/**
* Logback: the reliable, generic, fast and flexible logging framework.
* Copyright (C) 1999-2013, QOS.ch. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation.
*/
package ch.qos.logback.core.rolling.helper;
import java.io.File;
import java.util.Date;
import ch.qos.logback.core.CoreConstants;
import ch.qos.logback.core.pattern.Converter;
import ch.qos.logback.core.pattern.LiteralConverter;
import ch.qos.logback.core.spi.ContextAwareBase;
abstract public class DefaultArchiveRemover extends ContextAwareBase implements
ArchiveRemover {
static protected final long UNINITIALIZED = -1;
// aim for 64 days, except in case of hourly rollover
static protected final long INACTIVITY_TOLERANCE_IN_MILLIS = 64L * (long) CoreConstants.MILLIS_IN_ONE_DAY;
static final int MAX_VALUE_FOR_INACTIVITY_PERIODS = 14 * 24; // 14 days in case of hourly rollover
final FileNamePattern fileNamePattern;
final RollingCalendar rc;
int periodOffsetForDeletionTarget;
final boolean parentClean;
long lastHeartBeat = UNINITIALIZED;
public DefaultArchiveRemover(FileNamePattern fileNamePattern,
RollingCalendar rc) {
this.fileNamePattern = fileNamePattern;
this.rc = rc;
this.parentClean = computeParentCleaningFlag(fileNamePattern);
}
int computeElapsedPeriodsSinceLastClean(long nowInMillis) {
long periodsElapsed = 0;
if (lastHeartBeat == UNINITIALIZED) {
addInfo("first clean up after appender initialization");
periodsElapsed = rc.periodsElapsed(nowInMillis, nowInMillis + INACTIVITY_TOLERANCE_IN_MILLIS);
if (periodsElapsed > MAX_VALUE_FOR_INACTIVITY_PERIODS)
periodsElapsed = MAX_VALUE_FOR_INACTIVITY_PERIODS;
} else {
periodsElapsed = rc.periodsElapsed(lastHeartBeat, nowInMillis);
if (periodsElapsed < 1) {
addWarn("Unexpected periodsElapsed value " + periodsElapsed);
periodsElapsed = 1;
}
}
return (int) periodsElapsed;
}
public void clean(Date now) {
long nowInMillis = now.getTime();
int periodsElapsed = computeElapsedPeriodsSinceLastClean(nowInMillis);
lastHeartBeat = nowInMillis;
if (periodsElapsed > 1) {
addInfo("periodsElapsed = " + periodsElapsed);
}
for (int i = 0; i < periodsElapsed; i++) {
cleanByPeriodOffset(now, periodOffsetForDeletionTarget - i);
}
}
abstract void cleanByPeriodOffset(Date now, int periodOffset);
boolean computeParentCleaningFlag(FileNamePattern fileNamePattern) {
DateTokenConverter dtc = fileNamePattern.getPrimaryDateTokenConverter();
// if the date pattern has a /, then we need parent cleaning
if (dtc.getDatePattern().indexOf('/') != -1) {
return true;
}
// if the literal string subsequent to the dtc contains a /, we also
// need parent cleaning
Converter<Object> p = fileNamePattern.headTokenConverter;
// find the date converter
while (p != null) {
if (p instanceof DateTokenConverter) {
break;
}
p = p.getNext();
}
while (p != null) {
if (p instanceof LiteralConverter) {
String s = p.convert(null);
if (s.indexOf('/') != -1) {
return true;
}
}
p = p.getNext();
}
// no /, so we don't need parent cleaning
return false;
}
void removeFolderIfEmpty(File dir) {
removeFolderIfEmpty(dir, 0);
}
/**
* Will remove the directory passed as parameter if empty. After that, if the
* parent is also becomes empty, remove the parent dir as well but at most 3
* times.
*
* @param dir
* @param depth
*/
private void removeFolderIfEmpty(File dir, int depth) {
// we should never go more than 3 levels higher
if (depth >= 3) {
return;
}
if (dir.isDirectory() && FileFilterUtil.isEmptyDirectory(dir)) {
addInfo("deleting folder [" + dir + "]");
dir.delete();
removeFolderIfEmpty(dir.getParentFile(), depth + 1);
}
}
public void setMaxHistory(int maxHistory) {
this.periodOffsetForDeletionTarget = -maxHistory - 1;
}
}