public TimeSpan durationRequest; // Duration request
/// <summary>
/// Constructor for use at the source node
/// </summary>
public TableEntry(string msgId, OverlayRequest request, Message msg)
{
this.insertedTable = false;
this.msgId = msgId;
this.request = request;
this.msg = msg;
}
/// <summary>
/// This method is called by a ReplyTimer when it fires.
/// </summary>
/// <param name="nodeId">The nodeId of the message whose timer fired</param>
internal void ReplyTimerFired(string id)
{
if (table.ContainsKey(id))
{
// Get the table entry for this message nodeId
// Debug.Assert( table.ContainsKey(nodeId) );
TableEntry entry = (TableEntry)table[id];
// Debug.Assert( entry!=null );
OverlayRequest request = entry.request;
Debug.Assert(request != null);
// We have already retried this request enough times.
// This time we just fail the request.
// Cancel the pending timer.
// brake sending message
entry.msg.CancelSending();
// Invoke the Request's callback with a null reply,
// indicating no reply was received
// Ha transcurrido el tiempo de espera sin respuesta, enviamos un mensaje de error.
// lanzamos el error
request.Async.success = false;
request.Async.exception = new Exception(string.Format("Error en SendRequest: Se ha excedido el tiempo de espera establecido TimeOut: {0}ms", request.TimeoutMs));
entry.reply = null;
ExecuteCallback(request);
// Remove the request from the RequestReplyTable
RemoveEntry(request.Id);
}
}
/// <summary>
/// llamado cuando surge un error y el mensaje no sale de su origen
/// </summary>
/// <param name="request"></param>
public void HandleExceptionAtSource(OverlayRequest request, Exception errAtSource)
{
string id = request.Id;
TableEntry entry;
if (table.ContainsKey(id))
{
// cogemos entrada en tabla
entry = (TableEntry)table[id];
// cancel timer
localNode.CancelTimer(entry.replyTimer);
if (request.Async != null)
{
// señalamos el error
request.Async.success = false;
request.Async.exception = errAtSource;
// ejecutamos callback del usuario
ExecuteCallback(request);
// borramos de la tabla
RemoveEntry(id);
}
else
{
// lanzamos la excepción si no hay objeto async
// han usado sendmessagedirect
// borramos de la tabla
RemoveEntry(id);
throw errAtSource;
}
}
}
/// <summary>
/// Called by the overlay when a request message is being sent from the source.
/// Sets up timeouts, etc.
///
/// Llamado cuando se envia la peticion
/// </summary>
/// <param name="request">The request message</param>
public void HandleRequestAtSource(Message msg)
{
OverlayRequest request = (OverlayRequest)msg.Payload;
string id = request.Id;
// Get the current table entry (if any), or create a new one
TableEntry entry;
if (table.ContainsKey(id))
{
entry = table[id];
}
else
{
// Create a new entry and add it to the hash table
entry = new TableEntry(id, request, msg);
lock (sync)
{
table.Add(id, entry);
}
entry.insertedTable = true;
entry.insertedTime = DateTime.Now;
}
// Schedule the timer to handle retries and timeouts
ReplyTimer timer = new ReplyTimer(request, request.TimeoutMs);
entry.replyTimer = timer;
localNode.SetTimer(timer);
}
public RequestAsyncResult(OverlayRequest request, AsyncCallback callback, object state)
{
asyncWaitHandle = new ManualResetEvent(false);
this.Request = request;
this.callback = callback;
this.state = state;
}
/// <summary>
/// conseguir la petición de una conversación
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public OverlayRequest GetRequest(string key)
{
OverlayRequest ret = null;
TableEntry entry = (TableEntry)table[key];
if (entry != null)
{
ret = entry.request;
}
return(ret);
}
//**********************************************************************************************
// ArrivedAtDestination
//**********************************************************************************************
/// <summary>
/// Called by the overlay when ArrivedAtDestination is about to be called for a request message.
/// Sets up state to avoid calling ArrivedAtDestination multiple times.
///
/// Cuando llega al destino es llamado
/// </summary>
public void HandleArrivedAtDestination(Message msg)
{
OverlayRequest request = msg.Payload as OverlayRequest;
try
{
// Get the request's nodeId
string id = request.Id;
// Look up the request's nodeId in the table.
// Note: Normally, an entry for this nodeId will already exist.
// But, sometimes during CLB routing, ArrivedAtDestination() is called
// without ever calling CheckContinueRouting() at that node.
TableEntry entry;
if (table.ContainsKey(id))
{
// Get the entry for this nodeId
entry = (TableEntry)table[id];
}
else
{
// Create a new entry for this nodeId and add it to the table
entry = new TableEntry(id, request, msg);
lock (sync)
{
table.Add(id, entry);
}
}
// Start a timer to garbage-collect this table entry
if (entry.gcTimer == null)
{
EntryGCTimer timer = new EntryGCTimer(request);
entry.gcTimer = timer;
localNode.SetTimer(timer);
}
// If ArrivedAtDestination has not already been called at this node, call it
if (!entry.adCalled)
{
entry.adCalled = true;
request.ArrivedAtDestination(localNode, msg);
}
}
catch (Exception err)
{
// mandamos este error al nodo que hizo la petición
OverlayError replyErrMsg = new OverlayError(request, err);
localNode.SendReply(replyErrMsg, msg.Source);
throw err;
}
}
/// <summary>
/// Called by a reply message when it arrives at the original source.
/// </summary>
/// <param name="reply"></param>
public void ReceivedReply(OverlayReply reply)
{
// Get the request's nodeId
string id = reply.RequestId;
// Look up the request's nodeId in the table.
if (table.ContainsKey(id))
{
// Get the entry for this nodeId
TableEntry entry = (TableEntry)table[id];
if (entry.request == null)
{
// If there is no request message, this node is not the source
}
else
{
OverlayRequest request = entry.request;
// calculate duration
entry.durationRequest = DateTime.Now.Subtract(entry.insertedTime);
// Cancel the pending timer.
localNode.CancelTimer(entry.replyTimer);
if (request.Async != null)
{
// todo realizado adecuadamente
request.Async.success = true;
// comprobamos que nos hayan enviado un error
if (reply is OverlayError)
{
OverlayError overlayErr = (OverlayError)reply;
request.Async.success = false;
request.Async.exception = overlayErr.GetException();
}
else
{
request.Async.Reply = reply;
}
// ejecutamos el callback
ExecuteCallback(request);
}
// Remove the entry from the table
RemoveEntry(id);
}
}
}
/// <summary>
/// se encarga de lanzar el callback. Tiene en cuenta el tipo de destino
/// </summary>
/// <param name="Callback"></param>
internal void ExecuteCallback(OverlayRequest request)
{
// liberamos el ManualResetEvent
((ManualResetEvent)request.Async.AsyncWaitHandle).Set();
// llamamos al callback de SendRequest si existe
if (request.Async.Callback != null)
{
if (request.Async.Callback.Target is System.Windows.Forms.Control)
{
System.Windows.Forms.Control targetControl =
(System.Windows.Forms.Control)request.Async.Callback.Target;
IAsyncResult ar = targetControl.BeginInvoke(request.Async.Callback,
new object[] { request.Async });
}
else
{
request.Async.Callback(request.Async);
}
}
}
public OverlayReply(OverlayRequest request)
{
RequestId = request.Id;
}
/// <summary>
/// Constructor. Determine the GC interval and record the message nodeId.
/// </summary>
public EntryGCTimer(OverlayRequest request)
: base(TTL_FACTOR * request.TimeoutMs)
{
this.msgId = request.Id;
}
public ReplyTimer(OverlayRequest request, long periodMs)
: base(periodMs)
{
this.request = request;
}
public OverlayError(OverlayRequest request, Exception exception)
: base(request)
{
this.request = request;
this.exception = exception;
}