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/*
* Copyright 2015 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();
}
}
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