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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__