Examples of org.codehaus.activemq.journal.impl.JournalImpl

org.codehaus.activemq.journal.impl.JournalImpl

objectweb.org/">Howl project but tailored to the needs of ActiveMQ.

This Journal provides the following features:

Conncurrent writes are batched into a single write/force done by a background thread.
Uses preallocated logs to avoid disk fragmentation and performance degregation.
The number and size of the preallocated logs are configurable.
Uses direct ByteBuffers to write data to log files.
Allows logs to grow in case of an overflow condition so that overflow exceptions are not not thrown. Grown logs that are inactivated (due to a new mark) are resized to thier original size.
No limit on the size of the record written to the journal
Should be possible to extend so that multiple physical disk are used concurrently to increase throughput and decrease latency.

This class is a thing wrapper around a LogFileManager. It may be possible to extends this class so that it manages multiple LogFileManager objects to allow logging to multiple physical disks. @version $Revision: 1.3 $




    // Implementation methods
//-------------------------------------------------------------------------
    private Journal createJournal() throws IOException {
        return new JournalImpl(directory);
    }

        this.journalType = journalType;
    }


    protected Journal createJournal() throws IOException {
        if( DEFAULT_JOURNAL_TYPE.equals(journalType) ) {
            return new JournalImpl(directory);
        }
        if( HOWL_JOURNAL_TYPE.equals(journalType) ) {
            try {
                Configuration config = new Configuration();
                config.setLogFileDir(directory.getCanonicalPath());

Related Classes of org.codehaus.activemq.journal.impl.JournalImpl

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