Examples of com.linkedin.databus.core.TrailFilePositionSetter$FileFilter

com.linkedin.databus.core.TrailFilePositionSetter
Helper Class to find the position (filename, fileByteOffset) where a transaction with a requested SCN (or the next monotonically increasing SCN)starts. The requested SCN can have 2 special values: 1. -1 : This SCN would mean the client is requesting to position to the last completely written transaction in the trail file. 2. -2 : This SCN would mean the client is requesting to position to the first available transaction in the trail File. The main API to us is the {@link getFilePosition()} which will locate the transaction given a SCN

  private ConcurrentAppendableCompositeFileInputStream locateScnInTrailFile(String xmlDir, String xmlPrefix)
      throws Exception
  {
    ConcurrentAppendableCompositeFileInputStream compositeInputStream = null;
    TrailFilePositionSetter.FilePositionResult filePositionResult = null;
    TrailFilePositionSetter trailFilePositionSetter = null;


    while(compositeInputStream == null)
    {


      _log.info("Requesting trail file position setter for scn: " + _scn.get());
      trailFilePositionSetter = new TrailFilePositionSetter(xmlDir,xmlPrefix, getName());
      filePositionResult = trailFilePositionSetter.locateFilePosition(_scn.get(), new GGXMLTrailTransactionFinder());
      _log.info("File position at : "+ filePositionResult);
      switch(filePositionResult.getStatus())
      {
        case ERROR:
          _log.fatal("Unable to locate the scn in the trail file.");

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    _continuous = continuous;
    _dtdValidationEnabled = dtdValidationEnabled;
    _enableRegex = enableRegex;


    //find the start of the oldest transaction
    _trailFilePositionSetter = new TrailFilePositionSetter(xmlDir, xmlPrefix);
    _filePositionResult = _trailFilePositionSetter.locateFilePosition(
        TrailFilePositionSetter.USE_EARLIEST_SCN, new GGXMLTrailTransactionFinder(_enableRegex));


    LOG.info("starting from position " + _filePositionResult);

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