org.ow2.jonas.resource.internal.cm.sql.cache
Class PreparedStatementMapCacheImpl

java.lang.Object
  org.ow2.jonas.resource.internal.cm.sql.cache.AbstractPreparedStatementCacheImpl
      org.ow2.jonas.resource.internal.cm.sql.cache.PreparedStatementMapCacheImpl

All Implemented Interfaces:

PreparedStatementCache

public class PreparedStatementMapCacheImpl
extends AbstractPreparedStatementCacheImpl
implements PreparedStatementCache

Map cache implementation A Pstmt key is used to index the entries A LinkedHashMap is used to implement the LRU algorithm when entries must be freed (no more space)

Author:

pelletib

Field Summary

Map<PreparedStatementMapCacheKey,List<PreparedStatementWrapper>>

pStmts Cache

Fields inherited from class org.ow2.jonas.resource.internal.cm.sql.cache.AbstractPreparedStatementCacheImpl

cacheLogger, LOCAL_STATISTIC_KEY, maxPstmtCacheSize, pstmtCacheSize, stats

Fields inherited from interface org.ow2.jonas.resource.internal.cm.sql.cache.PreparedStatementCache

CACHE_POLICY_LIST, CACHE_POLICY_MAP

Constructor Summary

PreparedStatementMapCacheImpl(int maxCacheSize, PreparedStatementCacheStatistics pstmtStats, org.objectweb.util.monolog.api.Logger logger)
Constructor

Method Summary

void	close() Close all the cache entries
void	destroy() Destroy all the cache entries
PreparedStatementWrapper	get(PreparedStatementWrapper psw) Retrieve an entry in the cache
String	getState(String prefix) Dump the pstmt cache state
void	put(PreparedStatementWrapper psw) Put a pstmt in the cache.
void	reallyClose() Close all the cache entries

Methods inherited from class org.ow2.jonas.resource.internal.cm.sql.cache.AbstractPreparedStatementCacheImpl

getMaxPstmtCacheSize, getPstmtCacheSize, setMaxPstmtCacheSize

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.ow2.jonas.resource.internal.cm.sql.cache.PreparedStatementCache

getMaxPstmtCacheSize, getPstmtCacheSize, setMaxPstmtCacheSize

Field Detail

pStmts

public Map<PreparedStatementMapCacheKey,List<PreparedStatementWrapper>> pStmts

Cache

Constructor Detail

PreparedStatementMapCacheImpl

public PreparedStatementMapCacheImpl(int maxCacheSize,
                                     PreparedStatementCacheStatistics pstmtStats,
                                     org.objectweb.util.monolog.api.Logger logger)

Constructor

Parameters:

maxCacheSize - max cache size

logger - trace logger

Method Detail

get

public PreparedStatementWrapper get(PreparedStatementWrapper psw)

Description copied from interface: PreparedStatementCache

Retrieve an entry in the cache

Specified by:

get in interface PreparedStatementCache

Specified by:

get in class AbstractPreparedStatementCacheImpl

Parameters:

psw - : parameters of the prepared statement to retrieve

Returns:

wrapped prepared statement or null if not found

put

public void put(PreparedStatementWrapper psw)
         throws CacheException,
                SQLException

Put a pstmt in the cache. If the cache is full, an entry is removed first according to the LRU algorithm

Specified by:

put in interface PreparedStatementCache

Specified by:

put in class AbstractPreparedStatementCacheImpl

Parameters:

psw - prepared statement to add

Throws:

CacheException - no more space in cache

SQLException

getState

public String getState(String prefix)

Description copied from class: AbstractPreparedStatementCacheImpl

Dump the pstmt cache state

Specified by:

getState in interface PreparedStatementCache

Specified by:

getState in class AbstractPreparedStatementCacheImpl

Parameters:

prefix - indentation

Returns:

a string with a cache state (dump)

destroy

public void destroy()

Destroy all the cache entries

Specified by:

destroy in interface PreparedStatementCache

Specified by:

destroy in class AbstractPreparedStatementCacheImpl

reallyClose

public void reallyClose()

Close all the cache entries

Specified by:

reallyClose in interface PreparedStatementCache

Specified by:

reallyClose in class AbstractPreparedStatementCacheImpl

close

public void close()

Close all the cache entries

Specified by:

close in interface PreparedStatementCache

Specified by:

close in class AbstractPreparedStatementCacheImpl