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.serialization.Codec; 023import org.apache.reef.io.storage.util.GetAllIterable; 024import org.apache.reef.tang.annotations.Name; 025import org.apache.reef.tang.annotations.NamedParameter; 026import org.apache.reef.tang.annotations.Parameter; 027 028import javax.inject.Inject; 029import java.util.Map; 030import java.util.Map.Entry; 031import java.util.Set; 032import java.util.concurrent.ConcurrentSkipListMap; 033 034public class CodecRamMap<T> implements ExternalMap<T> { 035 036 private final Codec<T> c; 037 private final ConcurrentSkipListMap<CharSequence, byte[]> map; 038 039 @Inject 040 public CodecRamMap(final RamStorageService ramStore, 041 @Parameter(RamMapCodec.class) final Codec<T> c) { 042 this.c = c; 043 this.map = new ConcurrentSkipListMap<CharSequence, byte[]>(); 044 } 045 046 @Override 047 public boolean containsKey(final CharSequence key) { 048 return map.containsKey(key); 049 } 050 051 @Override 052 public T get(final CharSequence key) { 053 final byte[] ret = map.get(key); 054 return ret != null ? c.decode(ret) : null; 055 } 056 057 @Override 058 public T put(final CharSequence key, final T value) { 059 final byte[] ret = map.put(key, c.encode(value)); 060 return ret != null ? c.decode(ret) : null; 061 } 062 063 @Override 064 public T remove(final CharSequence key) { 065 final byte[] ret = map.remove(key); 066 return ret != null ? c.decode(ret) : null; 067 } 068 069 @Override 070 public void putAll(final Map<? extends CharSequence, ? extends T> m) { 071 for (final Entry<? extends CharSequence, ? extends T> entry : m.entrySet()) { 072 map.put(entry.getKey(), c.encode(entry.getValue())); 073 } 074 } 075 076 @Override 077 public Iterable<Map.Entry<CharSequence, T>> getAll( 078 final Set<? extends CharSequence> keys) { 079 return new GetAllIterable<>(keys, this); 080 } 081 082 @NamedParameter 083 public static class RamMapCodec implements Name<Codec<?>> { 084 } 085}