internal override void NotifySessionConnected(bool result, object context)
{
if (result == true)
{
var session = (LinkSession)context;
using (new WriteLock(rwlock))
{
this.session = session;
}
}
base.NotifySessionConnected(result, context);
}
internal void OnSessionResp(LinkSession session, SessionResp e)
{
LinkSession currentSession = Session;
string sessionToken = null;
if (!Object.ReferenceEquals(currentSession, null))
{
sessionToken = currentSession.Token;
}
// Save the session token from the server.
session.Token = e.Token;
Log.Trace("{0} {1} session token {2}",
Name, session.InternalHandle, e.Token);
if (!String.IsNullOrEmpty(sessionToken))
{
if (sessionToken.Equals(e.Token))
{
// Recovered from instant disconnection.
session.InheritFrom(this.session);
session.Send(new SessionAck {
_Transform = false,
Recovered = true
});
OnLinkSessionRecoveredInternal(session.Handle, session, e.Retransmission);
return;
}
OnLinkSessionDisconnectedInternal(currentSession.Handle, currentSession);
}
session.Send(new SessionAck { _Transform = false });
OnSessionSetup(session);
}
internal override void OnInstantDisconnect(LinkSession session)
{
LinkSession currentSession = Session;
if (!Object.ReferenceEquals(session, currentSession))
{
Log.Warn("{0} gave up session recovery {1}", Name, session.Handle);
return;
}
recovering = true;
Reconnect();
}
/// <summary>
/// Called by a derived link class on a successful connect.
/// </summary>
protected virtual void OnConnectInternal(LinkSession session)
{
session.Polarity = true;
if (SessionRecoveryEnabled)
{
SendSessionReq(session);
}
else
{
OnSessionSetup(session);
}
}
internal override void OnInstantDisconnect(LinkSession session)
{
bool flag;
// Ensure that the specified session is recoverable.
LinkSession existing = null;
lock (recoverable)
{
flag = recoverable.TryGetValue(session.Token, out existing);
}
if (!flag)
{
Log.Info("{0} {1} unrecoverable session", Name, session.Handle);
OnLinkSessionDisconnectedInternal(session.Handle, session);
return;
}
else if (!Object.ReferenceEquals(session, existing))
{
Log.Warn("{0} {1} gave up session recovery", Name, session.Handle);
return;
}
existing = null;
using (new ReadLock(rwlock))
{
sessions.TryGetValue(session.Handle, out existing);
}
if (!Object.ReferenceEquals(session, existing))
{
Log.Warn("{0} {1} gave up session recovery", Name, session.Handle);
return;
}
var e = new TimeoutEvent { Key = session };
Binder.Token binderToken = this.Flow.Subscribe(e, OnSessionRecoveryTimeout);
TimeFlow.Default.Reserve(e, SessionRecoveryTimeout);
lock (recoveryTokens)
{
recoveryTokens[session.Handle] = binderToken;
}
Log.Trace("{0} {1} started recovery timer", Name, session.Handle);
}
internal void OnSessionReq(LinkSession session, SessionReq e)
{
string clientToken = e.Token;
bool flag = false;
if (!String.IsNullOrEmpty(clientToken))
{
int incomingRetransmission = 0;
int outgoingRetransmission = 0;
LinkSession existing;
lock (recoverable)
{
flag = recoverable.TryGetValue(clientToken, out existing);
}
if (flag)
{
Log.Trace("{0} {1} rxC={2} txC={3} rxS={4} txS={5} txSc={6}",
Name, existing.Handle, e.RxCounter, e.TxCounter,
existing.RxCounter, existing.TxCounter, existing.TxCompleted);
if (e.RxCounter < existing.TxCounter)
{
outgoingRetransmission = (int)(existing.TxCounter - e.RxCounter);
if (outgoingRetransmission > existing.TxBuffered)
{
flag = false;
}
}
if (e.TxCounter > existing.RxCounter)
{
incomingRetransmission = (int)(e.TxCounter - existing.RxCounter);
if (incomingRetransmission > e.TxBuffered)
{
flag = false;
}
}
if (!flag)
{
Log.Warn("{0} {1} gave up session recovery",
Name, existing.Handle);
OnLinkSessionDisconnectedInternal(existing.Handle, existing);
}
}
if (flag)
{
int handle;
lock (existing.SyncRoot)
{
handle = existing.Handle;
}
if (handle != 0)
{
lock (existing.SyncRoot)
{
CancelRecoveryTimer(handle);
session.InheritFrom(existing);
}
session.Send(new SessionResp {
_Transform = false,
Token = session.Token,
Retransmission = incomingRetransmission
});
OnLinkSessionRecoveredInternal(handle, session, outgoingRetransmission);
return;
}
}
}
// Issue a new session token for the given session.
session.Token = Guid.NewGuid().ToString("N");
Log.Debug("{0} {1} issued session token {2}",
Name, session.InternalHandle, session.Token);
lock (recoverable)
{
recoverable[session.Token] = session;
}
session.Send(new SessionResp {
_Transform = false,
Token = session.Token
});
}
public void Close(bool disconnect)
{
Dispose();
if (LinkSession != null)
{
if (disconnect)
{
LinkSession.Close();
}
else
{
LinkSession = null;
}
}
}
internal void InheritFrom(LinkSession oldSession)
{
lock (syncRoot)
{
handle = oldSession.Handle;
Token = oldSession.Token;
Log.Debug("{0} {1} session inheritance {2}",
link.Name, handle, Token);
BufferTransform = oldSession.BufferTransform;
rxTransformReady = oldSession.rxTransformReady;
txTransformReady = oldSession.txTransformReady;
}
}
internal Diagnostics(LinkSession owner)
{
this.owner = owner;
}
/// <summary>
/// Frees managed or unmanaged resources.
/// </summary>
protected override void Dispose(bool disposing)
{
if (disposed) { return; }
using (new WriteLock(rwlock))
{
if (session != null)
{
session.Close();
session = null;
}
}
base.Dispose(disposing);
}
private void SendSessionReq(LinkSession session)
{
var req = new SessionReq { _Transform = false };
LinkSession currentSession = Session;
if (!Object.ReferenceEquals(currentSession, null) &&
!String.IsNullOrEmpty(currentSession.Token))
{
req.Token = currentSession.Token;
req.RxCounter = currentSession.RxCounter;
req.TxCounter = currentSession.TxCounter;
req.TxBuffered = currentSession.TxBuffered;
}
session.Send(req);
}
protected override void OnSessionRecoveredInternal(
int handle, object context, int retransmission)
{
LinkSession oldSession;
var session = (LinkSession)context;
using (new WriteLock(rwlock))
{
oldSession = this.session;
this.session = session;
}
session.TakeOver(oldSession, retransmission);
Log.Debug("{0} {1} reset session {2}",
Name, session.Handle, session.Token);
}
protected override void OnSessionDisconnectedInternal(int handle, object context)
{
using (new WriteLock(rwlock))
{
if (!Object.ReferenceEquals(session, null))
{
Log.Debug("{0} {1} cleared session {2}",
Name, session.Handle, session.Token);
session = null;
}
}
}
protected override void OnSessionConnectedInternal(bool result, object context)
{
if (result)
{
var session = (LinkSession)context;
using (new WriteLock(rwlock))
{
this.session = session;
}
Log.Debug("{0} {1} set session {2}",
Name, session.Handle, session.Token);
}
}
/// <summary>
/// <see cref="ClientLink.OnConnectInternal"/>
/// </summary>
protected override void OnConnectInternal(LinkSession session)
{
var tcpSession = (AbstractTcpSession)session;
Socket socket = tcpSession.Socket;
// Adjust socket options.
socket.NoDelay = NoDelay;
// Save the remote endpoint to reconnect.
remoteEndPoint = socket.RemoteEndPoint;
tcpSession.BeginReceive(true);
Log.Info("{0} {1} connected to {2}",
Name, tcpSession.InternalHandle, socket.RemoteEndPoint);
base.OnConnectInternal(session);
}
/// <summary>
/// <see cref="ServerLink.OnAcceptInternal"/>
/// </summary>
protected override bool OnAcceptInternal(LinkSession session)
{
var tcpSession = (AbstractTcpSession)session;
var clientSocket = tcpSession.Socket;
// Adjust client socket options.
clientSocket.NoDelay = NoDelay;
tcpSession.BeginReceive(true);
Log.Info("{0} {1} accepted from {2}",
Name, session.Handle, clientSocket.RemoteEndPoint);
return base.OnAcceptInternal(session);
}
/// <summary>
/// Called by a derived link class on a successful connect.
/// </summary>
protected virtual void OnConnectInternal(LinkSession session)
{
session.Polarity = true;
if (BufferTransform != null)
{
InitiateHandshake(session);
}
else
{
NotifySessionConnected(true, session);
}
}
public void TakeOver(LinkSession oldSession, int retransmission)
{
if (retransmission == 0)
{
lock (syncRoot)
{
lock (oldSession.syncRoot)
{
if (oldSession.buffersSending.Count != 0)
{
// Dispose them
for (int i = 0, count = oldSession.buffersSending.Count; i < count; ++i)
{
oldSession.buffersSending[i].Dispose();
}
oldSession.buffersSending.Clear();
}
if (oldSession.buffersSent.Count != 0)
{
// Dispose them
for (int i = 0, count = oldSession.buffersSent.Count; i < count; ++i)
{
oldSession.buffersSent[i].Dispose();
}
oldSession.buffersSent.Clear();
}
Log.Info("{0} {1} pre-establishment buffered {2}",
link.Name, InternalHandle, preConnectionQueue.Count);
if (preConnectionQueue.Count != 0)
{
eventsToSend.InsertRange(0, preConnectionQueue);
preConnectionQueue.Clear();
}
if (oldSession.eventsToSend.Count != 0)
{
eventsToSend.InsertRange(0, oldSession.eventsToSend);
oldSession.eventsToSend.Clear();
}
Log.Info("{0} {1} eventsToSend {2}", link.Name, InternalHandle, eventsToSend.Count);
}
connected = true;
if (txFlag || eventsToSend.Count == 0)
{
return;
}
txFlag = true;
}
BeginSend();
}
else
{
Monitor.Enter(syncRoot);
try
{
// Wait for any existing send to complete
while (txFlag)
{
Monitor.Exit(syncRoot);
Thread.Sleep(1);
Monitor.Enter(syncRoot);
}
txBufferList.Clear();
lengthToSend = 0;
buffersSending.Clear();
lock (oldSession.syncRoot)
{
List<SendBuffer> buffers1, buffers2;
if (oldSession.TxCounter == oldSession.TxCompleted)
{
buffers1 = oldSession.buffersSending;
buffers2 = oldSession.buffersSent;
}
else
{
buffers1 = oldSession.buffersSent;
buffers2 = oldSession.buffersSending;
}
int numBuffers1ToDispose = oldSession.TxBuffered - retransmission;
if (numBuffers1ToDispose > buffers1.Count)
{
numBuffers1ToDispose = buffers1.Count;
}
int numBuffers2ToDispose = buffers2.Count - retransmission;
if (numBuffers2ToDispose < 0)
{
numBuffers2ToDispose = 0;
}
int i;
for (i = 0; i < numBuffers1ToDispose; ++i)
{
buffers1[i].Dispose();
}
for (; i < buffers1.Count; ++i)
{
SendBuffer buffer = buffers1[i];
buffersSending.Add(buffer);
buffer.ListOccupiedSegments(txBufferList);
lengthToSend += buffer.Length;
}
buffers1.Clear();
for (i = 0; i < numBuffers2ToDispose; ++i)
{
buffers2[i].Dispose();
}
for (; i < buffers2.Count; ++i)
{
SendBuffer buffer = buffers2[i];
buffersSending.Add(buffer);
buffer.ListOccupiedSegments(txBufferList);
lengthToSend += buffer.Length;
}
buffers2.Clear();
Log.Info("{0} {1} pre-establishment buffered {2}",
link.Name, InternalHandle, preConnectionQueue.Count);
if (preConnectionQueue.Count != 0)
{
eventsToSend.InsertRange(0, preConnectionQueue);
preConnectionQueue.Clear();
}
if (oldSession.eventsToSend.Count != 0)
{
eventsToSend.InsertRange(0, oldSession.eventsToSend);
oldSession.eventsToSend.Clear();
}
Log.Info("{0} {1} eventsToSend {2}", link.Name, InternalHandle, eventsToSend.Count);
}
Log.Warn("{0} {1} retransmitting {2} events ({3} bytes)",
link.Name, InternalHandle, retransmission, lengthToSend);
connected = true;
txFlag = true;
}
finally
{
Monitor.Exit(syncRoot);
}
Interlocked.Add(ref txCounter, retransmission);
SendInternal();
}
oldSession = null;
retransmission = 0;
}
internal override void NotifySessionDisconnected(int handle, object context)
{
using (new WriteLock(rwlock))
{
this.session = null;
}
base.NotifySessionDisconnected(handle, context);
}
public Diagnostics(LinkSession owner)
{
this.owner = owner;
}
/// <summary>
/// Called by a derived link class on a successful accept.
/// </summary>
protected virtual bool OnAcceptInternal(LinkSession session)
{
if (BufferTransform != null)
{
InitiateHandshake(session);
}
else
{
NotifySessionConnected(true, session);
}
return true;
}
internal void OnSessionAck(LinkSession session, SessionAck e)
{
if (!e.Recovered)
{
OnSessionSetup(session);
}
}
/// <summary>
/// Called by a derived class to initiate a buffer transform handshake.
/// </summary>
protected void InitiateHandshake(LinkSession session)
{
if (Object.ReferenceEquals(BufferTransform, null))
{
return;
}
var bufferTransform = (IBufferTransform)BufferTransform.Clone();
session.BufferTransform = bufferTransform;
session.Send(new HandshakeReq {
_Transform = false,
Data = bufferTransform.InitializeHandshake()
});
}
/// <summary>
/// Called by a derived link class on a successful accept.
/// </summary>
protected virtual bool OnAcceptInternal(LinkSession session)
{
if (!SessionRecoveryEnabled)
{
OnSessionSetup(session);
}
return true;
}
protected internal void OnPreprocess(LinkSession session, Event e)
{
if (Preprocess != null)
{
Preprocess(session, e);
}
}
/// <summary>
/// <see cref="ServerLink.OnAcceptInternal"/>
/// </summary>
protected override bool OnAcceptInternal(LinkSession session)
{
var tcpSession = (AbstractTcpSession)session;
var clientSocket = tcpSession.Socket;
try
{
// Adjust client socket options.
clientSocket.NoDelay = NoDelay;
tcpSession.BeginReceive(true);
Log.Info("{0} {1} accepted from {2}",
Name, tcpSession.InternalHandle, clientSocket.RemoteEndPoint);
return base.OnAcceptInternal(session);
}
catch (ObjectDisposedException ode)
{
Log.Warn("{0} {1} accept error: {2}",
Name, tcpSession.InternalHandle, ode);
return false;
}
}
/// <summary>
/// Frees managed or unmanaged resources.
/// </summary>
protected override void Dispose(bool disposing)
{
if (disposed) { return; }
LinkSession session = null;
using (new WriteLock(rwlock))
{
if (this.session != null)
{
session = this.session;
this.session = null;
}
}
if (session != null)
{
session.Close();
}
base.Dispose(disposing);
}
