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/**
* Copyright (c) 2013-2021 Nikita Koksharov
*
* 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.redisson.api;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
/**
* Base Multimap interface. Allows to map multiple values per key.
*
* @author Nikita Koksharov
*
* @param key
* @param value
*/
public interface RMultimap extends RExpirable, RMultimapAsync {
/**
* Returns RCountDownLatch instance associated with key
*
* @param key - map key
* @return countdownlatch
*/
RCountDownLatch getCountDownLatch(K key);
/**
* Returns RPermitExpirableSemaphore instance associated with key
*
* @param key - map key
* @return permitExpirableSemaphore
*/
RPermitExpirableSemaphore getPermitExpirableSemaphore(K key);
/**
* Returns RSemaphore instance associated with key
*
* @param key - map key
* @return semaphore
*/
RSemaphore getSemaphore(K key);
/**
* Returns RLock instance associated with key
*
* @param key - map key
* @return fairlock
*/
RLock getFairLock(K key);
/**
* Returns RReadWriteLock instance associated with key
*
* @param key - map key
* @return readWriteLock
*/
RReadWriteLock getReadWriteLock(K key);
/**
* Returns RLock instance associated with key
*
* @param key - map key
* @return lock
*/
RLock getLock(K key);
/**
* Returns the number of key-value pairs in this multimap.
*
* @return size of multimap
*/
int size();
/**
* Check is map empty
*
* @return true if empty
*/
boolean isEmpty();
/**
* Returns {@code true} if this multimap contains at least one key-value pair
* with the key {@code key}.
*
* @param key - map key
* @return true if contains a key
*/
boolean containsKey(Object key);
/**
* Returns {@code true} if this multimap contains at least one key-value pair
* with the value {@code value}.
*
* @param value - map value
* @return true if contains a value
*/
boolean containsValue(Object value);
/**
* Returns {@code true} if this multimap contains at least one key-value pair
* with the key {@code key} and the value {@code value}.
*
* @param key - map key
* @param value - map value
* @return true if contains an entry
*/
boolean containsEntry(Object key, Object value);
/**
* Stores a key-value pair in this multimap.
*
* Some multimap implementations allow duplicate key-value pairs, in which
* case {@code put} always adds a new key-value pair and increases the
* multimap size by 1. Other implementations prohibit duplicates, and storing
* a key-value pair that's already in the multimap has no effect.
*
* @param key - map key
* @param value - map value
* @return {@code true} if the method increased the size of the multimap, or
* {@code false} if the multimap already contained the key-value pair and
* doesn't allow duplicates
*/
boolean put(K key, V value);
/**
* Removes a single key-value pair with the key {@code key} and the value
* {@code value} from this multimap, if such exists. If multiple key-value
* pairs in the multimap fit this description, which one is removed is
* unspecified.
*
* @param key - map key
* @param value - map value
* @return {@code true} if the multimap changed
*/
boolean remove(Object key, Object value);
/**
* Stores a key-value pair in this multimap for each of {@code values}, all
* using the same key, {@code key}. Equivalent to (but expected to be more
* efficient than):
{@code
*
* for (V value : values) {
* put(key, value);
* }}
*
* In particular, this is a no-op if {@code values} is empty.
*
* @param key - map key
* @param values - map values
* @return {@code true} if the multimap changed
*/
boolean putAll(K key, Iterable values);
/**
* Stores a collection of values with the same key, replacing any existing
* values for that key.
*
*
If {@code values} is empty, this is equivalent to
* {@link #removeAll(Object) removeAll(key)}.
*
* @param key - map key
* @param values - map values
* @return the collection of replaced values, or an empty collection if no
* values were previously associated with the key. The collection
* may be modifiable, but updating it will have no effect on the
* multimap.
*/
Collection replaceValues(K key, Iterable values);
/**
* Removes all values associated with the key {@code key}.
*
* Once this method returns, {@code key} will not be mapped to any values
*
Use {@link RMultimap#fastRemove} if values are not needed.
*
* @param key - map key
* @return the values that were removed (possibly empty). The returned
* collection may be modifiable, but updating it will have no
* effect on the multimap.
*/
Collection removeAll(Object key);
/**
* Removes all key-value pairs from the multimap, leaving it {@linkplain
* #isEmpty empty}.
*/
void clear();
/**
* Returns a view collection of the values associated with {@code key} in this
* multimap, if any. Note that when {@code containsKey(key)} is false, this
* returns an empty collection, not {@code null}.
*
* Changes to the returned collection will update the underlying multimap,
* and vice versa.
*
* @param key - map key
* @return collection of values
*/
Collection get(K key);
/**
* Returns all elements at once. Result collection is NOT backed by map,
* so changes are not reflected in map.
*
* @param key - map key
* @return collection of values
*/
Collection getAll(K key);
/**
* Returns a view collection of all distinct keys contained in this
* multimap. Note that the key set contains a key if and only if this multimap
* maps that key to at least one value.
*
* Changes to the returned set will update the underlying multimap, and
* vice versa. However, adding to the returned set is not possible.
*
* @return set of keys
*/
Set keySet();
/**
* Returns the count of distinct keys in this multimap.
*
* @return keys amount
*/
int keySize();
/**
* Returns a view collection containing the value from each key-value
* pair contained in this multimap, without collapsing duplicates (so {@code
* values().size() == size()}).
*
* Changes to the returned collection will update the underlying multimap,
* and vice versa. However, adding to the returned collection is not
* possible.
*
* @return collection of values
*/
Collection values();
/**
* Returns a view collection of all key-value pairs contained in this
* multimap, as {@link Map.Entry} instances.
*
* Changes to the returned collection or the entries it contains will
* update the underlying multimap, and vice versa. However, adding to
* the returned collection is not possible.
*
* @return collection of entries
*/
Collection> entries();
/**
* Removes keys from map by one operation
*
* Works faster than RMultimap.remove but not returning
* the value associated with key
*
* @param keys - map keys
* @return the number of keys that were removed from the hash, not including specified but non existing keys
*/
long fastRemove(K... keys);
/**
* Read all keys at once
*
* @return keys
*/
Set readAllKeySet();
}