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2010-06-01T06:58:24Z

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в 18:01, 31 мая 2010

2010-05-31T18:01:46Z

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== 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>

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Admin: 1 версия

в 18:01, 31 мая 2010