com.blazegraph.gremlin.util

Class Memoizer<V>

java.lang.Object

com.blazegraph.gremlin.util.Memoizer<V>

public class Memoizer<V>
extends Object

Safe lazy-initialization pattern for Java 8.

Author:

mikepersonick

Constructor Summary

Constructors

Constructor and Description
Memoizer(Callable<V> compute) Lazy initializer.
Memoizer(Callable<V> compute, V val) Eager initializer.

Method Summary

Modifier and Type	Method and Description
V	clear() Clear the cache, return the old value (or null if it had not been computed yet).
V	get() Get the cached value (compute if necessary).

Methods inherited from class java.lang.Object

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

Constructor Detail

Memoizer

public Memoizer(Callable<V> compute)

Lazy initializer.

Parameters:

compute - Callable to compute the value to cache.

Memoizer

public Memoizer(Callable<V> compute,
                V val)

Eager initializer.

Parameters:

compute - Callable to compute the value to cache.

val - Pre-computed value to cache (if non-null).

Method Detail

get

public V get()

Get the cached value (compute if necessary).

Returns:

the cached value

clear

public V clear()

Clear the cache, return the old value (or null if it had not been computed yet).

Returns:

the previously cached value