org.deegree_impl.tools
Class Cache_Impl

java.lang.Object
  java.util.TimerTask
      org.deegree_impl.tools.Cache_Impl

All Implemented Interfaces:

Cache, java.lang.Runnable

Direct Known Subclasses:

WMSCache

public class Cache_Impl

extends java.util.TimerTask

implements Cache

This class provides a cache for feature collections created by the wms filter services.

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Author:

Andreas Poth

Field Summary

protected java.util.Map	data
protected java.util.Map	lastCallTime
private int	maxCacheSize
private int	maxLifeTime
private int	updateInterval

Fields inherited from class java.util.TimerTask

Constructor Summary

Cache_Impl()

Cache_Impl(int maxEntries)

Cache_Impl(int maxEntries, int maxLifeTime)

Method Summary

void	clear() removes all entries from the cache
protected java.lang.Object	deleteOldest() removes the feature collection from the cache that hasn't been called for the longest time.
java.lang.Object	get(java.lang.Object identifier) gets an entry from the cache.
int	getCurrentSize() returns the actual amount of entries within the cache
int	getMaxEntries() returns the number of entries maximal allowed within the cache
int	getMaxLifeTime() returns the maximal time a feature collection is stored within the cache without being called
int	getUpdateInterval() returns the time interval the internal thread is looking for feature collection that exeeds the max life time
void	push(java.lang.Object identifier, java.lang.Object data) pushes a new entry to the cache.
java.lang.Object	remove(java.lang.Object identifier) removes an entry from the cache.
void	run()
void	setMaxEntries(int maxCacheSize) sets the maximal number of objects that will be stored within the cache.
void	setMaxLifeTime(int maxLifeTime) sets the maximal time a feature collection is stored within the cache without being called
void	setUpdateInterval(int updateInterval) sets the time interval the internal thread is looking for feature collection that exeeds the max life time
java.lang.String	toString()

Methods inherited from class java.util.TimerTask

cancel, scheduledExecutionTime

Methods inherited from class java.lang.Object

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

Field Detail

data

protected java.util.Map data

lastCallTime

protected java.util.Map lastCallTime

maxLifeTime

private int maxLifeTime

updateInterval

private int updateInterval

maxCacheSize

private int maxCacheSize

Constructor Detail

Cache_Impl

public Cache_Impl()

Cache_Impl

public Cache_Impl(int maxEntries)

Cache_Impl

public Cache_Impl(int maxEntries,
                  int maxLifeTime)

Method Detail

get

public java.lang.Object get(java.lang.Object identifier)

gets an entry from the cache. The entry that shall be returned will be identified by the submitted identifier. If no entry for a submitted identifier can be found within the cache the method shall return null.

Specified by:

get in interface Cache

push

public void push(java.lang.Object identifier,
                 java.lang.Object data)

pushes a new entry to the cache. Each entry is marked by an unique identifier

Specified by:

push in interface Cache

deleteOldest

protected java.lang.Object deleteOldest()

removes the feature collection from the cache that hasn't been called for the longest time.

getCurrentSize

public int getCurrentSize()

returns the actual amount of entries within the cache

Specified by:

getCurrentSize in interface Cache

getMaxLifeTime

public int getMaxLifeTime()

returns the maximal time a feature collection is stored within the cache without being called

Specified by:

getMaxLifeTime in interface Cache

setMaxLifeTime

public void setMaxLifeTime(int maxLifeTime)

sets the maximal time a feature collection is stored within the cache without being called

Specified by:

setMaxLifeTime in interface Cache

getUpdateInterval

public int getUpdateInterval()

returns the time interval the internal thread is looking for feature collection that exeeds the max life time

setUpdateInterval

public void setUpdateInterval(int updateInterval)

sets the time interval the internal thread is looking for feature collection that exeeds the max life time

getMaxEntries

public int getMaxEntries()

returns the number of entries maximal allowed within the cache

Specified by:

getMaxEntries in interface Cache

setMaxEntries

public void setMaxEntries(int maxCacheSize)

sets the maximal number of objects that will be stored within the cache. Is the cache if completly filled and a new object shall be added the object that hasn't been called for the longest time will be removed.

Specified by:

setMaxEntries in interface Cache

clear

public void clear()

removes all entries from the cache

Specified by:

clear in interface Cache

remove

public java.lang.Object remove(java.lang.Object identifier)

removes an entry from the cache. The entry that shall be removed will be identified by the submitted identifier. The removed entry will be returned. If no entry for a submitted identifier can be found within the cache the method shall return null.

Specified by:

remove in interface Cache

toString

public java.lang.String toString()

run

public void run()

Specified by:

run in interface java.lang.Runnable