001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.activemq.store.kahadb.disk.journal;
018
019import java.io.File;
020import java.io.IOException;
021import java.io.RandomAccessFile;
022import java.nio.ByteBuffer;
023import java.nio.channels.FileChannel;
024
025import org.apache.activemq.store.kahadb.disk.util.LinkedNode;
026import org.apache.activemq.store.kahadb.disk.util.SequenceSet;
027import org.apache.activemq.util.IOHelper;
028import org.apache.activemq.util.RecoverableRandomAccessFile;
029import org.slf4j.Logger;
030import org.slf4j.LoggerFactory;
031
032/**
033 * DataFile
034 *
035 *
036 */
037public class DataFile extends LinkedNode<DataFile> implements Comparable<DataFile> {
038
039    private static final Logger LOG = LoggerFactory.getLogger(DataFile.class);
040
041    protected final File file;
042    protected final Integer dataFileId;
043    protected volatile int length;
044    protected final SequenceSet corruptedBlocks = new SequenceSet();
045
046    DataFile(File file, int number) {
047        this.file = file;
048        this.dataFileId = Integer.valueOf(number);
049        length = (int)(file.exists() ? file.length() : 0);
050    }
051
052    public File getFile() {
053        return file;
054    }
055
056    public Integer getDataFileId() {
057        return dataFileId;
058    }
059
060    public synchronized int getLength() {
061        return length;
062    }
063
064    public void setLength(int length) {
065        this.length = length;
066    }
067
068    public synchronized void incrementLength(int size) {
069        length += size;
070    }
071
072    public synchronized void decrementLength(int size) {
073        length -= size;
074    }
075
076    @Override
077        public synchronized String toString() {
078        return file.getName() + " number = " + dataFileId + " , length = " + length;
079    }
080
081    public synchronized RecoverableRandomAccessFile openRandomAccessFile() throws IOException {
082        return new RecoverableRandomAccessFile(file.getCanonicalPath(), "rw");
083    }
084
085    public synchronized void closeRandomAccessFile(RecoverableRandomAccessFile file) throws IOException {
086        file.close();
087    }
088
089    public synchronized boolean delete() throws IOException {
090        return file.delete();
091    }
092
093    public synchronized void move(File targetDirectory) throws IOException{
094        IOHelper.moveFile(file, targetDirectory);
095    }
096
097    public SequenceSet getCorruptedBlocks() {
098        return corruptedBlocks;
099    }
100
101    @Override
102        public int compareTo(DataFile df) {
103        return dataFileId - df.dataFileId;
104    }
105
106    @Override
107    public boolean equals(Object o) {
108        boolean result = false;
109        if (o instanceof DataFile) {
110            result = compareTo((DataFile)o) == 0;
111        }
112        return result;
113    }
114
115    @Override
116    public int hashCode() {
117        return dataFileId;
118    }
119
120}