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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.AtomicLong.
*/
public interface AtomicCounter {
/**
* Atomically increment by one the current value.
*
* @return updated value
*/
long incrementAndGet();
/**
* Atomically increment by one the current value.
*
* @return previous value
*/
long getAndIncrement();
/**
* Atomically adds the given value to the current value.
*
* @param delta the value to add
* @return previous value
*/
long getAndAdd(long delta);
/**
* Atomically adds the given value to the current value.
*
* @param delta the value to add
* @return updated value
*/
long addAndGet(long delta);
/**
* Atomically sets the given value to the current value.
*
* @param value the value to set
*/
void set(long value);
/**
* Atomically sets the given counter to the updated value if the current value is the expected value, otherwise
* no change occurs.
* @param expectedValue the expected current value of the counter
* @param updateValue the new value to be set
* @return true if the update occurred and the expected value was equal to the current value, false otherwise
*/
boolean compareAndSet(long expectedValue, long updateValue);
/**
* Returns the current value of the counter without modifying it.
*
* @return current value
*/
long get();
}
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