/*
* Copyright 2014 Cisco Systems, Inc.
*
* Licensed 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 com.cisco.oss.foundation.logging.appender;
import org.apache.log4j.helpers.FileHelper;
import org.apache.log4j.helpers.LogLog;
import java.io.File;
import java.util.Iterator;
import java.util.List;
/**
* Responsible for periodically sampling the number of log files with a given
* base filename and time-based extension, and for deleting the older files if
* the file count limit is exceeded.
*
* @author <a href="mailto:simon_park_mail AT yahoo DOT co DOT uk">Simon
* Park</a>
* @version 1.3
*/
public final class DefaultLogFileScavenger extends AbstractLogFileScavenger {
DefaultLogFileScavenger() {
super();
}
public void scavenge() {
final LogFileList logFileList = this.logFileList();
final int fileListSize = logFileList.size();
// count number of excess files
final int maxRollFileCount = this.getProperties().getMaxRollFileCount();
if (fileListSize >= maxRollFileCount) {
// oldest ones at start of list won't be being written to, so delete
// them
final int toIndex = fileListSize - maxRollFileCount;
final List subList = logFileList.subList(0, toIndex);
final FileHelper fileHelper = FileHelper.getInstance();
for (final Iterator iter = subList.iterator(); iter.hasNext();) {
final File logFile = (File) iter.next();
if (fileHelper.deleteExisting(logFile)) {
LogLog.debug("Scavenged log file '" + logFile.getName() + '\'');
}
}
}
}
}