persiststoreprocessor.java

Heritrix是一个开源,可扩展的web爬虫项目。Heritrix设计成严格按照robots.txt文件的排除指示和META robots标签。

/* PersistStoreProcessor
 * 
 * Created on Feb 12, 2005
 *
 * Copyright (C) 2007 Internet Archive.
 * 
 * This file is part of the Heritrix web crawler (crawler.archive.org).
 * 
 * Heritrix is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * any later version.
 * 
 * Heritrix is distributed in the hope that it will be useful, 
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser Public License
 * along with Heritrix; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package org.archive.crawler.processor.recrawl;

import java.io.File;

import org.archive.crawler.datamodel.CrawlURI;
import org.archive.crawler.event.CrawlStatusListener;

import com.sleepycat.je.DatabaseException;

/**
 * Store CrawlURI attributes from latest fetch to persistent storage for
 * consultation by a later recrawl. 
 * 
 * @author gojomo
 * @version $Date: 2006-09-25 20:19:54 +0000 (Mon, 25 Sep 2006) $, $Revision: 4654 $
 */
public class PersistStoreProcessor extends PersistOnlineProcessor 
implements CrawlStatusListener {
    private static final long serialVersionUID = -8308356194337303758L;

    /**
     * Usual constructor
     * 
     * @param name
     */
    public PersistStoreProcessor(String name) {
        super(name, "PersistStoreProcessor. Stores CrawlURI attributes " +
                "from latest fetch for consultation by a later recrawl.");
    }

    protected void initialTasks() {
        super.initialTasks();
        // Add this class to crawl state listeners to note checkpoints
        getController().addCrawlStatusListener(this);
    }
    
    @Override
    protected void innerProcess(CrawlURI curi) throws InterruptedException {
        if(shouldStore(curi)) {
            store.put(persistKeyFor(curi),curi.getPersistentAList());
        }
    }
    
    public void crawlCheckpoint(File checkpointDir) throws Exception {
        // sync db
        try {
            historyDb.sync();
        } catch (DatabaseException e) {
            // TODO Auto-generated catch block
            throw new RuntimeException(e);
        }
    }

    public void crawlEnded(String sExitMessage) {
        // ignored
        
    }

    public void crawlEnding(String sExitMessage) {
        // ignored
        
    }

    public void crawlPaused(String statusMessage) {
        // ignored
        
    }

    public void crawlPausing(String statusMessage) {
        // ignored
        
    }

    public void crawlResuming(String statusMessage) {
        // ignored
        
    }

    public void crawlStarted(String message) {
        // ignored
    }
}