| /* |
| * Copyright 2012 Google Inc. |
| * |
| * 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. |
| */ |
| |
| // Author: piatek@google.com (Michael Piatek) |
| |
| #ifndef PAGESPEED_KERNEL_BASE_REQUEST_TRACE_H_ |
| #define PAGESPEED_KERNEL_BASE_REQUEST_TRACE_H_ |
| |
| #include <cstdarg> |
| |
| #include "pagespeed/kernel/base/basictypes.h" |
| #include "pagespeed/kernel/base/string.h" |
| |
| namespace net_instaweb { |
| |
| // The context for recording a distributed trace associated with a given |
| // request. |
| class RequestTrace { |
| public: |
| RequestTrace(); |
| virtual ~RequestTrace(); |
| |
| // Logs formatted output to the distributed tracing context. |
| virtual void TraceVPrintf(const char* fm, va_list argp) = 0; |
| void TracePrintf(const char* fmt, ...); |
| // Logs a literal C string to the tracing context. The literal has indefinite |
| // lifespan (ie it must be a compile time constant); use TraceString if your |
| // data has a bounded lifetime. |
| virtual void TraceLiteral(const char* literal) = 0; |
| // Logs a short-lived string to the tracing context. |
| virtual void TraceString(const GoogleString& s) = 0; |
| |
| // Returns true iff tracing is enabled. This can be used to avoid virtual |
| // function call overhead in the common case that tracing is not active for |
| // a given request. |
| bool tracing_enabled() { return tracing_enabled_; } |
| void set_tracing_enabled(bool x) { tracing_enabled_ = x; } |
| |
| private: |
| bool tracing_enabled_; |
| |
| DISALLOW_COPY_AND_ASSIGN(RequestTrace); |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // PAGESPEED_KERNEL_BASE_REQUEST_TRACE_H_ |