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 * Copyright (c) Contributors to the Eclipse Foundation
 *
 * 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
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 *     http://www.apache.org/licenses/LICENSE-2.0
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package org.osgi.util.promise;

import org.osgi.annotation.versioning.ConsumerType;

/**
 * Failure callback for a Promise.
 * 
 * 

* 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. * *

* This is a functional interface and can be used as the assignment target for a * lambda expression or method reference. * * @ThreadSafe * @author $Id: e5dcd1ce775ff13a04c6b9d99c1bb4b5d0bbe080 $ */ @ConsumerType @FunctionalInterface public interface Failure { /** * Failure callback for a Promise. * *

* This method is called if the Promise with which it is registered resolves * with a failure. * *

* 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. * *

* 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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