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http://jira.qos.ch/browse/LBCORE-26?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=10860#action_10860
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Ceki Gulcu commented on LBCORE-26:
----------------------------------
Details for this commit can be seen at
http://svn.qos.ch/viewvc?root=svn&revision=1917&pathrev=1917&view=rev
> TimeBasedRollingPolicy append logs into a old log file, instead of rolling
> the log file.
> ----------------------------------------------------------------------------------------
>
> Key: LBCORE-26
> URL: http://jira.qos.ch/browse/LBCORE-26
> Project: logback-core
> Issue Type: Bug
> Components: Rolling
> Affects Versions: unspecified
> Environment: Operating System: All
> Platform: All
> Reporter: Tsutomu YANO
> Assignee: Logback dev list
> Priority: Critical
> Fix For: 0.9.12
>
>
> If you use TimeBasedRollingPolicy to rollover a log file and no log wasn't
> wrote into the log beyond the timing of rollover, and if you restart your
> application, the log file doesn't roll, then new log will be appended into
> old log file.
> EVIDENCE:
> 1. in logback.xml, set your FileNamePattern like
> 'log.%d{yyyy-MM-dd_HH-mm}.log'.
> 2. Simply do a kind of thing, which will make some logs into your log file.
> 3. Wait for some minutes.
> 4. restart your application.
> 5. do a kind of thing, which will make some logs into your log file.
> the FileNamePattern is 'log.%d{yyyy-MM-dd_HH-mm}.log', so the log file will
> be roll every minutes. On case 5 of above example, the log file should be
> roll over, because some minutes already have passed after last logs wrote
> into the log file. But the file didn't be roll overed.
> THE CAUSE:
> In start() method of TimeBasedRollingPolicy, you initialize a variable
> 'lastCheck' to System.currentTimeStamp(). So if you restart your
> application, the last check time will be set to just NOW.
> you should initialize the variable to a last modified time of a current log
> file.
> See below source code. from '//modified by Tsutomu YANO' to '//until here'.
> SOURCE:
> public void start() {
> // set the LR for our utility object
> util.setContext(this.context);
> compress.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 Compress.GZ:
> activeFileNamePattern = new
> FileNamePattern(fileNamePatternStr.substring(0, len - 3), this.context);
> break;
> case Compress.ZIP:
> activeFileNamePattern = new
> FileNamePattern(fileNamePatternStr.substring(0, len - 4), this.context);
> break;
> case Compress.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);
>
> //modified by Tsutomu YANO
> //if a current log file exists, initialize a 'lastCheck' variable to
> the
> //last modified date of the file.
> File currentFile = new File(getParentFileName());
> if(currentFile.exists() && currentFile.canRead()) {
> lastCheck.setTime(currentFile.lastModified());
> } else {
> // currentTime = System.currentTimeMillis();
> lastCheck.setTime(getCurrentTime());
> }
> //until here
>
> nextCheck = rc.getNextCheckMillis(lastCheck);
> // Date nc = new Date();
> // nc.setTime(nextCheck);
> }
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