Simulated User service. More...

Collaboration diagram for UserService:

Public Member Functions
trace_span	get_user_profile (const trace_context &parent_ctx, const std::string &user_id)
	Fetch user profile.

Static Private Member Functions
static std::string	generate_span_id ()

Private Attributes
std::string	service_name_ = "user_service"

Detailed Description

Simulated User service.

Examples: multi_service_tracing_example.cpp.

Definition at line 175 of file multi_service_tracing_example.cpp.

Member Function Documentation

◆ generate_span_id()

static std::string UserService::generate_span_id ( )

inlinestaticprivate

Examples: multi_service_tracing_example.cpp.

Definition at line 223 of file multi_service_tracing_example.cpp.

                                        {
        std::string id;
        for (int i = 0; i < 16; ++i) {
            id += "0123456789abcdef"[rand() % 16];
        }
        return id;
    }

Referenced by get_user_profile().

Here is the caller graph for this function:

◆ get_user_profile()

trace_span UserService::get_user_profile	(	const trace_context &	parent_ctx,
		const std::string &	user_id )

inline

Fetch user profile.

Examples: multi_service_tracing_example.cpp.

Definition at line 183 of file multi_service_tracing_example.cpp.

                                                                                           {
        std::cout << "\n[" << service_name_ << "] Fetching user profile" << std::endl;
        std::cout << "   User ID from baggage: " << parent_ctx.baggage.at("user.id") << std::endl;
 
        // Create child span
        trace_span span;
        span.trace_id = parent_ctx.trace_id;
        span.span_id = generate_span_id();
        span.parent_span_id = parent_ctx.span_id;
        span.operation_name = "get_user_profile";
        span.service_name = service_name_;
        span.start_time = std::chrono::system_clock::now();
 
        // Inherit baggage
        span.baggage = parent_ctx.baggage;
 
        // Add database query tags
        span.tags["db.system"] = "postgresql";
        span.tags["db.name"] = "users_db";
        span.tags["db.statement"] = "SELECT * FROM users WHERE id = ?";
        span.tags["db.user_id"] = user_id;
 
        std::cout << "   → Created child span: " << span.span_id << std::endl;
        std::cout << "     Parent span: " << span.parent_span_id << std::endl;
 
        // Simulate database query
        std::this_thread::sleep_for(15ms);
 
        span.end_time = std::chrono::system_clock::now();
        span.calculate_duration();
        span.status = trace_span::status_code::ok;
        span.tags["db.rows_returned"] = "1";
 
        std::cout << "   ✓ User profile fetched (duration: "
                  << span.duration.count() << "µs)" << std::endl;
 
        return span;
    }