1 // Copyright 2019 Google LLC 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef FCP_TRACING_TRACING_SPAN_REF_H_ 16 #define FCP_TRACING_TRACING_SPAN_REF_H_ 17 18 #include <memory> 19 #include <utility> 20 21 #include "fcp/tracing/tracing_span_id.h" 22 23 namespace fcp { 24 25 namespace tracing_internal { 26 class TracingRecorderImpl; 27 } 28 29 // Reference to a tracing span. 30 class TracingSpanRef { 31 // Reference to the tracing recorder this reference was issued by: 32 std::shared_ptr<fcp::tracing_internal::TracingRecorderImpl> recorder_; 33 // Identifier of the span 34 TracingSpanId span_id_; 35 36 public: TracingSpanRef(std::shared_ptr<fcp::tracing_internal::TracingRecorderImpl> provider,TracingSpanId span_id)37 TracingSpanRef( 38 std::shared_ptr<fcp::tracing_internal::TracingRecorderImpl> provider, 39 TracingSpanId span_id) 40 : recorder_(std::move(provider)), span_id_(span_id) {} 41 recorder()42 std::shared_ptr<tracing_internal::TracingRecorderImpl> recorder() { 43 return recorder_; 44 } 45 span_id()46 TracingSpanId span_id() const { return span_id_; } 47 48 // Returns reference to the top tracing span on the current 49 // thread/fiber. If there's no tracing span established, a 50 // reference to the root span of global tracing recorder is returned. 51 static TracingSpanRef Top(); 52 }; 53 54 } // namespace fcp 55 #endif // FCP_TRACING_TRACING_SPAN_REF_H_ 56