# Requirements Traceability Matrix
## HTTP Sender Plugin (HSP) - Bidirectional Traceability

**Document Version:** 1.0
**Date:** 2025-11-19
**Status:** Design Phase

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## Table of Contents
1. [Architecture Requirements](#architecture-requirements)
2. [Functional Requirements](#functional-requirements)
3. [Non-Functional Requirements](#non-functional-requirements)
4. [Normative Requirements](#normative-requirements)
5. [User Stories](#user-stories)

---

## Architecture Requirements

| Req ID | Category | Description | Architecture Component | Java Package/Class | Test Class | Verification Method | Status |
|--------|----------|-------------|----------------------|-------------------|------------|-------------------|--------|
| Req-Arch-1 | Architecture | OpenJDK 25, Java 25 | Build System | pom.xml | N/A | Build config review, compiler version check | Designed |
| Req-Arch-2 | Architecture | External libraries: gRPC Java 1.60+, Protobuf 3.25+ only | Build System, Dependency Management | pom.xml dependencies | DependencyValidationTest | Dependency analysis, license check | Designed |
| Req-Arch-3 | Architecture | Log to hsp.log in temp directory | Logging Infrastructure | com.siemens.hsp.adapter.outbound.logging.FileLoggerAdapter | LoggerAdapterTest | Integration test with file verification | Designed |
| Req-Arch-4 | Architecture | Java Logging API with rotation (100MB, 5 files) | Logging Infrastructure | com.siemens.hsp.adapter.outbound.logging.LoggingConfiguration | LoggingConfigurationTest | Unit test, file rotation validation | Designed |
| Req-Arch-5 | Architecture | Always run unless unrecoverable error | Main Application Loop | com.siemens.hsp.HspApplication (main) | ApplicationLifecycleTest | Integration test with failure scenarios | Designed |
| Req-Arch-6 | Architecture | Multi-threaded: HTTP polling (virtual threads), gRPC transmission | Core Domain Services | com.siemens.hsp.application.HttpPollingService<br/>com.siemens.hsp.application.GrpcTransmissionService | HttpPollingServiceTest<br/>GrpcTransmissionServiceTest | Multi-threading integration test | Designed |
| Req-Arch-7 | Architecture | Producer-Consumer pattern (IF1 to IF2) | Core Domain | com.siemens.hsp.domain.DataBuffer<br/>com.siemens.hsp.application.DataFlowCoordinator | DataBufferTest<br/>DataFlowCoordinatorTest | Unit test, pattern validation | Designed |
| Req-Arch-8 | Architecture | Thread-safe collections for buffering | Core Domain | com.siemens.hsp.domain.DataBuffer (using ConcurrentLinkedQueue) | DataBufferConcurrencyTest | Concurrency test with multiple threads | Designed |

---

## Functional Requirements

### Initialization and Startup (Req-FR-1 to Req-FR-8)

| Req ID | Category | Description | Architecture Component | Java Package/Class | Test Class | Verification Method | Status |
|--------|----------|-------------|----------------------|-------------------|------------|-------------------|--------|
| Req-FR-1 | Functional | Execute startup sequence | Application Orchestration | com.siemens.hsp.HspApplication | ApplicationStartupTest | Integration test with full startup | Designed |
| Req-FR-2 | Functional | Startup step 1: Load and validate configuration | Configuration Port (Inbound) | com.siemens.hsp.adapter.inbound.config.ConfigurationLoader<br/>com.siemens.hsp.domain.Configuration | ConfigurationLoaderTest<br/>ConfigurationValidatorTest | Unit test with valid/invalid configs | Designed |
| Req-FR-3 | Functional | Startup step 2: Initialize logging | Logging Port (Outbound) | com.siemens.hsp.adapter.outbound.logging.FileLoggerAdapter | LoggerAdapterTest | Unit test, log file creation check | Designed |
| Req-FR-4 | Functional | Startup step 3: Establish gRPC connection | gRPC Port (Outbound) | com.siemens.hsp.adapter.outbound.grpc.GrpcClientAdapter | GrpcClientAdapterTest | Integration test with mock gRPC server | Designed |
| Req-FR-5 | Functional | Startup step 4: Begin HTTP polling | HTTP Polling Service | com.siemens.hsp.application.HttpPollingService | HttpPollingServiceTest | Integration test with mock HTTP server | Designed |
| Req-FR-6 | Functional | gRPC retry: every 5s, log warnings every 1 min | Connection Management | com.siemens.hsp.adapter.outbound.grpc.ConnectionManager | ConnectionManagerTest | Unit test with timing validation | Designed |
| Req-FR-7 | Functional | No HTTP polling until gRPC connected | Application Orchestration | com.siemens.hsp.HspApplication | StartupSequenceTest | Integration test with connection delays | Designed |
| Req-FR-8 | Functional | Log "HSP started successfully" at INFO | Application Orchestration | com.siemens.hsp.HspApplication | ApplicationStartupTest | Log output validation | Designed |

### Configuration Management (Req-FR-9 to Req-FR-13)

| Req ID | Category | Description | Architecture Component | Java Package/Class | Test Class | Verification Method | Status |
|--------|----------|-------------|----------------------|-------------------|------------|-------------------|--------|
| Req-FR-9 | Functional | Configurable via configuration file | Configuration Port | com.siemens.hsp.domain.ports.inbound.ConfigurationPort<br/>com.siemens.hsp.adapter.inbound.config.JsonConfigurationAdapter | ConfigurationPortTest<br/>JsonConfigurationAdapterTest | Unit test with sample configs | Designed |
| Req-FR-10 | Functional | Read config file from application directory at startup | Configuration Adapter | com.siemens.hsp.adapter.inbound.config.ConfigurationLoader | ConfigurationLoaderTest | Integration test with file I/O | Designed |
| Req-FR-11 | Functional | Validate all configuration parameters | Domain Validation | com.siemens.hsp.domain.ConfigurationValidator | ConfigurationValidatorTest | Unit test with boundary values | Designed |
| Req-FR-12 | Functional | Terminate with error code 1 on validation failure | Application Main | com.siemens.hsp.HspApplication | ConfigurationFailureTest | Integration test with exit code check | Designed |
| Req-FR-13 | Functional | Log validation failure reason | Logging | com.siemens.hsp.domain.ConfigurationValidator | ConfigurationValidatorTest | Log output validation | Designed |

### HTTP Polling (IF1) (Req-FR-14 to Req-FR-26)

| Req ID | Category | Description | Architecture Component | Java Package/Class | Test Class | Verification Method | Status |
|--------|----------|-------------|----------------------|-------------------|------------|-------------------|--------|
| Req-FR-14 | Functional | Establish connection to configured devices (IF1) | HTTP Client Port | com.siemens.hsp.adapter.outbound.http.HttpClientAdapter | HttpClientAdapterTest | Integration test with mock HTTP endpoints | Designed |
| Req-FR-15 | Functional | 30 second timeout for HTTP GET | HTTP Client | com.siemens.hsp.adapter.outbound.http.HttpClientAdapter | HttpClientTimeoutTest | Integration test with delayed responses | Designed |
| Req-FR-16 | Functional | Poll at configured intervals | HTTP Polling Service | com.siemens.hsp.application.HttpPollingService | HttpPollingIntervalTest | Integration test with timing validation | Designed |
| Req-FR-17 | Functional | Retry 3 times with 5-second intervals | Retry Logic | com.siemens.hsp.adapter.outbound.http.RetryHandler | RetryHandlerTest | Unit test with failure simulation | Designed |
| Req-FR-18 | Functional | Linear backoff: 5s to 300s, +5s per attempt | Backoff Strategy | com.siemens.hsp.adapter.outbound.http.BackoffStrategy | BackoffStrategyTest | Unit test with timing calculations | Designed |
| Req-FR-19 | Functional | No concurrent connections to same endpoint | Connection Pool | com.siemens.hsp.adapter.outbound.http.EndpointConnectionPool | EndpointConnectionPoolTest | Concurrency test | Designed |
| Req-FR-20 | Functional | Continue polling other endpoints if one fails | Fault Isolation | com.siemens.hsp.application.HttpPollingService | FaultIsolationTest | Integration test with partial failures | Designed |
| Req-FR-21 | Functional | Reject files larger than 1MB, log warning | Data Validation | com.siemens.hsp.domain.DiagnosticDataValidator | DataValidatorTest | Unit test with oversized data | Designed |
| Req-FR-22 | Functional | Wrap collected data in JSON | Data Serialization | com.siemens.hsp.domain.JsonDataSerializer | JsonDataSerializerTest | Unit test with serialization validation | Designed |
| Req-FR-23 | Functional | Encode binary as Base64 in JSON | Data Encoding | com.siemens.hsp.domain.JsonDataSerializer | Base64EncodingTest | Unit test with binary data | Designed |
| Req-FR-24 | Functional | JSON includes: plugin_name, timestamp (ISO 8601), source_endpoint, data_size, payload | JSON Structure | com.siemens.hsp.domain.DiagnosticData (value object) | DiagnosticDataTest | Unit test with JSON schema validation | Designed |
| Req-FR-25 | Functional | Send data to Collector Sender Core | gRPC Transmission | com.siemens.hsp.application.GrpcTransmissionService | GrpcTransmissionServiceTest | Integration test with mock gRPC | Designed |
| Req-FR-25 (dup) | Functional | Buffer data in memory on transmission failure (max 300) | Data Buffer | com.siemens.hsp.domain.DataBuffer | DataBufferTest | Unit test with buffer overflow | Designed |
| Req-FR-26 | Functional | Discard oldest data when buffer full | Buffer Management | com.siemens.hsp.domain.DataBuffer | DataBufferOverflowTest | Unit test with FIFO validation | Designed |

### gRPC Communication (IF2) (Req-FR-27 to Req-FR-32)

| Req ID | Category | Description | Architecture Component | Java Package/Class | Test Class | Verification Method | Status |
|--------|----------|-------------|----------------------|-------------------|------------|-------------------|--------|
| Req-FR-27 | Functional | Communicate via Interface IF2 | gRPC Port | com.siemens.hsp.adapter.outbound.grpc.GrpcClientAdapter<br/>com.siemens.coreshield.owg.shared.grpc.TransferService* | GrpcClientAdapterTest | Integration test with protobuf validation | Designed |
| Req-FR-28 | Functional | Single bidirectional gRPC stream at startup | gRPC Stream Management | com.siemens.hsp.adapter.outbound.grpc.StreamManager | StreamManagerTest | Integration test with stream lifecycle | Designed |
| Req-FR-29 | Functional | On stream failure: close, wait 5s, re-establish | Connection Recovery | com.siemens.hsp.adapter.outbound.grpc.ConnectionManager | ConnectionRecoveryTest | Integration test with connection drops | Designed |
| Req-FR-30 | Functional | Send TransferRequest with max 4MB data | Message Batching | com.siemens.hsp.application.GrpcTransmissionService | MessageBatchingTest | Unit test with size calculations | Designed |
| Req-FR-31 | Functional | Send batch within 1s if not reaching 4MB | Message Timing | com.siemens.hsp.application.GrpcTransmissionService | MessageTimingTest | Integration test with timing validation | Designed |
| Req-FR-32 | Functional | Set receiver_id to 99 for all requests | Protocol Constants | com.siemens.hsp.adapter.outbound.grpc.GrpcClientAdapter | GrpcClientAdapterTest | Unit test with message inspection | Designed |

---

## Non-Functional Requirements

### Performance (Req-NFR-1 to Req-NFR-2)

| Req ID | Category | Description | Architecture Component | Java Package/Class | Test Class | Verification Method | Status |
|--------|----------|-------------|----------------------|-------------------|------------|-------------------|--------|
| Req-NFR-1 | Performance | Support 1000 concurrent HTTP endpoints | Scalability Architecture | com.siemens.hsp.application.HttpPollingService (virtual threads) | PerformanceScalabilityTest | Load test with 1000 endpoints | Designed |
| Req-NFR-2 | Performance | Memory usage not exceed 4096MB | Resource Management | Application-wide monitoring | MemoryUsageTest | Integration test with memory profiling | Designed |

### Security (Req-NFR-3 to Req-NFR-4)

| Req ID | Category | Description | Architecture Component | Java Package/Class | Test Class | Verification Method | Status |
|--------|----------|-------------|----------------------|-------------------|------------|-------------------|--------|
| Req-NFR-3 | Security | No HTTP authentication | HTTP Client Configuration | com.siemens.hsp.adapter.outbound.http.HttpClientAdapter | SecurityConfigTest | Code review, configuration validation | Designed |
| Req-NFR-4 | Security | TCP mode only for gRPC | gRPC Configuration | com.siemens.hsp.adapter.outbound.grpc.GrpcClientAdapter | GrpcSecurityTest | Configuration validation | Designed |

### Usability (Req-NFR-5 to Req-NFR-6)

| Req ID | Category | Description | Architecture Component | Java Package/Class | Test Class | Verification Method | Status |
|--------|----------|-------------|----------------------|-------------------|------------|-------------------|--------|
| Req-NFR-5 | Usability | Built with Maven 3.9+ | Build System | pom.xml | N/A | Build process validation | Designed |
| Req-NFR-6 | Usability | Packaged as executable fat JAR | Build Configuration | pom.xml (maven-shade-plugin) | JarPackagingTest | Build artifact inspection | Designed |

### Reliability (Req-NFR-7 to Req-NFR-8)

| Req ID | Category | Description | Architecture Component | Java Package/Class | Test Class | Verification Method | Status |
|--------|----------|-------------|----------------------|-------------------|------------|-------------------|--------|
| Req-NFR-7 | Reliability | Health check endpoint on localhost:8080/health | Health Check Port (Inbound) | com.siemens.hsp.adapter.inbound.health.HealthCheckAdapter | HealthCheckAdapterTest | Integration test with HTTP requests | Designed |
| Req-NFR-8 | Reliability | Health check JSON: service_status, last_collection, gRPC status, error counts, success/fail counts (30s) | Health Monitoring | com.siemens.hsp.application.HealthMonitoringService | HealthMonitoringServiceTest | Integration test with JSON validation | Designed |

### Testing (Req-NFR-7 to Req-NFR-10) - Note: Duplicate numbering in source

| Req ID | Category | Description | Architecture Component | Java Package/Class | Test Class | Verification Method | Status |
|--------|----------|-------------|----------------------|-------------------|------------|-------------------|--------|
| Req-NFR-7 (Testing) | Testing | Integration test: HTTP collection with mock server | Test Infrastructure | N/A | HttpCollectionIntegrationTest | JUnit 5 test execution | Designed |
| Req-NFR-8 (Testing) | Testing | Integration test: gRPC transmission with mock server | Test Infrastructure | N/A | GrpcTransmissionIntegrationTest | JUnit 5 test execution | Designed |
| Req-NFR-9 | Testing | Use JUnit 5 and Mockito frameworks | Test Framework | pom.xml test dependencies | N/A | Build configuration review | Designed |
| Req-NFR-10 | Testing | Tests executable via 'mvn test' | Build System | pom.xml | N/A | Maven build validation | Designed |

---

## Normative Requirements

| Req ID | Category | Description | Architecture Component | Java Package/Class | Test Class | Verification Method | Status |
|--------|----------|-------------|----------------------|-------------------|------------|-------------------|--------|
| Req-Norm-1 | Normative | ISO-9001 compliance | Quality Management Process | All modules | N/A | Process audit, documentation review | Designed |
| Req-Norm-2 | Normative | Cenelec EN 50716 Basic Integrity | Safety Standards | All modules | N/A | Safety analysis, code review | Designed |
| Req-Norm-3 | Normative | Error detection and handling (invalid data, timeouts, faults) | Error Handling Architecture | com.siemens.hsp.domain.ErrorHandler<br/>All adapters | ErrorHandlingTest<br/>TimeoutHandlingTest | Integration test with fault injection | Designed |
| Req-Norm-4 | Normative | Rigorous testing: unit, integration, validation | Test Strategy | Test suite across all packages | All test classes | Test coverage analysis (target: 80%+) | Designed |
| Req-Norm-5 | Normative | Document development process (requirements, design, implementation, testing) | Documentation | docs/ folder structure | N/A | Documentation completeness review | Designed |
| Req-Norm-6 | Normative | Maintainable design: clear code, modular architecture | Code Quality | Hexagonal architecture pattern | N/A | Code review, architecture review | Designed |

---

## User Stories

| Req ID | Category | Description | Architecture Component | Java Package/Class | Test Class | Verification Method | Status |
|--------|----------|-------------|----------------------|-------------------|------------|-------------------|--------|
| Req-US-1a | User Story | System operator: automatic collection every second for real-time monitoring | HTTP Polling Service | com.siemens.hsp.application.HttpPollingService | HttpPollingServiceTest | Integration test with timing validation | Designed |
| Req-US-1b | User Story | Data analyst: reliable transmission via gRPC with buffering | Data Flow Coordination | com.siemens.hsp.application.DataFlowCoordinator<br/>com.siemens.hsp.domain.DataBuffer | DataFlowCoordinatorTest<br/>DataBufferTest | Integration test with network failures | Designed |
| Req-US-1c | User Story | System administrator: check health status via HTTP endpoint | Health Check Port | com.siemens.hsp.adapter.inbound.health.HealthCheckAdapter | HealthCheckAdapterTest | Integration test with health endpoint | Designed |

---

## Hexagonal Architecture Mapping

### Core Domain (Business Logic)
- **Value Objects**: DiagnosticData, Configuration, HealthStatus
- **Entities**: N/A (stateless service)
- **Services**: DataBuffer, ConfigurationValidator, JsonDataSerializer, DiagnosticDataValidator
- **Domain Ports**: ConfigurationPort, DataCollectionPort, DataTransmissionPort, HealthStatusPort

### Application Layer (Use Cases)
- **Services**: HttpPollingService, GrpcTransmissionService, DataFlowCoordinator, HealthMonitoringService
- **Orchestration**: HspApplication (main)

### Adapters (Infrastructure)

#### Inbound Adapters (Driving)
- **Configuration**: JsonConfigurationAdapter, ConfigurationLoader
- **Health Check**: HealthCheckAdapter (HTTP endpoint)

#### Outbound Adapters (Driven)
- **HTTP Client**: HttpClientAdapter, RetryHandler, BackoffStrategy, EndpointConnectionPool
- **gRPC Client**: GrpcClientAdapter, StreamManager, ConnectionManager
- **Logging**: FileLoggerAdapter, LoggingConfiguration

---

## Package Structure

```
com.siemens.hsp/
├── HspApplication.java                    # Main entry point
├── domain/                                # Core domain (no dependencies)
│   ├── DiagnosticData.java               # Value object
│   ├── Configuration.java                # Value object
│   ├── HealthStatus.java                 # Value object
│   ├── DataBuffer.java                   # Thread-safe buffer
│   ├── ConfigurationValidator.java       # Validation logic
│   ├── JsonDataSerializer.java           # JSON serialization
│   ├── DiagnosticDataValidator.java      # Data validation
│   └── ports/
│       ├── inbound/
│       │   ├── ConfigurationPort.java
│       │   └── HealthStatusPort.java
│       └── outbound/
│           ├── DataCollectionPort.java
│           ├── DataTransmissionPort.java
│           └── LoggingPort.java
├── application/                          # Use case orchestration
│   ├── HttpPollingService.java
│   ├── GrpcTransmissionService.java
│   ├── DataFlowCoordinator.java
│   └── HealthMonitoringService.java
└── adapter/
    ├── inbound/
    │   ├── config/
    │   │   ├── JsonConfigurationAdapter.java
    │   │   └── ConfigurationLoader.java
    │   └── health/
    │       └── HealthCheckAdapter.java
    └── outbound/
        ├── http/
        │   ├── HttpClientAdapter.java
        │   ├── RetryHandler.java
        │   ├── BackoffStrategy.java
        │   └── EndpointConnectionPool.java
        ├── grpc/
        │   ├── GrpcClientAdapter.java
        │   ├── StreamManager.java
        │   └── ConnectionManager.java
        └── logging/
            ├── FileLoggerAdapter.java
            └── LoggingConfiguration.java
```

---

## Generated Protobuf Classes

```
com.siemens.coreshield.owg.shared.grpc/
├── TransferServiceGrpc.java              # Generated service stub
├── TransferRequest.java                  # Generated message
└── TransferResponse.java                 # Generated message
```

---

## Summary Statistics

- **Total Requirements**: 56 unique requirements
  - Architecture Requirements: 8
  - Functional Requirements: 32
  - Non-Functional Requirements: 10
  - Normative Requirements: 6
  - User Stories: 3 (decomposed from 1)

- **Java Classes (Estimated)**: 32 production classes
- **Test Classes (Estimated)**: 35+ test classes
- **Test Coverage Target**: 80%+ line coverage

- **Requirements by Status**:
  - Designed: 56 (100%)
  - Implemented: 0 (0%)
  - Tested: 0 (0%)
  - Verified: 0 (0%)

---

## Notes

1. **Duplicate Requirement IDs**: Req-FR-25 appears twice in source document (data transmission and buffering). Both mapped separately.
2. **Testing Requirements Numbering**: Req-NFR-7 and Req-NFR-8 appear twice (reliability and testing). Disambiguated in matrix.
3. **User Story Decomposition**: Req-US-1 contains three distinct user stories, decomposed as Req-US-1a, Req-US-1b, Req-US-1c.
4. **Hexagonal Architecture**: Design follows ports and adapters pattern for clean dependency management.
5. **Virtual Threads (Java 21+)**: Req-Arch-6 leverages Project Loom for efficient concurrent HTTP polling.
6. **Protobuf Generation**: IF2 protobuf classes generated from provided .proto schema.

---

**Next Steps**:
1. Architecture design review and approval
2. Detailed class design for core domain
3. Test-driven implementation (TDD)
4. Integration testing with mock servers
5. Performance validation with 1000 endpoints
6. Security audit and normative compliance review