/**
* Logback: the reliable, generic, fast and flexible logging framework.
*
* Copyright (C) 1999-2006, QOS.ch
*
* This library is free software, you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation.
*/
package ch.qos.logback.core.rolling;
import java.io.File;
import java.util.Date;
import java.util.concurrent.Future;
import ch.qos.logback.core.rolling.helper.AsynchronousCompressor;
import ch.qos.logback.core.rolling.helper.Compressor;
import ch.qos.logback.core.rolling.helper.CompressionMode;
import ch.qos.logback.core.rolling.helper.DateTokenConverter;
import ch.qos.logback.core.rolling.helper.FileNamePattern;
import ch.qos.logback.core.rolling.helper.RenameUtil;
import ch.qos.logback.core.rolling.helper.RollingCalendar;
import ch.qos.logback.core.rolling.helper.TimeBasedCleaner;
/**
* <code>TimeBasedRollingPolicy</code> is both easy to configure and quite
* powerful. It allows the roll over to be made based on time. It is
* possible to specify that the roll over occur once per day, per week or
* per month.
*
* <p>For more information, please refer to the online manual at
* http://logback.qos.ch/manual/appenders.html#TimeBasedRollingPolicy
*
* @author Ceki Gülcü
*/
public class TimeBasedRollingPolicy<E> extends RollingPolicyBase implements
TriggeringPolicy<E> {
static final String FNP_NOT_SET = "The FileNamePattern option must be set before using TimeBasedRollingPolicy. ";
static final String SEE_FNP_NOT_SET = "See also http://logback.qos.ch/codes.html#tbr_fnp_not_set";
static final int DEFAULT_MAX_HISTORY = 0;
RollingCalendar rc;
long currentTime;
long nextCheck;
// indicate whether the time has been forced or not
boolean isTimeForced = false;
Date lastCheck = new Date();
String elapsedPeriodsFileName;
FileNamePattern activeFileNamePattern;
RenameUtil util = new RenameUtil();
String lastGeneratedFileName;
Future<?> future;
int maxHistory = DEFAULT_MAX_HISTORY;
TimeBasedCleaner tbCleaner;
public void setCurrentTime(long timeInMillis) {
currentTime = timeInMillis;
isTimeForced = true;
}
public long getCurrentTime() {
// if time is forced return the time set by user
if (isTimeForced) {
return currentTime;
} else {
return System.currentTimeMillis();
}
}
public void start() {
// set the LR for our utility object
util.setContext(this.context);
// find out period from the filename pattern
if (fileNamePatternStr != null) {
fileNamePattern = new FileNamePattern(fileNamePatternStr, this.context);
determineCompressionMode();
} else {
addWarn(FNP_NOT_SET);
addWarn(SEE_FNP_NOT_SET);
throw new IllegalStateException(FNP_NOT_SET + SEE_FNP_NOT_SET);
}
DateTokenConverter dtc = fileNamePattern.getDateTokenConverter();
if (dtc == null) {
throw new IllegalStateException("FileNamePattern ["
+ fileNamePattern.getPattern()
+ "] does not contain a valid DateToken");
}
int len = fileNamePatternStr.length();
switch (compressionMode) {
case GZ:
activeFileNamePattern = new FileNamePattern(fileNamePatternStr.substring(
0, len - 3), this.context);
break;
case ZIP:
activeFileNamePattern = new FileNamePattern(fileNamePatternStr.substring(
0, len - 4), this.context);
break;
case NONE:
activeFileNamePattern = fileNamePattern;
}
addInfo("Will use the pattern " + activeFileNamePattern
+ " for the active file");
rc = new RollingCalendar();
rc.init(dtc.getDatePattern());
addInfo("The date pattern is '" + dtc.getDatePattern()
+ "' from file name pattern '" + fileNamePattern.getPattern() + "'.");
rc.printPeriodicity(this);
// currentTime = System.currentTimeMillis();
lastCheck.setTime(getCurrentTime());
nextCheck = rc.getNextTriggeringMillis(lastCheck);
if (maxHistory != DEFAULT_MAX_HISTORY) {
tbCleaner = new TimeBasedCleaner(fileNamePattern, rc, maxHistory);
}
}
public void rollover() throws RolloverFailure {
// when rollover is called the elapsed period's file has
// been already closed. This is a working assumption of this method.
if (getParentFileName() == null && compressionMode != CompressionMode.NONE) {
doCompression(false, elapsedPeriodsFileName, elapsedPeriodsFileName);
} else {
if (compressionMode == CompressionMode.NONE) {
util.rename(getParentFileName(), elapsedPeriodsFileName);
} else {
doCompression(true, getParentFileName(), elapsedPeriodsFileName);
}
}
if (tbCleaner != null) {
tbCleaner.clean(new Date(getCurrentTime()));
}
// let's update the parent active file name
setParentFileName(getNewActiveFileName());
}
void doCompression(boolean rename, String nameOfFile2Compress,
String nameOfCompressedFile) throws RolloverFailure {
Compressor compressor = null;
if (rename) {
String renameTarget = nameOfFile2Compress + System.nanoTime() + ".tmp";
util.rename(getParentFileName(), renameTarget);
nameOfFile2Compress = renameTarget;
}
switch (compressionMode) {
case GZ:
addInfo("GZIP compressing [" + nameOfFile2Compress + "].");
compressor = new Compressor(CompressionMode.GZ, nameOfFile2Compress,
nameOfCompressedFile);
compressor.setContext(this.context);
break;
case ZIP:
addInfo("ZIP compressing [" + nameOfFile2Compress + "]");
compressor = new Compressor(CompressionMode.ZIP, nameOfFile2Compress,
nameOfCompressedFile);
compressor.setContext(this.context);
break;
}
AsynchronousCompressor ac = new AsynchronousCompressor(compressor);
future = ac.compressAsynchronously();
}
/**
*
* The active log file is determined by the value of the parent's filename
* option. However, in case the file name is left blank, then, the active log
* file equals the file name for the current period as computed by the
* <b>FileNamePattern</b> option.
*
* <p>
* The RollingPolicy must know wether it is responsible for changing the name
* of the active file or not. If the active file name is set by the user via
* the configuration file, then the RollingPolicy must let it like it is. If
* the user does not specify an active file name, then the RollingPolicy
* generates one.
*
* <p>
* To be sure that the file name used by the parent class has been generated
* by the RollingPolicy and not specified by the user, we keep track of the
* last generated name object and compare its reference to the parent file
* name. If they match, then the RollingPolicy knows it's responsible for the
* change of the file name.
*
*/
public String getNewActiveFileName() {
if (getParentFileName() == null
|| getParentFileName() == lastGeneratedFileName) {
String newName = activeFileNamePattern.convertDate(lastCheck);
addInfo("Generated a new name for RollingFileAppender: " + newName);
lastGeneratedFileName = newName;
return newName;
} else {
return getParentFileName();
}
}
public boolean isTriggeringEvent(File activeFile, final E event) {
long time = getCurrentTime();
if (time >= nextCheck) {
// addInfo("Time to trigger roll-over");
// We set the elapsedPeriodsFileName before we set the 'lastCheck'
// variable
// The elapsedPeriodsFileName corresponds to the file name of the period
// that just elapsed.
elapsedPeriodsFileName = activeFileNamePattern.convertDate(lastCheck);
// addInfo("elapsedPeriodsFileName set to "+elapsedPeriodsFileName);
lastCheck.setTime(time);
nextCheck = rc.getNextTriggeringMillis(lastCheck);
Date x = new Date();
x.setTime(nextCheck);
// addInfo("Next check on "+ x);
return true;
} else {
return false;
}
}
/**
* Get the number of archive files to keep.
*
* @return number of archive files to keep
*/
public int getMaxHistory() {
return maxHistory;
}
/**
* Set the maximum number of archive files to keep.
*
* @param maxHistory
* number of archive files to keep
*/
public void setMaxHistory(int maxHistory) {
this.maxHistory = maxHistory;
}
@Override
public String toString() {
return "c.q.l.core.rolling.TimeBasedRollingPolicy";
}
}