Java/Threads/CountDownLatch — различия между версиями
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Текущая версия на 09:58, 1 июня 2010
An example of CountDownLatch.
<source lang="java">
import java.util.concurrent.CountDownLatch;
public class CDLDemo {
public static void main(String args[]) { CountDownLatch cdl = new CountDownLatch(5); new MyThread(cdl); try { cdl.await(); } catch (InterruptedException exc) { System.out.println(exc); } System.out.println("Done"); }
}
class MyThread implements Runnable {
CountDownLatch latch; MyThread(CountDownLatch c) { latch = c; new Thread(this).start(); } public void run() { for(int i = 0; i<5; i++) { System.out.println(i); latch.countDown(); // decrement count } }
}
</source>
Count Up Down Latch
<source lang="java">
/* Copyright (c) 2001-2009, The HSQL Development Group
* All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * Neither the name of the HSQL Development Group nor the names of its * contributors may be used to endorse or promote products derived from this * software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG, * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
import java.util.concurrent.CountDownLatch; public class CountUpDownLatch {
CountDownLatch latch; int count; public CountUpDownLatch() { latch = new CountDownLatch(1); this.count = count; } public void await() throws InterruptedException { if (count == 0) { return; } latch.await(); } public void countDown() { count--; if (count == 0) { latch.countDown(); } } public long getCount() { return count; } public void countUp() { if (latch.getCount() == 0) { latch = new CountDownLatch(1); } count++; } public void setCount(int count) { if (count == 0) { if (latch.getCount() != 0) { latch.countDown(); } } else if (latch.getCount() == 0) { latch = new CountDownLatch(1); } this.count = count; }
}
</source>