Aaron Kruglikov | 92511f2 | 2015-10-12 14:39:04 -0700 | [diff] [blame] | 1 | /* |
Brian O'Connor | 5ab426f | 2016-04-09 01:19:45 -0700 | [diff] [blame] | 2 | * Copyright 2015-present Open Networking Laboratory |
Aaron Kruglikov | 92511f2 | 2015-10-12 14:39:04 -0700 | [diff] [blame] | 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.onosproject.persistence.impl; |
| 18 | |
| 19 | import com.google.common.collect.Iterators; |
| 20 | import org.mapdb.DB; |
| 21 | import org.mapdb.Hasher; |
| 22 | import org.mapdb.Serializer; |
| 23 | |
| 24 | import java.util.Collection; |
| 25 | import java.util.Iterator; |
| 26 | import java.util.Set; |
| 27 | |
| 28 | import static com.google.common.base.Preconditions.checkNotNull; |
| 29 | |
| 30 | /** |
| 31 | * A set implementation that gets and receives all data from a serialized internal set. |
| 32 | */ |
| 33 | //TODO add locking for reads and writes |
| 34 | public class PersistentSet<E> implements Set<E> { |
| 35 | |
| 36 | private final org.onosproject.store.service.Serializer serializer; |
| 37 | |
| 38 | private final org.mapdb.DB database; |
| 39 | |
| 40 | private final Set<byte[]> items; |
| 41 | |
| 42 | private final String name; |
| 43 | |
| 44 | public PersistentSet(org.onosproject.store.service.Serializer serializer, DB database, String name) { |
| 45 | this.serializer = checkNotNull(serializer); |
| 46 | this.database = checkNotNull(database); |
| 47 | this.name = checkNotNull(name); |
| 48 | |
| 49 | items = database |
| 50 | .createHashSet(name) |
| 51 | .serializer(Serializer.BYTE_ARRAY) |
| 52 | .hasher(Hasher.BYTE_ARRAY) |
| 53 | .makeOrGet(); |
| 54 | } |
| 55 | |
| 56 | public void readInto(Set<E> items) { |
| 57 | this.items.forEach(item -> items.add(serializer.decode(item))); |
| 58 | } |
| 59 | |
| 60 | @Override |
| 61 | public int size() { |
| 62 | return items.size(); |
| 63 | } |
| 64 | |
| 65 | @Override |
| 66 | public boolean isEmpty() { |
| 67 | return items.isEmpty(); |
| 68 | } |
| 69 | |
| 70 | @Override |
| 71 | public boolean contains(Object o) { |
| 72 | checkNotNull(o, "The argument cannot be null"); |
| 73 | return items.contains(serializer.encode(o)); |
| 74 | } |
| 75 | |
| 76 | @Override |
| 77 | public Iterator<E> iterator() { |
| 78 | return Iterators.transform(items.iterator(), serializer::decode); |
| 79 | } |
| 80 | |
| 81 | @Override |
| 82 | public Object[] toArray() { |
| 83 | Object[] retArray = new Object[items.size()]; |
| 84 | int index = 0; |
Sho SHIMIZU | 1578042 | 2016-08-12 15:59:20 -0700 | [diff] [blame] | 85 | for (byte[] item : items) { |
| 86 | retArray[index] = serializer.decode(item); |
Aaron Kruglikov | 92511f2 | 2015-10-12 14:39:04 -0700 | [diff] [blame] | 87 | index++; |
| 88 | } |
| 89 | return retArray; |
| 90 | } |
| 91 | |
| 92 | @Override |
| 93 | public <T> T[] toArray(T[] a) { |
| 94 | checkNotNull(a, "The passed in array cannot be null."); |
| 95 | int index = 0; |
| 96 | Iterator<byte[]> iterator = items.iterator(); |
| 97 | T[] retArray; |
| 98 | if (a.length >= items.size()) { |
| 99 | retArray = a; |
| 100 | } else { |
| 101 | retArray = (T[]) new Object[items.size()]; |
| 102 | } |
| 103 | while (iterator.hasNext()) { |
| 104 | retArray[index++] = serializer.decode(iterator.next()); |
| 105 | } |
| 106 | if (retArray.length > items.size()) { |
| 107 | retArray[index] = null; |
| 108 | } |
| 109 | return retArray; |
| 110 | } |
| 111 | |
| 112 | @Override |
| 113 | public boolean add(E item) { |
Shashikanth VH | 1f1c6ee | 2016-04-27 20:05:07 +0530 | [diff] [blame] | 114 | checkNotNull(item, "Item to be added cannot be null."); |
Aaron Kruglikov | 92511f2 | 2015-10-12 14:39:04 -0700 | [diff] [blame] | 115 | return items.add(serializer.encode(item)); |
| 116 | } |
| 117 | |
| 118 | @Override |
| 119 | public boolean remove(Object o) { |
| 120 | checkNotNull(o, "Item to be removed cannot be null."); |
| 121 | return items.remove(serializer.encode(o)); |
| 122 | } |
| 123 | |
| 124 | @Override |
| 125 | public boolean containsAll(Collection<?> c) { |
| 126 | checkNotNull(c, "Collection cannot be internal."); |
| 127 | for (Object item : c) { |
| 128 | if (!items.contains(serializer.encode(item))) { |
| 129 | return false; |
| 130 | } |
| 131 | } |
| 132 | return true; |
| 133 | } |
| 134 | |
| 135 | @Override |
| 136 | public boolean addAll(Collection<? extends E> c) { |
| 137 | checkNotNull(c, "The collection to be added cannot be null."); |
| 138 | boolean changed = false; |
| 139 | for (Object item : c) { |
| 140 | changed = items.add(serializer.encode(item)) || changed; |
| 141 | } |
| 142 | return changed; |
| 143 | } |
| 144 | |
| 145 | @Override |
| 146 | public boolean retainAll(Collection<?> c) { |
| 147 | boolean changed = false; |
| 148 | for (byte[] item : items) { |
| 149 | E deserialized = serializer.decode(item); |
| 150 | if (!c.contains(deserialized)) { |
| 151 | changed = items.remove(item) || changed; |
| 152 | } |
| 153 | } |
| 154 | return changed; |
| 155 | } |
| 156 | |
| 157 | @Override |
| 158 | public boolean removeAll(Collection<?> c) { |
| 159 | boolean changed = false; |
| 160 | for (Object item : c) { |
| 161 | changed = items.remove(serializer.encode(item)) || changed; |
| 162 | } |
| 163 | return changed; |
| 164 | } |
| 165 | |
| 166 | @Override |
| 167 | public void clear() { |
| 168 | items.clear(); |
| 169 | } |
| 170 | |
| 171 | @Override |
| 172 | public boolean equals(Object set) { |
| 173 | //This is not threadsafe and on larger sets incurs a significant processing cost |
| 174 | if (!(set instanceof Set)) { |
| 175 | return false; |
| 176 | } |
| 177 | Set asSet = (Set) set; |
| 178 | if (asSet.size() != this.size()) { |
| 179 | return false; |
| 180 | } |
| 181 | for (Object item : this) { |
| 182 | if (!asSet.contains(item)) { |
| 183 | return false; |
| 184 | } |
| 185 | } |
| 186 | return true; |
| 187 | } |
| 188 | |
| 189 | @Override |
| 190 | public int hashCode() { |
| 191 | return super.hashCode(); |
| 192 | } |
Sho SHIMIZU | 1578042 | 2016-08-12 15:59:20 -0700 | [diff] [blame] | 193 | } |