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+/*
+ * libjingle
+ * Copyright 2004--2005, Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice, 
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products 
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef TALK_BASE_VIRTUALSOCKETSERVER_H__
+#define TALK_BASE_VIRTUALSOCKETSERVER_H__
+
+#include <cassert>
+#include <deque>
+#include <map>
+
+#include "talk/base/messagequeue.h"
+#include "talk/base/socketserver.h"
+
+namespace talk_base {
+
+class VirtualSocket;
+	
+// Simulates a network in the same manner as a loopback interface.  The
+// interface can create as many addresses as you want.  All of the sockets
+// created by this network will be able to communicate with one another.
+class VirtualSocketServer : public SocketServer, public MessageHandler {
+public:
+  VirtualSocketServer();
+  virtual ~VirtualSocketServer();
+
+  // Returns a new IP not used before in this network.
+  uint32 GetNextIP();
+
+  // Limits the network bandwidth (maximum bytes per second).  Zero means that
+  // all sends occur instantly.
+  uint32 bandwidth() { return bandwidth_; }
+  void set_bandwidth(uint32 bandwidth) { bandwidth_ = bandwidth; }
+
+  // Limits the total size of packets that will be kept in the send queue,
+  // waiting for their turn to be written to the network  Defaults to 64 KB.
+  uint32 queue_capacity() { return queue_capacity_; }
+  void set_queue_capacity(uint32 queue_capacity) {
+    queue_capacity_ = queue_capacity;
+  }
+
+  // Controls the (transit) delay for packets sent in the network.  This does
+  // not inclue the time required to sit in the send queue.  Both of these
+  // values are measured in milliseconds.
+  uint32 delay_mean() { return delay_mean_; }
+  uint32 delay_stddev() { return delay_stddev_; }
+  void set_delay_mean(uint32 delay_mean) { delay_mean_ = delay_mean; }
+  void set_delay_stddev(uint32 delay_stddev) {
+    delay_stddev_ = delay_stddev;
+  }
+
+  // If the (transit) delay parameters are modified, this method should be
+  // called to recompute the new distribution.
+  void UpdateDelayDistribution();
+
+  // Controls the (uniform) probability that any sent packet is dropped.  This
+  // is separate from calculations to drop based on queue size.
+  double drop_probability() { return drop_prob_; }
+  void set_drop_probability(double drop_prob) {
+    assert((0 <= drop_prob) && (drop_prob <= 1));
+    drop_prob_ = drop_prob;
+  }
+
+  // SocketFactory:
+  virtual Socket* CreateSocket(int type);
+  virtual AsyncSocket* CreateAsyncSocket(int type);
+
+  // SocketServer:
+  virtual bool Wait(int cms, bool process_io);
+  virtual void WakeUp();
+
+  // Used to send internal wake-up messages.
+  virtual void OnMessage(Message* msg);
+
+  typedef std::pair<double,double> Point;
+  typedef std::vector<Point> Function;
+
+private:
+  friend class VirtualSocket;
+
+  typedef std::map<SocketAddress, VirtualSocket*> AddressMap;
+
+  MessageQueue* msg_queue_;
+  bool fWait_;
+  uint32 wait_version_;
+  uint32 next_ip_;
+  uint16 next_port_;
+  AddressMap* bindings_;
+
+  uint32 bandwidth_;
+  uint32 queue_capacity_;
+  uint32 delay_mean_;
+  uint32 delay_stddev_;
+  Function* delay_dist_;
+  CriticalSection delay_crit_;
+
+  double drop_prob_;
+
+  VirtualSocket* CreateSocketInternal(int type);
+
+  // Attempts to bind the given socket to the given (non-zero) address.
+  int Bind(const SocketAddress& addr, VirtualSocket* socket);
+
+  // Binds the given socket to the given (non-zero) IP on an unused port.
+  int Bind(VirtualSocket* socket, SocketAddress* addr);
+
+  // Removes the binding for the given socket.
+  int Unbind(const SocketAddress& addr, VirtualSocket* socket);
+
+  // Sends the given packet to the socket at the given address (if one exists).
+  int Send(VirtualSocket* socket, const void *pv, size_t cb,
+      const SocketAddress& local_addr, const SocketAddress& remote_addr);
+
+  // Computes the number of milliseconds required to send a packet of this size.
+  uint32 SendDelay(uint32 size);
+
+  // Returns the probability density function for the transit delay.
+  Function* GetDelayDistribution();
+
+  // Returns a random transit delay chosen from the appropriate distribution.
+  uint32 GetRandomTransitDelay();
+
+  // Basic operations on functions.  Those that return a function also take
+  // ownership of the function given (and hence, may modify or delete it).
+  Function* Accumulate(Function* f);
+  Function* Invert(Function* f);
+  Function* Resample(Function* f, double x1, double x2);
+  double Evaluate(Function* f, double x);
+};
+
+} // namespace talk_base
+
+#endif // TALK_BASE_VIRTUALSOCKETSERVER_H__