oracle.javatools.util

Class Maps.ManagedCacheMap<K,V>

java.lang.Object

oracle.javatools.util.Maps.AbstractHashMap<K,V,E>

oracle.javatools.util.Maps.AbstractLinkedHashMap<K,V,Maps.LinkedEntry<K,V>>

oracle.javatools.util.Maps.CacheMap<K,V>

oracle.javatools.util.Maps.ManagedCacheMap<K,V>

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.util.Map<K,V>, Maps.ManagedCacheMapMBean

Enclosing class:

Maps

public static class Maps.ManagedCacheMap<K,V>
extends Maps.CacheMap<K,V>
implements Maps.ManagedCacheMapMBean

A cache map which is an MBean and can be monitored by a JMX client (e.g., JConsole).

This map will be registered with the MBean server using the following object name, where name is the name given in the constructor:

  "oracle.javatools.cache:type=CacheMap,name=" + name  

Typically, the given name should uniquely identify the instance object which contains and uses the map. If that instance object is a singleton, its class name is typically sufficient; if not, then an additional distinguishing property should be appended. For example, if the containing instances are uniquely characterized by a URL property, then the string passed to the constructor could be:

  getClass().getSimpleName() + ",url=" + getUrl() 

Notice how the URL is appended as an additional property, separated by a comma (",url="). This is not strictly required, but better fits standard JMX object naming conventions. Also note that if the value contains certain characters (for example, a file path if a URL contained a "?" or a file name contained a "\", see ObjectName), it must be quoted using ObjectName.quote(java.lang.String).

See Also:

ObjectName, Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class oracle.javatools.util.Maps.CacheMap

Maps.CacheMap.Canonicity, Maps.CacheMap.Strength

Nested classes/interfaces inherited from interface java.util.Map

java.util.Map.Entry<K,V>

Field Summary

Fields inherited from class oracle.javatools.util.Maps.CacheMap

CANONICAL, HARD, NOT_CANONICAL, SOFT, STRONG, WEAK

Fields inherited from class oracle.javatools.util.Maps.AbstractHashMap

DEFAULT_INITIAL_CAPACITY, DEFAULT_LOAD_FACTOR, MAXIMUM_CAPACITY

Constructor Summary

Constructors

Constructor and Description
ManagedCacheMap(int bound, Maps.CacheMap.Strength strength, java.lang.String name) Constructs a bounded LRU (least recently used) cache map.
ManagedCacheMap(int bound, java.lang.String name) Constructs a bounded LRU (least recently used), canonical, cache map of strongly-referenced values.
ManagedCacheMap(Maps.CacheMap.Strength strength, java.lang.String name) Constructs an unbounded, non-canonical cache map.
ManagedCacheMap(Maps.CacheStrategy<K,V> strategy, java.lang.String name) Constructs a cache map.
ManagedCacheMap(java.lang.String name) Constructs an unbounded, non-canonical cache map of strongly-referenced values.

Method Summary

Modifier and Type	Method and Description
void	clearKeyStatistics()
protected Maps.CacheStrategy<K,V>	decoratedStrategy(Maps.CacheStrategy<K,V> strategy) Invoked by the Maps.CacheMap constructor to allow a subclass to replace the strategy passed to the constructor.
boolean	getCollectKeyStatistics()
javax.management.openmbean.TabularData	getKeyStatistics()
int	getMaximumSize()
int	getSize()
javax.management.openmbean.CompositeData	getStatistics()
int	getTotalKeyCount()
void	setCollectKeyStatistics(boolean collect)

Methods inherited from class oracle.javatools.util.Maps.CacheMap

clear, createEntry, entryAccessed, entryAdded, entryChanged, entryEvicted, entryPurged, entryRemoved, evictEntry, getEldestEntry, mapChanged, removeEldestEntry

Methods inherited from class oracle.javatools.util.Maps.AbstractLinkedHashMap

createEntryIterator, createEntrySetIterator, createKeySetIterator, createValuesIterator, evict, transfer

Methods inherited from class oracle.javatools.util.Maps.AbstractHashMap

addEntry, capacity, change, clone, containsKey, containsValue, entrySet, equals, get, getChangeCount, getEntry, getQueue, hashCode, isEmpty, keyEquals, keyHashCode, keySet, loadFactor, mapConstructed, mapInitialized, purge, purgeEntry, put, putAll, remove, removeExistingEntry, removeKey, size, toString, valueEquals, valueHashCode, values

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Constructor Detail

ManagedCacheMap

public ManagedCacheMap(java.lang.String name)

Constructs an unbounded, non-canonical cache map of strongly-referenced values. The initial capacity and load factor are set to default values.

Parameters:

name - The unique name of this cache (see Maps.ManagedCacheMap).

ManagedCacheMap

public ManagedCacheMap(Maps.CacheMap.Strength strength,
                       java.lang.String name)

Constructs an unbounded, non-canonical cache map. The initial capacity and load factor are set to default values.

Parameters:

strength - The default strength of value references.

name - The unique name of this cache (see Maps.ManagedCacheMap).

ManagedCacheMap

public ManagedCacheMap(int bound,
                       java.lang.String name)

Constructs a bounded LRU (least recently used), canonical, cache map of strongly-referenced values. The initial capacity and load factor are set to default values.

Parameters:

bound - The maximum number of entries allowed in the cache.

name - The unique name of this cache (see Maps.ManagedCacheMap).

ManagedCacheMap

public ManagedCacheMap(int bound,
                       Maps.CacheMap.Strength strength,
                       java.lang.String name)

Constructs a bounded LRU (least recently used) cache map. The initial capacity and load factor are set to default values.

Parameters:

bound - The maximum number of entries allowed in the cache.

strength - The default strength of value references.

name - The unique name of this cache (see Maps.ManagedCacheMap).

ManagedCacheMap

public ManagedCacheMap(Maps.CacheStrategy<K,V> strategy,
                       java.lang.String name)

Constructs a cache map.

Parameters:

strategy - The cache strategy to use.

name - The unique name of this cache (see Maps.ManagedCacheMap).

Method Detail

decoratedStrategy

protected Maps.CacheStrategy<K,V> decoratedStrategy(Maps.CacheStrategy<K,V> strategy)

Description copied from class: Maps.CacheMap

Invoked by the Maps.CacheMap constructor to allow a subclass to replace the strategy passed to the constructor. The default Maps.CacheMap implementation returns the strategy passed to it.

This hook is provided to allow a subclass to decorate a strategy given to its constructor without running afoul of superclass-not- initialized issues.

Overrides:

decoratedStrategy in class Maps.CacheMap<K,V>

Parameters:

strategy - The strategy passed to the CacheMap constructor.

Returns:

the strategy passed to the constructor or a subclass-provided replacement.

getSize

public int getSize()

Specified by:

getSize in interface Maps.ManagedCacheMapMBean

getMaximumSize

public int getMaximumSize()

Specified by:

getMaximumSize in interface Maps.ManagedCacheMapMBean

getStatistics

public javax.management.openmbean.CompositeData getStatistics()
                                                       throws javax.management.openmbean.OpenDataException

Specified by:

getStatistics in interface Maps.ManagedCacheMapMBean

Throws:

javax.management.openmbean.OpenDataException

setCollectKeyStatistics

public void setCollectKeyStatistics(boolean collect)

Specified by:

setCollectKeyStatistics in interface Maps.ManagedCacheMapMBean

getCollectKeyStatistics

public boolean getCollectKeyStatistics()

Specified by:

getCollectKeyStatistics in interface Maps.ManagedCacheMapMBean

getTotalKeyCount

public int getTotalKeyCount()

Specified by:

getTotalKeyCount in interface Maps.ManagedCacheMapMBean

getKeyStatistics

public javax.management.openmbean.TabularData getKeyStatistics()
                                                        throws javax.management.openmbean.OpenDataException

Specified by:

getKeyStatistics in interface Maps.ManagedCacheMapMBean

Throws:

javax.management.openmbean.OpenDataException

clearKeyStatistics

public void clearKeyStatistics()

Specified by:

clearKeyStatistics in interface Maps.ManagedCacheMapMBean