// -*- mode: c++; c-basic-offset: 4 -*-#ifndef CLICK_PI_HH#define CLICK_PI_HH#include <click/element.hh>#include <click/ewma.hh>#include <click/timer.hh>CLICK_DECLSclass Storage;class PI : public Element { public:    // Queue sizes are shifted by this much.    enum { QUEUE_SCALE = 10 };    typedef DirectEWMAX<StabilityEWMAXParameters<QUEUE_SCALE, uint64_t, int64_t> > ewma_type;    PI();    ~PI();    const char *class_name() const		{ return "PI"; }    const char *port_count() const		{ return PORTS_1_1X2; }    const char *processing() const		{ return PROCESSING_A_AH; }    int queue_size() const;    const ewma_type &average_queue_size() const { return _size; }    int drops() const				{ return _drops; }    int configure(Vector<String> &, ErrorHandler *);    int check_params(double, double, double, unsigned, unsigned, ErrorHandler *) const ;    int initialize(ErrorHandler *);    void cleanup(CleanupStage);    void take_state(Element *, ErrorHandler *);    bool can_live_reconfigure() const		{ return true; }    int live_reconfigure(Vector<String> &, ErrorHandler *);    void add_handlers();    bool should_drop();    void handle_drop(Packet *);    void push(int port, Packet *);    Packet *pull(int port);    void run_timer(Timer *);  protected:	Timer _timer;    Storage *_queue1;    Vector<Storage *> _queues;    ewma_type _size;    int _random_value;    int _last_jiffies;    int _drops;	double _a, _b, _w, _p;	unsigned _target_q, _old_q;    Vector<Element *> _queue_elements;    static String read_parameter(Element *, void *);    static const int MAX_RAND=2147483647;};CLICK_ENDDECLS#endif