Android example source code file (MonitorTest.java)

This example Android source code file (MonitorTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, boolean, illegalargumentexception, interruptedexception, interrupter, interrupttest, mediumtest, num_workers, object, runtimeexception, test, thread, throwable, unexpected, waiter, worker

The MonitorTest.java Android example source code

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.core;

import junit.framework.TestCase;
import android.test.suitebuilder.annotation.MediumTest;
import android.test.suitebuilder.annotation.LargeTest;
import android.test.suitebuilder.annotation.SmallTest;

public class MonitorTest extends TestCase {

    @MediumTest
    public void testWaitArgumentsTest() throws Exception {
            /* Try some valid arguments.  These should all
             * return very quickly.
             */
            try {
                synchronized (this) {
                    /* millisecond version */
                    wait(1);
                    wait(10);

                    /* millisecond + nanosecond version */
                    wait(0, 1);
                    wait(0, 999999);
                    wait(1, 1);
                    wait(1, 999999);
                }
            } catch (InterruptedException ex) {
                throw new RuntimeException("good Object.wait() interrupted",
                        ex);
            } catch (Exception ex) {
                throw new RuntimeException("Unexpected exception when calling" +
                        "Object.wait() with good arguments", ex);
            }

            /* Try some invalid arguments.
             */
            boolean sawException = false;
            try {
                synchronized (this) {
                    wait(-1);
                }
            } catch (InterruptedException ex) {
                throw new RuntimeException("bad Object.wait() interrupted", ex);
            } catch (IllegalArgumentException ex) {
                sawException = true;
            } catch (Exception ex) {
                throw new RuntimeException("Unexpected exception when calling" +
                        "Object.wait() with bad arguments", ex);
            }
            if (!sawException) {
                throw new RuntimeException("bad call to Object.wait() should " +
                        "have thrown IllegalArgumentException");
            }

            sawException = false;
            try {
                synchronized (this) {
                    wait(0, -1);
                }
            } catch (InterruptedException ex) {
                throw new RuntimeException("bad Object.wait() interrupted", ex);
            } catch (IllegalArgumentException ex) {
                sawException = true;
            } catch (Exception ex) {
                throw new RuntimeException("Unexpected exception when calling" +
                        "Object.wait() with bad arguments", ex);
            }
            if (!sawException) {
                throw new RuntimeException("bad call to Object.wait() should " +
                        "have thrown IllegalArgumentException");
            }

            sawException = false;
            try {
                synchronized (this) {
                    /* The legal range of nanos is 0-999999. */
                    wait(0, 1000000);
                }
            } catch (InterruptedException ex) {
                throw new RuntimeException("bad Object.wait() interrupted", ex);
            } catch (IllegalArgumentException ex) {
                sawException = true;
            } catch (Exception ex) {
                throw new RuntimeException("Unexpected exception when calling" +
                        "Object.wait() with bad arguments", ex);
            }
            if (!sawException) {
                throw new RuntimeException("bad call to Object.wait() should " +
                        "have thrown IllegalArgumentException");
            }
    }

    private class Interrupter extends Thread {
            Waiter waiter;

            Interrupter(String name, Waiter waiter) {
                super(name);
                this.waiter = waiter;
            }

            public void run() {
                try {
                    run_inner();
                } catch (Throwable t) {
                    MonitorTest.errorException = t;
                    MonitorTest.testThread.interrupt();
                }
            }

            void run_inner() {
                waiter.spin = true;
                // System.out.println("InterruptTest: starting waiter");
                waiter.start();

                try {
                    Thread.currentThread().sleep(500);
                } catch (InterruptedException ex) {
                    throw new RuntimeException("Test sleep interrupted.", ex);
                }

                /* Waiter is spinning, and its monitor should still be thin.
                 */
                // System.out.println("Test interrupting waiter");
                waiter.interrupt();
                waiter.spin = false;

                for (int i = 0; i < 3; i++) {
                    /* Wait for the waiter to start waiting.
                     */
                    synchronized (waiter.interrupterLock) {
                        try {
                            waiter.interrupterLock.wait();
                        } catch (InterruptedException ex) {
                            throw new RuntimeException("Test wait interrupted.", ex);
                        }
                    }

                    /* Before interrupting, grab the waiter lock, which
                     * guarantees that the waiter is already sitting in wait().
                     */
                    synchronized (waiter) {
                        //System.out.println("Test interrupting waiter (" + i + ")");
                        waiter.interrupt();
                    }
                }

                // System.out.println("Test waiting for waiter to die.");
                try {
                    waiter.join();
                } catch (InterruptedException ex) {
                    throw new RuntimeException("Test join interrupted.", ex);
                }
                // System.out.println("InterruptTest done.");
            }
        }

    private class Waiter extends Thread {
            Object interrupterLock = new Object();
            Boolean spin = false;

            Waiter(String name) {
                super(name);
            }

            public void run() {
                try {
                    run_inner();
                } catch (Throwable t) {
                    MonitorTest.errorException = t;
                    MonitorTest.testThread.interrupt();
                }
            }

            void run_inner() {
                // System.out.println("Waiter spinning");
                while (spin) {
                    // We're going to get interrupted while we spin.
                }
                if (interrupted()) {
                    // System.out.println("Waiter done spinning; interrupted.");
                } else {
                    throw new RuntimeException("Thread not interrupted " +
                                               "during spin");
                }

                synchronized (this) {
                    Boolean sawEx = false;

                    try {
                        synchronized (interrupterLock) {
                            interrupterLock.notify();
                        }
                        // System.out.println("Waiter calling wait()");
                        this.wait();
                    } catch (InterruptedException ex) {
                        sawEx = true;
                        // System.out.println("wait(): Waiter caught " + ex);
                    }
                    // System.out.println("wait() finished");

                    if (!sawEx) {
                        throw new RuntimeException("Thread not interrupted " +
                                                   "during wait()");
                    }
                }
                synchronized (this) {
                    Boolean sawEx = false;

                    try {
                        synchronized (interrupterLock) {
                            interrupterLock.notify();
                        }
                        // System.out.println("Waiter calling wait(1000)");
                        this.wait(1000);
                    } catch (InterruptedException ex) {
                        sawEx = true;
                        // System.out.println("wait(1000): Waiter caught " + ex);
                    }
                    // System.out.println("wait(1000) finished");

                    if (!sawEx) {
                        throw new RuntimeException("Thread not interrupted " +
                                                   "during wait(1000)");
                    }
                }
                synchronized (this) {
                    Boolean sawEx = false;

                    try {
                        synchronized (interrupterLock) {
                            interrupterLock.notify();
                        }
                        // System.out.println("Waiter calling wait(1000, 5000)");
                        this.wait(1000, 5000);
                    } catch (InterruptedException ex) {
                        sawEx = true;
                        // System.out.println("wait(1000, 5000): Waiter caught " + ex);
                    }
                    // System.out.println("wait(1000, 5000) finished");

                    if (!sawEx) {
                        throw new RuntimeException("Thread not interrupted " +
                                                   "during wait(1000, 5000)");
                    }
                }

               //  System.out.println("Waiter returning");
            }
        }

    private static Throwable errorException;
    private static Thread testThread;

    // TODO: Flaky test. Add back MediumTest annotation once fixed
    public void testInterruptTest() throws Exception {


            testThread = Thread.currentThread();
            errorException = null;

            Waiter waiter = new Waiter("InterruptTest Waiter");
            Interrupter interrupter =
                    new Interrupter("InterruptTest Interrupter", waiter);
            interrupter.start();

            try {
                interrupter.join();
                waiter.join();
            } catch (InterruptedException ex) {
                throw new RuntimeException("Test join interrupted.", ex);
            }

            if (errorException != null) {
                throw new RuntimeException("InterruptTest failed",
                                           errorException);
            }




    }

     private static void deepWait(int depth, Object lock) {
            synchronized (lock) {
                if (depth > 0) {
                    deepWait(depth - 1, lock);
                } else {
                    String threadName = Thread.currentThread().getName();
                    try {
                        // System.out.println(threadName + " waiting");
                        lock.wait();
                        // System.out.println(threadName + " done waiting");
                    } catch (InterruptedException ex) {
                        // System.out.println(threadName + " interrupted.");
                    }
                }
            }
        }

        private class Worker extends Thread {
            Object lock;
            int id;

            Worker(int id, Object lock) {
                super("Worker(" + id + ")");
                this.id = id;
                this.lock = lock;
            }

            public void run() {
                int iterations = 0;

                while (MonitorTest.running) {
                    MonitorTest.deepWait(id, lock);
                    iterations++;
                }
                // System.out.println(getName() + " done after " + iterations + " iterations.");
            }
        }

    private static Object commonLock = new Object();
        private static Boolean running = false;


    @LargeTest
    public void testNestedMonitors() throws Exception {
        final int NUM_WORKERS = 5;

            Worker w[] = new Worker[NUM_WORKERS];
            int i;

            for (i = 0; i < NUM_WORKERS; i++) {
                w[i] = new Worker(i * 2 - 1, new Object());
            }

            running = true;

            // System.out.println("NestedMonitors: starting workers");
            for (i = 0; i < NUM_WORKERS; i++) {
                w[i].start();
            }

            try {
                Thread.currentThread().sleep(1000);
            } catch (InterruptedException ex) {
               // System.out.println("Test sleep interrupted.");
            }

            for (i = 0; i < 100; i++) {
                for (int j = 0; j < NUM_WORKERS; j++) {
                    synchronized (w[j].lock) {
                        w[j].lock.notify();
                    }
                }
            }

            // System.out.println("NesterMonitors: stopping workers");
            running = false;
            for (i = 0; i < NUM_WORKERS; i++) {
                synchronized (w[i].lock) {
                    w[i].lock.notifyAll();
                }
            }
    }

    private static class CompareAndExchange extends Thread {
        static Object toggleLock = null;
        static int toggle = -1;
        static Boolean running = false;

        public void run() {
            toggleLock = new Object();
            toggle = -1;

            Worker w1 = new Worker(0, 1);
            Worker w2 = new Worker(2, 3);
            Worker w3 = new Worker(4, 5);
            Worker w4 = new Worker(6, 7);

            running = true;

            // System.out.println("CompareAndExchange: starting workers");

            w1.start();
            w2.start();
            w3.start();
            w4.start();

            try {
                this.sleep(10000);
            } catch (InterruptedException ex) {
                // System.out.println(getName() + " interrupted.");
            }

            // System.out.println("MonitorTest: stopping workers");
            running = false;

            toggleLock = null;
        }

        class Worker extends Thread {
            int i1;
            int i2;

            Worker(int i1, int i2) {
                super("Worker(" + i1 + ", " + i2 + ")");
                this.i1 = i1;
                this.i2 = i2;
            }

            public void run() {
                int iterations = 0;

                /* Latch this because run() may set the static field to
                 * null at some point.
                 */
                Object toggleLock = CompareAndExchange.toggleLock;

                // System.out.println(getName() + " running");
                try {
                    while (CompareAndExchange.running) {
                        synchronized (toggleLock) {
                            int test;
                            int check;

                            if (CompareAndExchange.toggle == i1) {
                                this.sleep(5 + i2);
                                CompareAndExchange.toggle = test = i2;
                            } else {
                                this.sleep(5 + i1);
                                CompareAndExchange.toggle = test = i1;
                            }
                            if ((check = CompareAndExchange.toggle) != test) {
//                                System.out.println("Worker(" + i1 + ", " +
//                                                   i2 + ") " + "test " + test +
//                                                   " != toggle " + check);
                                throw new RuntimeException(
                                        "locked value changed");
                            }
                        }

                        iterations++;
                    }
                } catch (InterruptedException ex) {
                   // System.out.println(getName() + " interrupted.");
                }

//                System.out.println(getName() + " done after " +
//                                   iterations + " iterations.");
            }
        }
    }
}