| /* |
| * Copyright 2015-present Open Networking Laboratory |
| * |
| * 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 org.onosproject.persistence.impl; |
| |
| import com.google.common.collect.Maps; |
| import com.google.common.collect.Sets; |
| import org.mapdb.DB; |
| import org.mapdb.Hasher; |
| import org.onosproject.store.service.Serializer; |
| |
| import java.util.Collection; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| |
| /** |
| * A map implementation that stores and receives all data from a serialized internal map. |
| */ |
| public class PersistentMap<K, V> implements Map<K, V> { |
| |
| private final Serializer serializer; |
| |
| private final org.mapdb.DB database; |
| |
| private final Map<byte[], byte[]> items; |
| |
| private final String name; |
| |
| public PersistentMap(Serializer serializer, DB database, String name) { |
| this.serializer = checkNotNull(serializer); |
| this.database = checkNotNull(database); |
| this.name = checkNotNull(name); |
| |
| items = database |
| .createHashMap(name) |
| .keySerializer(org.mapdb.Serializer.BYTE_ARRAY) |
| .valueSerializer(org.mapdb.Serializer.BYTE_ARRAY) |
| .hasher(Hasher.BYTE_ARRAY) |
| .makeOrGet(); |
| } |
| |
| /** |
| * Reads this set in deserialized form into the provided map. |
| * |
| * @param items the map to be populated |
| */ |
| public void readInto(Map<K, V> items) { |
| this.items.forEach((keyBytes, valueBytes) -> |
| items.put(serializer.decode(keyBytes), |
| serializer.decode(valueBytes))); |
| } |
| |
| @Override |
| public V remove(Object key) { |
| checkNotNull(key, "Key can not be null."); |
| V removed = get(key); |
| items.remove(serializer.encode(key)); |
| return removed; |
| } |
| |
| @Override |
| public int size() { |
| return items.size(); |
| } |
| |
| @Override |
| public boolean isEmpty() { |
| return items.isEmpty(); |
| } |
| |
| @Override |
| public boolean containsKey(Object key) { |
| checkNotNull(key, "Key cannot be null."); |
| return items.containsKey(serializer.encode(key)); |
| } |
| |
| @Override |
| public boolean containsValue(Object value) { |
| checkNotNull(value, "Value cannot be null."); |
| byte[] serialized = serializer.encode(value); |
| for (byte[] compareValue : items.values()) { |
| boolean same = true; |
| if (compareValue == null) { |
| same = false; |
| } else if (compareValue.length != serialized.length) { |
| same = false; |
| } else { |
| for (int i = 0; i < serialized.length; i++) { |
| if (serialized[i] != compareValue[i]) { |
| same = false; |
| break; |
| } |
| } |
| } |
| if (same) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public V get(Object key) { |
| checkNotNull(key, "Key cannot be null."); |
| return serializer.decode(items.get(serializer.encode(key))); |
| } |
| |
| @Override |
| public V put(K key, V value) { |
| checkNotNull(key, "Key cannot be null."); |
| checkNotNull(value, "Value cannot be null."); |
| byte[] prevVal = items.put(serializer.encode(key), serializer.encode(value)); |
| if (prevVal == null) { |
| return null; |
| } |
| return serializer.decode(prevVal); |
| } |
| |
| @Override |
| public void putAll(Map<? extends K, ? extends V> m) { |
| checkNotNull(m, "The passed in map cannot be null."); |
| m.forEach((k, v) -> items.put(serializer.encode(k), serializer.encode(v))); |
| } |
| |
| @Override |
| public void clear() { |
| items.clear(); |
| } |
| |
| @Override |
| public Set<K> keySet() { |
| Set<K> keys = Sets.newHashSet(); |
| items.keySet().forEach(k -> keys.add(serializer.decode(k))); |
| return keys; |
| } |
| |
| @Override |
| public Collection<V> values() { |
| Collection<V> values = Sets.newHashSet(); |
| items.values().forEach(v -> values.add(serializer.decode(v))); |
| return values; |
| } |
| |
| @Override |
| public Set<Entry<K, V>> entrySet() { |
| Set<Entry<K, V>> entries = Sets.newHashSet(); |
| items.entrySet(). |
| forEach(e -> entries.add(Maps.immutableEntry(serializer.decode(e.getKey()), |
| serializer.decode(e.getValue())))); |
| return entries; |
| } |
| |
| @Override |
| public boolean equals(Object map) { |
| //This is not threadsafe and on larger maps incurs a significant processing cost |
| if (!(map instanceof Map)) { |
| return false; |
| } |
| Map asMap = (Map) map; |
| if (this.size() != asMap.size()) { |
| return false; |
| } |
| for (Entry entry : this.entrySet()) { |
| Object key = entry.getKey(); |
| if (!asMap.containsKey(key) || !asMap.get(key).equals(entry.getValue())) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| @Override |
| public int hashCode() { |
| return super.hashCode(); |
| } |
| } |