n_get_scu.h

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// BSD 3-Clause License
// Copyright (c) 2021-2025, 🍀☀🌕🌥 🌊
// See the LICENSE file in the project root for full license information.
 
#ifndef PACS_SERVICES_N_GET_SCU_HPP
#define PACS_SERVICES_N_GET_SCU_HPP
 
#include "kcenon/pacs/core/dicom_dataset.h"
#include "kcenon/pacs/core/dicom_tag.h"
#include "kcenon/pacs/di/ilogger.h"
#include "kcenon/pacs/network/association.h"
#include "kcenon/pacs/network/dimse/dimse_message.h"
 
#include <atomic>
#include <chrono>
#include <memory>
#include <string>
#include <string_view>
#include <vector>
 
namespace kcenon::pacs::services {
 
// =============================================================================
// N-GET SCU Data Structures
// =============================================================================
 
struct n_get_result {
    uint16_t status{0};
 
    core::dicom_dataset attributes;
 
    std::string error_comment;
 
    std::chrono::milliseconds elapsed{0};
 
    [[nodiscard]] bool is_success() const noexcept {
        return status == 0x0000;
    }
 
    [[nodiscard]] bool is_warning() const noexcept {
        return (status & 0xF000) == 0xB000;
    }
 
    [[nodiscard]] bool is_error() const noexcept {
        return !is_success() && !is_warning();
    }
};
 
struct n_get_scu_config {
    std::chrono::milliseconds timeout{30000};
};
 
// =============================================================================
// N-GET SCU Class
// =============================================================================
 
class n_get_scu {
public:
    // =========================================================================
    // Construction
    // =========================================================================
 
    explicit n_get_scu(std::shared_ptr<di::ILogger> logger = nullptr);
 
    explicit n_get_scu(const n_get_scu_config& config,
                       std::shared_ptr<di::ILogger> logger = nullptr);
 
    ~n_get_scu() = default;
 
    // Non-copyable, non-movable (due to atomic members)
    n_get_scu(const n_get_scu&) = delete;
    n_get_scu& operator=(const n_get_scu&) = delete;
    n_get_scu(n_get_scu&&) = delete;
    n_get_scu& operator=(n_get_scu&&) = delete;
 
    // =========================================================================
    // N-GET Operation
    // =========================================================================
 
    [[nodiscard]] network::Result<n_get_result> get(
        network::association& assoc,
        std::string_view sop_class_uid,
        std::string_view sop_instance_uid,
        const std::vector<core::dicom_tag>& attribute_tags = {});
 
    // =========================================================================
    // Statistics
    // =========================================================================
 
    [[nodiscard]] size_t gets_performed() const noexcept;
 
    void reset_statistics() noexcept;
 
private:
    // =========================================================================
    // Private Implementation
    // =========================================================================
 
    [[nodiscard]] uint16_t next_message_id() noexcept;
 
    // =========================================================================
    // Private Members
    // =========================================================================
 
    std::shared_ptr<di::ILogger> logger_;
    n_get_scu_config config_;
    std::atomic<uint16_t> message_id_counter_{1};
    std::atomic<size_t> gets_performed_{0};
};
 
}  // namespace kcenon::pacs::services
 
#endif  // PACS_SERVICES_N_GET_SCU_HPP