memoization-guava/src/main/java/de/xn__ho_hia/memoization/guava/AbstractGuavaCacheBasedMemoizer.java

   1 /*
   2  * This file is part of memoization.java. It is subject to the license terms in the LICENSE file found in the top-level
   3  * directory of this distribution and at http://creativecommons.org/publicdomain/zero/1.0/. No part of memoization.java,
   4  * including this file, may be copied, modified, propagated, or distributed except according to the terms contained
   5  * in the LICENSE file.
   6  */
   7 package de.xn__ho_hia.memoization.guava;
   8
   9 import java.util.concurrent.ExecutionException;
  10 import java.util.function.Function;
  11
  12 import com.google.common.cache.Cache;
  13
  14 import de.xn__ho_hia.memoization.shared.MemoizationException;
  15
  16 abstract class AbstractGuavaCacheBasedMemoizer<KEY, VALUE> {
  17
  18     private final Cache<KEY, VALUE> cache;
  19
  20     protected AbstractGuavaCacheBasedMemoizer(final Cache<KEY, VALUE> cache) {
  21         this.cache = cache;
  22     }
  23
  24     protected final VALUE get(final KEY key, final Function<KEY, VALUE> function) {
  25         try {
  26             return cache.get(key, () -> function.apply(key));
  27         } catch (final ExecutionException exception) {
  28             throw new MemoizationException(exception);
  29         }
  30     }
  31
  32 }