Implement an event-based simulator for QuicConnection

net/quic/core/congestion_control/simulation/actor.h

+#ifndef NET_QUIC_CORE_CONGESTION_CONTROL_SIMULATION_ACTOR_H_

[Ryan Hamilton, 2016/09/08 21:45:45]

I think you need to add the chrome license to each of these files (or else the
pre-submit will complain)

+#define NET_QUIC_CORE_CONGESTION_CONTROL_SIMULATION_ACTOR_H_
+
+#include <std::string>
+
+#include "net/quic/core/quic_clock.h"
+#include "net/quic/core/quic_time.h"
+
+namespace net {
+namespace simulation {
+
+class Simulator;
+struct ScheduledActor;
+
+// Actor is the base class for all participants of the simulation which can
+// schedule events to be triggered at the specified time.  Every actor has a
+// name assigned to it, which can be used for debugging and addressing purposes.
+//
+// The Actor object is scheduled as follows:
+// 1. Every Actor object appears at most once in the event queue, for one
+//    specific time.
+// 2. Actor is scheduled by calling Schedule() method.
+// 3. If Schedule() method is called with multiple different times specified,
+//    Act() method will be called at the earliest time specified.
+// 4. Before Act() is called, the Actor is removed from the event queue.  Act()
+//    will not be called again unless Schedule() is called.
+class Actor {
+ public:
+  Actor(Simulator* simulator, std::std::string name);
+  virtual ~Actor();
+
+  // Trigger all the events the actor can potentially handle at this point.
+  // Before Act() is called, the actor is removed from the event queue, and has
+  // to schedule the next call manually.
+  virtual void Act() = 0;
+
+  inline std::std::string name() const { return name_; }
+  inline Simulator* simulator() const { return simulator_; }
+
+ protected:
+  // Calls Schedule() on the associated simulator.
+  void Schedule(QuicTime next_tick);
+
+  // Calls Unschedule() on the associated simulator.
+  void Unschedule();
+
+  Simulator* simulator_;
+  const QuicClock* clock_;
+  std::std::string name_;
+
+ private:
+  // Since the Actor object registers itself with a simulator using a pointer to
+  // itself, do not allow it to be moved.
+  Actor(Actor&&) = delete;
+  Actor& operator=(Actor&&) = delete;
+
+  DISALLOW_COPY_AND_ASSIGN(Actor);
+};
+
+}  // namespace simulation
+}  // namespace net
+
+#endif  // NET_QUIC_CORE_CONGESTION_CONTROL_SIMULATION_ACTOR_H_