| /* |
| * Copyright 2016-present Open Networking Foundation |
| * |
| * 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.store.service; |
| |
| import com.google.common.collect.Multiset; |
| import com.google.common.util.concurrent.MoreExecutors; |
| |
| import java.util.Collection; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.concurrent.Executor; |
| import java.util.stream.Stream; |
| import java.util.stream.StreamSupport; |
| |
| /** |
| * This provides a synchronous version of the functionality provided by |
| * {@link AsyncConsistentMultimap}. Instead of returning futures this map |
| * blocks until the future completes then returns the result. |
| */ |
| public interface ConsistentMultimap<K, V> extends DistributedPrimitive, Iterable<Map.Entry<K, V>> { |
| /** |
| * Returns the number of key-value pairs in this multimap. |
| * @return the number of key-value pairs |
| */ |
| int size(); |
| |
| /** |
| * Returns if this multimap contains no key-value pairs. |
| * |
| * @return true if no key-value pairs exist, false otherwise |
| */ |
| boolean isEmpty(); |
| |
| /** |
| * Returns true if there is at lease one key-value pair with a key equal to |
| * key. |
| * |
| * @param key the key to query |
| * @return true if the map contains a |
| * key-value pair with key false otherwise |
| */ |
| boolean containsKey(K key); |
| |
| /** |
| * Returns true if this map contains at lease one key-value pair with a |
| * value equal to value. |
| * |
| * @param value the value to query |
| * @return true if there is a key-value pair with the specified value, |
| * false otherwise. |
| */ |
| boolean containsValue(V value); |
| |
| /** |
| * Returns true if this map contains at least one key-value pair with key |
| * and value specified. |
| * |
| * @param key the key to query |
| * @param value the value to query |
| * @return true if there is a key-value pair with the specified key and |
| * value, false otherwise. |
| */ |
| boolean containsEntry(K key, V value); |
| |
| /** |
| * If the key-value pair does not already exist adds either the key value |
| * pair or the value to the set of values associated with the key and |
| * returns true, if the key-value pair already exists then behavior is |
| * implementation specific with some implementations allowing duplicates |
| * and others ignoring put requests for existing entries. |
| * |
| * @param key the key to add |
| * @param value the value to add |
| * @return true if the map has changed because of this call, |
| * false otherwise |
| */ |
| boolean put(K key, V value); |
| |
| /** |
| * If the key-value pair does not already exist adds either the key value |
| * pair or the value to the set of values associated with the key and |
| * returns the updated value, if the key-value pair already exists then behavior |
| * is implementation specific with some implementations allowing duplicates |
| * and others ignoring put requests for existing entries. |
| * |
| * @param key the key to add |
| * @param value the value to add |
| * @return the updated values |
| */ |
| Versioned<Collection<? extends V>> putAndGet(K key, V value); |
| |
| /** |
| * Removes the key-value pair with the specified values if it exists. In |
| * implementations that allow duplicates which matching entry will be |
| * removed is undefined. |
| * |
| * @param key the key of the pair to be removed |
| * @param value the value of the pair to be removed |
| * @return true if the map changed because of this call, false otherwise. |
| */ |
| boolean remove(K key, V value); |
| |
| /** |
| * Removes the key-value pair with the specified values if it exists. In |
| * implementations that allow duplicates which matching entry will be |
| * removed is undefined. |
| * |
| * @param key the key of the pair to be removed |
| * @param value the value of the pair to be removed |
| * @return the updated values |
| */ |
| Versioned<Collection<? extends V>> removeAndGet(K key, V value); |
| |
| /** |
| * Removes the key-value pairs with the specified key and values if they |
| * exist. In implementations that allow duplicates each instance of a key |
| * will remove one matching entry, which one is not defined. Equivalent to |
| * repeated calls to {@code remove()} for each key value pair but more |
| * efficient. |
| * |
| * @param key the key of the pair to be removed |
| * @param values the set of values to be removed |
| * @return true if the map changes because of this call, false otherwise. |
| */ |
| boolean removeAll(K key, Collection<? extends V> values); |
| |
| /** |
| * Removes all values associated with the specified key as well as the key |
| * itself. |
| * |
| * @param key the key whose key-value pairs will be removed |
| * @return the set of values that were removed, which may be empty, if the |
| * values did not exist the version will be less than one. |
| */ |
| Versioned<Collection<? extends V>> removeAll(K key); |
| |
| /** |
| * Removes the set of key-value pairs with the specified key and values if they |
| * exist. In implementations that allow duplicates each instance of a key |
| * will remove one matching entry, which one is not defined. Equivalent to |
| * repeated calls to {@code remove()} for each key value pair but more |
| * efficient. |
| * |
| * @param mapping the keys-values to be removed |
| * @return true if the map changes because of this call, false otherwise. |
| */ |
| boolean removeAll(Map<K, Collection<? extends V>> mapping); |
| |
| /** |
| * Adds the set of key-value pairs of the specified key with each of the |
| * values in the iterable if each key-value pair does not already exist, |
| * if the pair does exist the behavior is implementation specific. |
| * (Same as repeated puts but with efficiency gains.) |
| * |
| * @param key the key to use for all pairs to be added |
| * @param values the set of values to be added in pairs with the key |
| * @return true if any change in the map results from this call, |
| * false otherwise |
| */ |
| boolean putAll(K key, Collection<? extends V> values); |
| |
| /** |
| * Adds the set of key-value pairs of the specified mapping with each of |
| * the values in the iterable if each key-value pair does not already exist, |
| * if the pair does exist the behavior is implementation specific. |
| * (Same as repeated puts but with efficiency gains.) |
| * |
| * @param mapping the keys-values to be added |
| * @return true if any change in the map results from this call, |
| * false otherwise |
| */ |
| boolean putAll(Map<K, Collection<? extends V>> mapping); |
| |
| /** |
| * Stores all the values in values associated with the key specified, |
| * removes all preexisting values and returns a collection of the removed |
| * values which may be empty if the entry did not exist. |
| * |
| * @param key the key for all entries to be added |
| * @param values the values to be associated with the key |
| * @return the collection of removed values, which may be empty |
| */ |
| Versioned<Collection<? extends V>> replaceValues(K key, |
| Collection<V> values); |
| |
| /** |
| * Removes all key-value pairs, after which it will be empty. |
| */ |
| void clear(); |
| |
| /** |
| * Returns a collection of values associated with the specified key, if the |
| * key is not in the map it will return an empty collection. |
| * |
| * @param key the key whose associated values will be returned |
| * @return the collection of the values |
| * associated with the specified key, the collection may be empty |
| */ |
| Versioned<Collection<? extends V>> get(K key); |
| |
| /** |
| * Returns a set of the keys contained in this multimap with one or more |
| * associated values. |
| * |
| * @return the collection of all keys with one or more associated values, |
| * this may be empty |
| */ |
| Set<K> keySet(); |
| |
| /** |
| * Returns a multiset of the keys present in this multimap with one or more |
| * associated values each. Keys will appear once for each key-value pair |
| * in which they participate. |
| * |
| * @return a multiset of the keys, this may be empty |
| */ |
| Multiset<K> keys(); |
| |
| /** |
| * Returns a collection of values in the set with duplicates permitted, the |
| * size of this collection will equal the size of the map at the time of |
| * creation. |
| * |
| * @return a collection of values, this may be empty |
| */ |
| Multiset<V> values(); |
| |
| /** |
| * Returns a collection of each key-value pair in this map. |
| * <p> |
| * Do not use this method to read large maps. Use an {@link #iterator()} or {@link #stream()} instead. |
| * |
| * @return a collection of all entries in the map, this may be empty |
| */ |
| Collection<Map.Entry<K, V>> entries(); |
| |
| /** |
| * Streams entries from the map. |
| * <p> |
| * This method is optimized for large maps. |
| * |
| * @return the map entry stream |
| */ |
| default Stream<Map.Entry<K, V>> stream() { |
| return StreamSupport.stream(spliterator(), false); |
| } |
| |
| /** |
| * Returns a map of keys to collections of values that reflect the set of |
| * key-value pairs contained in the multimap, where the key value pairs |
| * would be the key paired with each of the values in the collection. |
| * |
| * @return a map of keys to collections of values, the returned map may be |
| * empty. |
| */ |
| Map<K, Collection<V>> asMap(); |
| |
| /** |
| * Registers the specified listener to be notified whenever the map is updated. |
| * |
| * @param listener listener to notify about map events |
| */ |
| default void addListener(MultimapEventListener<K, V> listener) { |
| addListener(listener, MoreExecutors.directExecutor()); |
| } |
| |
| /** |
| * Registers the specified listener to be notified whenever the map is updated. |
| * |
| * @param listener listener to notify about map events |
| * @param executor executor to use for handling incoming map events |
| */ |
| void addListener(MultimapEventListener<K, V> listener, Executor executor); |
| |
| /** |
| * Unregisters the specified listener such that it will no longer |
| * receive map change notifications. |
| * |
| * @param listener listener to unregister |
| */ |
| void removeListener(MultimapEventListener<K, V> listener); |
| } |