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// InstantBusyThread.java
// -----------------------
// (C) by Michael Peter Christen; mc@yacy.net
// first published on http://www.anomic.de
// Frankfurt, Germany, 2005
//
// $LastChangedDate$
// $LastChangedRevision$
// $LastChangedBy$
//
// 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; either version 2 of the License, or
// (at your option) any later version.
//
// 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package net.yacy.kelondro.workflow;
import java.util.TreeMap;
import net.yacy.cora.util.ConcurrentLog;
public abstract class InstantBusyThread extends AbstractBusyThread implements BusyThread {
private final Long handle;
private static final TreeMap<Long, String> jobs = new TreeMap<Long, String>();
/**
* @param idleSleep defines min idle sleep time that can be set via setIdleSleep()
* @param busySleep defines min busy sleep time that can be set via setBusySleep()
*/
public InstantBusyThread(final long idleSleep, final long busySleep) {
this("InstantBusyThread.job", idleSleep, busySleep);
}
/**
* @param jobName the job name used to monitor the thread
* @param idleSleep defines min idle sleep time that can be set via setIdleSleep()
* @param busySleep defines min busy sleep time that can be set via setBusySleep()
*/
public InstantBusyThread(final String jobName, final long idleSleep, final long busySleep) {
super(idleSleep, busySleep);
setName("BusyThread " + jobName);
this.handle = Long.valueOf(System.currentTimeMillis() + getName().hashCode());
}
@Override
public boolean job() throws Exception {
//System.out.println("started job " + this.handle + ": " + this.getName());
synchronized(jobs) {jobs.put(this.handle, getName());}
boolean jobHasDoneSomething = false;
try {
jobHasDoneSomething = jobImpl();
} catch (final IllegalArgumentException e) {
ConcurrentLog.severe("BUSYTHREAD", "Internal Error in InstantBusyThread.job: " + e.getMessage());
ConcurrentLog.severe("BUSYTHREAD", "shutting down thread '" + getName() + "'");
terminate(false);
} catch (final OutOfMemoryError e) {
ConcurrentLog.severe("BUSYTHREAD", "OutOfMemory Error in InstantBusyThread.job, thread '" + getName() + "': " + e.getMessage());
ConcurrentLog.logException(e);
freemem();
} catch (final Exception e) {
ConcurrentLog.severe("BUSYTHREAD", "Generic Exception, thread '" + getName() + "': " + e.getMessage());
ConcurrentLog.logException(e);
}
synchronized(jobs) {jobs.remove(this.handle);}
return jobHasDoneSomething;
}
/**
* The job's main logic implementation
* @return true if it has done something, false if it is idle and does not expect to work on more for a longer time
* @throws Exception when an unexpected error occurred
*/
public abstract boolean jobImpl() throws Exception;
@Override
public void freemem() {
try {
freememImpl();
} catch (final OutOfMemoryError e) {
ConcurrentLog.severe("BUSYTHREAD", "OutOfMemory Error in InstantBusyThread.freemem, thread '" + getName() + "': " + e.getMessage());
ConcurrentLog.logException(e);
}
}
@Override
public int getJobCount() {
return Integer.MAX_VALUE;
}
/**
* Called when an outOfMemoryCycle is performed.
*/
public void freememImpl() {
// Do nothing in this implementation, please override
}
@Override
public void open() {
// Not implemented in this thread
}
@Override
public synchronized void close() {
// Not implemented in this thread
}
/**
* Construct an InstantBusyThread instance from a runnable task.
*
* @param task
* the task to run as a job
* @param idleSleep
* defines min idle sleep time that can be set via setIdleSleep()
* @param busySleep
* defines min busy sleep time that can be set via setBusySleep()
* @return a InstantBusyThread instance
* @throws IllegalArgumentException
* when the task is null
*/
public static InstantBusyThread createFromRunnable(final Runnable task, final long idleSleep,
final long busySleep) {
if (task == null) {
throw new IllegalArgumentException("Runnable task must not be null");
}
InstantBusyThread busyThread = new InstantBusyThread(task.getClass().getName() + ".run", idleSleep, busySleep) {
@Override
public boolean jobImpl() throws Exception {
task.run();
return true;
}
};
return busyThread;
}
}
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