org.apache.naming.resources
Class ResourceCache

java.lang.Object
  org.apache.naming.resources.ResourceCache

public class ResourceCache

extends java.lang.Object

Implements a special purpose cache.

Version:

$Revision: 466608 $

Author:

Remy Maucherat

Field Summary

protected long	accessCount Number of accesses to the cache.
protected CacheEntry[]	cache Cache.
protected int	cacheMaxSize Max size of resources which will have their content cached.
protected int	cacheSize Current cache size in KB.
protected long	desiredEntryAccessRatio Entry hit ratio at which an entry will never be removed from the cache.
protected long	hitsCount Number of cache hits.
protected int	maxAllocateIterations Max amount of removals during a make space.
protected java.util.HashMap	notFoundCache Not found cache.
protected java.util.Random	random Random generator used to determine elements to free.
protected int	spareNotFoundEntries Spare amount of not found entries.

Constructor Summary

ResourceCache()

Method Summary

boolean	allocate(int space)
long	getAccessCount() Return the access count.
int	getCacheMaxSize() Return the maximum size of the cache in KB.
int	getCacheSize() Return the current cache size in KB.
long	getDesiredEntryAccessRatio() Return desired entry access ratio.
long	getHitsCount() Return the number of cache hits.
int	getMaxAllocateIterations() Return the maximum amount of iterations during a space allocation.
int	getSpareNotFoundEntries() Return the amount of spare not found entries.
void	load(CacheEntry entry)
CacheEntry	lookup(java.lang.String name)
void	setCacheMaxSize(int cacheMaxSize) Set the maximum size of the cache in KB.
void	setDesiredEntryAccessRatio(long desiredEntryAccessRatio) Set the desired entry access ratio.
void	setMaxAllocateIterations(int maxAllocateIterations) Set the maximum amount of iterations during a space allocation.
void	setSpareNotFoundEntries(int spareNotFoundEntries) Set the amount of spare not found entries.
boolean	unload(java.lang.String name)

Methods inherited from class java.lang.Object

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

Field Detail

random

protected java.util.Random random

Random generator used to determine elements to free.

cache

protected CacheEntry[] cache

Cache. Path -> Cache entry.

notFoundCache

protected java.util.HashMap notFoundCache

Not found cache.

cacheMaxSize

protected int cacheMaxSize

Max size of resources which will have their content cached.

maxAllocateIterations

protected int maxAllocateIterations

Max amount of removals during a make space.

desiredEntryAccessRatio

protected long desiredEntryAccessRatio

Entry hit ratio at which an entry will never be removed from the cache. Compared with entry.access / hitsCount

spareNotFoundEntries

protected int spareNotFoundEntries

Spare amount of not found entries.

cacheSize

protected int cacheSize

Current cache size in KB.

accessCount

protected long accessCount

Number of accesses to the cache.

hitsCount

protected long hitsCount

Number of cache hits.

Constructor Detail

ResourceCache

public ResourceCache()

Method Detail

getAccessCount

public long getAccessCount()

Return the access count. Note: Update is not synced, so the number may not be completely accurate.

getCacheMaxSize

public int getCacheMaxSize()

Return the maximum size of the cache in KB.

setCacheMaxSize

public void setCacheMaxSize(int cacheMaxSize)

Set the maximum size of the cache in KB.

getCacheSize

public int getCacheSize()

Return the current cache size in KB.

getDesiredEntryAccessRatio

public long getDesiredEntryAccessRatio()

Return desired entry access ratio.

setDesiredEntryAccessRatio

public void setDesiredEntryAccessRatio(long desiredEntryAccessRatio)

Set the desired entry access ratio.

getHitsCount

public long getHitsCount()

Return the number of cache hits. Note: Update is not synced, so the number may not be completely accurate.

getMaxAllocateIterations

public int getMaxAllocateIterations()

Return the maximum amount of iterations during a space allocation.

setMaxAllocateIterations

public void setMaxAllocateIterations(int maxAllocateIterations)

Set the maximum amount of iterations during a space allocation.

getSpareNotFoundEntries

public int getSpareNotFoundEntries()

Return the amount of spare not found entries.

setSpareNotFoundEntries

public void setSpareNotFoundEntries(int spareNotFoundEntries)

Set the amount of spare not found entries.

allocate

public boolean allocate(int space)

lookup

public CacheEntry lookup(java.lang.String name)

load

public void load(CacheEntry entry)

unload

public boolean unload(java.lang.String name)