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315 lines
11 KiB
315 lines
11 KiB
// 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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//
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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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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.util.Arrays;
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import java.util.HashSet;
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import org.apache.commons.pool.impl.GenericKeyedObjectPool;
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import org.apache.commons.pool.impl.GenericObjectPool;
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import de.anomic.net.URL;
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import de.anomic.plasma.crawler.plasmaCrawlWorker;
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import de.anomic.plasma.crawler.plasmaCrawlerException;
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import de.anomic.plasma.crawler.plasmaCrawlerFactory;
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import de.anomic.plasma.crawler.plasmaCrawlerMsgQueue;
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import de.anomic.plasma.crawler.plasmaCrawlerPool;
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import de.anomic.server.logging.serverLog;
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public final class plasmaCrawlLoader extends Thread {
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public static plasmaSwitchboard switchboard;
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private final plasmaHTCache cacheManager;
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private final serverLog log;
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private HashSet supportedProtocols;
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private final plasmaCrawlerMsgQueue theQueue;
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private final plasmaCrawlerPool crawlwerPool;
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private GenericKeyedObjectPool.Config crawlerPoolConfig = 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 theCacheManager,
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serverLog theLog) {
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this.setName("plasmaCrawlLoader");
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this.cacheManager = theCacheManager;
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this.log = theLog;
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// supported protocols
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// TODO: change this, e.g. by loading settings from file
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this.supportedProtocols = new HashSet(Arrays.asList(new String[]{"http","https"/* ,"ftp" */}));
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// configuring the crawler messagequeue
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this.theQueue = new plasmaCrawlerMsgQueue();
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// configuring the crawler thread pool
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// implementation of session thread pool
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this.crawlerPoolConfig = new GenericKeyedObjectPool.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.crawlerPoolConfig.maxActive = Integer.parseInt(switchboard.getConfig("crawler.MaxActiveThreads","10"));
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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.crawlerPoolConfig.maxIdle = Integer.parseInt(switchboard.getConfig("crawler.MaxIdleThreads","7"));
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// minIdle configuration not possible for keyedObjectPools
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//this.crawlerPoolConfig.minIdle = Integer.parseInt(switchboard.getConfig("crawler.MinIdleThreads","5"));
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// block undefinitely
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this.crawlerPoolConfig.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.crawlerPoolConfig.whenExhaustedAction = GenericObjectPool.WHEN_EXHAUSTED_BLOCK;
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this.crawlerPoolConfig.minEvictableIdleTimeMillis = 30000;
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//this.crawlerPoolConfig.timeBetweenEvictionRunsMillis = 30000;
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// config.testOnReturn = true;
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plasmaCrawlerFactory theFactory = new plasmaCrawlerFactory(
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this.theThreadGroup,
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switchboard,
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this.cacheManager,
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this.log);
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this.crawlwerPool = new plasmaCrawlerPool(theFactory,this.crawlerPoolConfig,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 GenericKeyedObjectPool.Config getPoolConfig() {
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return this.crawlerPoolConfig;
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}
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public void setPoolConfig(GenericKeyedObjectPool.Config newConfig) {
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this.crawlwerPool.setConfig(newConfig);
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}
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public boolean isSupportedProtocol(String protocol) {
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if ((protocol == null) || (protocol.length() == 0)) return false;
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return this.supportedProtocols.contains(protocol.trim().toLowerCase());
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}
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public HashSet getSupportedProtocols() {
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return (HashSet) this.supportedProtocols.clone();
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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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private void execute(plasmaCrawlLoaderMessage theMsg) throws Exception {
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// getting the protocol of the next URL
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String protocol = theMsg.url.getProtocol();
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// TODO: remove this
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if (protocol.equals("https")) protocol = "http";
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// getting a new crawler from the crawler pool
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plasmaCrawlWorker theWorker = (plasmaCrawlWorker) this.crawlwerPool.borrowObject(protocol);
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if (theWorker == null) {
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this.log.logWarning("Unsupported protocol '" + protocol + "' in url " + theMsg.url);
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} else {
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theWorker.execute(theMsg);
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}
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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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// start new crawl job
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this.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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this.log.logSevere("plasmaCrawlLoader.run/loop", e);
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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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this.log.logSevere("plasmaCrawlLoader.run/close", e);
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}
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}
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public plasmaHTCache.Entry loadSync(
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URL url,
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String urlName,
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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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int timeout
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) throws plasmaCrawlerException {
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plasmaHTCache.Entry result = null;
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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(
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url,
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urlName,
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referer,
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initiator,
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depth,
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profile,
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crawlingPriority,
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true,
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timeout
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);
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try {
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// start new crawl job
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this.execute(theMsg);
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// wait for the crawl job result
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result = theMsg.waitForResult();
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} catch (Exception e) {
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this.log.logSevere("plasmaCrawlLoader.loadSync: Unexpected error", e);
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throw new plasmaCrawlerException("Unexpected error: " + e.getMessage());
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}
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// check if an error has occured
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if (result == null) {
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String errorMsg = theMsg.getError();
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throw new plasmaCrawlerException(errorMsg);
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}
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}
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// return the result
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return result;
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}
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public void loadAsync(
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URL url,
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String urlName,
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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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) {
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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(
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url, // url
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urlName, // url name
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referer, // referer URL
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initiator, // crawling initiator peer
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depth, // crawling depth
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profile, // crawling profile
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crawlingPriority, // crawling priority
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false, // only download documents whose mimetypes are enabled for the crawler
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-1 // use default crawler timeout
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);
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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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this.log.logSevere("plasmaCrawlLoader.loadAsync", e);
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}
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}
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}
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public int getNumIdleWorker() {
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return this.crawlwerPool.getNumIdle();
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}
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public int getNumActiveWorker() {
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return size();
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}
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public int size() {
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return this.crawlwerPool.getNumActive();
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}
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}
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