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NonstrictReadWriteCache (Hibernate API Documentation) - Hibernate 2.1.8 正式版 API 英文文档

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net.sf.hibernate.cache
Class NonstrictReadWriteCache

java.lang.Object
  net.sf.hibernate.cache.NonstrictReadWriteCache

All Implemented Interfaces:

CacheConcurrencyStrategy

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public class NonstrictReadWriteCache

extends Object

implements CacheConcurrencyStrategy

Caches data that is sometimes updated without ever locking the cache. If concurrent access to an item is possible, this concurrency strategy makes no guarantee that the item returned from the cache is the latest version available in the database. Configure your cache timeout accordingly! This is an "asynchronous" concurrency strategy.

Author:

Gavin King

See Also:

for a much stricter algorithm

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Nested Class Summary

 

Nested classes inherited from class net.sf.hibernate.cache.CacheConcurrencyStrategy

CacheConcurrencyStrategy.SoftLock

 

Constructor Summary

NonstrictReadWriteCache()

 

Method Summary
void	afterInsert(Object key, Object value, Object version)           Do nothing.
void	afterUpdate(Object key, Object value, Object version, CacheConcurrencyStrategy.SoftLock lock)           Invalidate the item (again, for safety).
void	clear()           Evict all items from the cache immediately.
void	destroy()           Clean up all resources.
void	evict(Object key)           Invalidate the item
Object	get(Object key, long txTimestamp)           Get the most recent version, if available.
void	insert(Object key, Object value)           Do nothing.
CacheConcurrencyStrategy.SoftLock	lock(Object key, Object version)           Do nothing.
boolean	put(Object key, Object value, long txTimestamp, Object version, Comparator versionComparator)           Add an item to the cache.
void	release(Object key, CacheConcurrencyStrategy.SoftLock lock)           Invalidate the item (again, for safety).
void	remove(Object key)           Evict an item from the cache immediately (without regard for transaction isolation).
void	setCache(Cache cache)           Set the underlying cache implementation.
void	setMinimalPuts(boolean minimalPuts)           Enable "minimal puts" mode for this cache
void	update(Object key, Object value)           Invalidate the item

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

NonstrictReadWriteCache

public NonstrictReadWriteCache()

Method Detail

setCache

public void setCache(Cache cache)

Description copied from interface: CacheConcurrencyStrategy

Set the underlying cache implementation.

Specified by:

setCache in interface CacheConcurrencyStrategy

Parameters:

cache -

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get

public Object get(Object key,
                  long txTimestamp)
           throws CacheException

Get the most recent version, if available.

Specified by:

get in interface CacheConcurrencyStrategy

Parameters:

key -

txTimestamp - a timestamp prior to the transaction start time

Returns:

the cached object or null

Throws:

CacheException

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put

public boolean put(Object key,
                   Object value,
                   long txTimestamp,
                   Object version,
                   Comparator versionComparator)
            throws CacheException

Add an item to the cache.

Specified by:

put in interface CacheConcurrencyStrategy

Parameters:

key -

value -

txTimestamp - a timestamp prior to the transaction start time

version - the version number of the object we are putting

versionComparator - a Comparator to be used to compare version numbers

Returns:

true if the object was successfully cached

Throws:

CacheException

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lock

public CacheConcurrencyStrategy.SoftLock lock(Object key,
                                              Object version)
                                       throws CacheException

Do nothing.

Specified by:

lock in interface CacheConcurrencyStrategy

Parameters:

key -

version -

Returns:

null, no lock

Throws:

CacheException

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remove

public void remove(Object key)
            throws CacheException

Description copied from interface: CacheConcurrencyStrategy

Evict an item from the cache immediately (without regard for transaction isolation).

Specified by:

remove in interface CacheConcurrencyStrategy

Parameters:

key -

Throws:

CacheException

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clear

public void clear()
           throws CacheException

Description copied from interface: CacheConcurrencyStrategy

Evict all items from the cache immediately.

Specified by:

clear in interface CacheConcurrencyStrategy

Throws:

CacheException

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destroy

public void destroy()

Description copied from interface: CacheConcurrencyStrategy

Clean up all resources.

Specified by:

destroy in interface CacheConcurrencyStrategy

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evict

public void evict(Object key)
           throws CacheException

Invalidate the item

Specified by:

evict in interface CacheConcurrencyStrategy

Throws:

CacheException

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update

public void update(Object key,
                   Object value)
            throws CacheException

Invalidate the item

Specified by:

update in interface CacheConcurrencyStrategy

Throws:

CacheException

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insert

public void insert(Object key,
                   Object value)
            throws CacheException

Do nothing.

Specified by:

insert in interface CacheConcurrencyStrategy

Throws:

CacheException

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release

public void release(Object key,
                    CacheConcurrencyStrategy.SoftLock lock)
             throws CacheException

Invalidate the item (again, for safety).

Specified by:

release in interface CacheConcurrencyStrategy

Parameters:

key -

Throws:

CacheException

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afterUpdate

public void afterUpdate(Object key,
                        Object value,
                        Object version,
                        CacheConcurrencyStrategy.SoftLock lock)
                 throws CacheException

Invalidate the item (again, for safety).

Specified by:

afterUpdate in interface CacheConcurrencyStrategy

Throws:

CacheException

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afterInsert

public void afterInsert(Object key,
                        Object value,
                        Object version)
                 throws CacheException

Do nothing.

Specified by:

afterInsert in interface CacheConcurrencyStrategy

Throws:

CacheException

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setMinimalPuts

public void setMinimalPuts(boolean minimalPuts)
                    throws HibernateException

Description copied from interface: CacheConcurrencyStrategy

Enable "minimal puts" mode for this cache

Specified by:

setMinimalPuts in interface CacheConcurrencyStrategy

Throws:

HibernateException

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