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org.jdbf.engine.caching
Class CacheManager  

java.lang.Object
  org.jdbf.engine.caching.CacheManager

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public class CacheManager

extends java.lang.Object

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Field Summary
private static java.util.Hashtable	cache           This is the HashMap that contains all objects in the cache.
private static int	cacheSize           This is the max capacity of the cache.
private static int	deletedCount           This is the count of objects deleted from the cache
private static int	getCount           This is the number of objects read from the cache.
private static int	maxUsage           This is the max usage of the cache
private static int	putCount           This is the number of objects put in the cache
private static int	sumDeleted           This is the sum of the frequency of the objects deleted from the cache
private static int	sumUsage           This is the sum of the usage of the cache
private static int	zeroDeleted           This is the number of objects deleted from the cache, with frequency 0

 

Constructor Summary

CacheManager()

 

Method Summary
static java.util.Hashtable	getCache()           Returns a Hashtable with the contents of the cache.
static Cacheable	getCache(java.lang.Object identifier)           Gets an object from the cache.
private static Cacheable	getLFU()           Looks for the Least Frequently Used object and returns its reference.
static void	putCache(Cacheable object)           Adds a new Object to the cache.
static boolean	setSize(int newSize)           Sets the size of the cache.
static void	showStats()           Shows some statistics about the usage of the cache

 

Methods inherited from class java.lang.Object

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

 

Field Detail

cache

private static java.util.Hashtable cache

This is the HashMap that contains all objects in the cache.

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cacheSize

private static int cacheSize

This is the max capacity of the cache. If the number object stored in the cache is greater than this, one object will be replaced using LFU (Least Frequently Used) algorithm.

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putCount

private static int putCount

This is the number of objects put in the cache

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getCount

private static int getCount

This is the number of objects read from the cache.

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zeroDeleted

private static int zeroDeleted

This is the number of objects deleted from the cache, with frequency 0

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deletedCount

private static int deletedCount

This is the count of objects deleted from the cache

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sumDeleted

private static int sumDeleted

This is the sum of the frequency of the objects deleted from the cache

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maxUsage

private static int maxUsage

This is the max usage of the cache

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sumUsage

private static int sumUsage

This is the sum of the usage of the cache

Constructor Detail

CacheManager

public CacheManager()

Method Detail

getLFU

private static Cacheable getLFU()

Looks for the Least Frequently Used object and returns its reference. Every time an object is read from the cache, it's frequency is incremented. When a new object is going to be added to a full cache, LFU algorithm deletes the object with least frequency in the cache. If more than one object have the same frequency, and this is the least frequency found, LFU algorithm deletes the oldest object.

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putCache

public static void putCache(Cacheable object)

Adds a new Object to the cache. If the object was previously in the cache, the newer object replaces the older one.

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getCache

public static Cacheable getCache(java.lang.Object identifier)

Gets an object from the cache.

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getCache

public static java.util.Hashtable getCache()

Returns a Hashtable with the contents of the cache.

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setSize

public static boolean setSize(int newSize)

Sets the size of the cache. If the cache contains more objects than the new size lets it, some objects are removed using LFU algorithm.

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showStats

public static void showStats()

Shows some statistics about the usage of the cache

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> jdbf >> engine >> [ caching overview ]	PREV CLASS  NEXT CLASS
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