org.mapdb
Class EngineWrapper.CloseOnJVMShutdown

java.lang.Object
  org.mapdb.EngineWrapper
      org.mapdb.EngineWrapper.CloseOnJVMShutdown

All Implemented Interfaces:

Engine

Enclosing class:

EngineWrapper

public static class EngineWrapper.CloseOnJVMShutdown
extends EngineWrapper

Closes Engine on JVM shutdown using shutdown hook: Runtime.addShutdownHook(Thread) If engine was closed by user before JVM shutdown, hook is removed to save memory.

Nested Class Summary

Nested classes/interfaces inherited from class org.mapdb.EngineWrapper

EngineWrapper.CloseOnJVMShutdown, EngineWrapper.ImmutabilityCheckEngine, EngineWrapper.ReadOnlyEngine, EngineWrapper.SerializerCheckEngineWrapper, EngineWrapper.SynchronizedEngineWrapper

Field Summary

protected AtomicBoolean

shutdownHappened

Fields inherited from class org.mapdb.EngineWrapper

CLOSED

Fields inherited from interface org.mapdb.Engine

CATALOG_RECID, CHECK_RECORD, CLASS_INFO_RECID, LAST_RESERVED_RECID

Constructor Summary

EngineWrapper.CloseOnJVMShutdown(Engine engine)

Method Summary

void	close() Close store/cache.

Methods inherited from class org.mapdb.EngineWrapper

canRollback, canSnapshot, checkClosed, clearCache, closeListenerRegister, closeListenerUnregister, commit, compact, compareAndSwap, delete, get, getSerializerPojo, getWrappedEngine, isClosed, isReadOnly, preallocate, preallocate, put, rollback, snapshot, update

Methods inherited from class java.lang.Object

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

Field Detail

shutdownHappened

protected final AtomicBoolean shutdownHappened

Constructor Detail

EngineWrapper.CloseOnJVMShutdown

public EngineWrapper.CloseOnJVMShutdown(Engine engine)

Method Detail

close

public void close()

Description copied from interface: Engine

Close store/cache. This method must be called before JVM exits to flush all caches and prevent store corruption. Also it releases resources used by MapDB (disk, memory..).

Engine can no longer be used after this method was called. If Engine is used after closing, it may throw any exception including NullPointerException

There is an configuration option DBMaker.closeOnJvmShutdown() which uses shutdown hook to automatically close Engine when JVM shutdowns.

Specified by:

close in interface Engine

Overrides:

close in class EngineWrapper