| /* |
| * 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: a4bd1ef9948a4abb9fc01a140bd9562be0beb9aa $ |
| */ |
| @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 will be failed |
| * with the same exception which failed the resolved Promise. If this method |
| * throws an exception, the chained Promise will be failed with the thrown |
| * exception. |
| * |
| * @param resolved The failed resolved {@link Promise}. |
| * @throws Exception The chained Promise will be failed with the thrown |
| * exception. |
| */ |
| void fail(Promise<?> resolved) throws Exception; |
| } |