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/*
* Copyright 2014 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;
import org.onosproject.event.Event;
/**
* Abstraction of a entity capable of storing and/or distributing information
* across a cluster.
*/
public interface Store<E extends Event, D extends StoreDelegate<E>> {
/**
* Sets the delegate on the store.
*
* @param delegate new store delegate
* @throws java.lang.IllegalStateException if a delegate is already
* currently set on the store and is a different one that
*/
void setDelegate(D delegate);
/**
* Withdraws the delegate from the store.
*
* @param delegate store delegate to withdraw
* @throws java.lang.IllegalArgumentException if the delegate is not
* currently set on the store
*/
void unsetDelegate(D delegate);
/**
* Indicates whether the store has a delegate.
*
* @return true if delegate is set
*/
boolean hasDelegate();
}
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