io.atomix.primitives.map.ConsistentMultimap Maven / Gradle / Ivy
/*
* 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 io.atomix.primitives.map;
import com.google.common.collect.Multiset;
import com.google.common.util.concurrent.MoreExecutors;
import io.atomix.primitives.DistributedPrimitive;
import io.atomix.time.Versioned;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.Executor;
/**
* 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 extends DistributedPrimitive {
/**
* 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);
/**
* 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 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 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> removeAll(K key);
/**
* 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 values);
/**
* 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> replaceValues(K key,
Collection 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> 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 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 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 values();
/**
* Returns a collection of each key-value pair in this map.
*
* @return a collection of all entries in the map, this may be empty
*/
Collection> entries();
/**
* 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> 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 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 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 listener);
}
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