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/*
* Copyright 2014-2017 Amazon.com, 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.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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.ibm.cloud.objectstorage.internal;
import java.io.Closeable;
/**
* Used for releasing a resource.
*
* For example, the creation of a ResettableInputStream would entail
* physically opening a file. If the opened file is meant to be closed only (in
* a finally block) by the very same code block that created it, then it is
* necessary that the release method must not be called while the execution is
* made in other stack frames.
*
* In such case, as other stack frames may inadvertently or indirectly call the
* close method of the stream, the creator of the stream would need to
* explicitly disable the accidental closing via
* ResettableInputStream#disableClose(), so that the release method
* becomes the only way to truly close the opened file.
*/
public interface Releasable {
/**
* Releases the allocated resource. This method should not be called except
* by the caller who allocated the resource at the very top of the call
* stack. This allows, typically, a {@link Closeable} resource to be not
* unintentionally released owing to the calling of the
* {@link Closeable#close()} methods by implementation deep down in the call
* stack.
*
* For example, the creation of a ResettableInputStream would entail
* physically opening a file. If the opened file is meant to be closed only
* (in a finally block) by the very same code block that created it, then it
* is necessary that the release method must not be called while the
* execution is made in other stack frames.
*
* In such case, as other stack frames may inadvertently or indirectly call
* the close method of the stream, the creator of the stream would need to
* explicitly disable the accidental closing via
* ResettableInputStream#disableClose(), so that the release method
* becomes the only way to truly close the opened file.
*/
public void release();
}