/*
* JORAM: Java(TM) Open Reliable Asynchronous Messaging
* Copyright (C) 2007 ScalAgent Distributed Technologies
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA.
*
* Initial developer(s): BADOLLE Fabien ( ScalAgent Distributed Technologies )
* Contributor(s):
*/
package connector;
import javax.resource.spi.work.ExecutionContext;
import javax.resource.spi.work.Work;
import javax.resource.spi.work.WorkException;
import javax.resource.spi.work.WorkListener;
import javax.resource.spi.work.WorkManager;
import java.util.LinkedList;
public class JWorkManager implements WorkManager {
protected LinkedList workList = new LinkedList();
protected static int poolnumber = 0;
protected static int threadnumber = 0;
protected int maxpoolsz;
protected int minpoolsz;
protected int poolsz; // current size of thread pool
protected int freeThreads; // free threads ready to work
protected long waitingTime; // in millisec
protected boolean valid = true; // set to false when WorkManager is removed.
protected static final long FEW_MORE_SECONDS = 3000;
public JWorkManager(int minsz, int maxsz, long threadwait) {
minpoolsz = minsz;
maxpoolsz = maxsz;
waitingTime = threadwait * 1000L;
poolnumber++;
for (poolsz = 0; poolsz < minsz; poolsz++) {
PoolThread pt = new PoolThread(this, threadnumber++, poolnumber);
pt.start();
}
}
public void doWork(Work work) throws WorkException {
}
public void doWork(Work work, long timeout, ExecutionContext ectx, WorkListener listener) throws WorkException {
work.run();
}
public long startWork(Work work) throws WorkException {
return 0;
}
public long startWork(Work work, long timeout, ExecutionContext ectx, WorkListener listener) throws WorkException {
return 0;
}
public void scheduleWork(Work work) throws WorkException {
scheduleWork(work, INDEFINITE, null, null);
}
public void scheduleWork(final Work work, long timeout, ExecutionContext ectx, WorkListener listener) throws WorkException {
synchronized (workList) {
workList.add(work);
if (poolsz < maxpoolsz && workList.size() > freeThreads) {
poolsz++;
PoolThread pt = new PoolThread(this, threadnumber++, poolnumber);
pt.start();
} else {
workList.notify();
}
}
}
class PoolThread extends Thread {
private JWorkManager mgr;
private int number;
PoolThread(JWorkManager m, int num, int wm) {
mgr = m;
number = num;
setName("PoolThread-" + wm + "/" + num);
}
public void run() {
while (true) {
try {
Work run = null;
boolean haswait = false;
synchronized (workList) {
while (workList.isEmpty()) {
if ((haswait && freeThreads > minpoolsz) || !valid) {
poolsz--;
throw new InterruptedException("Thread ending");
}
try {
freeThreads++;
workList.wait(waitingTime);
freeThreads--;
haswait = true;
} catch (InterruptedException e) {
freeThreads--;
poolsz--;
throw e;
}
}
run = (Work) workList.removeFirst();
workList.notify();
doWork(run,INDEFINITE , null,null);
}
} catch (InterruptedException e) {
System.out.println("InterruptedException");
return;
} catch (WorkException e) {
System.out.println("WorkException");
}
}
}
}
}