mirror of
https://github.com/yacy/yacy_search_server.git
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daf0f74361
search profiling showed, that a major amount of time is wasted by computing url hashes. The computation does an intranet-check, which needs a DNS lookup. This caused that each urlhash computation needed 100-200 milliseconds, which caused remote searches to delay at least 1 second more that necessary. The solution to this problem is to attach a URL hash to the URL data structure, because that means that the url hash value can be filled after retrieval of the URL from the database. The redesign of the url/urlhash management caused a major redesign of many parts of the software. Since some parts had been decided to be given up they had been removed during this change to avoid unnecessary maintenance of unused code. git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@4074 6c8d7289-2bf4-0310-a012-ef5d649a1542
323 lines
12 KiB
Java
323 lines
12 KiB
Java
// 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.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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import de.anomic.yacy.yacyURL;
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public final class plasmaCrawlLoader extends Thread {
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public static plasmaSwitchboard switchboard;
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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(serverLog theLog) {
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this.setName("plasmaCrawlLoader");
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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.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, boolean useThreadPool) 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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// get a new worker thread
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plasmaCrawlWorker theWorker = null;
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if (useThreadPool) {
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// getting a new crawler from the crawler pool
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theWorker = (plasmaCrawlWorker) this.crawlwerPool.borrowObject(protocol);
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} else {
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// create a new one
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theWorker = (plasmaCrawlWorker) this.crawlwerPool.getFactory().makeObject(protocol,false);
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}
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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, true);
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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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yacyURL 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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boolean keepInMemory
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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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keepInMemory
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);
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try {
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// start new crawl job
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this.execute(theMsg, false);
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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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yacyURL 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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boolean keepInMemory
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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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timeout, // -1 = use default crawler timeout
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keepInMemory // kept in memory ?
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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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