package com.atlassian.asap.core.server.jersey;
   
   import java.util.Map;
   import java.util.concurrent.ConcurrentHashMap;
   import java.util.function.Function;
   
   /**
    * Memoizes the result of a function.
    */
  final class Memoizer<T, U> {
  
      private final Map<T, U> cache = new ConcurrentHashMap<>();
  
      private Memoizer() {
      }
  
      private Function<T, U> doMemoize(final Function<T, U> function) {
          return input -> cache.computeIfAbsent(input, function);
      }
  
      static <T, U> Function<T, U> memoize(final Function<T, U> function) {
          return new Memoizer<T, U>().doMemoize(function);
      }
  }