protected virtual void SetUnderlyingStream()
{
TryDisposeUnderlyingStream();
UnderlyingStream = StreamProvider.GetStream(Position);
if (UnderlyingStream == null)
{
throw new InvalidOperationException("Failed to retrieve underlying stream");
}
}
/// <summary>
/// Open and return a new Connection.
/// </summary>
/// <returns>
/// A newly opened Connection.
/// </returns>
protected override Connection OpenConnection()
{
IAddressProvider provider = RemoteAddressProvider;
Debug.Assert(provider != null);
// Default value for Coherence is 0, which is an infinite timeout.
// Default value for .NET IAsyncResult.WaitOne infinite timeout is -1.
// So, convert the Coherence infinite value to .NET Timeout.Infinite.
Int32 cMillis = (Int32)ConnectTimeout;
cMillis = cMillis <= 0 ? Timeout.Infinite : cMillis;
// open a new connection
var addresses = new StringBuilder().Append('[');
IEnumerator enmrRedirect = null;
IEnumerator enmrSubport = null;
IPEndPoint addrNext = null;
Int32 subportNext = -1;
Exception cause = null;
for ( ; ;)
{
var connection = (TcpConnection)InstantiateConnection();
IPEndPoint addr;
Int32 subport;
if (enmrRedirect == null || addrNext == null)
{
addr = provider.NextAddress;
subport = Subport;
// reset redirection information
enmrRedirect = null;
enmrSubport = null;
}
else
{
addr = addrNext;
addrNext = enmrRedirect.MoveNext() ?
(IPEndPoint)enmrRedirect.Current : null;
subport = subportNext;
subportNext = enmrSubport.MoveNext() ?
(Int32)enmrSubport.Current : -1;
// update redirection information
connection.IsRedirect = true;
}
if (addr == null)
{
break;
}
string address = NetworkUtils.ToString(addr, subport);
if (RemoteAddressProvider is ConfigurableAddressProvider)
{
StreamProvider.RemoteAddress = ((ConfigurableAddressProvider)RemoteAddressProvider).RemoteHostAddress;
}
if (addresses.Length > 1)
{
addresses.Append(", ");
}
addresses.Append(address);
// create and configure a new client
TcpClient client = InstantiateClient();
try
{
if (enmrRedirect == null)
{
CacheFactory.Log("Connecting Socket to " + address,
CacheFactory.LogLevel.Debug);
}
else
{
CacheFactory.Log("Redirecting Socket to " + address,
CacheFactory.LogLevel.Debug);
}
IAsyncResult result = client.BeginConnect(addr.Address, addr.Port, null, null);
result.AsyncWaitHandle.WaitOne(cMillis);
if (!client.Connected)
{
CacheFactory.Log("Error connecting TcpClient to "
+ address + ": connection timeout", CacheFactory.LogLevel.Info);
NetworkUtils.Close(client);
continue;
}
CacheFactory.Log("Connected TcpClient to " + address,
CacheFactory.LogLevel.Info);
connection.Client = client;
}
catch (Exception e)
{
cause = e;
CacheFactory.Log("Error connecting TcpClient to "
+ address + ": " + e, CacheFactory.LogLevel.Info);
NetworkUtils.Close(client);
// if we aren't current redirecting, or we've tried the last redirect
// address, reject the last address supplied by the address provider
if (enmrRedirect == null || addrNext == null)
{
provider.Reject(e);
}
continue;
}
// write out subport info
if (subport != -1)
{
bool secure = connection.IsSecure;
Stream stream = connection.Stream = StreamProvider.GetStream(client);
if (secure)
{
Monitor.Enter(stream);
}
try
{
NetworkUtils.WriteSubport(stream, subport);
}
catch (Exception e)
{
CacheFactory.Log("Error connecting TcpClient to "
+ address + ": " + e, CacheFactory.LogLevel.Info);
throw new ConnectionException(e);
}
finally
{
if (secure)
{
Monitor.Exit(stream);
}
}
}
try
{
connection.Open();
}
catch (Exception e)
{
if (enmrRedirect == null && connection.IsRedirect)
{
IList list = connection.RedirectList;
// create an IPEndPoint list from from the redirect list
var listRedirect = new ArrayList(list.Count);
var listSubport = new ArrayList(list.Count);
foreach (var o in list)
{
var ao = (Object[])o;
var s = (String)ao[0];
var port32 = new Port32((Int32)ao[1]);
try
{
listRedirect.Add(new IPEndPoint(NetworkUtils.GetHostAddress(s, ConnectTimeout),
port32.Baseport));
listSubport.Add(port32.Subport);
}
catch (Exception)
{
// invalid or unresolvable address
CacheFactory.Log("Skipping unresolvable address \"" + s + "\".",
CacheFactory.LogLevel.Info);
}
}
enmrRedirect = listRedirect.GetEnumerator();
enmrSubport = listSubport.GetEnumerator();
if (enmrRedirect.MoveNext() && enmrSubport.MoveNext())
{
addrNext = (IPEndPoint)enmrRedirect.Current;
subportNext = (Int32)enmrSubport.Current;
}
else
{
addrNext = null;
subportNext = -1;
}
}
else
{
CacheFactory.Log("Error establishing a connection with " + address + ": " + e,
CacheFactory.LogLevel.Info);
// if we aren't current redirecting, or we've tried the last redirect
// address, reject the last address supplied by the address provider
if (enmrRedirect == null || addrNext == null)
{
provider.Reject(e);
}
}
continue;
}
provider.Accept();
return(connection);
}
addresses.Append(']');
String message = "could not establish a connection "
+ "to one of the following addresses: " + addresses
+ "; make sure the \"remote-addresses\" configuration "
+ "element contains an address and port of a running "
+ "TcpAcceptor";
throw cause == null ? new ConnectionException(message)
: new ConnectionException(message, cause);
}
