com.hazelcast.hibernate.access

Class ReadOnlyAccessDelegate<T extends HazelcastRegion>

java.lang.Object

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

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

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

Type Parameters:

T - implementation type of HazelcastRegion

All Implemented Interfaces:

AccessDelegate<T>

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

Guarantees that view is read-only and no updates can be made

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
ReadOnlyAccessDelegate(T hazelcastRegion, Properties props)

Method Summary

Methods

Modifier and Type	Method and Description
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.
SoftLock	lockRegion() NO-OP
void	unlockItem(Object key, SoftLock lock) This will issue a log warning stating that an attempt was made to unlock an item from a read-only cache region.
void	unlockRegion(SoftLock lock) This will issue a log warning stating that an attempt was made to unlock a read-only cache region.
boolean	update(Object key, Object value, Object currentVersion, Object previousVersion) This is an asynchronous cache access strategy.

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

afterInsert, putFromLoad

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

ReadOnlyAccessDelegate

public ReadOnlyAccessDelegate(T hazelcastRegion,
                      Properties props)

Method Detail

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.

Specified by:

afterUpdate in interface AccessDelegate<T extends HazelcastRegion>

Overrides:

afterUpdate in class NonStrictReadWriteAccessDelegate<T extends HazelcastRegion>

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:

UnsupportedOperationException

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.

Specified by:

lockItem in interface AccessDelegate<T extends HazelcastRegion>

Overrides:

lockItem in class NonStrictReadWriteAccessDelegate<T extends HazelcastRegion>

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:

UnsupportedOperationException

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

lockRegion

public SoftLock lockRegion()
                    throws org.hibernate.cache.CacheException

Description copied from class: AbstractAccessDelegate

NO-OP

Specified by:

lockRegion in interface AccessDelegate<T extends HazelcastRegion>

Overrides:

lockRegion in class AbstractAccessDelegate<T extends HazelcastRegion>

Returns:

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

Throws:

UnsupportedOperationException

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

unlockItem

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

This will issue a log warning stating that an attempt was made to unlock an item from a read-only cache region.

Specified by:

unlockItem in interface AccessDelegate<T extends HazelcastRegion>

Overrides:

unlockItem in class NonStrictReadWriteAccessDelegate<T extends HazelcastRegion>

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

This will issue a log warning stating that an attempt was made to unlock a read-only cache region.

Specified by:

unlockRegion in interface AccessDelegate<T extends HazelcastRegion>

Overrides:

unlockRegion in class NonStrictReadWriteAccessDelegate<T extends HazelcastRegion>

Parameters:

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

Throws:

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

update

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

Description copied from class: AbstractAccessDelegate

This is an asynchronous cache access strategy. NO-OP

Specified by:

update in interface AccessDelegate<T extends HazelcastRegion>

Overrides:

update in class AbstractAccessDelegate<T extends HazelcastRegion>

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?

Throws:

UnsupportedOperationException

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