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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
using System;
using System.Net;
using System.Net.Sockets;
using log4net;
using Apache.Qpid.Buffer;
using Apache.Qpid.Client.Protocol;
namespace Apache.Qpid.Client.Transport.Socket.Blocking
{
class BlockingSocketProcessor : IConnectionCloser
{
private static readonly ILog _log = LogManager.GetLogger(typeof(BlockingSocketProcessor));
string _host;
int _port;
System.Net.Sockets.Socket _socket;
private NetworkStream _networkStream;
IByteChannel _byteChannel;
IProtocolListener _protocolListener;
public BlockingSocketProcessor(string host, int port, IProtocolListener protocolListener)
{
_host = host;
_port = port;
_protocolListener = protocolListener;
_byteChannel = new ByteChannel(this);
}
/// <summary>
/// Synchronous blocking connect.
/// </summary>
public void Connect()
{
_socket = new System.Net.Sockets.Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
/// For future note TCP Set NoDelay options may help, though with the blocking io not sure
/// The Don't linger may help with detecting disconnect but that hasn't been the case in testing.
/// _socket.SetSocketOption (SocketOptionLevel.Socket, SocketOptionName.NoDelay, 0);
/// _socket.SetSocketOption (SocketOptionLevel.Socket, SocketOptionName.DontLinger, 0);
IPHostEntry ipHostInfo = Dns.Resolve(_host); // Note: don't fix this warning. We do this for .NET 1.1 compatibility.
IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint ipe = new IPEndPoint(ipAddress, _port);
_socket.Connect(ipe);
_networkStream = new NetworkStream(_socket, true);
}
public string getLocalEndPoint()
{
return _socket.LocalEndPoint.ToString();
}
public void Write(ByteBuffer byteBuffer)
{
try
{
_networkStream.Write(byteBuffer.array(), byteBuffer.position(), byteBuffer.limit()); // FIXME
}
catch (Exception e)
{
_log.Error("Write caused exception", e);
_protocolListener.OnException(e);
// We should provide the error synchronously as we are doing blocking io.
throw e;
}
}
public ByteBuffer Read()
{
const int bufferSize = 4 * 1024; // TODO: Prevent constant allocation of buffers.
byte[] bytes = new byte[bufferSize];
int numOctets = _networkStream.Read(bytes, 0, bytes.Length);
/// Read only returns 0 if the socket has been gracefully shutdown.
/// http://msdn2.microsoft.com/en-us/library/system.net.sockets.networkstream.read(VS.71).aspx
/// We can use this to block Send so the next Read will force an exception forcing failover.
/// Otherwise we need to wait ~20 seconds for the NetworkStream/Socket code to realise that
/// the socket has been closed.
if (numOctets == 0)
{
_socket.Shutdown(SocketShutdown.Send);
_socket.Close();
}
ByteBuffer byteBuffer = ByteBuffer.wrap(bytes);
byteBuffer.limit(numOctets);
byteBuffer.flip();
return byteBuffer;
}
public void Disconnect()
{
_networkStream.Flush();
_networkStream.Close();
_socket.Close();
}
public void Close()
{
Disconnect();
}
public IByteChannel ByteChannel
{
get { return _byteChannel; }
}
}
}
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