Moved live writer to std-det-writer

std-det-writer/src/WriterStats.cpp

@@ -0,0 +1,75 @@
+#include <iostream>
+#include <utility>
+#include "WriterStats.hpp"
+
+using namespace std;
+using namespace chrono;
+
+WriterStats::WriterStats(string detector_name) :
+    detector_name_(std::move(detector_name))
+{
+   reset_counters();
+}
+
+void WriterStats::reset_counters()
+{
+    image_counter_ = 0;
+    total_buffer_write_us_ = 0;
+    max_buffer_write_us_ = 0;
+    total_bytes_ = 0;
+}
+
+void WriterStats::start_image_write()
+{
+    stats_interval_start_ = steady_clock::now();
+}
+
+void WriterStats::end_image_write()
+{
+    image_counter_++;
+    total_bytes_ += image_n_bytes_;
+
+    uint32_t write_us_duration = duration_cast<microseconds>(
+            steady_clock::now()-stats_interval_start_).count();
+
+    total_buffer_write_us_ += write_us_duration;
+    max_buffer_write_us_ = max(max_buffer_write_us_, write_us_duration);
+}
+
+void WriterStats::start_run(const StoreStream& meta)
+{
+    image_n_bytes_ = (meta.image_y_size *
+                      meta.image_x_size *
+                      meta.bits_per_pixel) / 8;
+}
+
+void WriterStats::end_run()
+{
+    print_stats();
+    reset_counters();
+}
+
+void WriterStats::print_stats()
+{
+    const float avg_buffer_write_us = total_buffer_write_us_ / image_counter_;
+
+    const uint64_t timestamp = time_point_cast<nanoseconds>(
+            system_clock::now()).time_since_epoch().count();
+
+    const uint64_t avg_throughput =
+            // bytes -> megabytes
+            (image_n_bytes_ / 1024 / 1024) /
+            // micro seconds -> seconds
+            (avg_buffer_write_us * 1000 * 1000);
+
+    // Output in InfluxDB line protocol
+    cout << "jf_buffer_writer";
+    cout << ",detector_name=" << detector_name_;
+    cout << " ";
+    cout << "n_written_images=" << image_counter_ << "i";
+    cout << " ,avg_buffer_write_us=" << avg_buffer_write_us;
+    cout << " ,max_buffer_write_us=" << max_buffer_write_us_ << "i";
+    cout << " ,avg_throughput=" << avg_throughput;
+    cout << timestamp;
+    cout << endl;
+}