Source code

001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.driver.context;
020
021import org.apache.reef.annotations.Provided;
022import org.apache.reef.annotations.audience.DriverSide;
023import org.apache.reef.annotations.audience.Public;
024import org.apache.reef.common.Failure;
025import org.apache.reef.util.Optional;
026
027/**
028 * Represents Context that failed.
029 * A typical case would be that its ContextStartHandler threw an exception.
030 * <p>
031 * The underlying Evaluator is still accessible and a new context can be established. Note that REEF can't guarantee
032 * consistency of the Evaluator for all applications. It is up to the application to decide whether it is safe to keep
033 * using the Evaluator.
034 */
035@Public
036@Provided
037@DriverSide
038public interface FailedContext extends Failure, ContextBase {
039
040  /**
041   * @return the new top of the stack of context if there is one.
042   */
043  Optional<ActiveContext> getParentContext();
044}