de.odysseus.el.tree.impl

Class Cache

java.lang.Object

de.odysseus.el.tree.impl.Cache

All Implemented Interfaces:

TreeCache

public final class Cache
extends java.lang.Object
implements TreeCache

Simple (thread-safe) LRU cache. After the cache size reached a certain limit, the least recently used entry is removed, when adding a new entry.

Author:

Christoph Beck

Constructor Summary

Constructors

Constructor and Description
Cache(int size) Constructor.
Cache(int size, java.util.Map<java.lang.String,Tree> secondary) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
Tree	get(java.lang.String expression) Lookup tree
void	put(java.lang.String expression, Tree tree) Cache tree

Methods inherited from class java.lang.Object

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

Constructor Detail

Cache

public Cache(int size)

Constructor. Use a WeakHashMap as secondary map.

Parameters:

size - maximum primary cache size

Cache

public Cache(int size,
     java.util.Map<java.lang.String,Tree> secondary)

Constructor. If the least recently used entry is removed from the primary cache, it is added to the secondary map.

Parameters:

size - maximum primary cache size

secondary - the secondary map (may be null)

Method Detail

get

public Tree get(java.lang.String expression)

Description copied from interface: TreeCache

Lookup tree

Specified by:

get in interface TreeCache

put

public void put(java.lang.String expression,
       Tree tree)

Description copied from interface: TreeCache

Cache tree

Specified by:

put in interface TreeCache