Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / ManagedLibraries / Remoting / Channels / CORE / SocketCache.cs / 1305376 / SocketCache.cs
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
//==========================================================================
// File: SocketCache.cs
//
// Summary: Cache for client sockets.
//
//=========================================================================
using System;
using System.Collections;
using System.Net;
using System.Net.Sockets;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Threading;
namespace System.Runtime.Remoting.Channels
{
// Delegate to method that will fabricate the appropriate socket handler
internal delegate SocketHandler SocketHandlerFactory(Socket socket,
SocketCache socketCache,
String machineAndPort);
// Used to cache client connections to a single port on a server
internal class RemoteConnection
{
private static char[] colonSep = new char[]{':'};
private CachedSocketList _cachedSocketList;
// reference back to the socket cache
private SocketCache _socketCache;
// remote endpoint data
private String _machineAndPort;
private IPAddress[] _addressList;
private int _port;
private EndPoint _lkgIPEndPoint;
private bool connectIPv6 = false;
private Uri _uri;
internal RemoteConnection(SocketCache socketCache, String machineAndPort)
{
_socketCache = socketCache;
_cachedSocketList = new CachedSocketList(socketCache.SocketTimeout,
socketCache.CachePolicy);
// parse "machinename:port", add a dummy scheme to get uri parsing
_uri = new Uri("dummy://" + machineAndPort);
_port = _uri.Port;
_machineAndPort = machineAndPort;
} // RemoteConnection
internal SocketHandler GetSocket()
{
// try the cached socket list
SocketHandler socketHandler = _cachedSocketList.GetSocket();
if (socketHandler != null)
return socketHandler;
// Otherwise, we'll just create a new one.
return CreateNewSocket();
} // GetSocket
internal void ReleaseSocket(SocketHandler socket)
{
socket.ReleaseControl();
_cachedSocketList.ReturnSocket(socket);
} // ReleaseSocket
private bool HasIPv6Address(IPAddress[] addressList)
{
foreach (IPAddress address in addressList)
{
if (address.AddressFamily == AddressFamily.InterNetworkV6)
return true;
}
return false;
}
private void DisableNagleDelays(Socket socket)
{
// disable nagle delays
socket.SetSocketOption(SocketOptionLevel.Tcp,
SocketOptionName.NoDelay,
1);
}
private SocketHandler CreateNewSocket()
{
//
// We should not cache the DNS result
//
_addressList = Dns.GetHostAddresses(_uri.Host);
connectIPv6 = Socket.OSSupportsIPv6 && HasIPv6Address(_addressList);
// If there is only one entry in the list, just use that
// we will fail if the connect on it fails
if (_addressList.Length == 1)
return CreateNewSocket(new IPEndPoint(_addressList[0], _port));
// If LKG is set try using that
if (_lkgIPEndPoint != null)
{
try{
return CreateNewSocket(_lkgIPEndPoint);
}
catch (Exception) {
// Since this fail null out LKG
_lkgIPEndPoint = null;
}
}
// If IPv6 is enabled try connecting to IP addresses
if (connectIPv6)
{
try{
return CreateNewSocket(AddressFamily.InterNetworkV6);
}catch (Exception) {}
}
// If everything fails try ipv4 addresses
return CreateNewSocket(AddressFamily.InterNetwork);
}
private SocketHandler CreateNewSocket(EndPoint ipEndPoint)
{
Socket socket = new Socket(ipEndPoint.AddressFamily,
SocketType.Stream,
ProtocolType.Tcp);
DisableNagleDelays(socket);
InternalRemotingServices.RemotingTrace("RemoteConnection::CreateNewSocket: connecting new socket :: " + ipEndPoint);
socket.Connect(ipEndPoint);
_lkgIPEndPoint = socket.RemoteEndPoint;
return _socketCache.CreateSocketHandler(socket, _machineAndPort);
} // CreateNewSocket
private SocketHandler CreateNewSocket(AddressFamily family)
{
Socket socket = new Socket(family,
SocketType.Stream,
ProtocolType.Tcp);
DisableNagleDelays(socket);
socket.Connect(_addressList, _port);
_lkgIPEndPoint = socket.RemoteEndPoint;
return _socketCache.CreateSocketHandler(socket, _machineAndPort);
} // CreateNewSocket
internal void TimeoutSockets(DateTime currentTime)
{
_cachedSocketList.TimeoutSockets(currentTime, _socketCache.SocketTimeout);
} // TimeoutSockets
} // class RemoteConnection
internal class CachedSocket
{
private SocketHandler _socket;
private DateTime _socketLastUsed;
private CachedSocket _next;
internal CachedSocket(SocketHandler socket, CachedSocket next)
{
_socket = socket;
_socketLastUsed = DateTime.UtcNow;
_next = next;
} // CachedSocket
internal SocketHandler Handler { get { return _socket; } }
internal DateTime LastUsed { get { return _socketLastUsed; } }
internal CachedSocket Next
{
get { return _next; }
set { _next = value; }
}
} // class CachedSocket
internal class CachedSocketList
{
private int _socketCount;
private TimeSpan _socketLifetime;
private SocketCachePolicy _socketCachePolicy;
private CachedSocket _socketList; // linked list
internal CachedSocketList(TimeSpan socketLifetime, SocketCachePolicy socketCachePolicy)
{
_socketCount = 0;
_socketLifetime = socketLifetime;
_socketCachePolicy = socketCachePolicy;
_socketList = null;
} // CachedSocketList
internal SocketHandler GetSocket()
{
if (_socketCount == 0)
return null;
lock (this)
{
if (_socketList != null)
{
SocketHandler socket = _socketList.Handler;
_socketList = _socketList.Next;
bool bRes = socket.----ForControl();
// We should always have control since there shouldn't
// be contention here.
InternalRemotingServices.RemotingAssert(bRes, "someone else has the socket?");
_socketCount--;
return socket;
}
}
return null;
} // GetSocket
internal void ReturnSocket(SocketHandler socket)
{
TimeSpan socketActiveTime = DateTime.UtcNow - socket.CreationTime;
bool closeSocket = false;
lock (this)
{
// Check if socket active time has exceeded the lifetime
// If it has just close the Socket
if (_socketCachePolicy != SocketCachePolicy.AbsoluteTimeout ||
socketActiveTime < _socketLifetime)
{
// Ignore duplicate entries for the same socket handler
for (CachedSocket curr = _socketList; curr != null; curr = curr.Next){
if (socket == curr.Handler)
return;
}
_socketList = new CachedSocket(socket, _socketList);
_socketCount++;
}
else
{
closeSocket = true;
}
}
if(closeSocket)
{
socket.Close();
}
} // ReturnSocket
internal void TimeoutSockets(DateTime currentTime, TimeSpan socketLifetime)
{
lock (this)
{
CachedSocket prev = null;
CachedSocket curr = _socketList;
while (curr != null)
{
// see if it's lifetime has expired
if ((_socketCachePolicy == SocketCachePolicy.AbsoluteTimeout && // This is for absolute
(currentTime - curr.Handler.CreationTime) > socketLifetime) ||
(currentTime - curr.LastUsed) > socketLifetime) // This is relative behaviour
{
curr.Handler.Close();
// remove current cached socket from list
if (prev == null)
{
// it's the first item, so update _socketList
_socketList = curr.Next;
curr = _socketList;
}
else
{
// remove current item from the list
curr = curr.Next;
prev.Next = curr;
}
// decrement socket count
_socketCount--;
}
else
{
prev = curr;
curr = curr.Next;
}
}
}
} // TimeoutSockets
} // class CachedSocketList
internal class SocketCache
{
// collection of RemoteConnection's.
private static Hashtable _connections = new Hashtable();
private SocketHandlerFactory _handlerFactory;
// socket timeout data
private static RegisteredWaitHandle _registeredWaitHandle;
private static WaitOrTimerCallback _socketTimeoutDelegate;
private static AutoResetEvent _socketTimeoutWaitHandle;
private static TimeSpan _socketTimeoutPollTime = TimeSpan.FromSeconds(10);
private SocketCachePolicy _socketCachePolicy;
private TimeSpan _socketTimeout;
private int _receiveTimeout = 0;
static SocketCache()
{
InitializeSocketTimeoutHandler();
}
internal SocketCache(SocketHandlerFactory handlerFactory, SocketCachePolicy socketCachePolicy,
TimeSpan socketTimeout)
{
_handlerFactory = handlerFactory;
_socketCachePolicy = socketCachePolicy;
_socketTimeout = socketTimeout;
} // SocketCache
internal TimeSpan SocketTimeout { get { return _socketTimeout; } set { _socketTimeout = value;} }
internal int ReceiveTimeout { get { return _receiveTimeout; } set { _receiveTimeout = value;} }
internal SocketCachePolicy CachePolicy { get { return _socketCachePolicy; } set { _socketCachePolicy = value;}}
private static void InitializeSocketTimeoutHandler()
{
_socketTimeoutDelegate = new WaitOrTimerCallback(TimeoutSockets);
_socketTimeoutWaitHandle = new AutoResetEvent(false);
_registeredWaitHandle =
ThreadPool.UnsafeRegisterWaitForSingleObject(
_socketTimeoutWaitHandle,
_socketTimeoutDelegate,
"TcpChannelSocketTimeout",
_socketTimeoutPollTime,
true); // execute only once
} // InitializeSocketTimeoutHandler
private static void TimeoutSockets(Object state, Boolean wasSignalled)
{
DateTime currentTime = DateTime.UtcNow;
lock (_connections)
{
foreach (DictionaryEntry entry in _connections)
{
RemoteConnection connection = (RemoteConnection)entry.Value;
connection.TimeoutSockets(currentTime);
}
}
_registeredWaitHandle.Unregister(null);
_registeredWaitHandle =
ThreadPool.UnsafeRegisterWaitForSingleObject(
_socketTimeoutWaitHandle,
_socketTimeoutDelegate,
"TcpChannelSocketTimeout",
_socketTimeoutPollTime,
true); // execute only once
} // TimeoutSockets
internal SocketHandler CreateSocketHandler(Socket socket, String machineAndPort)
{
socket.ReceiveTimeout = _receiveTimeout;
return _handlerFactory(socket, this, machineAndPort);
}
// The key is expected to of the form "machinename:port"
public SocketHandler GetSocket(String machinePortAndSid, bool openNew)
{
RemoteConnection connection = (RemoteConnection)_connections[machinePortAndSid];
if (openNew || connection == null)
{
connection = new RemoteConnection(this, machinePortAndSid);
// doesn't matter if different RemoteConnection's get written at
// the same time (GC will come along and close them).
lock (_connections)
{
_connections[machinePortAndSid] = connection;
}
}
return connection.GetSocket();
} // GetSocket
public void ReleaseSocket(String machinePortAndSid, SocketHandler socket)
{
RemoteConnection connection = (RemoteConnection)_connections[machinePortAndSid];
if (connection != null)
{
connection.ReleaseSocket(socket);
}
else
{
// there should have been a connection, so let's just close
// this socket.
socket.Close();
}
} // ReleaseSocket
} // SocketCache
} // namespace System.Runtime.Remoting.Channels
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
//==========================================================================
// File: SocketCache.cs
//
// Summary: Cache for client sockets.
//
//=========================================================================
using System;
using System.Collections;
using System.Net;
using System.Net.Sockets;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Threading;
namespace System.Runtime.Remoting.Channels
{
// Delegate to method that will fabricate the appropriate socket handler
internal delegate SocketHandler SocketHandlerFactory(Socket socket,
SocketCache socketCache,
String machineAndPort);
// Used to cache client connections to a single port on a server
internal class RemoteConnection
{
private static char[] colonSep = new char[]{':'};
private CachedSocketList _cachedSocketList;
// reference back to the socket cache
private SocketCache _socketCache;
// remote endpoint data
private String _machineAndPort;
private IPAddress[] _addressList;
private int _port;
private EndPoint _lkgIPEndPoint;
private bool connectIPv6 = false;
private Uri _uri;
internal RemoteConnection(SocketCache socketCache, String machineAndPort)
{
_socketCache = socketCache;
_cachedSocketList = new CachedSocketList(socketCache.SocketTimeout,
socketCache.CachePolicy);
// parse "machinename:port", add a dummy scheme to get uri parsing
_uri = new Uri("dummy://" + machineAndPort);
_port = _uri.Port;
_machineAndPort = machineAndPort;
} // RemoteConnection
internal SocketHandler GetSocket()
{
// try the cached socket list
SocketHandler socketHandler = _cachedSocketList.GetSocket();
if (socketHandler != null)
return socketHandler;
// Otherwise, we'll just create a new one.
return CreateNewSocket();
} // GetSocket
internal void ReleaseSocket(SocketHandler socket)
{
socket.ReleaseControl();
_cachedSocketList.ReturnSocket(socket);
} // ReleaseSocket
private bool HasIPv6Address(IPAddress[] addressList)
{
foreach (IPAddress address in addressList)
{
if (address.AddressFamily == AddressFamily.InterNetworkV6)
return true;
}
return false;
}
private void DisableNagleDelays(Socket socket)
{
// disable nagle delays
socket.SetSocketOption(SocketOptionLevel.Tcp,
SocketOptionName.NoDelay,
1);
}
private SocketHandler CreateNewSocket()
{
//
// We should not cache the DNS result
//
_addressList = Dns.GetHostAddresses(_uri.Host);
connectIPv6 = Socket.OSSupportsIPv6 && HasIPv6Address(_addressList);
// If there is only one entry in the list, just use that
// we will fail if the connect on it fails
if (_addressList.Length == 1)
return CreateNewSocket(new IPEndPoint(_addressList[0], _port));
// If LKG is set try using that
if (_lkgIPEndPoint != null)
{
try{
return CreateNewSocket(_lkgIPEndPoint);
}
catch (Exception) {
// Since this fail null out LKG
_lkgIPEndPoint = null;
}
}
// If IPv6 is enabled try connecting to IP addresses
if (connectIPv6)
{
try{
return CreateNewSocket(AddressFamily.InterNetworkV6);
}catch (Exception) {}
}
// If everything fails try ipv4 addresses
return CreateNewSocket(AddressFamily.InterNetwork);
}
private SocketHandler CreateNewSocket(EndPoint ipEndPoint)
{
Socket socket = new Socket(ipEndPoint.AddressFamily,
SocketType.Stream,
ProtocolType.Tcp);
DisableNagleDelays(socket);
InternalRemotingServices.RemotingTrace("RemoteConnection::CreateNewSocket: connecting new socket :: " + ipEndPoint);
socket.Connect(ipEndPoint);
_lkgIPEndPoint = socket.RemoteEndPoint;
return _socketCache.CreateSocketHandler(socket, _machineAndPort);
} // CreateNewSocket
private SocketHandler CreateNewSocket(AddressFamily family)
{
Socket socket = new Socket(family,
SocketType.Stream,
ProtocolType.Tcp);
DisableNagleDelays(socket);
socket.Connect(_addressList, _port);
_lkgIPEndPoint = socket.RemoteEndPoint;
return _socketCache.CreateSocketHandler(socket, _machineAndPort);
} // CreateNewSocket
internal void TimeoutSockets(DateTime currentTime)
{
_cachedSocketList.TimeoutSockets(currentTime, _socketCache.SocketTimeout);
} // TimeoutSockets
} // class RemoteConnection
internal class CachedSocket
{
private SocketHandler _socket;
private DateTime _socketLastUsed;
private CachedSocket _next;
internal CachedSocket(SocketHandler socket, CachedSocket next)
{
_socket = socket;
_socketLastUsed = DateTime.UtcNow;
_next = next;
} // CachedSocket
internal SocketHandler Handler { get { return _socket; } }
internal DateTime LastUsed { get { return _socketLastUsed; } }
internal CachedSocket Next
{
get { return _next; }
set { _next = value; }
}
} // class CachedSocket
internal class CachedSocketList
{
private int _socketCount;
private TimeSpan _socketLifetime;
private SocketCachePolicy _socketCachePolicy;
private CachedSocket _socketList; // linked list
internal CachedSocketList(TimeSpan socketLifetime, SocketCachePolicy socketCachePolicy)
{
_socketCount = 0;
_socketLifetime = socketLifetime;
_socketCachePolicy = socketCachePolicy;
_socketList = null;
} // CachedSocketList
internal SocketHandler GetSocket()
{
if (_socketCount == 0)
return null;
lock (this)
{
if (_socketList != null)
{
SocketHandler socket = _socketList.Handler;
_socketList = _socketList.Next;
bool bRes = socket.----ForControl();
// We should always have control since there shouldn't
// be contention here.
InternalRemotingServices.RemotingAssert(bRes, "someone else has the socket?");
_socketCount--;
return socket;
}
}
return null;
} // GetSocket
internal void ReturnSocket(SocketHandler socket)
{
TimeSpan socketActiveTime = DateTime.UtcNow - socket.CreationTime;
bool closeSocket = false;
lock (this)
{
// Check if socket active time has exceeded the lifetime
// If it has just close the Socket
if (_socketCachePolicy != SocketCachePolicy.AbsoluteTimeout ||
socketActiveTime < _socketLifetime)
{
// Ignore duplicate entries for the same socket handler
for (CachedSocket curr = _socketList; curr != null; curr = curr.Next){
if (socket == curr.Handler)
return;
}
_socketList = new CachedSocket(socket, _socketList);
_socketCount++;
}
else
{
closeSocket = true;
}
}
if(closeSocket)
{
socket.Close();
}
} // ReturnSocket
internal void TimeoutSockets(DateTime currentTime, TimeSpan socketLifetime)
{
lock (this)
{
CachedSocket prev = null;
CachedSocket curr = _socketList;
while (curr != null)
{
// see if it's lifetime has expired
if ((_socketCachePolicy == SocketCachePolicy.AbsoluteTimeout && // This is for absolute
(currentTime - curr.Handler.CreationTime) > socketLifetime) ||
(currentTime - curr.LastUsed) > socketLifetime) // This is relative behaviour
{
curr.Handler.Close();
// remove current cached socket from list
if (prev == null)
{
// it's the first item, so update _socketList
_socketList = curr.Next;
curr = _socketList;
}
else
{
// remove current item from the list
curr = curr.Next;
prev.Next = curr;
}
// decrement socket count
_socketCount--;
}
else
{
prev = curr;
curr = curr.Next;
}
}
}
} // TimeoutSockets
} // class CachedSocketList
internal class SocketCache
{
// collection of RemoteConnection's.
private static Hashtable _connections = new Hashtable();
private SocketHandlerFactory _handlerFactory;
// socket timeout data
private static RegisteredWaitHandle _registeredWaitHandle;
private static WaitOrTimerCallback _socketTimeoutDelegate;
private static AutoResetEvent _socketTimeoutWaitHandle;
private static TimeSpan _socketTimeoutPollTime = TimeSpan.FromSeconds(10);
private SocketCachePolicy _socketCachePolicy;
private TimeSpan _socketTimeout;
private int _receiveTimeout = 0;
static SocketCache()
{
InitializeSocketTimeoutHandler();
}
internal SocketCache(SocketHandlerFactory handlerFactory, SocketCachePolicy socketCachePolicy,
TimeSpan socketTimeout)
{
_handlerFactory = handlerFactory;
_socketCachePolicy = socketCachePolicy;
_socketTimeout = socketTimeout;
} // SocketCache
internal TimeSpan SocketTimeout { get { return _socketTimeout; } set { _socketTimeout = value;} }
internal int ReceiveTimeout { get { return _receiveTimeout; } set { _receiveTimeout = value;} }
internal SocketCachePolicy CachePolicy { get { return _socketCachePolicy; } set { _socketCachePolicy = value;}}
private static void InitializeSocketTimeoutHandler()
{
_socketTimeoutDelegate = new WaitOrTimerCallback(TimeoutSockets);
_socketTimeoutWaitHandle = new AutoResetEvent(false);
_registeredWaitHandle =
ThreadPool.UnsafeRegisterWaitForSingleObject(
_socketTimeoutWaitHandle,
_socketTimeoutDelegate,
"TcpChannelSocketTimeout",
_socketTimeoutPollTime,
true); // execute only once
} // InitializeSocketTimeoutHandler
private static void TimeoutSockets(Object state, Boolean wasSignalled)
{
DateTime currentTime = DateTime.UtcNow;
lock (_connections)
{
foreach (DictionaryEntry entry in _connections)
{
RemoteConnection connection = (RemoteConnection)entry.Value;
connection.TimeoutSockets(currentTime);
}
}
_registeredWaitHandle.Unregister(null);
_registeredWaitHandle =
ThreadPool.UnsafeRegisterWaitForSingleObject(
_socketTimeoutWaitHandle,
_socketTimeoutDelegate,
"TcpChannelSocketTimeout",
_socketTimeoutPollTime,
true); // execute only once
} // TimeoutSockets
internal SocketHandler CreateSocketHandler(Socket socket, String machineAndPort)
{
socket.ReceiveTimeout = _receiveTimeout;
return _handlerFactory(socket, this, machineAndPort);
}
// The key is expected to of the form "machinename:port"
public SocketHandler GetSocket(String machinePortAndSid, bool openNew)
{
RemoteConnection connection = (RemoteConnection)_connections[machinePortAndSid];
if (openNew || connection == null)
{
connection = new RemoteConnection(this, machinePortAndSid);
// doesn't matter if different RemoteConnection's get written at
// the same time (GC will come along and close them).
lock (_connections)
{
_connections[machinePortAndSid] = connection;
}
}
return connection.GetSocket();
} // GetSocket
public void ReleaseSocket(String machinePortAndSid, SocketHandler socket)
{
RemoteConnection connection = (RemoteConnection)_connections[machinePortAndSid];
if (connection != null)
{
connection.ReleaseSocket(socket);
}
else
{
// there should have been a connection, so let's just close
// this socket.
socket.Close();
}
} // ReleaseSocket
} // SocketCache
} // namespace System.Runtime.Remoting.Channels
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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