org.jboss.util.collection
Class WeakClassCache<T>

java.lang.Object
  org.jboss.util.collection.WeakClassCache<T>

Type Parameters:

T - exact value type

public abstract class WeakClassCache<T>
extends Object

A weak class cache that instantiates does not a hold a strong reference to either the classloader or class.

It creates the class specific data in two stages to avoid recursion.

instantiate - creates the data
generate - fills in the details

Author:

Adrian Brock, Ales Justin

Field Summary

protected Map<ClassLoader,Map<String,WeakReference<T>>>

cache The cache

Constructor Summary

WeakClassCache()

Method Summary

protected abstract void	generate(Class<?> clazz, T result) Fill in the result
T	get(Class<?> clazz) Get the information for a class
T	get(String name, ClassLoader cl) Get the information for a class
protected Map<String,WeakReference<T>>	getClassLoaderCache(ClassLoader cl) Get the cache for the classloader
protected abstract T	instantiate(Class<?> clazz) Instantiate for a class

Methods inherited from class java.lang.Object

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

Field Detail

cache

protected final Map<ClassLoader,Map<String,WeakReference<T>>> cache

The cache

Constructor Detail

WeakClassCache

public WeakClassCache()

Method Detail

get

public T get(Class<?> clazz)

Get the information for a class

Parameters:

clazz - the class

Returns:

the info

get

public T get(String name,
             ClassLoader cl)
      throws ClassNotFoundException

Get the information for a class

Parameters:

name - the name

cl - the classloader

Returns:

the info

Throws:

ClassNotFoundException - when the class cannot be found

instantiate

protected abstract T instantiate(Class<?> clazz)

Instantiate for a class

Parameters:

clazz - the class

Returns:

the result

generate

protected abstract void generate(Class<?> clazz,
                                 T result)

Fill in the result

Parameters:

clazz - the class

result - the result

getClassLoaderCache

protected Map<String,WeakReference<T>> getClassLoaderCache(ClassLoader cl)

Get the cache for the classloader

Parameters:

cl - the classloader

Returns:

the map