qr code dll vb net DEVELOPING A TRANSPORT CHANNEL in Visual Basic .NET

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CHAPTER 14 DEVELOPING A TRANSPORT CHANNEL
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_pop3Password = (String) _properties["pop3Password"]; _pop3Pollingtime = Convert.ToInt32((String) _properties["pop3PollInterval"]);
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// needed for CAOs! String[] urls = { this.GetURLBase() }; _channelData = new ChannelDataStore(urls); // collect channel data from all providers IServerChannelSinkProvider provider = _sinkProvider; while (provider != null) { provider.GetChannelData(_channelData); provider = provider.Next; } // create the sink chain IServerChannelSink snk = ChannelServices.CreateServerChannelSinkChain(_sinkProvider,this); // add the SMTPServerTransportSink as a first element to the chain _transportSink = new SMTPServerTransportSink(snk, _smtpServer, _myAddress); // start to listen this.StartListening(null); } The constructor calls GetURLBase(), which provides a way for this channel to return its base URL. private String GetURLBase() { return "smtp:" + _myAddress; } You also have to implement IChannel s methods and properties: Parse(), ChannelName, and ChannelPriority. The implementation itself looks exactly the same as it did for the clientside channel. public string Parse(string url, out string objectURI) { String email; SMTPHelper.parseURL(url, out email, out objectURI); if (email == null || email=="" || objectURI == null || objectURI =="") { return null; } else
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CHAPTER 14 DEVELOPING A TRANSPORT CHANNEL
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{ return "smtp:" + email; } } public string ChannelName { get { return _name; } } public int ChannelPriority { get { return 0; } } The single most important method of a server-side channel is StartListening(). Only after it is called will the server be able to receive requests and to handle them. In the SMTPServerChannel, this method registers its connection as a server with the POP3PollManager. It next registers the server-side transport sink and its e-mail address with the SMTPHelper. This last step will enable the helper to dispatch requests based on the destination e-mail address. public void StartListening(object data) { // register the POP3 account for polling POP3PollManager.RegisterPolling(_pop3Server,_pop3Username, _pop3Password,_pop3Pollingtime,true); // register the e-mail address as a server SMTPHelper.RegisterServer(_transportSink,_myAddress); } public void StopListening(object data) { // not needed ;-) } To enable CAOs to work correctly, you must implement the method GetUrlsForUri() and the property ChannelData. The first allows the framework to convert a given object s URI into a complete URL (including the protocol-specific part, such as smtp:user@host.com). The second returns the channel data object that is used by the framework to provide the complete URL for a client-activated object.
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CHAPTER 14 DEVELOPING A TRANSPORT CHANNEL
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public string[] GetUrlsForUri(string objectURI) { String[] urls; urls = new String[1]; if (!(objectURI.StartsWith("/"))) objectURI = "/" + objectURI; urls[0] = this.GetURLBase() + objectURI; return urls; } public object ChannelData { get { return _channelData; } }
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Creating the Server s Sink
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A server-side transport sink has to implement IServerChannelSink, which in turn extends IChannelSinkBase. You might already know the interfaces shown in Listing 14-6 from 13, where they were used to extend the remoting infrastructure. Listing 14-6. IChannelSinkBase and IServerChannelSink public interface IChannelSinkBase { IDictionary Properties { get; } } public interface IServerChannelSink : IChannelSinkBase { IServerChannelSink NextChannelSink { get; } ServerProcessing ProcessMessage(IServerChannelSinkStack sinkStack, IMessage requestMsg, ITransportHeaders requestHeaders, Stream requestStream, ref IMessage responseMsg, ref ITransportHeaders responseHeaders, ref Stream responseStream); void AsyncProcessResponse(IServerResponseChannelSinkStack sinkStack, object state, IMessage msg, ITransportHeaders headers, Stream stream); Stream GetResponseStream(IServerResponseChannelSinkStack sinkStack, object state, IMessage msg, ITransportHeaders headers); }
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CHAPTER 14 DEVELOPING A TRANSPORT CHANNEL
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The implementation of SMTPServerTransportSink is a little bit different from classic channel sinks. First and foremost, it is not created by a sink provider but instead directly by the channel that passes the reference to the next sink, the SMTP server s address and the server s own address to the newly created SMTPServerTransportSink. Additionally, you ll need a private class to hold state information about the origin of the request and its message ID to process the asynchronous replies. using using using using using System; System.IO; System.Runtime.Remoting.Channels; System.Runtime.Remoting; System.Runtime.Remoting.Messaging;
namespace SmtpChannel { public class SMTPServerTransportSink: IServerChannelSink { // will be used as a state object for the async reply private class SMTPState { internal String ID; internal String responseAddress; } private String _smtpServer; private String _myAddress; private IServerChannelSink _nextSink; public SMTPServerTransportSink(IServerChannelSink nextSink, String smtpServer, String myAddress) { _nextSink = nextSink; _smtpServer =smtpServer; _myAddress = myAddress; } One of the main differences between a server-side transport sink and a conventional channel sink is that the latter receives its parameters via the ProcessMessage() method. The transport sink instead does not define a specific way to receive the incoming request from the underlying transport mechanisms. In the case of the SMTPServerTransportSink, it receives a POP3Msg object from the SMTPHelper and processes it in HandleIncomingMessage(). It first splits the e-mail message into a Stream object and an ITransportHeaders object. It then creates a new state object of type SMTPState and populates its properties from the e-mail s values.
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