﻿// 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.Context;
using Org.Apache.REEF.Driver.Task;
using Org.Apache.REEF.Tang.Annotations;
using Org.Apache.REEF.Utilities;

namespace Org.Apache.REEF.Examples.AllHandlers
{
    /// <summary>
    /// Sample implementation of RunningTaskHandler when driver is restarted
    /// </summary>
    public class HelloDriverRestartRunningTaskHandler : IObserver<IRunningTask>
    {
        [Inject]
        private HelloDriverRestartRunningTaskHandler()
        {
        }

        /// <summary>
        /// Sending message to running task
        /// </summary>
        /// <param name="runningTask"></param>
        public void OnNext(IRunningTask runningTask)
        {
            IActiveContext context = runningTask.ActiveContext;

            Console.WriteLine(string.Format(
                CultureInfo.InvariantCulture,
                "HelloDriverRestartRunningTaskHandler: Task [{0}] is running after driver restart. Evaluator id: [{1}].",
                runningTask.Id,
                context.EvaluatorId));

            runningTask.Send(ByteUtilities.StringToByteArrays(
                string.Format(
                CultureInfo.InvariantCulture,
                "Hello, task {0}! Glad to know that you are still running in Evaluator {1} after driver restart!",
                runningTask.Id,
                context.EvaluatorId)));
        }

        public void OnError(Exception error)
        {
            throw new NotImplementedException();
        }

        public void OnCompleted()
        {
            throw new NotImplementedException();
        }
    }
}