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ActiveMQ example source code file (DataFile.java)
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.activemq.kaha.impl.data; import java.io.File; import java.io.FileNotFoundException; import java.io.IOException; import java.io.RandomAccessFile; /** * DataFile * * */ class DataFile { private final File file; private final Integer number; private int referenceCount; private RandomAccessFile randomAcessFile; private Object writerData; private long length; private boolean dirty; DataFile(File file, int number) { this.file = file; this.number = Integer.valueOf(number); length = file.exists() ? file.length() : 0; } Integer getNumber() { return number; } synchronized RandomAccessFile getRandomAccessFile() throws FileNotFoundException { if (randomAcessFile == null) { randomAcessFile = new RandomAccessFile(file, "rw"); } return randomAcessFile; } synchronized long getLength() { return length; } synchronized void incrementLength(int size) { length += size; } synchronized void purge() throws IOException { if (randomAcessFile != null) { randomAcessFile.close(); randomAcessFile = null; } } synchronized boolean delete() throws IOException { purge(); return file.delete(); } synchronized void close() throws IOException { if (randomAcessFile != null) { randomAcessFile.close(); } } synchronized int increment() { return ++referenceCount; } synchronized int decrement() { return --referenceCount; } synchronized boolean isUnused() { return referenceCount <= 0; } public String toString() { String result = file.getName() + " number = " + number + " , length = " + length + " refCount = " + referenceCount; return result; } /** * @return Opaque data that a DataFileWriter may want to associate with the * DataFile. */ public synchronized Object getWriterData() { return writerData; } /** * @param writerData - Opaque data that a DataFileWriter may want to * associate with the DataFile. */ public synchronized void setWriterData(Object writerData) { this.writerData = writerData; dirty = true; } public synchronized boolean isDirty() { return dirty; } public synchronized void setDirty(boolean value) { this.dirty = value; } } Other ActiveMQ examples (source code examples)Here is a short list of links related to this ActiveMQ DataFile.java source code file: |
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