Package com.sun.gjc.spi.base.datastructure

Class LRUCacheImpl

java.lang.Object

com.sun.gjc.spi.base.datastructure.LRUCacheImpl

All Implemented Interfaces:

Cache

Direct Known Subclasses:

FIXEDCacheImpl

public class LRUCacheImpl
extends Object
implements Cache

Author:

Shalini M

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	LRUCacheImpl.CacheEntry	Cache object that has an entry.

Field Summary

Fields

Modifier and Type	Field	Description
protected static Logger	_logger

Constructor Summary

Constructors

Constructor	Description
LRUCacheImpl(PoolInfo poolInfo, int maxSize)

Method Summary

Modifier and Type	Method	Description
void	addToCache(CacheObjectKey key, Object o, boolean force)	Add the key and entry value into the cache.
Object	checkAndUpdateCache(CacheObjectKey key)	Check if an entry is found for this key object.
void	clearCache()	Clears the statement cache
void	flushCache()	Closing all statements in statement cache and flush the statement cache of all the statements.
int	getMaxSize()
int	getSize()	Returns the number of entries in the statement cache
boolean	isSynchronized()	Check if the statement cache is synchronized.
void	purge()	Remove all statements stored in the statement cache after closing the statement objects.
void	purge(Object obj)	Remove the specified entry stored in the statement cache after closing the statement object associated with this entry.

Methods inherited from class java.lang.Object

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

Field Detail

_logger

protected static final Logger _logger

Constructor Detail

LRUCacheImpl

public LRUCacheImpl(PoolInfo poolInfo,
                    int maxSize)

Method Detail

checkAndUpdateCache

public Object checkAndUpdateCache(CacheObjectKey key)

Check if an entry is found for this key object. If found, the entry is put in the result object and back into the list.

Specified by:

checkAndUpdateCache in interface Cache

Parameters:

key - key whose mapping entry is to be checked.

Returns:

result object that contains the key with the entry if not null when (1) object not found in cache

addToCache

public void addToCache(CacheObjectKey key,
                       Object o,
                       boolean force)

Add the key and entry value into the cache.

Specified by:

addToCache in interface Cache

Parameters:

key - key that contains the sql string and its type (PS/CS)

o - entry that is the wrapper of PreparedStatement or CallableStatement

force - If the already existing key is to be overwritten

clearCache

public void clearCache()

Clears the statement cache

Specified by:

clearCache in interface Cache

flushCache

public void flushCache()

Description copied from interface: Cache

Closing all statements in statement cache and flush the statement cache of all the statements. Used when a physical connection to the underlying resource manager is destroyed.

Specified by:

flushCache in interface Cache

purge

public void purge()

Description copied from interface: Cache

Remove all statements stored in the statement cache after closing the statement objects. Used when the statement cache size exceeds user defined maximum cache size.

Specified by:

purge in interface Cache

purge

public void purge(Object obj)

Description copied from interface: Cache

Remove the specified entry stored in the statement cache after closing the statement object associated with this entry. Used when statement is being reclaimed and is being used for the subsequent requests from the application.

Specified by:

purge in interface Cache

getSize

public int getSize()

Returns the number of entries in the statement cache

Specified by:

getSize in interface Cache

Returns:

has integer value

getMaxSize

public int getMaxSize()

isSynchronized

public boolean isSynchronized()

Description copied from interface: Cache

Check if the statement cache is synchronized.

Specified by:

isSynchronized in interface Cache

Returns:

boolean synchronized flag.