Package com.nt.udc.util.state

Class TimedStateMerger

java.lang.Object

com.nt.udc.util.state.StateMerger

com.nt.udc.util.state.TimedStateMerger

All Implemented Interfaces:

ActionListener, EventListener

public class TimedStateMerger
extends StateMerger
implements ActionListener

This class is responsible for merging state directories together into a single merged directory. A timer has been provided for those situations where a periodic merge needs to occur. Otherwise, one may call for a merge explicitly. In order to prevent unnecessary merges when using the periodic merge timer, the merge timer will set a flag that the merge was successful. The flag prevents a merge from occurring, unless one has been requested. The user must call "setMergeNeeded()" if a merge is needed.

Field Summary

Fields inherited from class com.nt.udc.util.state.StateMerger

baseStateDir, dirCleaner, logger, mergeDirGenerator, stateBufferFileName, stateDirComp, stateDirObjArray, tmpAcceptFilter, tmpFilter

Constructor Summary

Constructors

Constructor	Description
TimedStateMerger(LoggerIfc logger, File baseStateDir, Object stateLock, StateFreezer freezer)	Creates a state directory merger.

Method Summary

Modifier and Type	Method	Description
void	actionPerformed(ActionEvent ae)	Responds for the periodic merging Thread.
void	mergeState()	Merges all the existing states.
void	setMergeDelay(int delay)	Sets the merge timer's delay.
void	setMergeNeeded()	Sets a flag to tell the periodic merge that a merge is required.
void	shutdown()	Shuts down the merge timer, and closes any other resources that are associated with the merger.
void	start()	Starts the merge timer.

Methods inherited from class com.nt.udc.util.state.StateMerger

mergeStateData, setDirArray, setStateBufferFileName

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

TimedStateMerger

public TimedStateMerger(LoggerIfc logger,
 File baseStateDir,
 Object stateLock,
 StateFreezer freezer)

Creates a state directory merger.

Parameters:

logger - Logger for warnings or errors.

baseStateDir - Root directory that holds the state directories.

stateLock - Lock needed when trying to merge states. This will prevent any other threads from modifying the state while merging.

stateFreezer - Used for freezing the state of the routine.

Method Details

start

public void start()

Starts the merge timer.

shutdown

public void shutdown()

Shuts down the merge timer, and closes any other resources that are associated with the merger.

setMergeDelay

public void setMergeDelay(int delay)

Sets the merge timer's delay.

Parameters:

delay - Delay, in ms.

setMergeNeeded

public void setMergeNeeded()

Sets a flag to tell the periodic merge that a merge is required.

actionPerformed

public void actionPerformed(ActionEvent ae)

Responds for the periodic merging Thread.

Specified by:

actionPerformed in interface ActionListener

mergeState

public void mergeState()

Merges all the existing states.