Package com.nt.udc.util.state

Class AsynchronousStateSaver

java.lang.Object

com.nt.udc.util.state.StateSaver

com.nt.udc.util.state.AsynchronousStateSaver

All Implemented Interfaces:

IntegerCallback

public class AsynchronousStateSaver
extends StateSaver
implements IntegerCallback

The class will save the state of a set of registered Objects. The saving is done asynchronously, in that a new Thread is created for each call to save the Objects' state. Therefore, a call to "saveState()" requests the state to be saved - it does not guarantee the state will be saved within the time frame of that call. Also, all processing Objects are "frozen" will the StateFreezer prior to saving the state.

Field Summary

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

baseStateDir, logger, stateBufferFileName, stateBufferObjArray, stateDirComp, stateDirGenerator, stateDirObjArray, tmpFilter

Constructor Summary

Constructors

Constructor	Description
AsynchronousStateSaver(LoggerIfc logger, File baseStateDir, Object stateLock, StateFreezer freezer, TimedStateMerger stateMerger)	Creates an AsynchronousStateSaver Object.

Method Summary

Modifier and Type	Method	Description
void	callback(int callbackValue)	Tells this Objects that a save state thread has completed.
void	saveState(Callback stateSavedCallback)	Requests the state of the registered Objects to be saved, and returns immediately.
void	shutdown()	Stops the state saving Thread.

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

saveState, setBufferArray, setDirArray, setStateBufferFileName

Methods inherited from class java.lang.Object

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

Constructor Details

AsynchronousStateSaver

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

Creates an AsynchronousStateSaver Object.

Parameters:

logger - Logger for warnings and errors.

baseStateDir - Location of state sub-directories.

stateLock - Lock required to obtain before saving the state. This ensures no other state-related routines will be operating.

freezer - Used to freeze all processing Objects.

stateMerger - Used to merge the state directories.

Method Details

shutdown

public void shutdown()

Stops the state saving Thread.

saveState

public void saveState(Callback stateSavedCallback)

Requests the state of the registered Objects to be saved, and returns immediately. A separate thread will actually call "saveState()" on the registered Objects.

callback

public void callback(int callbackValue)

Tells this Objects that a save state thread has completed.

Specified by:

callback in interface IntegerCallback