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()
java.lang.Object	clone()
static double	computeUsedHeapPercentage()
boolean	containsKey(java.lang.Object key)
boolean	containsValue(java.lang.Object value)
java.util.Set<java.util.Map.Entry<java.lang.String,IfxPreparedStatement>>	entrySet()
boolean	equals(java.lang.Object o)
IfxPreparedStatement	get(java.lang.Object key)
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()
int	hashCode()
boolean	isEmpty()
java.util.Set<java.lang.String>	keySet()
IfxPreparedStatement	put(java.lang.String key, IfxPreparedStatement value)
void	putAll(java.util.Map<? extends java.lang.String,? extends IfxPreparedStatement> m)
IfxPreparedStatement	remove(java.lang.Object id)
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)
int	size()
java.util.Collection<IfxPreparedStatement>	values()

Methods inherited from class java.util.AbstractMap

toString

Methods inherited from class java.lang.Object

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

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

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)

get

public IfxPreparedStatement get(java.lang.Object key)

Specified by:

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

Overrides:

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

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>

remove

public IfxPreparedStatement remove(java.lang.Object id)

Specified by:

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

Overrides:

remove in class java.util.HashMap<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>

containsValue

public boolean containsValue(java.lang.Object value)

Specified by:

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

Overrides:

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

size

public int size()

Specified by:

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

Overrides:

size in class java.util.HashMap<java.lang.String,IfxPreparedStatement>

isEmpty

public boolean isEmpty()

Specified by:

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

Overrides:

isEmpty in class java.util.HashMap<java.lang.String,IfxPreparedStatement>

containsKey

public boolean containsKey(java.lang.Object key)

Specified by:

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

Overrides:

containsKey in class java.util.HashMap<java.lang.String,IfxPreparedStatement>

put

public IfxPreparedStatement put(java.lang.String key,
                       IfxPreparedStatement value)

Specified by:

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

Overrides:

put in class java.util.HashMap<java.lang.String,IfxPreparedStatement>

putAll

public void putAll(java.util.Map<? extends java.lang.String,? extends IfxPreparedStatement> m)

Specified by:

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

Overrides:

putAll in class java.util.HashMap<java.lang.String,IfxPreparedStatement>

clone

public java.lang.Object clone()

Overrides:

clone in class java.util.HashMap<java.lang.String,IfxPreparedStatement>

keySet

public java.util.Set<java.lang.String> keySet()

Specified by:

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

Overrides:

keySet in class java.util.HashMap<java.lang.String,IfxPreparedStatement>

values

public java.util.Collection<IfxPreparedStatement> values()

Specified by:

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

Overrides:

values in class java.util.HashMap<java.lang.String,IfxPreparedStatement>

entrySet

public java.util.Set<java.util.Map.Entry<java.lang.String,IfxPreparedStatement>> entrySet()

Specified by:

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

Overrides:

entrySet in class java.util.HashMap<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>