com.informix.jdbc

Class PreparedStatementCache

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<K,V>

java.util.LinkedHashMap<java.lang.String,IfxPreparedStatement>

com.informix.jdbc.PreparedStatementCache

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.util.Map<java.lang.String,IfxPreparedStatement>

public class PreparedStatementCache
extends java.util.LinkedHashMap<java.lang.String,IfxPreparedStatement>

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

java.util.AbstractMap.SimpleEntry<K,V>, java.util.AbstractMap.SimpleImmutableEntry<K,V>

Field Summary

Fields

Modifier and Type	Field and Description
protected int	initialMaximumEntries
protected long	maximumDelay
protected long	minimumDelay
protected int	zeroPointPercentage

Constructor Summary

Constructors

Constructor and Description
PreparedStatementCache(IfxSqliConnect connection, int maximumEntries) Creates a new LRU map based on a LinkedHashMap that supports an upper-limit on the number of entries.

Method Summary

Methods

Modifier and Type	Method and Description
void	clear()
static double	computeUsedHeapPercentage()
boolean	equals(java.lang.Object o)
static java.util.List<org.bson.BSONObject>	getCacheInfo()
int	getMaximumEntries() Returns the maximum number of entries allowed in this LRU map.
static DelayedWeakReference<PreparedStatementCache>[]	getPreparedStatementCaches()
static com.informix.jdbc.PreparedStatementCache.PreparedStatementCleanupThread	getPreparedStatementCleanupThread()
int	hashCode()
protected boolean	removeEldestEntry(java.util.Map.Entry<java.lang.String,IfxPreparedStatement> eldest) Returns true if the maximum number of entries has been exceeded in the map and therefore the eldest entry needs to be removed.
void	setMaximumEntries(int maximumEntries)
static void	startCache()
static void	stopCache()

Methods inherited from class java.util.LinkedHashMap

containsValue, get

Methods inherited from class java.util.HashMap

clone, containsKey, entrySet, isEmpty, keySet, put, putAll, remove, size, values

Methods inherited from class java.util.AbstractMap

toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

containsKey, entrySet, isEmpty, keySet, put, putAll, remove, size, values

Field Detail

initialMaximumEntries

protected final int initialMaximumEntries

zeroPointPercentage

protected final int zeroPointPercentage

minimumDelay

protected final long minimumDelay

maximumDelay

protected final long maximumDelay

Constructor Detail

PreparedStatementCache

public PreparedStatementCache(IfxSqliConnect connection,
                      int maximumEntries)

Creates a new LRU map based on a LinkedHashMap that supports an upper-limit on the number of entries. The eldest (oldest) entry in the map will be removed when the maximum number of entries allowed is exceeded.

Parameters:

maximumKEntries - the maximum number of entries to allow in the LRU map

Method Detail

getPreparedStatementCleanupThread

public static com.informix.jdbc.PreparedStatementCache.PreparedStatementCleanupThread getPreparedStatementCleanupThread()

startCache

public static void startCache()

stopCache

public static void stopCache()

getCacheInfo

public static java.util.List<org.bson.BSONObject> getCacheInfo()

getPreparedStatementCaches

public static DelayedWeakReference<PreparedStatementCache>[] getPreparedStatementCaches()

computeUsedHeapPercentage

public static double computeUsedHeapPercentage()

getMaximumEntries

public int getMaximumEntries()

Returns the maximum number of entries allowed in this LRU map.

Returns:

the maximum number of entries allowed in this LRU map.

setMaximumEntries

public void setMaximumEntries(int maximumEntries)

removeEldestEntry

protected boolean removeEldestEntry(java.util.Map.Entry<java.lang.String,IfxPreparedStatement> eldest)

Returns true if the maximum number of entries has been exceeded in the map and therefore the eldest entry needs to be removed.

Overrides:

removeEldestEntry in class java.util.LinkedHashMap<java.lang.String,IfxPreparedStatement>

clear

public void clear()

Specified by:

clear in interface java.util.Map<java.lang.String,IfxPreparedStatement>

Overrides:

clear in class java.util.LinkedHashMap<java.lang.String,IfxPreparedStatement>

equals

public boolean equals(java.lang.Object o)

Specified by:

equals in interface java.util.Map<java.lang.String,IfxPreparedStatement>

Overrides:

equals in class java.util.AbstractMap<java.lang.String,IfxPreparedStatement>

hashCode

public int hashCode()

Specified by:

hashCode in interface java.util.Map<java.lang.String,IfxPreparedStatement>

Overrides:

hashCode in class java.util.AbstractMap<java.lang.String,IfxPreparedStatement>