Examples of org.objectweb.howl.log.Logger

org.objectweb.howl.log.Logger
Manage a configured set of two or more physical log files.
Log files have a configured maximum size. When a file has reached the configured capacity, Logger switches to the next available alternate file. Normally, log files are created in advance to guarantee that space is available during execution.
Each log file has a file header containing information allowing Logger to reposition and replay the logs during a recovery scenario.
LogFile marking
The LogFile's mark is the the position within the file of the oldest active entry. Initially the mark is set at the beginning of the file. At some configured interval, the caller invokes mark() with the key of the oldest active entry in the log.
For XA the key would be for the oldest transaction still in committing state. In theory, XA could call mark() every time a DONE record is logged. In practice, it should only be necessary to call mark() every minute or so depending on the capacity of the log files.
The Logger maintains an active mark within the set of log files. A file may be reused only if the mark does not reside within the file. The Logger will throw LogFileOverflowException if an attempt is made to switch to a file that contains a mark. @author Michael Giroux

        setMaxBlocksPerFile(maxBlocksPerFile);
        setMaxBuffers(maxBuffers);
        setMaxLogFiles(maxLogFiles);
        setMinBuffers(minBuffers);
        setThreadsWaitingForceThreshold(threadsWaitingForceThreshold);
        this.logger = new Logger(configuration);
    }

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    // Implementation methods
    //-------------------------------------------------------------------------


    protected Logger createTransactionLog() throws IOException, LogConfigurationException {
        return new Logger(getConfiguration());
    }

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  public HowlJournal(Configuration configuration)
      throws InvalidFileSetException, LogConfigurationException,
      InvalidLogBufferException, ClassNotFoundException, IOException,
      InterruptedException {
    this.logger = new Logger(configuration);
    this.logger.open();
  }

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  public HowlJournal(Configuration configuration)
      throws InvalidFileSetException, LogConfigurationException,
      InvalidLogBufferException, ClassNotFoundException, IOException,
      InterruptedException {
    this.logger = new Logger(configuration);
    this.logger.open();
    lastMark = new LongRecordLocation(logger.getActiveMark());
  }

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    // Implementation methods
    //-------------------------------------------------------------------------


    protected Logger createTransactionLog() throws IOException, LogConfigurationException {
        return new Logger(getConfiguration());
    }

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  public HowlJournal(Configuration configuration)
      throws InvalidFileSetException, LogConfigurationException,
      InvalidLogBufferException, ClassNotFoundException, IOException,
      InterruptedException {
    this.logger = new Logger(configuration);
    this.logger.open();
    lastMark = new LongRecordLocation(logger.getActiveMark());
  }

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  public HowlJournal(Configuration configuration)
      throws InvalidFileSetException, LogConfigurationException,
      InvalidLogBufferException, ClassNotFoundException, IOException,
      InterruptedException {
    this.logger = new Logger(configuration);
    this.logger.open();
    lastMark = new LongRecordLocation(logger.getActiveMark());
  }

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