Mercurial > hg > blitz_condensed
diff src/org/dancres/blitz/txn/PersistentPersonality.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
parents | |
children | 4580bb12db30 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/org/dancres/blitz/txn/PersistentPersonality.java Sat Mar 21 11:00:06 2009 +0000 @@ -0,0 +1,87 @@ +package org.dancres.blitz.txn; + +import java.util.logging.Level; + +import org.prevayler.implementation.SnapshotPrevayler; +import org.prevayler.implementation.SnapshotPrevaylerImpl; + +import org.prevayler.PrevalentSystem; + +import org.dancres.blitz.config.Persistent; + +import org.dancres.blitz.disk.Disk; + +import org.dancres.blitz.txn.batch.*; + +/** + Understands how to translate Persistent into core component configuration. + + @see org.dancres.blitz.config.Persistent + */ +class PersistentPersonality implements StoragePersonality { + private Persistent theModel; + private String theLogDir; + + PersistentPersonality(Persistent aModel, String aLogDir) { + theModel = aModel; + theLogDir = aLogDir; + + TxnManager.theLogger.log(Level.INFO, "PersistentPersonality"); + TxnManager.theLogger.log(Level.INFO, "Max logs before sync: " + + theModel.getMaxLogsBeforeSync()); + TxnManager.theLogger.log(Level.INFO, "Reset log stream: " + + theModel.shouldResetLogStream()); + TxnManager.theLogger.log(Level.INFO, "Write barrier window: " + + theModel.getBatchWriteWindowSize()); + + if (theModel.useConcurrentWriteBatcher()) + TxnManager.theLogger.log(Level.INFO, + "*** Using concurrent batcher ***"); + + if (theModel.shouldCleanLogs()) { + TxnManager.theLogger.log(Level.WARNING, + "*** Automatically cleaning logs *** [EXPERIMENTAL]"); + } + + Disk.init(); + } + + public CheckpointTrigger getCheckpointTrigger(Checkpointer aCheckpointer) { + return + new OpCountingCheckpointTrigger(aCheckpointer, + theModel.getMaxLogsBeforeSync()); + } + + public SnapshotPrevayler getPrevayler(PrevalentSystem aSystem) + throws Exception { + + PersistentReboot myReboot = new PersistentReboot(theModel); + myReboot.execute(); + + SnapshotPrevayler myPrevayler = + new SnapshotPrevaylerImpl(aSystem, + theLogDir, + theModel.shouldResetLogStream(), + theModel.shouldCleanLogs(), + theModel.getLogBufferSize()); + + if (theModel.getBatchWriteWindowSize() != 0) { + int myWindowSize = theModel.getBatchWriteWindowSize(); + + if (theModel.useConcurrentWriteBatcher()) { + myPrevayler = + new ConcurrentWriteBatcher(myPrevayler, myWindowSize); + } else { + myPrevayler = + new WriteBatcher(myPrevayler, myWindowSize); + } + } + + return myPrevayler; + } + + public void destroy() { + Disk.destroy(); + Disk.clean(theLogDir); + } +}