com.hazelcast.hibernate.access

Class NonStrictReadWriteAccessDelegate<T extends HazelcastRegion>

java.lang.Object

com.hazelcast.hibernate.access.AbstractAccessDelegate<T>

com.hazelcast.hibernate.access.NonStrictReadWriteAccessDelegate<T>

Type Parameters:

T - implementation type of HazelcastRegion

All Implemented Interfaces:

AccessDelegate<T>

Direct Known Subclasses:

ReadOnlyAccessDelegate

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

Makes no guarantee of consistency between the cache and the database. Stale data from the cache is possible if expiry is not configured appropriately.

Author:

Leo Kim (lkim@limewire.com)

Field Summary

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

cache, hazelcastRegion, log, versionComparator

Constructor Summary

Constructors

Constructor and Description
NonStrictReadWriteAccessDelegate(T hazelcastRegion, Properties props)

Method Summary

Methods

Modifier and Type	Method and Description
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().
boolean	insert(Object key, Object value, Object version) Called after an item has been inserted (before the transaction completes), instead of calling evict().
SoftLock	lockItem(Object key, Object version) We are going to attempt to update/delete the keyed object.
void	remove(Object key) Called after an item has become stale (before the transaction completes).
void	removeAll() Called to evict data from the entire region
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.
boolean	update(Object key, Object value, Object currentVersion, Object previousVersion) Called after an item has been updated (before the transaction completes), instead of calling evict().

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

evict, evictAll, get, getHazelcastRegion, lockRegion, putFromLoad, putFromLoad, unlockRegion

Methods inherited from class java.lang.Object

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

Constructor Detail

NonStrictReadWriteAccessDelegate

public NonStrictReadWriteAccessDelegate(T hazelcastRegion,
                                Properties props)

Method Detail

afterInsert

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

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

Returns false since this is a non-strict read/write cache access strategy

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 - Propagated 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

Description copied from interface: AccessDelegate

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

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 - Propagated from underlying org.hibernate.cache.Region

insert

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

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

Returns false since this is an asynchronous cache access strategy.

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 - Propagated from underlying org.hibernate.cache.Region

update

public boolean update(Object key,
             Object value,
             Object currentVersion,
             Object previousVersion)

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

Removes the entry since this is a non-strict read/write cache strategy.

Parameters:

key - The item key

value - The item

currentVersion - The item's current version value

previousVersion - The item's previous version value

Returns:

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

remove

public void remove(Object key)
            throws org.hibernate.cache.CacheException

Description copied from interface: AccessDelegate

Called after an item has become stale (before the transaction completes). This method is used by "synchronous" concurrency strategies.

Parameters:

key - The key of the item to remove

Throws:

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

removeAll

public void removeAll()
               throws org.hibernate.cache.CacheException

Description copied from interface: AccessDelegate

Called to evict data from the entire region

Throws:

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