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100 lines
3.7 KiB
100 lines
3.7 KiB
// serverAbstractBlockingThread.java
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// (C) 2008 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 27.03.2008 on http://yacy.net
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//
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// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
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// $LastChangedRevision: 1986 $
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// $LastChangedBy: orbiter $
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//
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// LICENSE
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.server;
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import java.util.concurrent.BlockingQueue;
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import de.anomic.server.logging.serverLog;
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public abstract class serverAbstractBlockingThread<I extends serverProcessorJob, O extends serverProcessorJob> extends serverAbstractThread implements serverBlockingThread<I, O> {
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private BlockingQueue<I> input = null;
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private BlockingQueue<O> output = null;
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public void setInputQueue(BlockingQueue<I> queue) {
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this.input = queue;
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}
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public void setOutputQueue(BlockingQueue<O> queue) {
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this.output = queue;
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}
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public BlockingQueue<I> getInputQueue() {
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return this.input;
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}
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public BlockingQueue<O> getOutputQueue() {
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return this.output;
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}
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public void run() {
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this.open();
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if (log != null) {
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logSystem("thread '" + this.getName() + "' deployed, starting loop.");
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}
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long timestamp;
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long memstamp0, memstamp1;
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long busyCycles = 0;
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while (running) {
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try {
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// do job
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timestamp = System.currentTimeMillis();
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memstamp0 = serverMemory.used();
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I in = this.input.take();
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if ((in == null) || (in == serverProcessor.shutdownJob)) {
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// the poison pill: shutdown
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// a null element is pushed to the queue on purpose to signal
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// that a termination should be made
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this.running = false;
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break;
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}
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O out = this.job(in);
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if ((out != null) && (this.output != null)) this.output.put(out);
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// do memory and busy/idle-count/time monitoring
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memstamp1 = serverMemory.used();
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if (memstamp1 >= memstamp0) {
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// no GC in between. this is not shure but most probable
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memuse += memstamp1 - memstamp0;
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} else {
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// GC was obviously in between. Add an average as simple heuristic
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if (busyCycles > 0) memuse += memuse / busyCycles;
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}
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busytime += System.currentTimeMillis() - timestamp;
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} catch (Exception e) {
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// handle exceptions: thread must not die on any unexpected exceptions
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// if the exception is too bad it should call terminate()
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this.jobExceptionHandler(e);
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} finally {
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busyCycles++;
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}
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}
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this.close();
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logSystem("thread '" + this.getName() + "' terminated.");
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}
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private void logSystem(String text) {
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if (log == null) serverLog.logConfig("THREAD-CONTROL", text);
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else log.logConfig(text);
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}
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}
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