tracer.h

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/*
 * Copyright 2026 The A11 Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#ifndef A11_OBS_TRACER_H_
#define A11_OBS_TRACER_H_
 
#include <string_view>
 
#include "a11/obs/span.h"
#include "a11/obs/trace_context.h"
 
namespace a11::obs {
 
class Tracer {
 public:
  // Starts a span continuing a remote parent recovered from headers.
  static Span StartSpan(std::string_view name, SpanKind kind,
                        const TraceContext* parent);
 
  // Starts a span parented to an in-process span, inheriting its baggage.
  static Span StartChildSpan(std::string_view name, SpanKind kind,
                             const Span& parent);
 
  // Starts a root span for a session or stream, optionally pinning the trace id
  // (32 lowercase hex chars).
  static Span StartRootSpan(std::string_view name, SpanKind kind,
                            std::string_view preassigned_trace_id = {});
};
 
}  // namespace a11::obs
 
#endif  // A11_OBS_TRACER_H_