Source code

001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.io.storage.ram;
020
021import org.apache.reef.io.ExternalMap;
022import org.apache.reef.io.storage.util.GetAllIterable;
023
024import javax.inject.Inject;
025import java.util.Map;
026import java.util.Map.Entry;
027import java.util.Set;
028import java.util.concurrent.ConcurrentSkipListMap;
029
030/**
031 * Simple in-memory ExternalMap implementation.  This class does not require
032 * any codecs, and so is guaranteed to be instantiable.  Therefore, it is the
033 * default ExternalMap provided by StorageManagerRam.
034 */
035public class RamMap<T> implements ExternalMap<T> {
036  private final ConcurrentSkipListMap<CharSequence, T> map
037      = new ConcurrentSkipListMap<CharSequence, T>();
038
039  @Inject
040  public RamMap(RamStorageService ramStore) {
041    //this.localStore = localStore;
042  }
043
044  @Override
045  public boolean containsKey(CharSequence key) {
046    return map.containsKey(key);
047  }
048
049  @Override
050  public T get(CharSequence key) {
051    return map.get(key);
052  }
053
054  @Override
055  public T put(CharSequence key, T value) {
056    return map.put(key, value);
057  }
058
059  @Override
060  public T remove(CharSequence key) {
061    return map.remove(key);
062  }
063
064  @Override
065  public void putAll(Map<? extends CharSequence, ? extends T> m) {
066    map.putAll(m);
067  }
068
069  @Override
070  public Iterable<Entry<CharSequence, T>> getAll(Set<? extends CharSequence> keys) {
071    return new GetAllIterable<>(keys, this);
072  }
073
074}