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A set of utilities and tools to speed up and ease programming in Java.

There is a newer version: 0.5

/*
 * (c) 2005 David B. Bracewell
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package com.davidbracewell.cache;


import com.google.common.base.Throwables;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import lombok.NonNull;

import java.io.Serializable;
import java.util.concurrent.ExecutionException;

/**
 * Wraps a Guava Cache
 *
 * @param  the type parameter
 * @param  the type parameter
 * @author David B. Bracewell
 */
class GuavaCache implements com.davidbracewell.cache.Cache, Serializable {

  private static final long serialVersionUID = 1L;
  private final Cache cache;
  private final String name;

  /**
   * Default Constructor
   *
   * @param specification The cache specification
   */
  GuavaCache(@NonNull String name, @NonNull CacheBuilder specification) {
    this.name = name;
    this.cache = specification.build();
  }

  @Override
  public V putIfAbsent(K key, final V value) {
    try {
      return cache.get(key, () -> value);
    } catch (ExecutionException e) {
      throw Throwables.propagate(e);
    }
  }

  @Override
  public void clear() {
    cache.invalidateAll();
  }

  @Override
  public boolean containsKey(K key) {
    return cache.asMap().containsKey(key);
  }

  @Override
  public V get(K key) {
    return cache.getIfPresent(key);
  }

  @Override
  public String getName() {
    return name;
  }

  @Override
  public void put(K key, final V value) {
    cache.put(key, value);
  }

  @Override
  public long size() {
    return cache.size();
  }

  @Override
  public void invalidateAll(Iterable keys) {
    cache.invalidateAll(keys);
  }

  @Override
  public void invalidate(K key) {
    cache.invalidate(key);
  }


}//END OF GuavaCache