/// <summary>
/// Returns existing flow if exists, otherwise new created flow.
/// </summary>
/// <param name="isServer">Specifies if created flow is server or client flow. This has effect only if flow is created.</param>
/// <param name="localEP">Local end point.</param>
/// <param name="remoteEP">Remote end point.</param>
/// <param name="transport">SIP transport.</param>
/// <returns>Returns existing flow if exists, otherwise new created flow.</returns>
/// <exception cref="ArgumentNullException">Is raised when <b>localEP</b>,<b>remoteEP</b> or <b>transport</b> is null reference.</exception>
/// <exception cref="ArgumentException">Is raised when any of the arguments has invalid value.</exception>
internal SIP_Flow GetOrCreateFlow(bool isServer,IPEndPoint localEP,IPEndPoint remoteEP,string transport)
{
if(localEP == null){
throw new ArgumentNullException("localEP");
}
if(remoteEP == null){
throw new ArgumentNullException("remoteEP");
}
if(transport == null){
throw new ArgumentNullException("transport");
}
string flowID = localEP.ToString() + "-" + remoteEP.ToString() + "-" + transport.ToString();
lock(m_pLock){
SIP_Flow flow = null;
if(m_pFlows.TryGetValue(flowID,out flow)){
return flow;
}
else{
flow = new SIP_Flow(m_pOwner.Stack,isServer,localEP,remoteEP,transport);
m_pFlows.Add(flow.ID,flow);
flow.IsDisposing += new EventHandler(delegate(object s,EventArgs e){
lock(m_pLock){
m_pFlows.Remove(flowID);
}
});
flow.Start();
return flow;
}
}
}
/// <summary>
/// Creates new flow from TCP server session.
/// </summary>
/// <param name="session">TCP server session.</param>
/// <returns>Returns created flow.</returns>
/// <exception cref="ArgumentNullException">Is raised when <b>session</b> is null reference.</exception>
internal SIP_Flow CreateFromSession(TCP_ServerSession session)
{
if(session == null){
throw new ArgumentNullException("session");
}
string flowID = session.LocalEndPoint.ToString() + "-" + session.RemoteEndPoint.ToString() + "-" + (session.IsSecureConnection ? SIP_Transport.TLS : SIP_Transport.TCP);
lock(m_pLock){
SIP_Flow flow = new SIP_Flow(m_pOwner.Stack,session);
m_pFlows.Add(flowID,flow);
flow.IsDisposing += new EventHandler(delegate(object s,EventArgs e){
lock(m_pLock){
m_pFlows.Remove(flowID);
}
});
flow.Start();
return flow;
}
}
