Organize and consolidate header files (#220)

tooling/pipeline/includes/services/datetime/date_time_provider.h

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+#ifndef BIERGARTEN_PIPELINE_INCLUDES_SERVICES_DATETIME_DATE_TIME_PROVIDER_H_
+#define BIERGARTEN_PIPELINE_INCLUDES_SERVICES_DATETIME_DATE_TIME_PROVIDER_H_
+
+/**
+ * @file services/date_time_provider.h
+ * @brief Abstraction for UTC timestamp generation.
+ */
+
+#include <chrono>
+#include <ctime>
+#include <iomanip>
+#include <sstream>
+#include <stdexcept>
+#include <string>
+
+/**
+ * @brief Interface for UTC timestamp providers.
+ */
+class IDateTimeProvider {
+ public:
+  /// @brief Virtual destructor for polymorphic cleanup.
+  virtual ~IDateTimeProvider() = default;
+
+  IDateTimeProvider() = default;
+  IDateTimeProvider(const IDateTimeProvider&) = delete;
+  IDateTimeProvider& operator=(const IDateTimeProvider&) = delete;
+  IDateTimeProvider(IDateTimeProvider&&) = delete;
+  IDateTimeProvider& operator=(IDateTimeProvider&&) = delete;
+
+  /**
+   * @brief Returns the current UTC timestamp in a file-safe format.
+   *
+   * @return UTC timestamp string.
+   */
+  virtual std::string GetUtcTimestamp() = 0;
+};
+
+/**
+ * @brief Timestamp provider backed by the system clock.
+ */
+class SystemDateTimeProvider final : public IDateTimeProvider {
+ public:
+  std::string GetUtcTimestamp() override {
+    constexpr int kFractionalSecondWidth = 6;
+
+    const auto now = std::chrono::system_clock::now();
+    const auto now_time = std::chrono::system_clock::to_time_t(now);
+    const std::tm* utc_time_ptr = std::gmtime(&now_time);
+    if (utc_time_ptr == nullptr) {
+      throw std::runtime_error("Failed to format UTC timestamp");
+    }
+
+    const auto fractional_seconds =
+        std::chrono::duration_cast<std::chrono::microseconds>(
+            now.time_since_epoch()) %
+        std::chrono::seconds(1);
+
+    std::ostringstream output;
+    output << std::put_time(utc_time_ptr, "%Y-%m-%dT%H-%M-%S");
+    output << '.' << std::setw(kFractionalSecondWidth) << std::setfill('0')
+           << fractional_seconds.count() << 'Z';
+    return output.str();
+  }
+};
+
+#endif  // BIERGARTEN_PIPELINE_INCLUDES_SERVICES_DATETIME_DATE_TIME_PROVIDER_H_

tooling/pipeline/includes/services/datetime/timer.h

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+#ifndef BIERGARTEN_PIPELINE_INCLUDES_SERVICES_DATETIME_TIMER_H_
+#define BIERGARTEN_PIPELINE_INCLUDES_SERVICES_DATETIME_TIMER_H_
+
+#include <chrono>
+
+/**
+ * @file services/timer.h
+ * @brief Simple timer utility for measuring elapsed time.
+ */
+class Timer {
+  std::chrono::steady_clock::time_point start_time =
+      std::chrono::steady_clock::now();
+
+ public:
+  Timer(const Timer&) = delete;
+  Timer& operator=(const Timer&) = delete;
+  Timer(Timer&&) = delete;
+  Timer& operator=(Timer&&) = delete;
+  Timer() = default;
+  ~Timer() = default;
+
+  [[nodiscard]] int64_t Elapsed() const {
+    return std::chrono::duration_cast<std::chrono::milliseconds>(
+               std::chrono::steady_clock::now() - start_time)
+        .count();
+  }
+
+  [[nodiscard]] int64_t Reset() {
+    auto previous_elapsed = Elapsed();
+    start_time = std::chrono::steady_clock::now();
+    return previous_elapsed;
+  }
+};
+
+#endif  // BIERGARTEN_PIPELINE_INCLUDES_SERVICES_DATETIME_TIMER_H_