ActiveMQ example source code file (DataFile.java)

This example ActiveMQ source code file (DataFile.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - ActiveMQ tags/keywords

comparable, datafile, datafile, file, integer, io, ioexception, ioexception, linkednode, override, randomaccessfile, randomaccessfile, sequenceset, sequenceset, string

The ActiveMQ DataFile.java source code

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.kahadb.journal;

import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;

import org.apache.kahadb.util.IOHelper;
import org.apache.kahadb.util.LinkedNode;
import org.apache.kahadb.util.SequenceSet;

/**
 * DataFile
 * 
 * 
 */
public class DataFile extends LinkedNode<DataFile> implements Comparable {

    protected final File file;
    protected final Integer dataFileId;
    protected int length;
    protected final SequenceSet corruptedBlocks = new SequenceSet();

    DataFile(File file, int number, int preferedSize) {
        this.file = file;
        this.dataFileId = Integer.valueOf(number);
        length = (int)(file.exists() ? file.length() : 0);
    }
    
    public File getFile() {
        return file;
    }

    public Integer getDataFileId() {
        return dataFileId;
    }

    public synchronized int getLength() {
        return length;
    }

    public void setLength(int length) {
        this.length = length;
    }

    public synchronized void incrementLength(int size) {
        length += size;
    }

    public synchronized String toString() {
        return file.getName() + " number = " + dataFileId + " , length = " + length;
    }

    public synchronized RandomAccessFile openRandomAccessFile() throws IOException {
        return new RandomAccessFile(file, "rw");
    }

    public synchronized void closeRandomAccessFile(RandomAccessFile file) throws IOException {
        file.close();
    }

    public synchronized boolean delete() throws IOException {
        return file.delete();
    }
    
    public synchronized void move(File targetDirectory) throws IOException{
        IOHelper.moveFile(file,targetDirectory);
    }

    public SequenceSet getCorruptedBlocks() {
        return corruptedBlocks;
    }
    
    public int compareTo(DataFile df) {
        return dataFileId - df.dataFileId;
    }

    @Override
    public boolean equals(Object o) {
        boolean result = false;
        if (o instanceof DataFile) {
            result = compareTo((DataFile)o) == 0;
        }
        return result;
    }

    @Override
    public int hashCode() {
        return dataFileId;
    }
}