72 lines
2.1 KiB
C
72 lines
2.1 KiB
C
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/*
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* Copyright 2018 The Cartographer Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef CARTOGRAPHER_METRICS_FAMILY_FACTORY_H_
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#define CARTOGRAPHER_METRICS_FAMILY_FACTORY_H_
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#include <memory>
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#include <string>
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#include "cartographer/metrics/counter.h"
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#include "cartographer/metrics/gauge.h"
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#include "cartographer/metrics/histogram.h"
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namespace cartographer {
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namespace metrics {
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template <typename MetricType>
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class NullFamily;
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template <typename MetricType>
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class Family {
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public: // Family instance that does nothing. Safe for use in static
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// initializers.
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static Family<MetricType>* Null() {
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static NullFamily<MetricType> null_family;
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return &null_family;
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}
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virtual ~Family() = default;
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virtual MetricType* Add(const std::map<std::string, std::string>& labels) = 0;
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};
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template <typename MetricType>
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class NullFamily : public Family<MetricType> {
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public:
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MetricType* Add(const std::map<std::string, std::string>& labels) override {
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return MetricType::Null();
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}
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};
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class FamilyFactory {
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public:
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virtual ~FamilyFactory() = default;
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virtual Family<Counter>* NewCounterFamily(const std::string& name,
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const std::string& description) = 0;
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virtual Family<Gauge>* NewGaugeFamily(const std::string& name,
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const std::string& description) = 0;
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virtual Family<Histogram>* NewHistogramFamily(
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const std::string& name, const std::string& description,
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const Histogram::BucketBoundaries& boundaries) = 0;
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};
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} // namespace metrics
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} // namespace cartographer
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#endif // CARTOGRAPHER_METRICS_FAMILY_FACTORY_H_
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