org.apache.nutch.admin.management.LinkdbThread.java Source code

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Here is the source code for org.apache.nutch.admin.management.LinkdbThread.java

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/**
 * Copyright 2005 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.nutch.admin.management;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.Path;
import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.nutch.admin.TaskThread;
import org.apache.nutch.crawl.LinkDb;

public class LinkdbThread extends TaskThread {

    private static final Log LOG = LogFactory.getLog(LinkdbThread.class.getName());

    private LinkDb fLinkdb;

    private Path[] fSegments;

    private Path fLinkdbFile;

    public LinkdbThread(Configuration configuration, Path linkdb, Path[] segments) {
        super(configuration);
        this.fLinkdb = new LinkDb(configuration);
        this.fLinkdbFile = linkdb;
        this.fSegments = segments;
    }

    public void run() {
        FileSystem fileSystem = null;
        try {
            this.fMessage = "linkdb.running";
            fileSystem = FileSystem.get(this.fConfiguration);
            Path running = new Path(this.fLinkdbFile, "linkdb.running");
            // create lock files in segments
            for (int i = 0; i < this.fSegments.length; i++) {
                Path file = this.fSegments[i];
                fileSystem.createNewFile(new Path(file, "linkdb.running"));
            }
            // create lockfile in linkdb
            fileSystem.createNewFile(running);

            // this.fLinkdb.invert(this.fLinkdbFile, this.fSegments, true, true);
            this.fLinkdb.invert(this.fLinkdbFile, this.fSegments, true, true, false);

            for (int i = 0; i < this.fSegments.length; i++) {
                Path file = this.fSegments[i];
                fileSystem.createNewFile(new Path(file, "invert.done"));
            }
        } catch (IOException e) {
            LOG.warn(e.toString());
            this.fMessage = e.toString();
        } finally {
            try {
                if (fileSystem != null) {
                    // delete lock files and create done files
                    for (int i = 0; i < this.fSegments.length; i++) {
                        Path file = this.fSegments[i];
                        fileSystem.delete(new Path(file, "linkdb.running"));
                    }
                    // delete lock file from linkdb
                    fileSystem.delete(new Path(this.fLinkdbFile, "linkdb.running"));
                }
            } catch (IOException e) {
                LOG.warn(e.toString());
            }
        }
    }
}