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/*
* Copyright 2006-2012 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. 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.
*/
package com.amazon.carbonado.capability;
/**
* Capability for repositories that require special attention with the Java
* virtual machine exits.
*
* @author Brian S O'Neill
*/
public interface ShutdownCapability extends Capability {
/**
* Returns true if repository has a shutdown hook registered to
* automatically call shutdown when the virtual machine exits.
*/
boolean isAutoShutdownEnabled();
/**
* Request to enable or disable the automatic shutdown hook. Repository may
* ignore this request if shutdown is in progress.
*
* @throws SecurityException if caller does not have permission
*/
void setAutoShutdownEnabled(boolean enabled);
/**
* Similar to calling close on a repository, except should only be called
* when the virtual machine is in the process of shutting down. Calling
* close may cause spurious exceptions to be thrown by other threads which
* may be interacting with the repository. Shutdown tries to reduce these
* exceptions from being thrown by effectively <i>suspending</i> any
* threads which continue to interact with this repository. <b>For this
* reason, this method should only ever be called during a virtual machine
* shutdown.</b>
*
* <p>Repositories may choose to implement this method by simply calling
* close. There is no guarantee that shutdown will reduce exceptions, and
* it might not suspend any threads. Also, repositories that require proper
* shutdown should automatically register runtime hooks, and so this method
* usually doesn't need to be called manually.
*
* @throws SecurityException if caller does not have permission
*/
void shutdown();
}
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