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pooling test using StackObjectPool based on http://stackoverflow.com/a/13914445/233906

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gistfile1.java
Java
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import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
 
import org.apache.commons.pool.BasePoolableObjectFactory;
import org.apache.commons.pool.PoolableObjectFactory;
import org.apache.commons.pool.impl.StackObjectPool;
 
public class Share {
 
private static final int NB_LOOPS = 100000;
final static int NB_THREADS = 100;
private static PoolableObjectFactory<MessageDigest> factory = new BasePoolableObjectFactory<MessageDigest>() {
 
/*
* (non-Javadoc)
*
* @see org.apache.commons.pool.BasePoolableObjectFactory#makeObject ()
*/
@Override
public MessageDigest makeObject() throws Exception {
return MessageDigest.getInstance("MD5");
}
 
};
final byte[] bytes = new byte[100];
final ExecutorService pool;
final static StackObjectPool<MessageDigest> mdPool = new StackObjectPool<MessageDigest>(
factory);
static final AtomicLong grandTotal = new AtomicLong(0);
 
Share() throws NoSuchAlgorithmException {
pool = Executors.newFixedThreadPool(NB_THREADS);
}
 
void go() {
 
for (int i = 0; i < NB_THREADS; i++) {
pool.execute(new Runnable() {
public void run() {
long start = System.currentTimeMillis();
for (int i = 0; i < NB_LOOPS; i++) {
MessageDigest digest = null;
try {
digest = mdPool.borrowObject();
digest.update(bytes);
digest.digest();
} catch (Exception ex) {
ex.printStackTrace();
} finally {
try {
mdPool.returnObject(digest);
} catch (Exception e) {
e.printStackTrace();
}
}
Thread.yield();
}// fin for
long end = System.currentTimeMillis();
System.out.println(end - start);
grandTotal.addAndGet(end - start);
pool.shutdown();
}
});
}
 
}
 
public static void main(String[] args) throws Exception {
startStatThread();
Share share = new Share();
share.go();
share.pool.awaitTermination(Long.MAX_VALUE, TimeUnit.DAYS);
System.out.println(grandTotal.get() + " ms");
System.out.println(TimeUnit.MILLISECONDS.toSeconds(grandTotal.get())
+ " s");
printPoolStatus();
}
 
/**
*
*/
private static void startStatThread() {
Thread thread = new Thread("PoolStats") {
 
/*
* (non-Javadoc)
*
* @see java.lang.Thread#run()
*/
@Override
public void run() {
while (true) {
printPoolStatus();
try {
TimeUnit.SECONDS.sleep(1);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
 
};
thread.setDaemon(true);
thread.start();
}
 
/**
*
*/
private static void printPoolStatus() {
int numIdle;
int numActive;
synchronized (mdPool) {
numActive = mdPool.getNumActive();
numIdle = mdPool.getNumIdle();
}
System.out.println("active = " + numActive);
System.out.println("idle = " + numIdle);
}
}

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