| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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. |
| |
| using System; |
| using System.Globalization; |
| using Org.Apache.REEF.Driver.Task; |
| using Org.Apache.REEF.Tang.Annotations; |
| using Org.Apache.REEF.Utilities; |
| |
| namespace Org.Apache.REEF.Examples.AllHandlers |
| { |
| /// <summary> |
| /// A sample implementation of FailedTask Handler |
| /// </summary> |
| public class HelloFailedTaskHandler : IObserver<IFailedTask> |
| { |
| [Inject] |
| private HelloFailedTaskHandler() |
| { |
| } |
| |
| /// <summary> |
| /// Sample code close the active context when task is failed |
| /// </summary> |
| /// <param name="failedTask"></param> |
| public void OnNext(IFailedTask failedTask) |
| { |
| string errorMessage = string.Format( |
| CultureInfo.InvariantCulture, |
| "Task [{0}] has failed caused by [{1}], with message [{2}] and description [{3}]. The raw data for failure is [{4}].", |
| failedTask.Id, |
| failedTask.Reason.IsPresent() ? failedTask.Reason.Value : string.Empty, |
| failedTask.Message, |
| failedTask.Description.IsPresent() ? failedTask.Description.Value : string.Empty, |
| failedTask.Data.IsPresent() ? ByteUtilities.ByteArraysToString(failedTask.Data.Value) : string.Empty); |
| |
| Console.WriteLine(errorMessage); |
| |
| if (failedTask.GetActiveContext().IsPresent()) |
| { |
| Console.WriteLine("Disposing the active context the failed task ran in."); |
| |
| // we must do something here: either close the context or resubmit a task to the active context |
| failedTask.GetActiveContext().Value.Dispose(); |
| } |
| } |
| |
| public void OnCompleted() |
| { |
| throw new NotImplementedException(); |
| } |
| |
| public void OnError(Exception error) |
| { |
| throw new NotImplementedException(); |
| } |
| } |
| } |