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/* 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
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
#ifndef GECKO_TRACE_SPAN_EVENT_H
#define GECKO_TRACE_SPAN_EVENT_H
#include "nsVariant.h"
namespace mozilla::gecko_trace {
using string_view = std::string_view;
// TODO: Support Span types in AttributeValue
using AttributeValue = Variant<bool, int64_t, string_view
// ,Span<bool>,
// Span<int64_t>,
// Span<string_view>
>;
// Note: Consider adding a mechanism to prevent manual implementation of
// this interface for types.
class SpanEvent {
public:
virtual ~SpanEvent() = default;
/**
* Iterate over all key-value pairs in this event.
*
* Calls the provided callback function for each attribute set on this event
* instance. The iteration includes attributes from parent classes if this
* event inherits from other events.
*
* @param aCallback Function to call for each key-value pair.
* Should return true to continue iteration, false to stop.
* @return true if all callbacks returned true, false if any returned false
*/
virtual bool ForEachKeyValue(
std::function<bool(string_view, AttributeValue)> aCallback) const = 0;
/**
* Get the name identifier for this trace event.
*
* Returns the string identifier used to categorize and filter this event
* type in trace collection and analysis tools.
*
* @return String view containing the event name
*/
virtual string_view GetEventName() const = 0;
/**
* Get the total number of attributes this event can contain.
*
* Returns the count of all possible attributes, including those inherited
* from parent event classes.
*
* @return Total attribute count
*/
virtual size_t Size() const = 0;
#ifdef GECKO_TRACE_ENABLE
void Emit();
#else
constexpr void Emit() {};
#endif
};
} // namespace mozilla::gecko_trace
#endif // GECKO_TRACE_SPAN_EVENT_H
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