Package noaa.coastwatch.io.tile

Class LRUTileCache

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<K,V>

java.util.LinkedHashMap<TileCacheKey,TilingScheme.Tile>

noaa.coastwatch.io.tile.LRUTileCache

All Implemented Interfaces:

Serializable, Cloneable, Map<TileCacheKey,TilingScheme.Tile>, TileCache

public class LRUTileCache
extends LinkedHashMap<TileCacheKey,TilingScheme.Tile>
implements TileCache

The LRUTileCache is a tile cache that uses a least-recently-used rule to eliminate unused tiles.

Since:

3.3.1

Author:

Peter Hollemans

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K extends Object,V extends Object>, AbstractMap.SimpleImmutableEntry<K extends Object,V extends Object>

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

Map.Entry<K extends Object,V extends Object>

Constructor Summary

Constructors

Constructor	Description
LRUTileCache()	Creates a new empty cache with maximum 16 Mb data.

Method Summary

Modifier and Type	Method	Description
void	clear()
int	getCacheSize()	Gets the total cache size in bytes.
int	getCacheSizeLimit()	Gets the total cache size limit in bytes.
static void	main(String[] argv)	Tests this class.
TilingScheme.Tile	put(TileCacheKey key, TilingScheme.Tile value)
TilingScheme.Tile	remove(Object key)
protected boolean	removeEldestEntry(Map.Entry<TileCacheKey,TilingScheme.Tile> eldest)
void	setCacheSizeLimit(int bytes)	Sets the total cache size limit in bytes.

Methods inherited from class java.util.LinkedHashMap

containsValue, entrySet, forEach, get, getOrDefault, keySet, replaceAll, values

Methods inherited from class java.util.HashMap

clone, compute, computeIfAbsent, computeIfPresent, containsKey, isEmpty, merge, putAll, putIfAbsent, remove, replace, replace, size

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, equals, forEach, get, getOrDefault, hashCode, isEmpty, keySet, merge, putAll, putIfAbsent, remove, replace, replace, replaceAll, size, values

Constructor Details

LRUTileCache

public LRUTileCache()

Creates a new empty cache with maximum 16 Mb data.

Method Details

setCacheSizeLimit

public void setCacheSizeLimit(int bytes)

Description copied from interface: TileCache

Sets the total cache size limit in bytes.

Specified by:

setCacheSizeLimit in interface TileCache

Parameters:

bytes - the number of bytes allowed in the cache. The cache must delete tiles if adding a tile would go over this limit.

getCacheSizeLimit

public int getCacheSizeLimit()

Description copied from interface: TileCache

Gets the total cache size limit in bytes.

Specified by:

getCacheSizeLimit in interface TileCache

Returns:

the number of bytes allowed in the cache. The cache must delete tiles if adding a tile would go over this limit.

getCacheSize

public int getCacheSize()

Description copied from interface: TileCache

Gets the total cache size in bytes.

Specified by:

getCacheSize in interface TileCache

Returns:

the number of bytes currently in the cache.

removeEldestEntry

protected boolean removeEldestEntry(Map.Entry<TileCacheKey,TilingScheme.Tile> eldest)

Overrides:

removeEldestEntry in class LinkedHashMap<TileCacheKey,TilingScheme.Tile>

remove

public TilingScheme.Tile remove(Object key)

Specified by:

remove in interface Map<TileCacheKey,TilingScheme.Tile>

Overrides:

remove in class HashMap<TileCacheKey,TilingScheme.Tile>

put

public TilingScheme.Tile put(TileCacheKey key,
 TilingScheme.Tile value)

Specified by:

put in interface Map<TileCacheKey,TilingScheme.Tile>

Overrides:

put in class HashMap<TileCacheKey,TilingScheme.Tile>

clear

public void clear()

Specified by:

clear in interface Map<TileCacheKey,TilingScheme.Tile>

Overrides:

clear in class LinkedHashMap<TileCacheKey,TilingScheme.Tile>

main

public static void main(String[] argv)
                 throws Exception

Tests this class.

Parameters:

argv - the array of command line parameters.

Throws:

Exception