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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/util/time.h>
#include <mutex>
namespace metrics {
using time_point = vespalib::system_time;
class MetricLockGuard {
public:
MetricLockGuard(std::mutex & mutex);
MetricLockGuard(const MetricLockGuard &) = delete;
MetricLockGuard & operator =(const MetricLockGuard &) = delete;
MetricLockGuard(MetricLockGuard &&) = default;
MetricLockGuard & operator =(MetricLockGuard &&) = default;
~MetricLockGuard();
bool owns(const std::mutex &) const;
operator std::unique_lock<std::mutex> & () { return _guard; }
private:
std::unique_lock<std::mutex> _guard;
};
class MetricManager;
class UpdateHook {
public:
using MetricLockGuard = metrics::MetricLockGuard;
UpdateHook(const char* name, time_point::duration period)
: _name(name),
_period(period),
_nextCall()
{}
virtual ~UpdateHook() = default;
virtual void updateMetrics(const MetricLockGuard & guard) = 0;
const char* getName() const { return _name; }
void updateNextCall() { updateNextCall(_nextCall); }
void updateNextCall(time_point now) { setNextCall(now + _period); }
bool is_periodic() const noexcept { return _period != time_point::duration::zero(); }
bool expired(time_point now) { return _nextCall <= now; }
bool has_valid_expiry() const noexcept { return _nextCall != time_point(); }
time_point::duration getPeriod() const noexcept { return _period; }
time_point getNextCall() const noexcept { return _nextCall; }
void setNextCall(time_point now) { _nextCall = now; }
private:
const char* _name;
const time_point::duration _period;
time_point _nextCall;
};
}
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