Package org.codehaus.groovy.runtime.memoize

Class Memoize

java.lang.Object
org.codehaus.groovy.runtime.memoize.Memoize
public abstract class Memoize
extends java.lang.Object
Implements memoize for Closures. It is supposed to be used by the Closure class itself to implement the memoize() family of methods.

  • Constructor Summary

    Constructors
    Constructor Description
    Memoize()  

  • Method Summary

    Modifier and Type Method Description
    static <V> Closure<V> buildMemoizeFunction​(MemoizeCache<java.lang.Object,​java.lang.Object> cache, Closure<V> closure)
    Creates a new closure delegating to the supplied one and memoizing all return values by the arguments.
    static <V> Closure<V> buildSoftReferenceMemoizeFunction​(int protectedCacheSize, MemoizeCache<java.lang.Object,​java.lang.ref.SoftReference<java.lang.Object>> cache, Closure<V> closure)
    Creates a new closure delegating to the supplied one and memoizing all return values by the arguments.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • Memoize

      public Memoize()

  • Method Details

    • buildMemoizeFunction

      public static <V> Closure<V> buildMemoizeFunction​(MemoizeCache<java.lang.Object,​java.lang.Object> cache, Closure<V> closure)
      Creates a new closure delegating to the supplied one and memoizing all return values by the arguments. The supplied cache is used to store the memoized values and it is the cache's responsibility to put limits on the cache size or implement cache eviction strategy. The LRUCache, for example, allows to set the maximum cache size constraint and implements the LRU (Last Recently Used) eviction strategy.
      Type Parameters:
      V - The closure's return type
      Parameters:
      cache - A map to hold memoized return values
      closure - The closure to memoize
      Returns:
      A new memoized closure

    • buildSoftReferenceMemoizeFunction

      public static <V> Closure<V> buildSoftReferenceMemoizeFunction​(int protectedCacheSize, MemoizeCache<java.lang.Object,​java.lang.ref.SoftReference<java.lang.Object>> cache, Closure<V> closure)
      Creates a new closure delegating to the supplied one and memoizing all return values by the arguments. The memoizing closure will use SoftReferences to remember the return values allowing the garbage collector to reclaim the memory, if needed. The supplied cache is used to store the memoized values and it is the cache's responsibility to put limits on the cache size or implement cache eviction strategy. The LRUCache, for example, allows to set the maximum cache size constraint and implements the LRU (Last Recently Used) eviction strategy. If the protectedCacheSize argument is greater than 0 an optional LRU (Last Recently Used) cache of hard references is maintained to protect recently touched memoized values against eviction by the garbage collector.
      Type Parameters:
      V - The closure's return type
      Parameters:
      protectedCacheSize - The number of hard references to keep in order to prevent some (LRU) memoized return values from eviction
      cache - A map to hold memoized return values
      closure - The closure to memoize
      Returns:
      A new memoized closure