com.hazelcast.hibernate.access
Class ReadWriteAccessDelegate<T extends HazelcastRegion>

java.lang.Object
  com.hazelcast.hibernate.access.AbstractAccessDelegate<T>
      com.hazelcast.hibernate.access.ReadWriteAccessDelegate<T>

Type Parameters:

T - implementation type of HazelcastRegion

All Implemented Interfaces:

AccessDelegate<T>

public class ReadWriteAccessDelegate<T extends HazelcastRegion>
extends AbstractAccessDelegate<T>

Makes READ COMMITTED consistency guarantees even in a clustered environment.

Author:

Leo Kim (lkim@limewire.com)

Field Summary

Fields inherited from class com.hazelcast.hibernate.access.AbstractAccessDelegate

cache, hazelcastRegion, log, versionComparator

Constructor Summary

ReadWriteAccessDelegate(T hazelcastRegion, Properties props)

Method Summary

boolean	afterInsert(Object key, Object value, Object version) Called after an item has been inserted (after the transaction completes), instead of calling release().
boolean	afterUpdate(Object key, Object value, Object currentVersion, Object previousVersion, SoftLock lock) Called after an item has been updated (after the transaction completes), instead of calling release().
SoftLock	lockItem(Object key, Object version) We are going to attempt to update/delete the keyed object.
boolean	putFromLoad(Object key, Object value, long txTimestamp, Object version, boolean minimalPutOverride) Attempt to cache an object, after loading from the database, explicitly specifying the minimalPut behavior.
void	unlockItem(Object key, SoftLock lock) Called when we have finished the attempted update/delete (which may or may not have been successful), after transaction completion.
void	unlockRegion(SoftLock lock) NO-OP

Methods inherited from class com.hazelcast.hibernate.access.AbstractAccessDelegate

evict, evictAll, get, getHazelcastRegion, insert, lockRegion, put, putFromLoad, remove, removeAll, update, update

Methods inherited from class java.lang.Object

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

Constructor Detail

ReadWriteAccessDelegate

public ReadWriteAccessDelegate(T hazelcastRegion,
                               Properties props)

Method Detail

afterInsert

public boolean afterInsert(Object key,
                           Object value,
                           Object version)
                    throws org.hibernate.cache.CacheException

Description copied from interface: AccessDelegate

Called after an item has been inserted (after the transaction completes), instead of calling release(). This method is used by "asynchronous" concurrency strategies.

Parameters:

key - The item key

value - The item

version - The item's version value

Returns:

Were the contents of the cache actual changed by this operation?

Throws:

org.hibernate.cache.CacheException - Propogated from underlying org.hibernate.cache.Region

afterUpdate

public boolean afterUpdate(Object key,
                           Object value,
                           Object currentVersion,
                           Object previousVersion,
                           SoftLock lock)
                    throws org.hibernate.cache.CacheException

Called after an item has been updated (after the transaction completes), instead of calling release(). This method is used by "asynchronous" concurrency strategies.

Called after com.hazelcast.hibernate.access.ReadWriteAccessDelegate.lockItem()

Parameters:

key - The item key

value - The item

currentVersion - The item's current version value

previousVersion - The item's previous version value

lock - The lock previously obtained from AccessDelegate.lockItem(java.lang.Object, java.lang.Object)

Returns:

Were the contents of the cache actual changed by this operation?

Throws:

org.hibernate.cache.CacheException - Propogated from underlying org.hibernate.cache.Region

putFromLoad

public boolean putFromLoad(Object key,
                           Object value,
                           long txTimestamp,
                           Object version,
                           boolean minimalPutOverride)
                    throws org.hibernate.cache.CacheException

Description copied from interface: AccessDelegate

Attempt to cache an object, after loading from the database, explicitly specifying the minimalPut behavior.

Parameters:

key - The item key

value - The item

txTimestamp - a timestamp prior to the transaction start time

version - the item version number

minimalPutOverride - Explicit minimalPut flag

Returns:

true if the object was successfully cached

Throws:

org.hibernate.cache.CacheException - Propogated from underlying org.hibernate.cache.Region

lockItem

public SoftLock lockItem(Object key,
                         Object version)
                  throws org.hibernate.cache.CacheException

Description copied from interface: AccessDelegate

We are going to attempt to update/delete the keyed object. This method is used by "asynchronous" concurrency strategies.

The returned object must be passed back to release(), to release the lock. Concurrency strategies which do not support client-visible locks may silently return null.

Parameters:

key - The key of the item to lock

version - The item's current version value

Returns:

A representation of our lock on the item; or null.

Throws:

org.hibernate.cache.CacheException - Propogated from underlying org.hibernate.cache.Region

unlockItem

public void unlockItem(Object key,
                       SoftLock lock)
                throws org.hibernate.cache.CacheException

Description copied from interface: AccessDelegate

Called when we have finished the attempted update/delete (which may or may not have been successful), after transaction completion. This method is used by "asynchronous" concurrency strategies.

Parameters:

key - The item key

lock - The lock previously obtained from AccessDelegate.lockItem(java.lang.Object, java.lang.Object)

Throws:

org.hibernate.cache.CacheException - Propogated from underlying org.hibernate.cache.Region

unlockRegion

public void unlockRegion(SoftLock lock)
                  throws org.hibernate.cache.CacheException

Description copied from class: AbstractAccessDelegate

NO-OP

Specified by:

unlockRegion in interface AccessDelegate<T extends HazelcastRegion>

Overrides:

unlockRegion in class AbstractAccessDelegate<T extends HazelcastRegion>

Parameters:

lock - The lock previously obtained from AccessDelegate.lockRegion()

Throws:

org.hibernate.cache.CacheException - Propogated from underlying org.hibernate.cache.Region