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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 <atomic>
#include <mutex>
#include <memory>
#include <thread>
#include <vespa/vespalib/stllike/string.h>
#include "current_samples.h"
#include "snapshots.h"
#include "metrics_manager.h"
#include "metric_types.h"
#include "clock.h"
#include "bucket.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:
MetricTypes _metricTypes;
CurrentSamples _currentSamples;
Tick::UP _tickSupplier;
TimeStamp _startTime;
TimeStamp _curTime;
std::mutex _bucketsLock;
size_t _collectCnt;
std::vector<Bucket> _buckets;
size_t _firstBucket;
size_t _maxBuckets;
Bucket _totalsBucket;
std::thread _thread;
void tickerLoop();
void stopThread();
void tick(TimeStamp now); // called once per second from another thread
void collectCurrentSamples(TimeStamp prev, TimeStamp curr);
Bucket mergeBuckets();
Bucket totalsBucket();
Snapshot snapshotFrom(const Bucket &bucket);
SimpleMetricsManager(const SimpleManagerConfig &config,
Tick::UP tick_supplier);
public:
~SimpleMetricsManager();
static std::shared_ptr<MetricsManager> create(const SimpleManagerConfig &config);
static std::shared_ptr<MetricsManager> createForTest(const SimpleManagerConfig &config,
Tick::UP tick_supplier);
Counter counter(const vespalib::string &name, const vespalib::string &description) override;
Gauge gauge(const vespalib::string &name, const vespalib::string &description) override;
Dimension dimension(const vespalib::string &name) override;
Label label(const vespalib::string &value) override;
PointBuilder pointBuilder(Point from) override;
Point pointFrom(PointMap map) override;
Snapshot snapshot() override;
Snapshot totalSnapshot() override;
// for use from Counter only
void add(Counter::Increment inc) override {
_currentSamples.add(inc);
}
// for use from Gauge only
void sample(Gauge::Measurement value) override {
_currentSamples.sample(value);
}
};
} // namespace vespalib::metrics
} // namespace vespalib
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