());
        e.execute(new NoOpRunnable());
        joinPool(e);
    }

    /**
     * A new newFixedThreadPool with given ThreadFactory can execute runnables
     */
    public void testNewFixedThreadPool2() {
        ExecutorService e = Executors.newFixedThreadPool(2, new SimpleThreadFactory());
        e.execute(new NoOpRunnable());
        e.execute(new NoOpRunnable());
        e.execute(new NoOpRunnable());
        joinPool(e);
    }

    /**
     * A new newFixedThreadPool with null ThreadFactory throws NPE
     */
    public void testNewFixedThreadPool3() {
        try {
            ExecutorService e = Executors.newFixedThreadPool(2, null);
            shouldThrow();
        }
        catch(NullPointerException success) {
        }
    }

    /**
     * A new newFixedThreadPool with 0 threads throws IAE
     */
    public void testNewFixedThreadPool4() {
        try {
            ExecutorService e = Executors.newFixedThreadPool(0);
            shouldThrow();
        }
        catch(IllegalArgumentException success) {
        }
    }


    /**
     * An unconfigurable newFixedThreadPool can execute runnables
     */
    public void testunconfigurableExecutorService() {
        ExecutorService e = Executors.unconfigurableExecutorService(Executors.newFixedThreadPool(2));
        e.execute(new NoOpRunnable());
        e.execute(new NoOpRunnable());
        e.execute(new NoOpRunnable());
        joinPool(e);
    }

    /**
     * unconfigurableExecutorService(null) throws NPE
     */
    public void testunconfigurableExecutorServiceNPE() {
        try {
            ExecutorService e = Executors.unconfigurableExecutorService(null);
        }
        catch (NullPointerException success) {
        }
    }

    /**
     * unconfigurableScheduledExecutorService(null) throws NPE
     */
    public void testunconfigurableScheduledExecutorServiceNPE() {
        try {
            ExecutorService e = Executors.unconfigurableScheduledExecutorService(null);
        }
        catch (NullPointerException success) {
        }
    }


    /**
     * a newSingleThreadScheduledExecutor successfully runs delayed task
     */
    public void testNewSingleThreadScheduledExecutor() {
	try {
            TrackedCallable callable = new TrackedCallable();
            ScheduledExecutorService p1 = Executors.newSingleThreadScheduledExecutor();
	    Future f = p1.schedule(callable, SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
	    assertFalse(callable.done);
	    Thread.sleep(MEDIUM_DELAY_MS);
	    assertTrue(callable.done);
	    assertEquals(Boolean.TRUE, f.get());
            joinPool(p1);
	} catch(RejectedExecutionException e){}
	catch(Exception e){
            e.printStackTrace();
            unexpectedException();
        }
    }

    /**
     * a newScheduledThreadPool successfully runs delayed task
     */
    public void testnewScheduledThreadPool() {
	try {
            TrackedCallable callable = new TrackedCallable();
            ScheduledExecutorService p1 = Executors.newScheduledThreadPool(2);
	    Future f = p1.schedule(callable, SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
	    assertFalse(callable.done);
	    Thread.sleep(MEDIUM_DELAY_MS);
	    assertTrue(callable.done);
	    assertEquals(Boolean.TRUE, f.get());
            joinPool(p1);
	} catch(RejectedExecutionException e){}
	catch(Exception e){
            e.printStackTrace();
            unexpectedException();
        }
    }

    /**
     * an unconfigurable  newScheduledThreadPool successfully runs delayed task
     */
    public void testunconfigurableScheduledExecutorService() {
	try {
            TrackedCallable callable = new TrackedCallable();
            ScheduledExecutorService p1 = Executors.unconfigurableScheduledExecutorService(Executors.newScheduledThreadPool(2));
	    Future f = p1.schedule(callable, SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
	    assertFalse(callable.done);
	    Thread.sleep(MEDIUM_DELAY_MS);
	    assertTrue(callable.done);
	    assertEquals(Boolean.TRUE, f.get());
            joinPool(p1);
	} catch(RejectedExecutionException e){}
	catch(Exception e){
            e.printStackTrace();
            unexpectedException();
        }
    }

    /**
     *  timeouts from execute will time out if they compute too long.
     */
    public void testTimedCallable() {
        int N = 10000;
        ExecutorService executor = Executors.newSingleThreadExecutor();
        List tasks = new ArrayList(N);
        try {
            long startTime = System.currentTimeMillis();

            long i = 0;
            while (tasks.size() < N) {
                tasks.add(new TimedCallable(executor, new Fib(i), 1));
                i += 10;
            }

            int iters = 0;
            BigInteger sum = BigInteger.ZERO;
            for (Iterator it = tasks.iterator(); it.hasNext();) {
                try {
                    ++iters;
                    sum = sum.add((BigInteger)((Callable)it.next()).call());
                }
                catch (TimeoutException success) {
                    assertTrue(iters > 0);
                    return;
                }
                catch (Exception e) {
                    unexpectedException();
                }
            }
            // if by chance we didn't ever time out, total time must be small
            long elapsed = System.currentTimeMillis() - startTime;
            assertTrue(elapsed < N);
        }
        finally {
            joinPool(executor);
        }
    }


    /**
     * ThreadPoolExecutor using defaultThreadFactory has
     * specified group, priority, daemon status, and name
     */
    public void testDefaultThreadFactory() {