Package org.eclipse.persistence.config

Class MergeManagerOperationMode

java.lang.Object

org.eclipse.persistence.config.MergeManagerOperationMode

public final class MergeManagerOperationMode
extends java.lang.Object

INTERNAL:

Purpose: It is data model behind SystemProperties.CONCURRENCY_MANAGER_ALLOW_GET_CACHE_KEY_FOR_MERGE_MODE or PersistenceUnitProperties.CONCURRENCY_MANAGER_ALLOW_GET_CACHE_KEY_FOR_MERGE_MODE.

Field Summary

Fields

Modifier and Type	Field	Description
static java.lang.String	ORIGIN	ORIGIN (DEFAULT) - There is infinite Object.wait() call in case of some conditions during time when object/entity referred from org.eclipse.persistence.internal.identitymaps.CacheKey is locked and modified by another thread.
static java.lang.String	WAITLOOP	WAITLOOP - Merge manager will try in the loop with timeout wait cacheKey.wait(ConcurrencyUtil.SINGLETON.getAcquireWaitTime()); fetch object/entity from CacheKey.

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

ORIGIN

public static final java.lang.String ORIGIN

ORIGIN (DEFAULT) - There is infinite Object.wait() call in case of some conditions during time when object/entity referred from org.eclipse.persistence.internal.identitymaps.CacheKey is locked and modified by another thread. In some cases it should leads into deadlock.

See Also:

Constant Field Values

WAITLOOP

public static final java.lang.String WAITLOOP

WAITLOOP - Merge manager will try in the loop with timeout wait cacheKey.wait(ConcurrencyUtil.SINGLETON.getAcquireWaitTime()); fetch object/entity from CacheKey. If fetch will be successful object/entity loop finish and continue with remaining code. If not @{code java.lang.InterruptedException} is thrown and caught and used CacheKey instance status is set into invalidation state. This strategy avoid deadlock issue, but there should be impact to the performance.

See Also:

Constant Field Values