content: /*
   * 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.alibaba.jstorm.cache.memory;
  
  import com.alibaba.jstorm.cache.IKvStore;
  import com.google.common.collect.Maps;
  
  import java.io.IOException;
  import java.util.Collection;
  import java.util.Map;
  
  public class InMemoryKvStore<K, V> implements IKvStore<K, V> {
      private Map<K, V> kvStore = Maps.newHashMap();
  
      public InMemoryKvStore() {
      }
  
      @Override
      public V get(K key) throws IOException {
          return kvStore.get(key);
      }
  
      @Override
      public Map<K, V> getBatch(Collection<K> keys) throws IOException {
          Map<K, V> batch = Maps.<K, V>newHashMap();
          for (K key : keys) {
              batch.put(key, kvStore.get(key));
          }
          return batch;
      }
  
      @Override
      public void put(K key, V value) throws IOException {
          kvStore.put(key, value);
      }
  
      @Override
      public void putBatch(Map<K, V> batch) throws IOException {
          kvStore.putAll(batch);
      }
  
      @Override
      public void remove(K key) throws IOException {
          kvStore.remove(key);
      }
  
      @Override
      public void removeBatch(Collection<K> keys) throws IOException {
          for (K key : keys) {
              kvStore.remove(key);
          }
      }
  
      @Override
      public Collection<K> listKeys() throws IOException {
          return kvStore.keySet();
      }
  
      @Override
      public void close() throws IOException {
          kvStore.clear();
      }
  }