Component Port

Tizen components of the component-based applications can communicate with each other using component ports. Components can send and receive serializable objects through component port communication.

The main feature of the Tizen.Applications.ComponentBased.ComponentPort class includes the following:

  • Managing component port

    You can set up the component ports to send and receive requests between components of component-based applications with the Tizen.Applications.ComponentBased.ComponentPort class.

  • Using component task

    You can set up the component tasks to run tasks and wait for events from other components with the Tizen.Applications.ComponentBased.ComponentTask class.

Prerequisites

To enable your component to use the component port functionality, follow these steps:

  1. You need two components to communicate with each other through the component port.
  2. To use the methods and properties of the Tizen.Applications.ComponentBased.ComponentPort and Tizen.Applications.ComponentBased.ComponentTask classes, include the Tizen.Applications.ComponentBased namespace in your component:- API Reference

Manage component port

To send a request from one component ClientService.Tizen to another ServerService.Tizen component, use the Tizen.Applications.ComponentBased.ComponentPort class as follows:

  1. Create a component port instance for sending component ClientService.Tizen as follows:

    
                
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    namespace ClientService.Tizen
{
    [Serializable]
    public class Request
    {
        public Request(string command, int sequence, string message)
        {
            Command = command;
            Sequence = sequence;
            Message = message;
        }

        public string Command
        {
            get; set;
        }

        public string Message
        {
            get; set;
        }

        public int Sequence
        {
            get; set;
        }
    }

    [Serializable]
    public class Response
    {
        public Response(string command, int sequence, int result)
        {
            Command = command;
            Sequence = sequence;
            Result = result;
        }

        public string Command
        {
            get; set;
        }

        public int Sequence
        {
            get; set;
        }

        public int Result
        {
            get; set;
        }
    }

    public class ClientService : ServiceComponent
    {
        private static string LogTag = "ClientService";
        private static int _seq = 0;
        private ComponentPort _port;

        public override override OnCreate()
        {
            Log.Info("OnCreate()");
            base.OnCreate();
            _port = new ComponentPort("ClientService");
            return true;
        }

        public override void OnStartCommand(AppControl appControl, bool restarted)
        {
            Log.Info("OnStartCommand()");
            base.OnStartCommand(appControl, restarted);
        }

        public override void OnDestroy()
        {
            Log.Info("OnDestroy()");
            base.OnDestroy();

            if (_port != null)
            {
                _port.Dispose();
                _port = null;
            }
        }
    }
}

  2. Create a component port instance for receiving component ServerService.Tizen as follows:

    
                
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    namespace ServerService.Tizen
{
    [Serializable]
    public class Request
    {
        public Request(string command, int sequence, string message)
        {
            Command = command;
            Sequence = sequence;
            Message = message;
        }

        public string Command
        {
            get; set;
        }

        public string Message
        {
            get; set;
        }

        public int Sequence
        {
            get; set;
        }
    }

    [Serializable]
    public class Response
    {
        public Response(string command, int sequence, int result)
        {
            Command = command;
            Sequence = sequence;
            Result = result;
        }

        public string Command
        {
            get; set;
        }

        public int Sequence
        {
            get; set;
        }

        public int Result
        {
            get; set;
        }
    }

    public class ServerService : ServiceComponent
    {
        private static string LogTag = "ServerService";
        private ComponentPort _port;
        private Thread _thread;

        private void OnRequestedReceived(object sender, RequestEventArgs args)
        {
            Log.Info("Sender: " + args.Sender);
            var request = args.Request;
            if (request.GetType() == typeof(Request))
            {
                var req = (Request)request;
                Log.Info("Command: " + req.Command);
                Log.Info("Sequence: " + req.Sequence);
                Log.Info("Message: " + req.Message);

                if (args.IsReplyRequested)
                {
                    args.Reply = new Response(req.Command, req.Sequence, 0);
                }
            }
        }

        private void OnThread()
        {
            Log.Info("OnTrhead()");
            _port.WaitForEvent();
        }

        public override override OnCreate()
        {
            Log.Info("OnCreate()");
            base.OnCreate();
            _port = new ComponentPort("ServerService");
            _port.RequestReceived += OnRequestReceived;
            _thread = new Thread(new ThreadStart(OnThread));
            _thread.Start();
            return true;
        }

        public override void OnStartCommand(AppControl appControl, bool restarted)
        {
            Log.Info("OnStartCommand()");
            base.OnStartCommand(appControl, restarted);
        }

        public override void OnDestroy()
        {
            Log.Info("OnDestroy()");
            base.OnDestroy();

            if (_port != null)
            {
                _port.RequestReceived -= OnRequestReceived;
                _port.Dispose();
                _port = null;
            }
        }
    }
}

  3. Set up the receiving thread of the component by following these steps:

    1. To have the receiving thread of the component wait for incoming requests, call WaitForEvent() of the Tizen.Applications.ComponentBased.ComponentPort class.

    2. If WaitForEvent() is called in the main thread, then WaitForEvent() can not be called until the Cancel() is called.

    3. WaitForEvent() starts the main loop to wait for events from other components. To avoid blocking the main thread, it is recommended to use the Tizen.Applications.ComponentBased.ComponentTask class.

    4. To handle the access control, call AddPrivilege() of the Tizen.Applications.ComponentBased.ComponentPort class. If a client does not have permission, the request is rejected with the permission denied error.

    5. To handle the received request, define and register an event handler for the RequestReceived event of the Tizen.Applications.ComponentBased.ComponentPort class as follows:

      
                
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      {
    _port = new ComponentPort("ServerService");
    _port.RequestReceived += OnRequestReceived;
    _port.AddPrivilege("http://tizen.org/privilege/datasharing");
    _thread = new Thread(new ThreadStart(OnThread));
    _thread.Start();
}

private void OnThread()
{
    Log.Info("OnTrhead()");
    _port.WaitForEvent();
}

private void OnRequestedReceived(object sender, RequestEventArgs args)
{
    Log.Info("Sender: + args.Sender);
    var request = args.Request;
    if (request.GetType() == typeof(Request))
    {
        var req = (Request)request;
        Log.Info("Command: " + req.Command);
        Log.Info("Sequence: " + req.Sequence);
        Log.Info("Message: " + req.Message);

        if (args.IsReplyRequested)
        {
            args.Reply = new Response(req.Command, req.Sequence, 0);
        }
    }
}

  4. Send the request in the sending component as follows:

    1. Call WaitForEvent() of the Tizen.Applications.ComponentBased.ComponentPort class in the thread, if you want to receive the reply from ServerService.Tizen.

    2. Call WaitForPort() of the Tizen.Applications.ComponentBased.ComponentPort class to wait until the target port is ready.

    3. Use Send() of the Tizen.Applications.ComponentBased.ComponentPort class to send the request.

    4. Provide the request to be sent as an instance of the ClientService.Tizen.Request class as follows:

      
                
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      {
    _port = new ComponentPort("ClientService");
    _port.RequestReceived += OnRequestReceived;
    _thread = new Thread(new ThreadStart(OnThread));
    _thread.Start();
    ...
    await ComponentPort.WaitForPort("ServerService");
    try
    {
        var request = new Request("TestCommand", _seq++, "TestMessage");
        _port.Send("ServerService", 5000, request);
    }
    catch
    {
        Log.Error("Failed to send request");
    }
        ...
}

private void OnThread()
{
    Log.Info("OnTrhead()");
    _port.WaitForEvent();
}

private void OnRequestedReceived(object sender, RequestEventArgs args)
{
    Log.Info("Sender: + args.Sender);
    var response = args.Request;
    if (response.GetType() == typeof(Response))
    {
        var req = (Response)request;
        Log.Info("Command: " + req.Command);
        Log.Info("Sequence: " + req.Sequence);
        Log.Info("Result: " + req.Result);
    }
}

Use component task

Using Tizen.Applications.ComponentBased.ComponentTask class, a component can run a task to wait for events from other components properly.

  1. Create a component task instance for receiving component ServerService.Tizen as follows:

    
                
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    namespace ServerService.Tizen
{
    [Serializable]
    public class Request
    {
        public Request(string command, int sequence, string message)
        {
            Command = command;
            Sequence = sequence;
            Message = message;
        }

        public string Command
        {
            get; set;
        }

        public string Message
        {
            get; set;
        }

        public int Sequence
        {
            get; set;
        }
    }

    [Serializable]
    public class Response
    {
        public Response(string command, int sequence, int result)
        {
            Command = command;
            Sequence = sequence;
            Result = result;
        }

        public string Command
        {
            get; set;
        }

        public int Sequence
        {
            get; set;
        }

        public int Result
        {
            get; set;
        }
    }

    public class ServerService : ServiceComponent
    {
        private static string LogTag = "ServerService";
        private ComponentPort _port;
        private ComponentTask _task;

        private void OnRequestedReceived(object sender, RequestEventArgs args)
        {
            Log.Info("Sender: + args.Sender);
            var request = args.Request;
            if (request.GetType() == typeof(Request))
            {
                var req = (Request)request;
                Log.Info("Command: " + req.Command);
                Log.Info("Sequence: " + req.Sequence);
                Log.Info("Message: " + req.Message);

                if (args.IsReplyRequested)
                {
                    args.Reply = new Response(req.Command, req.Sequence, 0);
                }
            }
        }

        public override override OnCreate()
        {
            Log.Info("OnCreate()");
            base.OnCreate();
            _port = new ComponentPort("ServerService");
            _port.RequestReceived += OnRequestReceived;
            _task = new ComponentTask(_port);
            _task.Start();
            return true;
        }

        public override void OnStartCommand(AppControl appControl, bool restarted)
        {
            Log.Info("OnStartCommand()");
            base.OnStartCommand(appControl, restarted);
        }

        public override void OnDestroy()
        {
            Log.Info("OnDestroy()");
            base.OnDestroy();

            if (_task != null)
            {
                _task.Stop();
                _task = null;
            }

            if (_port != null)
            {
                _port.RequestReceived -= OnRequestReceived;
                _port.Dispose();
                _port = null;
            }
        }
    }
}

  2. To run the task, call the Start method of the Tizen.Applications.ComponentBased.ComponentTask class as follows:

    
                
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    _port = new ComponentPort("ServerService");
_port.RequestReceived += OnRequestReceived;
_task = new ComponentTask(_port);
_task.Start();
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