Memoizer (EclipseLink Core 3.0.3-RC1 API)

java.lang.Object
- org.eclipse.persistence.internal.cache.Memoizer<A,V>

All Implemented Interfaces:

LowLevelProcessor<A,V>
```
public class Memoizer<A,V>
extends 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

Since:

2.6

Author:

Marcel Valovy - [email protected]

Constructor Summary

Constructors
Constructor Description

Memoizer()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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
clone, equals, finalize, 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 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:
    
    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.