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Using GrowBeforeQueueThreadPoolExecutor as the threadPool
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GVRf/Framework/src/org/gearvrf/utility/GrowBeforeQueueThreadPoolExecutor.java
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|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| package org.gearvrf.utility; | ||
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| import java.util.concurrent.BlockingQueue; | ||
| import java.util.concurrent.LinkedBlockingQueue; | ||
| import java.util.concurrent.ThreadFactory; | ||
| import java.util.concurrent.ThreadPoolExecutor; | ||
| import java.util.concurrent.TimeUnit; | ||
| import java.util.concurrent.atomic.AtomicInteger; | ||
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| public class GrowBeforeQueueThreadPoolExecutor extends ThreadPoolExecutor { | ||
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| private static final int NUM_CPUS = Runtime.getRuntime().availableProcessors(); | ||
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| private int userSpecifiedCorePoolSize; | ||
| private int taskCount; | ||
| private Object syncObj = new Object(); | ||
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| public GrowBeforeQueueThreadPoolExecutor(final String prefix) { | ||
| this( | ||
| /* core size */Math.min(2, NUM_CPUS), | ||
| /* max size */Math.max(Math.min(2, NUM_CPUS), 2 * NUM_CPUS), | ||
| /* idle timeout */60, TimeUnit.SECONDS, | ||
| new LinkedBlockingQueue<Runnable>(), | ||
| new ThreadFactory() { | ||
| private final AtomicInteger threadNumber = new AtomicInteger(1); | ||
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| @Override | ||
| public final Thread newThread(final Runnable r) { | ||
| return new Thread(r, prefix + "-" + threadNumber.getAndIncrement()); | ||
| } | ||
| }); | ||
| } | ||
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| /*package*/ GrowBeforeQueueThreadPoolExecutor(int corePoolSize, int maximumPoolSize, | ||
| long keepAliveTime, TimeUnit unit, | ||
| BlockingQueue<Runnable> workQueue, | ||
| ThreadFactory threadFactory) { | ||
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| super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, threadFactory); | ||
| userSpecifiedCorePoolSize = corePoolSize; | ||
| } | ||
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| @Override | ||
| public void execute(Runnable runnable) { | ||
| synchronized (syncObj) { | ||
| taskCount++; | ||
| setCorePoolSizeToTaskCountWithinBounds(); | ||
| } | ||
| super.execute(runnable); | ||
| } | ||
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| @Override | ||
| protected void afterExecute(Runnable runnable, Throwable throwable) { | ||
| super.afterExecute(runnable, throwable); | ||
| synchronized (syncObj) { | ||
| taskCount--; | ||
| setCorePoolSizeToTaskCountWithinBounds(); | ||
| } | ||
| } | ||
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| private void setCorePoolSizeToTaskCountWithinBounds() { | ||
| int threads = taskCount; | ||
| if (threads < userSpecifiedCorePoolSize) { | ||
| threads = userSpecifiedCorePoolSize; | ||
| } | ||
| if (threads > getMaximumPoolSize()) { | ||
| threads = getMaximumPoolSize(); | ||
| } | ||
| setCorePoolSize(threads); | ||
| } | ||
| } |
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