ceph/src/jaegertracing/jaeger-client-cpp/src/jaegertracing/samplers/ConstSampler.h

   1 /*
   2  * Copyright (c) 2017 Uber Technologies, Inc.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #ifndef JAEGERTRACING_SAMPLERS_CONSTSAMPLER_H
  18 #define JAEGERTRACING_SAMPLERS_CONSTSAMPLER_H
  19
  20 #include "jaegertracing/Constants.h"
  21 #include "jaegertracing/Tag.h"
  22 #include "jaegertracing/samplers/Sampler.h"
  23 #include "jaegertracing/samplers/SamplingStatus.h"
  24 #include <string>
  25 #include <vector>
  26
  27 namespace jaegertracing {
  28 class TraceID;
  29 }  // namespace jaegertracing
  30
  31 namespace jaegertracing {
  32 namespace samplers {
  33
  34 class ConstSampler : public Sampler {
  35   public:
  36     explicit ConstSampler(bool sample)
  37         : _decision(sample)
  38         , _tags({ { kSamplerTypeTagKey, kSamplerTypeConst },
  39                   { kSamplerParamTagKey, _decision } })
  40     {
  41     }
  42
  43     SamplingStatus isSampled(const TraceID& id,
  44                              const std::string& operation) override
  45     {
  46         return SamplingStatus(_decision, _tags);
  47     }
  48
  49     void close() override {}
  50
  51     Type type() const override { return Type::kConstSampler; }
  52
  53   private:
  54     bool _decision;
  55     std::vector<Tag> _tags;
  56 };
  57
  58 }  // namespace samplers
  59 }  // namespace jaegertracing
  60
  61 #endif  // JAEGERTRACING_SAMPLERS_CONSTSAMPLER_H