﻿// 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.Evaluator;
using Org.Apache.REEF.Tang.Annotations;

namespace Org.Apache.REEF.Examples.AllHandlers
{
    /// <summary>
    /// A sample implementation of DriverRestartActiveContextHandler
    /// </summary>
    public class HelloDriverRestartActiveContextHandler : IObserver<IActiveContext>
    {
        [Inject]
        private HelloDriverRestartActiveContextHandler()
        {
        }

        /// <summary>
        /// It is called when receiving an active context
        /// </summary>
        /// <param name="activeContext"></param>
        public void OnNext(IActiveContext activeContext)
        {
            Console.WriteLine(
                string.Format(
                    CultureInfo.InvariantCulture,
                    "Active context {0} received after driver restart, from evaluator {1}",
                    activeContext.Id,
                    activeContext.EvaluatorId));

            IEvaluatorDescriptor evaluatorDescriptor = activeContext.EvaluatorDescriptor;
            string ipAddress = evaluatorDescriptor.NodeDescriptor.InetSocketAddress.Address.ToString();
            int port = evaluatorDescriptor.NodeDescriptor.InetSocketAddress.Port;
            string hostName = evaluatorDescriptor.NodeDescriptor.HostName;

            Console.WriteLine(
                string.Format(
                CultureInfo.InvariantCulture, 
                "The running evaluator allocated by previous driver is assigned with {0} MB of memory and is running at ip: {1} and port {2}, with hostname {3}", 
                evaluatorDescriptor.Memory, 
                ipAddress, 
                port, 
                hostName));
        }

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

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