public
Created

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

  • Download Gist
gistfile1.java
Java
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129
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.GenericObjectPool;
 
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 GenericObjectPool<MessageDigest> mdPool = new GenericObjectPool<MessageDigest>(
factory);
static {
mdPool.setWhenExhaustedAction(GenericObjectPool.WHEN_EXHAUSTED_GROW);
}
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);
}
}

Please sign in to comment on this gist.

Something went wrong with that request. Please try again.