/*
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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 java.util.ArrayList;
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import java.util.List;
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import static org.opends.server.loggers.debug.DebugLogger.*;
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import org.opends.server.loggers.debug.DebugTracer;
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import org.opends.server.types.DebugLogLevel;
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import org.opends.server.types.ResultCode;
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import org.opends.server.types.ConfigChangeResult;
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import org.opends.server.admin.std.server.FreeDiskSpaceLogRetentionPolicyCfg;
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import org.opends.server.admin.server.ConfigurationChangeListener;
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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
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RetentionPolicy<FreeDiskSpaceLogRetentionPolicyCfg>,
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ConfigurationChangeListener<FreeDiskSpaceLogRetentionPolicyCfg>
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{
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/**
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* The tracer object for the debug logger.
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*/
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private static final DebugTracer TRACER = getTracer();
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private long freeDiskSpace = 0;
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/**
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* {@inheritDoc}
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*/
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public void initializeLogRetentionPolicy(
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FreeDiskSpaceLogRetentionPolicyCfg config)
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{
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freeDiskSpace = config.getFreeDiskSpace();
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config.addFreeDiskSpaceChangeListener(this);
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}
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/**
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* {@inheritDoc}
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*/
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public boolean isConfigurationChangeAcceptable(
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FreeDiskSpaceLogRetentionPolicyCfg config,
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List<String> unacceptableReasons)
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{
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// Changes should always be OK
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return true;
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}
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/**
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* {@inheritDoc}
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*/
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public ConfigChangeResult applyConfigurationChange(
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FreeDiskSpaceLogRetentionPolicyCfg config)
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{
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// Default result code.
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ResultCode resultCode = ResultCode.SUCCESS;
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boolean adminActionRequired = false;
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ArrayList<String> messages = new ArrayList<String>();
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freeDiskSpace = config.getFreeDiskSpace();
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return new ConfigChangeResult(resultCode, adminActionRequired, messages);
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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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* @param writer the multi file text writer writing the log files.
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* @return number of files deleted.
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*/
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public int deleteFiles(MultifileTextWriter writer)
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{
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File[] files = writer.getNamingPolicy().listFiles();
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if(files.length <= 0)
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{
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return 0;
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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(files[0]);
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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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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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return 0;
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}
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if(debugEnabled())
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{
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TRACER.debugInfo("Current free disk space: %d, Required: %d", freeSpace,
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freeDiskSpace);
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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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// Sort files based on last modified time.
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Arrays.sort(files, new FileComparator());
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long freedSpace = 0;
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for (int j = files.length - 1; j < 1; j--)
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{
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freedSpace += files[j].length();
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if(debugEnabled())
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{
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TRACER.debugInfo("Deleting log file:", files[j]);
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}
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files[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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