Mercurial > hg > blitz_stable
diff src/org/dancres/blitz/txn/CheckpointTrigger.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 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/org/dancres/blitz/txn/CheckpointTrigger.java Sat Mar 21 11:00:06 2009 +0000 @@ -0,0 +1,26 @@ +package org.dancres.blitz.txn; + +import org.dancres.blitz.ActiveObject; + +/** + <p>Checkpoints can be triggered as the result of a number of different + stimuli. Typically, these stimuli are the number of operations since the + last checkpoint or the time since the last checkpoint.</p> + + <p>Instances of this class encapsulate a particular policy with respect to + when a checkpoint should be triggered. When they determine that a + checkpoint is required, they invoke the <code>sync</code> of a + <code>Checkpointer</code> instance (typically passed in at construction + time). This call should be made in an independent thread - i.e. it is + <em>not</em> appropriate for CheckpointTrigger methods to block.</p> + + @see org.dancres.blitz.txn.Checkpointer + */ +public interface CheckpointTrigger extends ActiveObject { + public void loggedCommand(); + + /** + @return <code>true</code> if checkpointing is not allowed. + */ + public boolean checkpointsDisabled(); +}