/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at legal-notices/CDDLv1_0.txt
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* or http://forgerock.org/license/CDDLv1.0.html.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at legal-notices/CDDLv1_0.txt.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2014 ForgeRock AS.
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*/
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package org.opends.server.replication.server.changelog.file;
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import java.io.File;
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import java.io.RandomAccessFile;
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import org.opends.server.replication.server.changelog.api.ChangelogException;
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import org.opends.server.util.StaticUtils;
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import static org.opends.messages.ReplicationMessages.*;
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/**
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* A Pool of readers to a log file.
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*/
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// TODO : implement a real pool - reusing readers instead of opening-closing them each time
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class LogReaderPool
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{
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/** The file to read. */
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private final File file;
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/**
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* Creates a pool of readers for provided file.
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*
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* @param file
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* The file to read.
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*/
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LogReaderPool(File file)
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{
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this.file = file;
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}
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/**
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* Returns a random access reader on the provided file.
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* <p>
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* The acquired reader must be released with the {@code release()}
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* method.
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*
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* @return a random access reader
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* @throws ChangelogException
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* If the file can't be found or read.
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*/
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RandomAccessFile get() throws ChangelogException
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{
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return getRandomAccess(file);
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}
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/**
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* Release the provided reader.
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* <p>
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* Once released, this reader must not be used any more.
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*
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* @param reader
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* The random access reader to a file previously acquired with this
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* pool.
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*/
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void release(RandomAccessFile reader)
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{
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StaticUtils.close(reader);
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}
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/** Returns a random access file to read this log. */
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private RandomAccessFile getRandomAccess(File file) throws ChangelogException
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{
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try
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{
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return new RandomAccessFile(file, "r");
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}
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catch (Exception e)
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{
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throw new ChangelogException(ERR_CHANGELOG_UNABLE_TO_OPEN_READER_ON_LOG_FILE.get(file.getPath()), e);
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}
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}
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/**
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* Shutdown this pool, releasing all files handles opened
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* on the file.
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*/
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void shutdown()
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{
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// Nothing to do yet as no file handle is kept opened.
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}
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}
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