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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#ifndef mozilla_glean_GleanNumerator_h
#define mozilla_glean_GleanNumerator_h
#include "mozilla/dom/BindingDeclarations.h"
#include "mozilla/glean/bindings/GleanMetric.h"
#include "mozilla/Maybe.h"
#include "mozilla/Result.h"
#include "nsString.h"
namespace mozilla::dom {
struct GleanRateData;
} // namespace mozilla::dom
namespace mozilla::glean {
namespace impl {
// Actually a RateMetric, but one whose denominator is a CounterMetric external
// to the RateMetric.
class NumeratorMetric {
public:
constexpr explicit NumeratorMetric(uint32_t aId) : mId(aId) {}
/*
* Increases the numerator by `amount`.
*
* @param aAmount The amount to increase by. Should be positive.
*/
void AddToNumerator(int32_t aAmount = 1) const;
/**
* **Test-only API**
*
* Gets the currently stored value as a pair of integers.
*
* This function will attempt to await the last parent-process task (if any)
* writing to the the metric's storage engine before returning a value.
* This function will not wait for data from child processes.
*
* This doesn't clear the stored value.
* Parent process only. Panics in child processes.
*
* @param aPingName The (optional) name of the ping to retrieve the metric
* for. Defaults to the first value in `send_in_pings`.
*
* @return value of the stored metric, or Nothing() if there is no value.
*/
Result<Maybe<std::pair<int32_t, int32_t>>, nsCString> TestGetValue(
const nsACString& aPingName = nsCString()) const;
private:
const uint32_t mId;
};
} // namespace impl
class GleanNumerator final : public GleanMetric {
public:
explicit GleanNumerator(uint32_t id, nsISupports* aParent)
: GleanMetric(aParent), mNumerator(id) {}
virtual JSObject* WrapObject(
JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override final;
void AddToNumerator(int32_t aAmount);
void TestGetValue(const nsACString& aPingName,
dom::Nullable<dom::GleanRateData>& aResult,
ErrorResult& aRv);
private:
virtual ~GleanNumerator() = default;
const impl::NumeratorMetric mNumerator;
};
} // namespace mozilla::glean
#endif /* mozilla_glean_GleanNumerator_h */