Package org.apache.bookkeeper.bookie

Class UncleanShutdownDetectionImpl

java.lang.Object

org.apache.bookkeeper.bookie.UncleanShutdownDetectionImpl

All Implemented Interfaces:

UncleanShutdownDetection

public class UncleanShutdownDetectionImpl
extends java.lang.Object
implements UncleanShutdownDetection

Used to determine if the prior shutdown was unclean or not. It does so by adding a file to each ledger directory after successful start-up and removing the file on graceful shutdown. Any abrupt termination will cause one or more of these files to not be cleared and so on the subsequent boot-up, the presence of any of these files will indicate an unclean shutdown.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static java.lang.String	DIRTY_FILENAME

Constructor Summary

Constructors

Constructor	Description
UncleanShutdownDetectionImpl(LedgerDirsManager ledgerDirsManager)

Method Summary

Modifier and Type	Method	Description
boolean	lastShutdownWasUnclean()
void	registerCleanShutdown()
void	registerStartUp()

Methods inherited from class java.lang.Object

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

Field Detail

DIRTY_FILENAME

static final java.lang.String DIRTY_FILENAME

See Also:

Constant Field Values

Constructor Detail

UncleanShutdownDetectionImpl

public UncleanShutdownDetectionImpl(LedgerDirsManager ledgerDirsManager)

Method Detail

registerStartUp

public void registerStartUp()
                     throws java.io.IOException

Specified by:

registerStartUp in interface UncleanShutdownDetection

Throws:

java.io.IOException

registerCleanShutdown

public void registerCleanShutdown()

Specified by:

registerCleanShutdown in interface UncleanShutdownDetection

lastShutdownWasUnclean

public boolean lastShutdownWasUnclean()

Specified by:

lastShutdownWasUnclean in interface UncleanShutdownDetection