statistics.hh

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     */
    StatStor(const Params &) : data(Counter()) {}

    /**
     * The the stat to the given value.
     * @param val The new value.
     * @param p The paramters of this storage type.
     */
    void set(Counter val, const Params &p) { data = val; }
    /**
     * Increment the stat by the given value.
     * @param val The new value.
     * @param p The paramters of this storage type.
     */
    void inc(Counter val, const Params &p) { data += val; }
    /**
     * Decrement the stat by the given value.
     * @param val The new value.
     * @param p The paramters of this storage type.
     */
    void dec(Counter val, const Params &p) { data -= val; }
    /**
     * Return the value of this stat as its base type.
     * @param p The params of this storage type.
     * @return The value of this stat.
     */
    Counter value(const Params &p) const { return data; }
    /**
     * Return the value of this stat as a result type.
     * @param p The parameters of this storage type.
     * @return The value of this stat.
     */
    Result result(const Params &p) const { return (Result)data; }
    /**
     * Reset stat value to default
     */
    void reset() { data = Counter(); }

    /**
     * @return true if zero value
     */
    bool zero() const { return data == Counter(); }
};

/**
 * Templatized storage and interface to a per-tick average stat. This keeps
 * a current count and updates a total (count * ticks) when this count
 * changes. This allows the quick calculation of a per tick count of the item
 * being watched. This is good for keeping track of residencies in structures
 * among other things.
 */
struct AvgStor
{
  public:
    /** The paramaters for this storage type */
    struct Params { };

  private:
    /** The current count. */
    Counter current;
    /** The total count for all tick. */
    mutable Result total;
    /** The tick that current last changed. */
    mutable Tick last;

  public:
    /**
     * Build and initializes this stat storage.
     */
    AvgStor(Params &p) : current(0), total(0), last(0) { }

    /**
     * Set the current count to the one provided, update the total and last
     * set values.
     * @param val The new count.
     * @param p The parameters for this storage.
     */
    void set(Counter val, Params &p) {
        total += current * (curTick - last);
        last = curTick;
        current = val;
    }

    /**
     * Increment the current count by the provided value, calls set.
     * @param val The amount to increment.
     * @param p The parameters for this storage.
     */
    void inc(Counter val, Params &p) { set(current + val, p); }

    /**
     * Deccrement the current count by the provided value, calls set.
     * @param val The amount to decrement.
     * @param p The parameters for this storage.
     */
    void dec(Counter val, Params &p) { set(current - val, p); }

    /**
     * Return the current count.
     * @param p The parameters for this storage.
     * @return The current count.
     */
    Counter value(const Params &p) const { return current; }

    /**
     * Return the current average.
     * @param p The parameters for this storage.
     * @return The current average.
     */
    Result result(const Params &p) const
    {
        total += current * (curTick - last);
        last = curTick;
        return (Result)(total + current) / (Result)(curTick + 1);
    }

    /**
     * Reset stat value to default
     */
    void reset()
    {
        total = 0;
        last = curTick;
    }

    /**
     * @return true if zero value
     */
    bool zero() const { return total == 0.0; }
};

/**
 * Implementation of a scalar stat. The type of stat is determined by the
 * Storage template.
 */
template <class Stor>
class ScalarBase : public DataAccess
{
  public:
    typedef Stor Storage;

    /** Define the params of the storage class. */
    typedef typename Storage::Params Params;

  protected:
    /** The storage of this stat. */
    char storage[sizeof(Storage)] __attribute__ ((aligned (8)));

    /** The parameters for this stat. */
    Params params;

  protected:
    /**
     * Retrieve the storage.
     * @param index The vector index to access.
     * @return The storage object at the given index.
     */
    Storage *
    data()
    {
        return reinterpret_cast<Storage *>(storage);
    }

    /**
     * Retrieve a const pointer to the storage.
     * for the given index.
     * @param index The vector index to access.
     * @return A const pointer to the storage object at the given index.
     */
    const Storage *
    data() const
    {
        return reinterpret_cast<const Storage *>(storage);
    }

    void
    doInit()
    {
        new (storage) Storage(params);
        setInit();
    }

  public:
    /**
     * Return the current value of this stat as its base type.
     * @return The current value.
     */
    Counter value() const { return data()->value(params); }

  public:
    /**
     * Create and initialize this stat, register it with the database.
     */
    ScalarBase()
    { }

  public:
    // Common operators for stats
    /**
     * Increment the stat by 1. This calls the associated storage object inc
     * function.
     */
    void operator++() { data()->inc(1, params); }
    /**
     * Decrement the stat by 1. This calls the associated storage object dec
     * function.
     */
    void operator--() { data()->dec(1, params); }

    /** Increment the stat by 1. */
    void operator++(int) { ++*this; }
    /** Decrement the stat by 1. */
    void operator--(int) { --*this; }

    /**
     * Set the data value to the given value. This calls the associated storage
     * object set function.
     * @param v The new value.
     */
    template <typename U>
    void operator=(const U &v) { data()->set(v, params); }

    /**
     * Increment the stat by the given value. This calls the associated
     * storage object inc function.
     * @param v The value to add.
     */
    template <typename U>
    void operator+=(const U &v) { data()->inc(v, params); }

    /**
     * Decrement the stat by the given value. This calls the associated
     * storage object dec function.
     * @param v The value to substract.
     */
    template <typename U>
    void operator-=(const U &v) { data()->dec(v, params); }

    /**
     * Return the number of elements, always 1 for a scalar.
     * @return 1.
     */
    size_t size() const { return 1; }

    bool check() const { return true; }

    /**
     * Reset stat value to default
     */
    void reset() { data()->reset(); }

    Counter value() { return data()->value(params); }

    Result result() { return data()->result(params); }

    Result total() { return result(); }

    bool zero() { return result() == 0.0; }

};

class ProxyData : public ScalarData
{
  public:
    virtual void visit(Visit &visitor) { visitor.visit(*this); }
    virtual std::string str() const { return to_string(value()); }
    virtual size_t size() const { return 1; }
    virtual bool zero() const { return value() == 0; }
    virtual bool check() const { return true; }
    virtual void reset() { }
};

template <class T>
class ValueProxy : public ProxyData
{
  private:
    T *scalar;

  public:
    ValueProxy(T &val) : scalar(&val) {}
    virtual Counter value() const { return *scalar; }
    virtual Result result() const { return *scalar; }
    virtual Result total() const { return *scalar; }
};

template <class T>
class FunctorProxy : public ProxyData
{
  private:
    T *functor;

  public:
    FunctorProxy(T &func) : functor(&func) {}
    virtual Counter value() const { return (*functor)(); }
    virtual Result result() const { return (*functor)(); }
    virtual Result total() const { return (*functor)(); }
};

class ValueBase : public DataAccess
{
  private:
    ProxyData *proxy;

  public:
    ValueBase() : proxy(NULL) { }
    ~ValueBase() { if (proxy) delete proxy; }

    template <class T>
    void scalar(T &value)
    {
        proxy = new ValueProxy<T>(value);
        setInit();
    }

    template <class T>
    void functor(T &func)
    {
        proxy = new FunctorProxy<T>(func);
        setInit();
    }

    Counter value() { return proxy->value(); }
    Result result() const { return proxy->result(); }
    Result total() const { return proxy->total(); };
    size_t size() const { return proxy->size(); }

    std::string str() const { return proxy->str(); }
    bool zero() const { return proxy->zero(); }
    bool check() const { return proxy != NULL; }
    void reset() { }
};

//////////////////////////////////////////////////////////////////////
//
// Vector Statistics
//
//////////////////////////////////////////////////////////////////////

/**
 * A proxy class to access the stat at a given index in a VectorBase stat.
 * Behaves like a ScalarBase.
 */
template <class Stat>
class ScalarProxy
{
  private:
    /** Pointer to the parent Vector. */
    Stat *stat;

    /** The index to access in the parent VectorBase. */
    int index;

  public:
    /**
     * Return the current value of this stat as its base type.
     * @return The current value.
     */
    Counter value() const { return stat->data(index)->value(stat->params); }

    /**
     * Return the current value of this statas a result type.
     * @return The current value.
     */
    Result result() const { return stat->data(index)->result(stat->params); }

  public:
    /**
     * Create and initialize this proxy, do not register it with the database.
     * @param p The params to use.
     * @param i The index to access.
     */
    ScalarProxy(Stat *s, int i)
        : stat(s), index(i)
    {
        assert(stat);
    }

    /**
     * Create a copy of the provided ScalarProxy.
     * @param sp The proxy to copy.
     */
    ScalarProxy(const ScalarProxy &sp)
        : stat(sp.stat), index(sp.index)
    {}

    /**
     * Set this proxy equal to the provided one.
     * @param sp The proxy to copy.
     * @return A reference to this proxy.
     */
    const ScalarProxy &operator=(const ScalarProxy &sp) {
        stat = sp.stat;
        index = sp.index;
        return *this;
    }

  public:
    // Common operators for stats
    /**
     * Increment the stat by 1. This calls the associated storage object inc
     * function.
     */
    void operator++() { stat->data(index)->inc(1, stat->params); }
    /**
     * Decrement the stat by 1. This calls the associated storage object dec
     * function.
     */
    void operator--() { stat->data(index)->dec(1, stat->params); }

    /** Increment the stat by 1. */
    void operator++(int) { ++*this; }
    /** Decrement the stat by 1. */
    void operator--(int) { --*this; }

    /**
     * Set the data value to the given value. This calls the associated storage
     * object set function.
     * @param v The new value.
     */
    template <typename U>
    void operator=(const U &v) { stat->data(index)->set(v, stat->params); }

    /**
     * Increment the stat by the given value. This calls the associated
     * storage object inc function.
     * @param v The value to add.
     */
    template <typename U>
    void operator+=(const U &v) { stat->data(index)->inc(v, stat->params); }

    /**
     * Decrement the stat by the given value. This calls the associated
     * storage object dec function.
     * @param v The value to substract.
     */
    template <typename U>
    void operator-=(const U &v) { stat->data(index)->dec(v, stat->params); }

    /**
     * Return the number of elements, always 1 for a scalar.
     * @return 1.
     */
    size_t size() const { return 1; }

    /**
     * This stat has no state.  Nothing to reset
     */
    void reset() {  }

  public:
    std::string
    str() const
    {
        return csprintf("%s[%d]", stat->str(), index);

    }
};

/**
 * Implementation of a vector of stats. The type of stat is determined by the
 * Storage class. @sa ScalarBase
 */
template <class Stor>
class VectorBase : public DataAccess
{
  public:
    typedef Stor Storage;

    /** Define the params of the storage class. */
    typedef typename Storage::Params Params;

    /** Proxy type */
    typedef ScalarProxy<VectorBase<Storage> > Proxy;

    friend class ScalarProxy<VectorBase<Storage> >;

  protected:
    /** The storage of this stat. */
    Storage *storage;
    size_t _size;

    /** The parameters for this stat. */
    Params params;

  protected:
    /**
     * Retrieve the storage.
     * @param index The vector index to access.
     * @return The storage object at the given index.
     */
    Storage *data(int index) { return &storage[index]; }

    /**
     * Retrieve a const pointer to the storage.
     * @param index The vector index to access.
     * @return A const pointer to the storage object at the given index.
     */
    const Storage *data(int index) const { return &storage[index]; }

    void
    doInit(int s)
    {
        assert(s > 0 && "size must be positive!");
        assert(!storage && "already initialized");
        _size = s;

        char *ptr = new char[_size * sizeof(Storage)];
        storage = reinterpret_cast<Storage *>(ptr);

        for (int i = 0; i < _size; ++i)
            new (&storage[i]) Storage(params);

        setInit();
    }

  public:
    void value(VCounter &vec) const
    {
        vec.resize(size());
        for (int i = 0; i < size(); ++i)
            vec[i] = data(i)->value(params);
    }

    /**
     * Copy the values to a local vector and return a reference to it.
     * @return A reference to a vector of the stat values.
     */
    void result(VResult &vec) const
    {
        vec.resize(size());
        for (int i = 0; i < size(); ++i)
            vec[i] = data(i)->result(params);
    }

    /**
     * Return a total of all entries in this vector.
     * @return The total of all vector entries.
     */
    Result total() const {
        Result total = 0.0;
        for (int i = 0; i < size(); ++i)
            total += data(i)->result(params);
        return total;
    }

    /**
     * @return the number of elements in this vector.
     */
    size_t size() const { return _size; }

    bool
    zero() const
    {
        for (int i = 0; i < size(); ++i)
            if (data(i)->zero())