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/*
* ============LICENSE_START=======================================================
* policy-core
* ================================================================================
* Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.common.capabilities;
/**
* Interface for classes that supports start-like operations.
*/
public interface Startable {
/**
* Start operation. This operation starts the entity.
*
* @return boolean. true if the start operation was successful, otherwise false.
* @throws IllegalStateException. if the element is in a state that conflicts with the start
* operation.
*/
public boolean start();
/**
* Stop operation. The entity can be restarted again by invoking the start operation.
*
* @return boolean. true if the stop operation was successful, otherwise false.
* @throws IllegalStateException. if the element is in a state that conflicts with the stop
* operation.
*/
public boolean stop();
/**
* shutdown operation. The terminate operation yields the entity unusuable. It cannot be
* (re)started.
*
* @throws IllegalStateException. if the element is in a state that conflicts with the stop
* operation.
*/
public void shutdown();
/**
* Checks if the entity is alive.
*
* @return boolean. true if alive, otherwise false
*/
public boolean isAlive();
}
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