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 java.lang.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

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.Map<java.lang.ClassLoader,java.util.Map<java.lang.String,java.lang.ref.WeakReference<T>>>	cache The cache

Constructor Summary

Constructors

Constructor and Description
WeakClassCache()

Method Summary

Modifier and Type	Method and Description
protected abstract void	generate(java.lang.Class<?> clazz, T result) Fill in the result
T	get(java.lang.Class<?> clazz) Get the information for a class
T	get(java.lang.String name, java.lang.ClassLoader cl) Get the information for a class
protected java.util.Map<java.lang.String,java.lang.ref.WeakReference<T>>	getClassLoaderCache(java.lang.ClassLoader cl) Get the cache for the classloader
protected abstract T	instantiate(java.lang.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 java.util.Map<java.lang.ClassLoader,java.util.Map<java.lang.String,java.lang.ref.WeakReference<T>>> cache

The cache

Constructor Detail

WeakClassCache

public WeakClassCache()

Method Detail

get

public T get(java.lang.Class<?> clazz)

Get the information for a class

Parameters:

clazz - the class

Returns:

the info

get

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

Get the information for a class

Parameters:

name - the name

cl - the classloader

Returns:

the info

Throws:

java.lang.ClassNotFoundException - when the class cannot be found

instantiate

protected abstract T instantiate(java.lang.Class<?> clazz)

Instantiate for a class

Parameters:

clazz - the class

Returns:

the result

generate

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

Fill in the result

Parameters:

clazz - the class

result - the result

getClassLoaderCache

protected java.util.Map<java.lang.String,java.lang.ref.WeakReference<T>> getClassLoaderCache(java.lang.ClassLoader cl)

Get the cache for the classloader

Parameters:

cl - the classloader

Returns:

the map