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// plasmaCrawlerLoader.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, 2004
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// last major change: 25.02.2004
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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;
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import java.net.URL;
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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.server.serverSemaphore;
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import de.anomic.server.logging.serverLog;
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import org.apache.commons.pool.impl.GenericObjectPool;
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public final class plasmaCrawlLoader extends Thread {
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private final plasmaHTCache cacheManager;
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private final int socketTimeout;
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private final int loadTimeout;
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private final int maxSlots;
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private final serverLog log;
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private final CrawlerMessageQueue theQueue;
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private final CrawlerPool crawlwerPool;
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private GenericObjectPool.Config cralwerPoolConfig = null;
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private final ThreadGroup theThreadGroup = new ThreadGroup("CrawlerThreads");
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private boolean stopped = false;
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public plasmaCrawlLoader(
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plasmaHTCache cacheManager,
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serverLog log,
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int socketTimeout,
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int loadTimeout,
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int mslots,
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boolean proxyUse,
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String proxyHost,
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int proxyPort) {
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this.setName("plasmaCrawlLoader");
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this.cacheManager = cacheManager;
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this.log = log;
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this.socketTimeout = socketTimeout;
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this.loadTimeout = loadTimeout;
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this.maxSlots = mslots;
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// configuring the crawler messagequeue
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this.theQueue = new CrawlerMessageQueue();
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// configuring the crawler thread pool
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// implementation of session thread pool
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this.cralwerPoolConfig = new GenericObjectPool.Config();
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// The maximum number of active connections that can be allocated from pool at the same time,
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// 0 for no limit
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this.cralwerPoolConfig.maxActive = this.maxSlots;
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// The maximum number of idle connections connections in the pool
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// 0 = no limit.
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this.cralwerPoolConfig.maxIdle = this.maxSlots / 2;
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this.cralwerPoolConfig.minIdle = this.maxSlots / 4;
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// block undefinitely
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this.cralwerPoolConfig.maxWait = -1;
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// Action to take in case of an exhausted DBCP statement pool
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// 0 = fail, 1 = block, 2= grow
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this.cralwerPoolConfig.whenExhaustedAction = GenericObjectPool.WHEN_EXHAUSTED_BLOCK;
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this.cralwerPoolConfig.minEvictableIdleTimeMillis = 30000;
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// config.testOnReturn = true;
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CrawlerFactory theFactory = new CrawlerFactory(
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this.theThreadGroup,
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cacheManager,
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socketTimeout,
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proxyUse,
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proxyHost,
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proxyPort,
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log);
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this.crawlwerPool = new CrawlerPool(theFactory,this.cralwerPoolConfig,this.theThreadGroup);
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// start the crawl loader
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this.start();
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}
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public GenericObjectPool.Config getPoolConfig() {
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return this.cralwerPoolConfig;
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}
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public void setPoolConfig(GenericObjectPool.Config newConfig) {
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this.crawlwerPool.setConfig(newConfig);
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}
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public void close() {
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try {
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// setting the stop flag to true
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this.stopped = true;
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// interrupting the plasmaCrawlLoader
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this.interrupt();
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// waiting for the thread to finish ...
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this.log.logInfo("Waiting for plasmaCrawlLoader shutdown ...");
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this.join(5000);
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} catch (Exception e) {
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// we where interrupted while waiting for the crawlLoader Thread to finish
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}
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}
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public ThreadGroup threadStatus() {
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return this.theThreadGroup;
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}
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public void run() {
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while (!this.stopped && !Thread.interrupted()) {
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try {
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// getting a new message from the crawler queue
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plasmaCrawlLoaderMessage theMsg = this.theQueue.waitForMessage();
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// getting a new crawler from the crawler pool
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plasmaCrawlWorker theWorker = (plasmaCrawlWorker) this.crawlwerPool.borrowObject();
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theWorker.execute(theMsg);
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} catch (InterruptedException e) {
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Thread.interrupted();
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this.stopped = true;
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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}
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// consuming the is interrupted flag
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this.isInterrupted();
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// closing the pool
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try {
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this.crawlwerPool.close();
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}
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catch (Exception e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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}
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public void loadParallel(
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URL url,
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String name,
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String referer,
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String initiator,
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int depth,
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plasmaCrawlProfile.entry profile) {
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if (!this.crawlwerPool.isClosed) {
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int crawlingPriority = 5;
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// creating a new crawler queue object
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plasmaCrawlLoaderMessage theMsg = new plasmaCrawlLoaderMessage(url, name, referer, initiator, depth, profile, crawlingPriority);
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// adding the message to the queue
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try {
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this.theQueue.addMessage(theMsg);
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} catch (InterruptedException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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}
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}
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public int size() {
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return crawlwerPool.getNumActive();
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}
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}
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class CrawlerMessageQueue {
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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 CrawlerMessageQueue() {
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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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}
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final class CrawlerPool extends GenericObjectPool {
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private final ThreadGroup theThreadGroup;
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public boolean isClosed = false;
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public CrawlerPool(CrawlerFactory objFactory,
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GenericObjectPool.Config config,
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ThreadGroup threadGroup) {
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super(objFactory, config);
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this.theThreadGroup = threadGroup;
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objFactory.setPool(this);
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}
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public Object borrowObject() throws Exception {
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return super.borrowObject();
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}
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public void returnObject(Object obj) throws Exception {
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super.returnObject(obj);
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}
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public synchronized void close() throws Exception {
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/*
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* shutdown all still running session threads ...
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*/
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// interrupting all still running or pooled threads ...
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this.theThreadGroup.interrupt();
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/* waiting for all threads to finish */
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int threadCount = this.theThreadGroup.activeCount();
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Thread[] threadList = new Thread[threadCount];
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threadCount = this.theThreadGroup.enumerate(threadList);
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try {
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for ( int currentThreadIdx = 0; currentThreadIdx < threadCount; currentThreadIdx++ ) {
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((plasmaCrawlWorker)threadList[currentThreadIdx]).setStopped(true);
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}
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for ( int currentThreadIdx = 0; currentThreadIdx < threadCount; currentThreadIdx++ ) {
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// we need to use a timeout here because of missing interruptable session threads ...
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if (threadList[currentThreadIdx].isAlive()) threadList[currentThreadIdx].join(500);
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}
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}
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catch (InterruptedException e) {
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System.err.println("Interruption while trying to shutdown all crawler threads.");
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}
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this.isClosed = true;
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super.close();
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}
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}
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final class CrawlerFactory implements org.apache.commons.pool.PoolableObjectFactory {
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private CrawlerPool thePool;
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private final ThreadGroup theThreadGroup;
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private final plasmaHTCache cacheManager;
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private final int socketTimeout;
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private final boolean remoteProxyUse;
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private final String remoteProxyHost;
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private final int remoteProxyPort;
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private final serverLog theLog;
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public CrawlerFactory(
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ThreadGroup theThreadGroup,
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plasmaHTCache cacheManager,
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int socketTimeout,
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boolean remoteProxyUse,
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String remoteProxyHost,
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int remoteProxyPort,
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serverLog theLog) {
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super();
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if (theThreadGroup == null)
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throw new IllegalArgumentException("The threadgroup object must not be null.");
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this.theThreadGroup = theThreadGroup;
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this.cacheManager = cacheManager;
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this.socketTimeout = socketTimeout;
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this.remoteProxyUse = remoteProxyUse;
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this.remoteProxyHost = remoteProxyHost;
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this.remoteProxyPort = remoteProxyPort;
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this.theLog = theLog;
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}
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public void setPool(CrawlerPool thePool) {
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this.thePool = thePool;
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}
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/**
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* @see org.apache.commons.pool.PoolableObjectFactory#makeObject()
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*/
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public Object makeObject() {
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return new plasmaCrawlWorker(
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this.theThreadGroup,
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this.thePool,
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this.cacheManager,
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this.socketTimeout,
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this.remoteProxyUse,
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this.remoteProxyHost,
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this.remoteProxyPort,
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this.theLog);
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}
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/**
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* @see org.apache.commons.pool.PoolableObjectFactory#destroyObject(java.lang.Object)
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*/
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public void destroyObject(Object obj) {
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if (obj instanceof plasmaCrawlWorker) {
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plasmaCrawlWorker theWorker = (plasmaCrawlWorker) obj;
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theWorker.setStopped(true);
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|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @see org.apache.commons.pool.PoolableObjectFactory#validateObject(java.lang.Object)
|
|
|
|
*/
|
|
|
|
public boolean validateObject(Object obj) {
|
|
|
|
if (obj instanceof plasmaCrawlWorker)
|
|
|
|
{
|
|
|
|
plasmaCrawlWorker theWorker = (plasmaCrawlWorker) obj;
|
|
|
|
if (!theWorker.isAlive() || theWorker.isInterrupted()) return false;
|
|
|
|
if (theWorker.isRunning()) return true;
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @param obj
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
public void activateObject(Object obj) {
|
|
|
|
//log.debug(" activateObject...");
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @param obj
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
public void passivateObject(Object obj) {
|
|
|
|
//log.debug(" passivateObject..." + obj);
|
|
|
|
if (obj instanceof plasmaCrawlWorker) {
|
|
|
|
plasmaCrawlWorker theWorker = (plasmaCrawlWorker) obj;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|