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/*
* Copyright (c) OSGi Alliance (2014). 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 org.osgi.util.promise;
import org.osgi.annotation.versioning.ConsumerType;
/**
* Failure callback for a Promise.
*
* <p>
* A Failure callback is registered with a {@link Promise} using the
* {@link Promise#then(Success, Failure)} method and is called if the Promise is
* resolved with a failure.
*
* <p>
* This is a functional interface and can be used as the assignment target for a
* lambda expression or method reference.
*
* @ThreadSafe
* @author $Id$
*/
@ConsumerType
public interface Failure {
/**
* Failure callback for a Promise.
*
* <p>
* This method is called if the Promise with which it is registered resolves
* with a failure.
*
* <p>
* In the remainder of this description we will refer to the Promise
* returned by {@link Promise#then(Success, Failure)} when this Failure
* callback was registered as the chained Promise.
*
* <p>
* If this methods completes normally, the chained Promise must be failed
* with the same exception which failed the resolved Promise. If this method
* throws an exception, the chained Promise must be failed with the thrown
* exception.
*
* @param resolved The failed resolved {@link Promise}.
* @throws Exception The chained Promise must be failed with the thrown
* exception.
*/
void fail(Promise<?> resolved) throws Exception;
}
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