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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/metrics/metric.h>
#include <vespa/vespalib/util/jsonstream.h>
namespace metrics {
class JsonWriter : public MetricVisitor, public vespalib::JsonStreamTypes {
vespalib::JsonStream& _stream;
enum Flag { NOT_STARTED, SNAPSHOT_STARTED, METRICS_WRITTEN };
Flag _flag;
// Not a "true" set, but dimensions are guaranteed to be unique for any
// given metric set.
using DimensionSet = Metric::Tags;
std::vector<DimensionSet> _dimensionStack;
uint64_t _period;
public:
explicit JsonWriter(vespalib::JsonStream&);
private:
bool visitSnapshot(const MetricSnapshot&) override;
void doneVisitingSnapshot(const MetricSnapshot&) override;
bool visitMetricSet(const MetricSet&, bool autoGenerated) override;
void doneVisitingMetricSet(const MetricSet&) override;
bool visitCountMetric(const AbstractCountMetric&, bool autoGenerated) override;
bool visitValueMetric(const AbstractValueMetric&, bool autoGenerated) override;
void doneVisiting() override;
void writeCommonPrefix(const Metric& m);
void writeCommonPostfix(const Metric& m);
void writeDimensions(const DimensionSet&);
void writeInheritedDimensions();
void writeMetricSpecificDimensions(const Metric&);
static bool isLeafMetric(const Metric& m) { return !m.isMetricSet(); }
};
}
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