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/*
* 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;
/**
* Distributed version of java.util.concurrent.atomic.AtomicReference.
*
* @param <V> value type
*/
public interface AtomicValue<V> {
/**
* Atomically sets the value to the given updated value if the current value is equal to the expected value.
* <p>
* IMPORTANT: Equality is based on the equality of the serialized byte[] representations.
* <p>
* @param expect the expected value
* @param update the new value
* @return true if successful. false return indicates that the actual value was not equal to the expected value.
*/
boolean compareAndSet(V expect, V update);
/**
* Gets the current value.
* @return current value
*/
V get();
/**
* Atomically sets to the given value and returns the old value.
* @param value the new value
* @return previous value
*/
V getAndSet(V value);
/**
* Sets to the given value.
* @param value new value
*/
void set(V value);
/**
* Registers the specified listener to be notified whenever the atomic value is updated.
*
* @param listener listener to notify about events
*/
void addListener(AtomicValueEventListener<V> listener);
/**
* Unregisters the specified listener such that it will no longer
* receive atomic value update notifications.
*
* @param listener listener to unregister
*/
void removeListener(AtomicValueEventListener<V> listener);
}
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