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Java example source code file (TestWaitingThread.java)

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

Java tags/keywords

awaitthread, condition, httphost, httproute, illegalstateexception, interruptedexception, lock, reentrantlock, routespecificpool, string, target, testcase, testwaitingthread, waitingthread

The TestWaitingThread.java example source code

/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.http.impl.conn.tsccm;

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

import org.apache.http.HttpHost;
import org.apache.http.conn.routing.HttpRoute;



/**
 * Tests for <code>WaitingThread.
 */
public class TestWaitingThread extends TestCase {

    public final static
        HttpHost TARGET = new HttpHost("target.test.invalid");


    public TestWaitingThread(String testName) {
        super(testName);
    }

    public static void main(String args[]) {
        String[] testCaseName = { TestWaitingThread.class.getName() };
        junit.textui.TestRunner.main(testCaseName);
    }

    public static Test suite() {
        return new TestSuite(TestWaitingThread.class);
    }


    public void testConstructor() {
        try {
            new WaitingThread(null, null);
            fail("null condition not detected");
        } catch (IllegalArgumentException iax) {
            // expected
        }

        Lock      lck = new ReentrantLock();
        Condition cnd = lck.newCondition();

        WaitingThread wt = new WaitingThread(cnd, null);
        assertEquals("wrong condition", cnd, wt.getCondition());
        assertNull  ("pool from nowhere", wt.getPool());
        assertNull  ("thread from nowhere", wt.getThread());

        HttpRoute         route = new HttpRoute(TARGET);
        RouteSpecificPool rospl = new RouteSpecificPool(route, 10);
        wt = new WaitingThread(cnd, rospl);
        assertEquals("wrong condition", cnd, wt.getCondition());
        assertEquals("wrong pool", rospl, wt.getPool());
        assertNull  ("thread from nowhere", wt.getThread());
    }


    public void testAwaitWakeup() throws InterruptedException {

        Lock      lck = new ReentrantLock();
        Condition cnd = lck.newCondition();
        WaitingThread wt = new WaitingThread(cnd, null);

        AwaitThread ath = new AwaitThread(wt, lck, null);
        ath.start();
        Thread.sleep(100); // give extra thread time to block

        assertNull("thread caught exception", ath.getException());
        assertTrue("thread not waiting", ath.isWaiting());
        assertEquals("wrong thread", ath, wt.getThread());

        Thread.sleep(500); // just for fun, let it wait for some time
        // this may fail due to a spurious wakeup
        assertTrue("thread not waiting, spurious wakeup?", ath.isWaiting());

        try {
            lck.lock();
            wt.wakeup();
        } finally {
            lck.unlock();
        }
        ath.join(10000);

        assertFalse("thread still waiting", ath.isWaiting());
        assertNull("thread caught exception", ath.getException());
        assertNull("thread still there", wt.getThread());
    }


    public void testInterrupt() throws InterruptedException {

        Lock      lck = new ReentrantLock();
        Condition cnd = lck.newCondition();
        WaitingThread wt = new WaitingThread(cnd, null);

        AwaitThread ath = new AwaitThread(wt, lck, null);
        ath.start();
        Thread.sleep(100); // give extra thread time to block

        assertNull("thread caught exception", ath.getException());
        assertTrue("thread not waiting", ath.isWaiting());
        assertEquals("wrong thread", ath, wt.getThread());

        ath.interrupt();
        Thread.sleep(100); // give extra thread time to wake up

        assertFalse("thread still waiting", ath.isWaiting());
        assertNotNull("thread didn't catch exception", ath.getException());
        assertTrue("thread caught wrong exception",
                   ath.getException() instanceof InterruptedException);
        assertNull("thread still there", wt.getThread());
    }


    public void testIllegal() throws InterruptedException {

        Lock      lck = new ReentrantLock();
        Condition cnd = lck.newCondition();
        WaitingThread wt = new WaitingThread(cnd, null);

        try {
            lck.lock();
            wt.wakeup();
            fail("missing waiter not detected");
        } catch (IllegalStateException isx) {
            // expected
        } finally {
            lck.unlock();
        }

        AwaitThread ath1 = new AwaitThread(wt, lck, null);
        ath1.start();
        Thread.sleep(100); // give extra thread time to block

        assertNull("thread caught exception", ath1.getException());
        assertTrue("thread not waiting", ath1.isWaiting());
        assertEquals("wrong thread", ath1, wt.getThread());

        AwaitThread ath2 = new AwaitThread(wt, lck, null);
        ath2.start();
        Thread.sleep(100); // give extra thread time to try to block

        assertFalse("thread waiting", ath2.isWaiting());
        assertNotNull("thread didn't catch exception", ath2.getException());
        assertTrue("thread caught wrong exception",
                   ath2.getException() instanceof IllegalStateException);

        // clean up by letting the threads terminate
        ath1.interrupt();
        ath2.interrupt();
    }


} // class TestWaitingThread

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