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// InstantBlockingThread.java
// (C) 2008 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
// first published 27.03.2008 on http://yacy.net
//
// $LastChangedDate$
// $LastChangedRevision$
// $LastChangedBy$
//
// LICENSE
//
// 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.concurrent.atomic.AtomicInteger;
import net.yacy.cora.util.ConcurrentLog;
public class InstantBlockingThread<J extends WorkflowJob> extends AbstractBlockingThread<J> implements BlockingThread<J> {
private static final String BLOCKINGTHREAD = "BLOCKINGTHREAD";
private final WorkflowTask<J> task;
private static AtomicInteger handleCounter = new AtomicInteger(0);
private static AtomicInteger instantThreadCounter = new AtomicInteger(0);
public InstantBlockingThread(final WorkflowProcessor<J> manager) {
super();
// set the manager of blocking queues for input and output
setManager(manager);
// define task to be executed
this.task = manager.getTask();
setName(manager.getName() + "." + handleCounter.getAndIncrement());
}
@Override
public int getJobCount() {
return getManager().getQueueSize();
}
@Override
@SuppressWarnings("unchecked")
public J job(final J next) throws Exception {
J out = null;
// see if we got a poison pill to tell us to shut down
if (next == null) {
out = (J) WorkflowJob.poisonPill;
} else if (next == WorkflowJob.poisonPill || next.status == WorkflowJob.STATUS_POISON) {
out = next;
} else {
final long t = System.currentTimeMillis();
instantThreadCounter.incrementAndGet();
//System.out.println("started job " + this.handle + ": " + this.getName());
try {
out = this.task.process(next);
} catch (final Throwable e) {
ConcurrentLog.severe(BLOCKINGTHREAD, "Internal Error in serverInstantThread.job: " + e.getMessage());
ConcurrentLog.severe(BLOCKINGTHREAD, "shutting down thread '" + getName() + "'");
ConcurrentLog.logException(e);
ConcurrentLog.logException(e.getCause());
ConcurrentLog.severe(BLOCKINGTHREAD, "Runtime Error in serverInstantThread.job, thread '" + getName() + "': " + e.getMessage());
}
instantThreadCounter.decrementAndGet();
getManager().increaseJobTime(System.currentTimeMillis() - t);
}
return out;
}
}
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