Modifier and Type	Class and Description
private class	Memoizer.KeyStorage Composite-key map.
private class	Memoizer.MemoizerKey Key for composite-key map.

Modifier and Type	Field and Description
private final ConcurrentMap<Memoizer<A, V>.MemoizerKey, Future<V>>	cache
private final Memoizer<A, V>.KeyStorage	keyStorage

Access	Constructor and Description
public	Memoizer()

Modifier and Type	Method and Description
public V	compute(final ComputableTask<A, V> c, final A argument for computation taskArg) Implements org.eclipse.persistence.internal.cache.LowLevelProcessor.compute. Waits if necessary for the computation to complete, and then retrieves its result.
public void	forget(ComputableTask<A, V> computable task, forming part of result key task, A argument of computation key) Forgets result of the specified task.
public void	forgetAll() Forgets all cached results.

cache	back to summary
private final ConcurrentMap<Memoizer<A, V>.MemoizerKey, Future<V>> cache

keyStorage	back to summary
private final Memoizer<A, V>.KeyStorage keyStorage

Memoizer	back to summary
public Memoizer()

compute	back to summary
public V compute(final ComputableTask<A, V> c, final A taskArg) throws InterruptedException Implements org.eclipse.persistence.internal.cache.LowLevelProcessor.compute. Doc from org.eclipse.persistence.internal.cache.LowLevelProcessor.compute. Waits if necessary for the computation to complete, and then retrieves its result. Parameters taskArg:A argument for computation Annotations @Override Exceptions InterruptedException: if the current thread was interrupted while waiting

forget	back to summary
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:ComputableTask<A, V> computable task, forming part of result key key:A argument of computation

forgetAll	back to summary
public void forgetAll() Forgets all cached results.

Modifier and Type	Field and Description
pack-priv Map<Memoizer<A, V>.MemoizerKey, Memoizer<A, V>.MemoizerKey>	map

Access	Constructor and Description
private	KeyStorage()

Modifier and Type	Method and Description
public Memoizer<A, V>.MemoizerKey	get(final ComputableTask<A, V> c, final A taskArg)

map	back to summary
pack-priv Map<Memoizer<A, V>.MemoizerKey, Memoizer<A, V>.MemoizerKey> map

KeyStorage	back to summary
private KeyStorage()

get	back to summary
public Memoizer<A, V>.MemoizerKey get(final ComputableTask<A, V> c, final A taskArg)

org.eclipse.persistence.internal.cache back to summary

private Class Memoizer.MemoizerKey

Class Inheritance

extends Object

java.lang.Object
org.eclipse.persistence.internal.cache.Memoizer.MemoizerKey

Key for composite-key map.

Field Summary

Modifier and Type	Field and Description
private final A	key
private final ComputableTask<A, V>	task

Constructor Summary

Access	Constructor and Description
private	MemoizerKey(ComputableTask<A, V> task, A key)

Method Summary

Modifier and Type	Method and Description
public boolean	equals(Object the reference object with which to compare. o) Overrides java.lang.Object.equals. Indicates whether some other object is "equal to" this one.
public int	hashCode() Overrides java.lang.Object.hashCode. Returns a hash code value for the object.

Inherited from java.lang.Object:: clone finalize getClass notify notifyAll toString wait wait wait

Field Detail

key	back to summary
private final A key

task	back to summary
private final ComputableTask<A, V> task

Constructor Detail

MemoizerKey	back to summary
private MemoizerKey(ComputableTask<A, V> task, A key)

Method Detail

equals back to summary

equals	back to summary
public boolean equals(Object o) Overrides java.lang.Object.equals. Doc from java.lang.Object.equals. Indicates whether some other object is "equal to" this one. The `equals` method implements an equivalence relation on non-null object references: It is reflexive: for any non-null reference value `x`, `x.equals(x)` should return `true`. It is symmetric: for any non-null reference values `x` and `y`, `x.equals(y)` should return `true` if and only if `y.equals(x)` returns `true`. It is transitive: for any non-null reference values `x`, `y`, and `z`, if `x.equals(y)` returns `true` and `y.equals(z)` returns `true`, then `x.equals(z)` should return `true`. It is consistent: for any non-null reference values `x` and `y`, multiple invocations of `x.equals(y)` consistently return `true` or consistently return `false`, provided no information used in `equals` comparisons on the objects is modified. For any non-null reference value `x`, `x.equals(null)` should return `false`. An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes. Parameters o:Object the reference object with which to compare. Returns:boolean `true` if this object is the same as the obj argument; `false` otherwise. Annotations @Override

public boolean equals(Object o)

Overrides java.lang.Object.equals.

Doc from java.lang.Object.equals.

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

It is reflexive: for any non-null reference value x, x.equals(x) should return true.
It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
For any non-null reference value x, x.equals(null) should return false.

An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes.

Parameters

o:Object: the reference object with which to compare.

Returns:boolean

true if this object is the same as the obj argument; false otherwise.

Annotations

@Override

hashCode back to summary

hashCode	back to summary
public int hashCode() Overrides java.lang.Object.hashCode. Doc from java.lang.Object.hashCode. Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by `java.util.HashMap`. The general contract of `hashCode` is: Whenever it is invoked on the same object more than once during an execution of a Java application, the `hashCode` method must consistently return the same integer, provided no information used in `equals` comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application. If two objects are equal according to the `equals` method, then calling the `hashCode` method on each of the two objects must produce the same integer result. It is not required that if two objects are unequal according to the `equals` method, then calling the `hashCode` method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables. Returns:int a hash code value for this object. Annotations @Override

public int hashCode()

Overrides java.lang.Object.hashCode.

Doc from java.lang.Object.hashCode.

Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by java.util.HashMap.

The general contract of hashCode is:

Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
If two objects are equal according to the equals method, then calling the hashCode method on each of the two objects must produce the same integer result.
It is not required that if two objects are unequal according to the equals method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

Returns:int

a hash code value for this object.

Annotations

@Override

public Class Memoizer<A, V>

Nested and Inner Type Summary

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail

private Class Memoizer.KeyStorage

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail

private Class Memoizer.MemoizerKey

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail