.net barcode DEVELOPING A TRANSPORT CHANNEL in Visual Basic .NET

Maker Denso QR Bar Code in Visual Basic .NET DEVELOPING A TRANSPORT CHANNEL

CHAPTER 14 DEVELOPING A TRANSPORT CHANNEL
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internal static void RequestSent() { _pendingResponses++; if (_lastPendingResponses<=0 && _pendingResponses > 0) { IEnumerator enmr = _listeners.GetEnumerator(); while (enmr.MoveNext()) { DictionaryEntry entr = (DictionaryEntry) enmr.Current; POP3Polling pop3 = (POP3Polling) entr.Value; pop3._needsPolling = true; pop3.CheckAndStartPolling(); } } _lastPendingResponses = _pendingResponses; } internal static void ResponseReceived() { _pendingResponses--; if (_pendingResponses <=0) { IEnumerator enmr = _listeners.GetEnumerator(); while (enmr.MoveNext()) { DictionaryEntry entr = (DictionaryEntry) enmr.Current; POP3Polling pop3 = (POP3Polling) entr.Value; pop3._needsPolling = false; } } _lastPendingResponses = _pendingResponses; }
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Connecting to .NET Remoting
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What you ve seen until now has been quite protocol specific, because I haven t yet covered any connections between the underlying protocol to .NET Remoting. This task is handled by the SMTPHelper class. This class holds three synchronized Hashtables containing the following data: Objects that are waiting for a response to a given SMTP message ID. These can be either Thread objects or SmtpChannel.AsyncResponseHandler objects, both of which are shown later. These are stored in _waitingFor. The server-side transport sink for any e-mail address that has been registered with a SMTPServerChannel in _servers. The received responses that will be cached while waking up the thread that has been blocked is stored in _responses. This is a short-term storage that is only used for the fractions of a second it takes for the thread to wake up and fetch and remove the response.
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CHAPTER 14 DEVELOPING A TRANSPORT CHANNEL
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This class also starts with a method that transforms the .NET Remoting specific information in the form of a stream and an ITransportHeaders object into an e-mail message. This method writes the standard e-mail headers, adds the remoting-specific headers from the ITransportHeaders object, encodes the stream s contents to Base64, and ensures a maximum line length of 73 characters. Finally, it sends the e-mail using the SmtpConnection helper class. using using using using using using System; System.Text; System.IO; System.Collections; System.Runtime.Remoting.Channels; System.Threading;
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namespace SmtpChannel { public class SMTPHelper { // threads waiting for response private static IDictionary _waitingFor = Hashtable.Synchronized(new Hashtable()); // known servers private static IDictionary _servers = Hashtable.Synchronized(new Hashtable()); // responses received private static IDictionary _responses = Hashtable.Synchronized(new Hashtable());
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// sending messages private static void SendMessage(String ID,String replyToId, String mailfrom, String mailto, String smtpServer, ITransportHeaders headers, Stream stream, String objectURI) { StringBuilder msg = new StringBuilder(); if (ID != null) { msg.Append("Message-Id: ").Append(ID).Append("\r\n"); } if (replyToId != null) { msg.Append("In-Reply-To: ").Append(replyToId).Append("\r\n"); }
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CHAPTER 14 DEVELOPING A TRANSPORT CHANNEL
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msg.Append("From: ").Append(mailfrom).Append("\r\n"); msg.Append("To: ").Append(mailto).Append("\r\n"); msg.Append("MIME-Version: 1.0").Append("\r\n"); msg.Append("Content-Type: text/xml; charset=utf-8").Append("\r\n"); msg.Append("Content-Transfer-Encoding: BASE64").Append("\r\n"); // write the remoting headers IEnumerator headerenum = headers.GetEnumerator(); while (headerenum.MoveNext()) { DictionaryEntry entry = (DictionaryEntry) headerenum.Current; String key = entry.Key as String; if (key == null || key.StartsWith("__")) { continue; } msg.Append("X-REMOTING-").Append(key).Append(": "); msg.Append(entry.Value.ToString()).Append("\r\n"); } if (objectURI != null) { msg.Append("X-REMOTING-URI: ").Append(objectURI).Append("\r\n"); } msg.Append("\r\n"); MemoryStream fs = new MemoryStream(); byte[] buf = new Byte[1000]; int cnt = stream.Read(buf,0,1000); int bytecount = 0; while (cnt>0) { fs.Write(buf,0,cnt); bytecount+=cnt; cnt = stream.Read(buf,0,1000); }
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// convert the whole string to Base64 encoding String body = Convert.ToBase64String(fs.GetBuffer(),0,bytecount); // and ensure the maximum line length of 73 characters int linesNeeded = (int) Math.Ceiling(body.Length / 73);
CHAPTER 14 DEVELOPING A TRANSPORT CHANNEL
for (int i = 0;i<=linesNeeded;i++) { if (i != linesNeeded) { String line = body.Substring(i*73,73); msg.Append(line).Append("\r\n"); } else { String line = body.Substring(i*73); msg.Append(line).Append("\r\n"); } } // send the resulting message SmtpConnection con = new SmtpConnection (smtpServer); con.SendMessage(mailfrom,mailto,msg.ToString()); } This method is not called directly by the framework, but instead the class provides two other methods that are made for this purpose. The first one, named SendRequestMessage(), generates a message ID that is later returned using an out parameter and then calls SendMessage() to send the e-mail via SMTP. It next calls the POP3PollManager s RequestSent() method so that the background thread will start checking for incoming reply mails. The second method, SendReplyMessage(), takes a given message ID and sends a reply: internal static void SendRequestMessage(String mailfrom, String mailto, String smtpServer, ITransportHeaders headers, Stream request, String objectURI, out String ID) { ID = "<" + Guid.NewGuid().ToString().Replace("-","") + "@REMOTING>"; SendMessage(ID,null,mailfrom,mailto,smtpServer,headers,request,objectURI); POP3PollManager.RequestSent(); } internal static void SendResponseMessage(String mailfrom, String mailto, String smtpServer, ITransportHeaders headers, Stream response, String ID) { SendMessage(null,ID,mailfrom,mailto,smtpServer,headers,response,null); } The more complex part of mapping the underlying protocol to the .NET Remoting framework is the handling of responses. As the combination of SMTP and POP3 is asynchronous in its nature, whereas most .NET calls are executed synchronously, you have to provide a means for blocking the underlying thread until the matching response has been received. This is accomplished by the following method, which adds the waiting thread to the _waitingFor Hashtable and suspends it afterwards. Whenever a response is received (which is handled by another function running in a different thread), the response is stored in the _responses Hashtable and the thread awakened again. It then fetches the value from _responses and returns it to the caller.
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