/*
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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
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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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
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying 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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* Portions Copyright 2006-2007 Sun Microsystems, Inc.
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*/
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package org.opends.server.loggers;
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import java.io.File;
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import java.lang.reflect.Method;
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import java.util.Arrays;
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import static org.opends.server.loggers.debug.DebugLogger.debugCought;
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import static org.opends.server.loggers.debug.DebugLogger.debugEnabled;
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import org.opends.server.types.DebugLogLevel;
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/**
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* This class implements a retention policy based on the free disk
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* space available expressed as a percentage. This policy is only
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* available on Java 6.
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*/
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public class FreeDiskSpaceRetentionPolicy implements RetentionPolicy
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{
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private long freeDiskSpace = 0;
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private File directory = null;
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private String prefix = null;
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/**
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* Create the retention policy based on the free disk space available.
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*
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* @param dir The directory in which the log files reside.
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* @param prefix The prefix for the log file names.
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* @param freeDiskSpace The free disk space needed.
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*/
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public FreeDiskSpaceRetentionPolicy(String dir, String prefix,
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long freeDiskSpace)
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{
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this.directory = new File(dir);
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this.freeDiskSpace = freeDiskSpace;
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this.prefix = prefix;
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}
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/**
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* This method deletes files based on the policy.
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*
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* @return number of files deleted.
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*/
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public int deleteFiles()
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{
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int count = 0;
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long freeSpace = 0;
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try
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{
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// Use reflection to see use the getFreeSpace method if available.
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// this method is only available on Java 6.
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Method meth = File.class.getMethod("getFreeSpace", new Class[0]);
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Object value = meth.invoke(this.directory);
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freeSpace = ((Long) value).longValue();
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}
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catch (Exception e)
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{
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if (debugEnabled())
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{
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debugCought(DebugLogLevel.ERROR, e);
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}
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return 0;
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}
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if (freeSpace > freeDiskSpace)
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{
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// No cleaning needed.
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return 0;
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}
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long freeSpaceNeeded = freeDiskSpace - freeSpace;
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File[] selectedFiles = directory.listFiles(new LogFileFilter(prefix));
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// Sort files based on last modified time.
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Arrays.sort(selectedFiles, new FileComparator());
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long freedSpace = 0;
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for (int j = selectedFiles.length - 1; j < 1; j--)
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{
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freedSpace += selectedFiles[j].length();
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// System.out.println("Deleting log file:" + selectedFiles[j]);
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selectedFiles[j].delete();
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if (freedSpace >= freeSpaceNeeded)
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{
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break;
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}
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count++;
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}
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return count;
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}
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}
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