org.cactoos.func

Class StickyFunc<X,Y>

java.lang.Object

org.cactoos.func.StickyFunc<X,Y>

Type Parameters:

X - Type of input

Y - Type of output

All Implemented Interfaces:

Func<X,Y>

public final class StickyFunc<X,Y>
extends Object
implements Func<X,Y>

Func that caches previously calculated values and doesn't recalculate again.

This Func decorator technically is an in-memory cache.

Pay attention that this class is not thread-safe. It is highly recommended to always decorate it with SyncFunc.

There is no thread-safety guarantee.

Since:

0.1

See Also:

StickyScalar

Nested Class Summary

Nested classes/interfaces inherited from interface org.cactoos.Func

Func.NoNulls<X,Y>

Constructor Summary

Constructors

Constructor and Description
StickyFunc(Func<X,Y> fnc) Ctor.
StickyFunc(Func<X,Y> fnc, int max) Ctor.

Method Summary

Modifier and Type	Method and Description
Y	apply(X input) Apply it.

Methods inherited from class java.lang.Object

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

Constructor Detail

StickyFunc

public StickyFunc(Func<X,Y> fnc)

Ctor.

Parameters:

fnc - Func original

StickyFunc

public StickyFunc(Func<X,Y> fnc,
                  int max)

Ctor.

Parameters:

fnc - Func original

max - Maximum cache size

Since:

0.26

Method Detail

apply

public Y apply(X input)
        throws Exception

Description copied from interface: Func

Apply it.

Specified by:

apply in interface Func<X,Y>

Parameters:

input - The argument

Returns:

The result

Throws:

Exception - If fails