Jordan Halterman | 948d659 | 2017-04-20 17:18:24 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2017-present Open Networking Laboratory |
| 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.store.primitives.impl; |
| 18 | |
Jordan Halterman | 948d659 | 2017-04-20 17:18:24 -0700 | [diff] [blame] | 19 | import java.util.List; |
| 20 | import java.util.Map; |
| 21 | import java.util.Set; |
| 22 | import java.util.concurrent.CompletableFuture; |
| 23 | import java.util.concurrent.ExecutionException; |
| 24 | import java.util.concurrent.TimeUnit; |
| 25 | import java.util.concurrent.TimeoutException; |
| 26 | import java.util.stream.Collectors; |
| 27 | import java.util.stream.Stream; |
| 28 | |
| 29 | import com.google.common.base.MoreObjects; |
| 30 | import com.google.common.base.Objects; |
| 31 | import com.google.common.base.Throwables; |
| 32 | import com.google.common.collect.Maps; |
| 33 | import com.google.common.collect.Sets; |
| 34 | import org.onosproject.store.primitives.MapUpdate; |
| 35 | import org.onosproject.store.service.ConsistentMap; |
| 36 | import org.onosproject.store.service.DistributedPrimitive; |
| 37 | import org.onosproject.store.service.TransactionException; |
| 38 | import org.onosproject.store.service.TransactionalMap; |
| 39 | import org.onosproject.store.service.Version; |
| 40 | |
| 41 | import static com.google.common.base.Preconditions.checkNotNull; |
| 42 | import static com.google.common.base.Preconditions.checkState; |
| 43 | |
| 44 | /** |
| 45 | * Base class for participants within a single {@link TransactionalMap}. |
| 46 | * <p> |
| 47 | * This class provides the basic functionality required by transactional map participants and provides methods |
| 48 | * for defining operations specific to individual isolation levels. |
| 49 | * |
| 50 | * @param <K> key type |
| 51 | * @param <V> value type. |
| 52 | */ |
| 53 | public abstract class TransactionalMapParticipant<K, V> implements TransactionalMap<K, V>, TransactionParticipant { |
| 54 | private static final String TX_CLOSED_ERROR = "Transaction is closed"; |
| 55 | private static final String ERROR_NULL_VALUE = "Null values are not allowed"; |
| 56 | private static final String ERROR_NULL_KEY = "Null key is not allowed"; |
| 57 | |
| 58 | protected final ConsistentMap<K, V> backingMap; |
| 59 | protected final Transaction<MapUpdate<K, V>> transaction; |
| 60 | protected final Map<K, V> writeCache = Maps.newConcurrentMap(); |
| 61 | protected final Set<K> deleteSet = Sets.newConcurrentHashSet(); |
Jordan Halterman | 948d659 | 2017-04-20 17:18:24 -0700 | [diff] [blame] | 62 | protected volatile Version lock; |
| 63 | |
| 64 | protected TransactionalMapParticipant( |
| 65 | ConsistentMap<K, V> backingMap, |
| 66 | Transaction<MapUpdate<K, V>> transaction) { |
| 67 | this.backingMap = backingMap; |
| 68 | this.transaction = transaction; |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * Starts the transaction for this partition when a read occurs. |
| 73 | * <p> |
| 74 | * Acquiring a pessimistic lock at the start of the transaction ensures that underlying cached maps have been |
| 75 | * synchronized prior to a read. |
| 76 | */ |
| 77 | private void beginTransaction() { |
Jordan Halterman | 5f97a30 | 2017-04-26 23:41:31 -0700 | [diff] [blame] | 78 | if (lock == null) { |
| 79 | synchronized (this) { |
| 80 | if (lock == null) { |
| 81 | try { |
| 82 | lock = transaction.begin() |
Jordan Halterman | 6440b09 | 2017-05-24 17:48:08 -0700 | [diff] [blame^] | 83 | .get(DistributedPrimitive.DEFAULT_OPERATION_TIMEOUT_MILLIS, TimeUnit.MILLISECONDS); |
Jordan Halterman | 5f97a30 | 2017-04-26 23:41:31 -0700 | [diff] [blame] | 84 | } catch (InterruptedException e) { |
| 85 | Thread.currentThread().interrupt(); |
| 86 | throw new TransactionException.Interrupted(); |
| 87 | } catch (TimeoutException e) { |
| 88 | throw new TransactionException.Timeout(); |
| 89 | } catch (ExecutionException e) { |
| 90 | Throwables.propagateIfPossible(e.getCause()); |
| 91 | throw new TransactionException(e.getCause()); |
| 92 | } |
| 93 | } |
Jordan Halterman | 948d659 | 2017-04-20 17:18:24 -0700 | [diff] [blame] | 94 | } |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | @Override |
| 99 | public V get(K key) { |
| 100 | // Start the transaction for this primitive/partition if necessary. |
| 101 | beginTransaction(); |
| 102 | |
| 103 | checkState(transaction.isOpen(), TX_CLOSED_ERROR); |
| 104 | checkNotNull(key, ERROR_NULL_KEY); |
| 105 | |
| 106 | if (deleteSet.contains(key)) { |
| 107 | return null; |
| 108 | } |
| 109 | |
| 110 | V latest = writeCache.get(key); |
| 111 | if (latest != null) { |
| 112 | return latest; |
| 113 | } else { |
| 114 | return read(key); |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Executes a get operation based on the transaction isolation level. |
| 120 | * |
| 121 | * @param key the key to look up |
| 122 | * @return the value |
| 123 | */ |
| 124 | protected abstract V read(K key); |
| 125 | |
| 126 | @Override |
| 127 | public boolean containsKey(K key) { |
| 128 | return get(key) != null; |
| 129 | } |
| 130 | |
| 131 | @Override |
| 132 | public V put(K key, V value) { |
| 133 | checkNotNull(value, ERROR_NULL_VALUE); |
| 134 | |
| 135 | V latest = get(key); |
| 136 | writeCache.put(key, value); |
| 137 | deleteSet.remove(key); |
| 138 | return latest; |
| 139 | } |
| 140 | |
| 141 | @Override |
| 142 | public V remove(K key) { |
| 143 | V latest = get(key); |
| 144 | if (latest != null) { |
| 145 | writeCache.remove(key); |
| 146 | deleteSet.add(key); |
| 147 | } |
| 148 | return latest; |
| 149 | } |
| 150 | |
| 151 | @Override |
| 152 | public boolean remove(K key, V value) { |
| 153 | checkNotNull(value, ERROR_NULL_VALUE); |
| 154 | |
| 155 | V latest = get(key); |
| 156 | if (Objects.equal(value, latest)) { |
| 157 | remove(key); |
| 158 | return true; |
| 159 | } |
| 160 | return false; |
| 161 | } |
| 162 | |
| 163 | @Override |
| 164 | public boolean replace(K key, V oldValue, V newValue) { |
| 165 | checkNotNull(oldValue, ERROR_NULL_VALUE); |
| 166 | checkNotNull(newValue, ERROR_NULL_VALUE); |
| 167 | |
| 168 | V latest = get(key); |
| 169 | if (Objects.equal(oldValue, latest)) { |
| 170 | put(key, newValue); |
| 171 | return true; |
| 172 | } |
| 173 | return false; |
| 174 | } |
| 175 | |
| 176 | @Override |
| 177 | public V putIfAbsent(K key, V value) { |
| 178 | checkNotNull(value, ERROR_NULL_VALUE); |
| 179 | |
| 180 | V latest = get(key); |
| 181 | if (latest == null) { |
| 182 | put(key, value); |
| 183 | } |
| 184 | return latest; |
| 185 | } |
| 186 | |
| 187 | @Override |
Jordan Halterman | 948d659 | 2017-04-20 17:18:24 -0700 | [diff] [blame] | 188 | public CompletableFuture<Boolean> prepare() { |
Jordan Halterman | 5f97a30 | 2017-04-26 23:41:31 -0700 | [diff] [blame] | 189 | return transaction.prepare(log(lock)); |
Jordan Halterman | 948d659 | 2017-04-20 17:18:24 -0700 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | @Override |
| 193 | public CompletableFuture<Void> commit() { |
| 194 | return transaction.commit(); |
| 195 | } |
| 196 | |
| 197 | @Override |
| 198 | public CompletableFuture<Boolean> prepareAndCommit() { |
Jordan Halterman | 5f97a30 | 2017-04-26 23:41:31 -0700 | [diff] [blame] | 199 | return transaction.prepareAndCommit(log(lock)); |
Jordan Halterman | 948d659 | 2017-04-20 17:18:24 -0700 | [diff] [blame] | 200 | } |
| 201 | |
| 202 | @Override |
| 203 | public CompletableFuture<Void> rollback() { |
| 204 | return transaction.rollback(); |
| 205 | } |
| 206 | |
| 207 | /** |
| 208 | * Returns a list of updates performed within this map partition. |
| 209 | * |
Jordan Halterman | 5f97a30 | 2017-04-26 23:41:31 -0700 | [diff] [blame] | 210 | * @param lockVersion the global transaction lock version |
Jordan Halterman | 948d659 | 2017-04-20 17:18:24 -0700 | [diff] [blame] | 211 | * @return a list of map updates |
| 212 | */ |
Jordan Halterman | 5f97a30 | 2017-04-26 23:41:31 -0700 | [diff] [blame] | 213 | protected List<MapUpdate<K, V>> log(Version lockVersion) { |
| 214 | return records(lockVersion).collect(Collectors.toList()); |
Jordan Halterman | 948d659 | 2017-04-20 17:18:24 -0700 | [diff] [blame] | 215 | } |
| 216 | |
| 217 | /** |
| 218 | * Returns a stream of updates performed within this map partition. |
| 219 | * |
Jordan Halterman | 5f97a30 | 2017-04-26 23:41:31 -0700 | [diff] [blame] | 220 | * @param lockVersion the global transaction lock version |
Jordan Halterman | 948d659 | 2017-04-20 17:18:24 -0700 | [diff] [blame] | 221 | * @return a stream of map updates |
| 222 | */ |
Jordan Halterman | 5f97a30 | 2017-04-26 23:41:31 -0700 | [diff] [blame] | 223 | protected abstract Stream<MapUpdate<K, V>> records(Version lockVersion); |
Jordan Halterman | 948d659 | 2017-04-20 17:18:24 -0700 | [diff] [blame] | 224 | |
| 225 | @Override |
| 226 | public String toString() { |
| 227 | return MoreObjects.toStringHelper(this) |
| 228 | .add("backingMap", backingMap) |
Jordan Halterman | 948d659 | 2017-04-20 17:18:24 -0700 | [diff] [blame] | 229 | .toString(); |
| 230 | } |
| 231 | } |