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// --- BEGIN COPYRIGHT BLOCK ---
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; version 2 of the License.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2007 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package com.netscape.cms.request;
import java.io.IOException;
import java.io.NotSerializableException;
import java.io.ObjectStreamException;
import java.io.Serializable;
import java.io.ByteArrayOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.math.BigInteger;
import java.util.Date;
import java.util.Enumeration;
import java.util.Vector;
import java.util.Hashtable;
import com.netscape.certsrv.base.EBaseException;
import com.netscape.certsrv.request.IRequest;
import com.netscape.certsrv.request.IRequestScheduler;
/**
* This class represents a request scheduler that prioritizes
* the threads based on the request processing order.
* The request that enters the request queue first should
* be processed first.
*
* @version $Revision$, $Date$
*/
public class RequestScheduler implements IRequestScheduler {
private Vector mRequestThreads = new Vector();
/**
* Request entered the request queue processing.
*
* @param r request
*/
public synchronized void requestIn(IRequest r) {
Thread current = Thread.currentThread();
if (mRequestThreads.size() == 0) {
current.setPriority(Thread.MAX_PRIORITY);
}
mRequestThreads.addElement(current);
}
/**
* Request exited the request queue processing.
*
* @param r request
*/
public synchronized void requestOut(IRequest r) {
Thread current = Thread.currentThread();
Thread first = (Thread) mRequestThreads.elementAt(0);
if (current.equals(first)) {
// reprioritize
try {
Thread second = (Thread) mRequestThreads.elementAt(1);
second.setPriority(Thread.MAX_PRIORITY);
} catch (Exception e) {
// no second element; nothing to do
}
}
mRequestThreads.removeElement(current);
}
}
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