StationServer.cs

using Opc.Ua;
using Opc.Ua.Server;
using System.Collections.Generic;
using System.Reflection;
using System.Threading;

namespace CfStation
{
    public partial class StationServer : StandardServer
    {
        /// <summary>
        /// Creates the node managers for the server.
        /// </summary>
        /// <remarks>
        /// This method allows the sub-class create any additional node managers which it uses. The SDK
        /// always creates a CoreNodeManager which handles the built-in nodes defined by the specification.
        /// Any additional NodeManagers are expected to handle application specific nodes.
        /// </remarks>
        protected override MasterNodeManager CreateMasterNodeManager(IServerInternal server, ApplicationConfiguration configuration)
        {
            List<INodeManager> nodeManagers = new List<INodeManager>
            {
                new StationNodeManager(server, configuration)
            };

            return new MasterNodeManager(server, configuration, null, nodeManagers.ToArray());
        }

        /// <summary>
        /// Loads the non-configurable properties for the application.
        /// </summary>
        /// <remarks>
        /// These properties are exposed by the server but cannot be changed by administrators.
        /// </remarks>
        protected override ServerProperties LoadServerProperties()
        {
            ServerProperties properties = new ServerProperties
            {
                ManufacturerName = "Microsoft",
                ProductName = "IoT Edge OPC Connectedfactory Station",
                ProductUri = "https://github.com/Azure/azure-iot-connected-factory-cfstation.git",
                SoftwareVersion = Utils.GetAssemblySoftwareVersion(),
                BuildNumber = Utils.GetAssemblyBuildNumber(),
                BuildDate = Utils.GetAssemblyTimestamp()
            };
            return properties; 
        }

        /// <summary>
        /// Creates the resource manager for the server.
        /// </summary>
        protected override ResourceManager CreateResourceManager(IServerInternal server, ApplicationConfiguration configuration)
        {
            ResourceManager resourceManager = new ResourceManager(server, configuration);

            System.Reflection.FieldInfo[] fields = typeof(StatusCodes).GetFields(BindingFlags.Public | System.Reflection.BindingFlags.Static);

            foreach (System.Reflection.FieldInfo field in fields)
            {
                uint? id = field.GetValue(typeof(StatusCodes)) as uint?;

                if (id != null)
                {
                    resourceManager.Add(id.Value, "en-US", field.Name);
                }
            }

            return resourceManager;
        }

        /// <summary>
        /// Cleans up before the server shuts down.
        /// </summary>
        /// <remarks>
        /// This method is called before any shutdown processing occurs.
        /// </remarks>
        protected override void OnServerStopping()
        {
            try
            {
                // check for connected clients
                IList<Session> currentessions = this.ServerInternal.SessionManager.GetSessions();

                if (currentessions.Count > 0)
                {
                    // provide some time for the connected clients to detect the shutdown state.
                    ServerInternal.Status.Value.ShutdownReason = new LocalizedText("en-US", "Application closed.");
                    ServerInternal.Status.Variable.ShutdownReason.Value = new LocalizedText("en-US", "Application closed.");
                    ServerInternal.Status.Value.State = ServerState.Shutdown;
                    ServerInternal.Status.Variable.State.Value = ServerState.Shutdown;
                    ServerInternal.Status.Variable.ClearChangeMasks(ServerInternal.DefaultSystemContext, true);

                    for (uint timeTillShutdown = _stationShutdownWaitPeriod; timeTillShutdown > 0; timeTillShutdown--)
                    {
                        ServerInternal.Status.Value.SecondsTillShutdown = timeTillShutdown;
                        ServerInternal.Status.Variable.SecondsTillShutdown.Value = timeTillShutdown;
                        ServerInternal.Status.Variable.ClearChangeMasks(ServerInternal.DefaultSystemContext, true);

                        Thread.Sleep(1000);
                    }
                }
            }
            catch
            {
                // ignore error during shutdown procedure.
            }

            base.OnServerStopping();
        }

        private static uint _stationShutdownWaitPeriod = 10;
    }
}