Program Listing for File event_logger.h

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0

#pragma once

#include "opentelemetry/logs/log_record.h"
#include "opentelemetry/logs/logger.h"
#include "opentelemetry/logs/logger_type_traits.h"
#include "opentelemetry/nostd/shared_ptr.h"
#include "opentelemetry/nostd/string_view.h"
#include "opentelemetry/nostd/unique_ptr.h"
#include "opentelemetry/version.h"

OPENTELEMETRY_BEGIN_NAMESPACE
namespace logs
{
#if OPENTELEMETRY_ABI_VERSION_NO < 2

class EventLogger
{
public:
  EventLogger()                                   = default;
  EventLogger(const EventLogger &)                = default;
  EventLogger(EventLogger &&) noexcept            = default;
  EventLogger &operator=(const EventLogger &)     = default;
  EventLogger &operator=(EventLogger &&) noexcept = default;
  virtual ~EventLogger()                          = default;

  /* Returns the name of the logger */
  virtual const nostd::string_view GetName() noexcept = 0;

  /* Returns the delegate logger of this event logger */
  virtual nostd::shared_ptr<Logger> GetDelegateLogger() noexcept = 0;

  virtual void EmitEvent(nostd::string_view event_name,
                         nostd::unique_ptr<LogRecord> &&log_record) noexcept = 0;

  template <class... ArgumentType>
  void EmitEvent(nostd::string_view event_name, ArgumentType &&...args)
  {
    nostd::shared_ptr<Logger> delegate_logger = GetDelegateLogger();
    if (!delegate_logger)
    {
      return;
    }
    nostd::unique_ptr<LogRecord> log_record = delegate_logger->CreateLogRecord();

    IgnoreTraitResult(detail::LogRecordSetterTrait<typename std::decay<ArgumentType>::type>::Set(
        log_record.get(), std::forward<ArgumentType>(args))...);

    EmitEvent(event_name, std::move(log_record));
  }

private:
  template <class... ValueType>
  void IgnoreTraitResult(ValueType &&...)
  {}
};
#endif
}  // namespace logs
OPENTELEMETRY_END_NAMESPACE