com.microsoft.reef.io.storage.ram.CodecRamMap Maven / Gradle / Ivy

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/**
 * Copyright (C) 2013 Microsoft Corporation
 *
 * Licensed 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.microsoft.reef.io.storage.ram;

import com.microsoft.reef.io.ExternalMap;
import com.microsoft.reef.io.serialization.Codec;
import com.microsoft.reef.io.storage.util.GetAllIterable;
import com.microsoft.tang.annotations.Name;
import com.microsoft.tang.annotations.NamedParameter;
import com.microsoft.tang.annotations.Parameter;

import javax.inject.Inject;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentSkipListMap;

/**
 * 
 * @author Rusty Sears 
 */
public class CodecRamMap implements ExternalMap {

  private final Codec c;
  private final ConcurrentSkipListMap map;

  @NamedParameter
  static public class RamMapCodec implements Name> {
  }

  @Inject
  public CodecRamMap(RamStorageService ramStore,
      @Parameter(RamMapCodec.class) final Codec c) {
    this.c = c;
    this.map = new ConcurrentSkipListMap();
  }

  @Override
  public boolean containsKey(final CharSequence key) {
    return map.containsKey(key);
  }

  @Override
  public T get(final CharSequence key) {
    final byte[] ret = map.get(key);
    return ret != null ? c.decode(ret) : null;
  }

  @Override
  public T put(final CharSequence key, T value) {
    final byte[] ret = map.put(key, c.encode(value));
    return ret != null ? c.decode(ret) : null;
  }

  @Override
  public T remove(final CharSequence key) {
    final byte[] ret = map.remove(key);
    return ret != null ? c.decode(ret) : null;
  }

  @Override
  public void putAll(final Map m) {
    for (final CharSequence x : m.keySet()) {
      map.put(x, c.encode(m.get(x)));
    }
  }

  @Override
  public Iterable> getAll(
    final Set keys) {
    return new GetAllIterable(keys, this);
  }
}