com.ideaheap.barelyfunctional.functions

Class Memoizer

java.lang.Object

com.ideaheap.barelyfunctional.functions.Memoizer

public class Memoizer
extends Object

Memoization is the act of storing results from previous runs of a function and using these instead. These are often useful when calling long running services that rarely change, and where getting a stale value is not a big deal. They are also useful if a recursive function ends up relatively deep recursion with common sub-paths. These should be used with site-effect free functions! There are no guarantees to the number of times that the target function will be called with the parameters given.

Constructor Summary

Constructors

Constructor and Description
Memoizer(com.google.common.cache.CacheBuilder builder) Constructor to specify custom Guava CacheBuilder.

Method Summary

Modifier and Type	Method and Description
<T,U,R> java.util.function.BiFunction<T,U,R>	memoize(java.util.function.BiFunction<T,U,R> biFunction) Memoize a two parameter function call.
<T,R> java.util.function.Function<T,R>	memoize(java.util.function.Function<T,R> function) Memoize a single function call.

Methods inherited from class java.lang.Object

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

Constructor Detail

Memoizer

public Memoizer(com.google.common.cache.CacheBuilder builder)

Constructor to specify custom Guava CacheBuilder.

Parameters:

builder -

Method Detail

memoize

public <T,R> java.util.function.Function<T,R> memoize(java.util.function.Function<T,R> function)

Memoize a single function call.

Type Parameters:

T -

R -

Parameters:

function - The function to memoize

Returns:

A memoized version of the given function, backed by its own instance of a cache build using the builder specified.

memoize

public <T,U,R> java.util.function.BiFunction<T,U,R> memoize(java.util.function.BiFunction<T,U,R> biFunction)

Memoize a two parameter function call.

Type Parameters:

T -

R -

Parameters:

biFunction - The function to memoize

Returns:

A memoized version of the given function, backed by its own instance of a cache build using the builder specified.