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49bd8ac880
* Remove shared_ptr legacy support * Add make_unique support for pre-C++14 environments * Fix comparison bug in sqdb * Use std::shared_ptr in a few places
99 lines
2.9 KiB
C++
99 lines
2.9 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef BEAST_INSIGHT_METER_H_INCLUDED
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#define BEAST_INSIGHT_METER_H_INCLUDED
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#include "MeterImpl.h"
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#include <memory>
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namespace beast {
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namespace insight {
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/** A metric for measuring an integral value.
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A meter may be thought of as an increment-only counter.
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This is a lightweight reference wrapper which is cheap to copy and assign.
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When the last reference goes away, the metric is no longer collected.
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*/
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class Meter
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{
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public:
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typedef MeterImpl::value_type value_type;
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/** Create a null metric.
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A null metric reports no information.
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*/
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Meter ()
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{
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}
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/** Create the metric reference the specified implementation.
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Normally this won't be called directly. Instead, call the appropriate
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factory function in the Collector interface.
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@see Collector.
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*/
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explicit Meter (std::shared_ptr <MeterImpl> const& impl)
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: m_impl (impl)
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{
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}
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/** Set a handler for polling.
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If a handler is set, it will be called once per collection interval.
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This may be used to implement polling style collection instead of
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push style.
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Handler will be called with this signature:
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void Handler (Meter const&);
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*/
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template <class Handler>
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void set_handler (Handler handler) const
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{
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m_impl->set_handler (handler);
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}
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/** Increment the meter. */
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/** @{ */
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void increment (value_type amount) const
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{
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if (m_impl)
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m_impl->increment (amount);
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}
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Meter const& operator+= (value_type amount) const
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{ increment (amount); return *this; }
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Meter const& operator++ () const
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{ increment (1); return *this; }
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Meter const& operator++ (int) const
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{ increment (1); return *this; }
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/** @} */
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private:
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std::shared_ptr <MeterImpl> m_impl;
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};
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}
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}
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#endif
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