org.onosproject.store.service.ConsistentMap Maven / Gradle / Ivy
/*
* Copyright 2015 Open Networking Laboratory
*
* 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 java.util.Collection;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.function.Predicate;
/**
* {@code ConsistentMap} provides the same functionality as {@link AsyncConsistentMap} with
* the only difference that all its methods block until the corresponding operation completes.
*
* @param type of key
* @param type of value
*/
public interface ConsistentMap extends DistributedPrimitive {
/**
* Returns the number of entries in the map.
*
* @return map size.
*/
int size();
/**
* Returns true if the map is empty.
*
* @return true if map has no entries, false otherwise
*/
boolean isEmpty();
/**
* Returns true if this map contains a mapping for the specified key.
*
* @param key key
* @return true if map contains key, false otherwise
*/
boolean containsKey(K key);
/**
* Returns true if this map contains the specified value.
*
* @param value value
* @return true if map contains value, false otherwise.
*/
boolean containsValue(V value);
/**
* Returns the value (and version) to which the specified key is mapped, or null if this
* map contains no mapping for the key.
*
* @param key the key whose associated value (and version) is to be returned
* @return the value (and version) to which the specified key is mapped, or null if
* this map contains no mapping for the key
*/
Versioned get(K key);
/**
* If the specified key is not already associated with a value (or is mapped to null),
* attempts to compute its value using the given mapping function and enters it into
* this map unless null.
*
* @param key key with which the specified value is to be associated
* @param mappingFunction the function to compute a value
* @return the current (existing or computed) value associated with the specified key,
* or null if the computed value is null. Method throws {@code ConsistentMapException.ConcurrentModification}
* if a concurrent modification of map is detected
*/
Versioned computeIfAbsent(K key,
Function mappingFunction);
/**
* Attempts to compute a mapping for the specified key and its current mapped value (or
* null if there is no current mapping).
* If the computed value is null, the current mapping will be removed from the map.
*
* @param key key with which the specified value is to be associated
* @param remappingFunction the function to compute a value
* @return the new value associated with the specified key, or null if none.
* This method throws {@code ConsistentMapException.ConcurrentModification}
* if a concurrent modification of map is detected
*/
Versioned compute(K key,
BiFunction remappingFunction);
/**
* If the value for the specified key is present and non-null, attempts to compute a new
* mapping given the key and its current mapped value.
* If the computed value is null, the current mapping will be removed from the map.
*
* @param key key with which the specified value is to be associated
* @param remappingFunction the function to compute a value
* @return the new value associated with the specified key, or null if none.
* This method throws {@code ConsistentMapException.ConcurrentModification}
* if a concurrent modification of map is detected
*/
Versioned computeIfPresent(K key,
BiFunction remappingFunction);
/**
* If the value for the specified key satisfies a condition, attempts to compute a new
* mapping given the key and its current mapped value.
* If the computed value is null, the current mapping will be removed from the map.
*
* @param key key with which the specified value is to be associated
* @param condition condition that should evaluate to true for the computation to proceed
* @param remappingFunction the function to compute a value
* @return the new value associated with the specified key, or the old value if condition evaluates to false.
* This method throws {@code ConsistentMapException.ConcurrentModification} if a concurrent
* modification of map is detected
*/
Versioned computeIf(K key,
Predicate condition,
BiFunction remappingFunction);
/**
* Associates the specified value with the specified key in this map (optional operation).
* If the map previously contained a mapping for the key, the old value is replaced by the
* specified value.
*
* @param key key with which the specified value is to be associated
* @param value value to be associated with the specified key
* @return the previous value (and version) associated with key, or null if there was
* no mapping for key.
*/
Versioned put(K key, V value);
/**
* Associates the specified value with the specified key in this map (optional operation).
* If the map previously contained a mapping for the key, the old value is replaced by the
* specified value.
*
* @param key key with which the specified value is to be associated
* @param value value to be associated with the specified key
* @return new value.
*/
Versioned putAndGet(K key, V value);
/**
* Removes the mapping for a key from this map if it is present (optional operation).
*
* @param key key whose value is to be removed from the map
* @return the value (and version) to which this map previously associated the key,
* or null if the map contained no mapping for the key.
*/
Versioned remove(K key);
/**
* Removes all of the mappings from this map (optional operation).
* The map will be empty after this call returns.
*/
void clear();
/**
* Returns a Set view of the keys contained in this map.
* This method differs from the behavior of java.util.Map.keySet() in that
* what is returned is a unmodifiable snapshot view of the keys in the ConsistentMap.
* Attempts to modify the returned set, whether direct or via its iterator,
* result in an UnsupportedOperationException.
*
* @return a set of the keys contained in this map
*/
Set keySet();
/**
* Returns the collection of values (and associated versions) contained in this map.
* This method differs from the behavior of java.util.Map.values() in that
* what is returned is a unmodifiable snapshot view of the values in the ConsistentMap.
* Attempts to modify the returned collection, whether direct or via its iterator,
* result in an UnsupportedOperationException.
*
* @return a collection of the values (and associated versions) contained in this map
*/
Collection> values();
/**
* Returns the set of entries contained in this map.
* This method differs from the behavior of java.util.Map.entrySet() in that
* what is returned is a unmodifiable snapshot view of the entries in the ConsistentMap.
* Attempts to modify the returned set, whether direct or via its iterator,
* result in an UnsupportedOperationException.
*
* @return set of entries contained in this map.
*/
Set>> entrySet();
/**
* If the specified key is not already associated with a value
* associates it with the given value and returns null, else returns the current value.
*
* @param key key with which the specified value is to be associated
* @param value value to be associated with the specified key
* @return the previous value associated with the specified key or null
* if key does not already mapped to a value.
*/
Versioned putIfAbsent(K key, V value);
/**
* Removes the entry for the specified key only if it is currently
* mapped to the specified value.
*
* @param key key with which the specified value is associated
* @param value value expected to be associated with the specified key
* @return true if the value was removed
*/
boolean remove(K key, V value);
/**
* Removes the entry for the specified key only if its current
* version in the map is equal to the specified version.
*
* @param key key with which the specified version is associated
* @param version version expected to be associated with the specified key
* @return true if the value was removed
*/
boolean remove(K key, long version);
/**
* Replaces the entry for the specified key only if there is any value
* which associated with specified key.
*
* @param key key with which the specified value is associated
* @param value value expected to be associated with the specified key
* @return the previous value associated with the specified key or null
*/
Versioned replace(K key, V value);
/**
* Replaces the entry for the specified key only if currently mapped
* to the specified value.
*
* @param key key with which the specified value is associated
* @param oldValue value expected to be associated with the specified key
* @param newValue value to be associated with the specified key
* @return true if the value was replaced
*/
boolean replace(K key, V oldValue, V newValue);
/**
* Replaces the entry for the specified key only if it is currently mapped to the
* specified version.
*
* @param key key key with which the specified value is associated
* @param oldVersion version expected to be associated with the specified key
* @param newValue value to be associated with the specified key
* @return true if the value was replaced
*/
boolean replace(K key, long oldVersion, V newValue);
/**
* Registers the specified listener to be notified whenever the map is updated.
*
* @param listener listener to notify about map events
*/
void addListener(MapEventListener listener);
/**
* Unregisters the specified listener such that it will no longer
* receive map change notifications.
*
* @param listener listener to unregister
*/
void removeListener(MapEventListener listener);
/**
* Returns a java.util.Map instance backed by this ConsistentMap.
* @return java.util.Map
*/
Map asJavaMap();
}
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