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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <memory>
#include <thread>
#include <vespa/vespalib/stllike/string.h>
#include "name_collection.h"
#include "current_samples.h"
#include "snapshots.h"
#include "metrics_manager.h"
#include "metric_types.h"
#include "clock.h"
#include "point_map_collection.h"
#include "bucket.h"
#include "ticker_thread.h"
namespace vespalib {
namespace metrics {
struct SimpleManagerConfig {
int sliding_window_seconds;
// possibly more config later
SimpleManagerConfig() : sliding_window_seconds(60) {}
};
/**
* Simple manager class that puts everything into a
* single global repo with std::mutex locks used around
* most operations. Only implements sliding window
* and a fixed (1 Hz) collecting interval.
* XXX: Consider renaming this to "SlidingWindowManager".
**/
class SimpleMetricsManager : public MetricsManager
{
private:
NameCollection _metricNames;
MetricTypes _metricTypes;
NameCollection _dimensionNames;
NameCollection _labelValues;
PointMapCollection _pointMaps;
const vespalib::string& nameFor(Dimension dimension) { return _dimensionNames.lookup(dimension.id()); }
const vespalib::string& valueFor(Label label) { return _labelValues.lookup(label.id()); }
CurrentSamples _currentBucket;
InternalTimeStamp _startTime;
InternalTimeStamp _curTime;
std::mutex _bucketsLock;
size_t _collectCnt;
std::vector<Bucket> _buckets;
size_t _firstBucket;
size_t _maxBuckets;
Bucket _totalsBucket;
std::mutex _tickLock;
TickerThread _ticker;
void collectCurrentBucket(InternalTimeStamp prev, InternalTimeStamp curr);
Bucket mergeBuckets();
Bucket totalsBucket();
Snapshot snapshotFrom(const Bucket &bucket);
SimpleMetricsManager(const SimpleManagerConfig &config);
public:
~SimpleMetricsManager();
static std::shared_ptr<MetricsManager> create(const SimpleManagerConfig &config);
Counter counter(const vespalib::string &name) override;
Gauge gauge(const vespalib::string &name) override;
Dimension dimension(const vespalib::string &name) override;
Label label(const vespalib::string &value) override;
PointBuilder pointBuilder(Point from) override;
Point pointFrom(PointMap::BackingMap map) override;
Snapshot snapshot() override;
Snapshot totalSnapshot() override;
// for use from Counter only
void add(Counter::Increment inc) override {
_currentBucket.add(inc);
}
// for use from Gauge only
void sample(Gauge::Measurement value) override {
_currentBucket.sample(value);
}
void tick(); // called once per second from another thread
};
} // namespace vespalib::metrics
} // namespace vespalib
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