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127 lines
4.9 KiB
127 lines
4.9 KiB
// plasmaCrawlerMsgQueue.java
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// -------------------------------------
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// part of YACY
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2006
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//
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// This file ist contributed by Martin Thelian
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//
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// $LastChangedDate: 2006-02-20 23:57:42 +0100 (Mo, 20 Feb 2006) $
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// $LastChangedRevision: 1715 $
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// $LastChangedBy: theli $
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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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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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package de.anomic.plasma.crawler;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Comparator;
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import de.anomic.plasma.plasmaCrawlLoaderMessage;
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import de.anomic.server.serverSemaphore;
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public class plasmaCrawlerMsgQueue {
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private final serverSemaphore readSync;
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private final serverSemaphore writeSync;
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private final ArrayList messageList;
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public plasmaCrawlerMsgQueue() {
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this.readSync = new serverSemaphore (0);
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this.writeSync = new serverSemaphore (1);
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this.messageList = new ArrayList(10);
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}
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/**
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*
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* @param newMessage
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* @throws MessageQueueLockedException
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* @throws InterruptedException
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*/
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public void addMessage(plasmaCrawlLoaderMessage newMessage)
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throws InterruptedException, NullPointerException
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{
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if (newMessage == null) throw new NullPointerException();
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this.writeSync.P();
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boolean insertionDoneSuccessfully = false;
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synchronized(this.messageList) {
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insertionDoneSuccessfully = this.messageList.add(newMessage);
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}
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if (insertionDoneSuccessfully) {
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this.sortMessages();
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this.readSync.V();
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}
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this.writeSync.V();
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}
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public plasmaCrawlLoaderMessage waitForMessage() throws InterruptedException {
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this.readSync.P();
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this.writeSync.P();
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plasmaCrawlLoaderMessage newMessage = null;
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synchronized(this.messageList) {
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newMessage = (plasmaCrawlLoaderMessage) this.messageList.remove(0);
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}
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this.writeSync.V();
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return newMessage;
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}
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protected void sortMessages() {
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Collections.sort(this.messageList, new Comparator() {
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public int compare(Object o1, Object o2)
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{
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plasmaCrawlLoaderMessage message1 = (plasmaCrawlLoaderMessage) o1;
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plasmaCrawlLoaderMessage message2 = (plasmaCrawlLoaderMessage) o2;
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int message1Priority = message1.crawlingPriority;
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int message2Priority = message2.crawlingPriority;
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if (message1Priority > message2Priority){
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return -1;
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} else if (message1Priority < message2Priority) {
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return 1;
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} else {
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return 0;
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}
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}
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});
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}
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} |