org.eclipse.persistence.internal.cache

Class Memoizer<A,V>

java.lang.Object

org.eclipse.persistence.internal.cache.Memoizer<A,V>

All Implemented Interfaces:

LowLevelProcessor<A,V>

public class Memoizer<A,V>
extends java.lang.Object
implements LowLevelProcessor<A,V>

Memoizer for computing resource expensive tasks asynchronously & concurrently. Inspired by D. Lea. JCiP, 2nd edition. Addison-Wesley, 2006. pp.109

Author:

Marcel Valovy

Constructor Summary

Constructors

Constructor and Description
Memoizer()

Method Summary

Modifier and Type	Method and Description
V	compute(ComputableTask<A,V> c, A taskArg) Waits if necessary for the computation to complete, and then retrieves its result.
void	forget(ComputableTask<A,V> task, A key) Forgets result of the specified task.
void	forgetAll() Forgets all cached results.

Methods inherited from class java.lang.Object

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

Constructor Detail

Memoizer

public Memoizer()

Method Detail

compute

public V compute(ComputableTask<A,V> c,
                 A taskArg)
          throws java.lang.InterruptedException

Description copied from interface: LowLevelProcessor

Waits if necessary for the computation to complete, and then retrieves its result.

Specified by:

compute in interface LowLevelProcessor<A,V>

taskArg - argument for computation

Throws:

java.lang.InterruptedException - if the current thread was interrupted while waiting

forget

public void forget(ComputableTask<A,V> task,
                   A key)

Forgets result of the specified task. This allows to manually control size of internal cache.

Parameters:

task - computable task, forming part of result key

key - argument of computation

forgetAll

public void forgetAll()

Forgets all cached results.