Setting up a Currency Conversion Microservice involves creating a service that can convert between different currencies based on exchange rates. This microservice typically communicates with other services to fetch exchange rates and perform the conversion. Here’s a step-by-step guide to setting up a Currency Conversion Microservice:
- Use Spring Initializr or your preferred IDE to create a new Spring Boot project.
- Select the necessary dependencies, including Spring Web for RESTful web services and any other dependencies you may need (e.g., Spring Cloud for configuration, Spring Data JPA for data storage, etc.).
Step 2: Define the Domain Model
Create a domain model to represent the currency conversion request and response. For example:
public class CurrencyConversion {
private Long id;
private String from;
private String to;
private BigDecimal quantity;
private BigDecimal conversionRate;
private BigDecimal totalCalculatedAmount;
private int port;
// Getters and setters
}
Step 3: Implement the Currency Conversion Service
Write a service that performs currency conversion. This service should make use of exchange rates, which can be fetched from an external service (e.g., a currency exchange API or a microservice) or from a database.
Step 4: Implement the REST Controller
Create a REST controller that exposes an API for currency conversion. This controller will handle incoming conversion requests and return the converted amount. For example:
@RestController
public class CurrencyConversionController {
@Autowired
private CurrencyConversionService
conversionService;
@GetMapping
("/currency-converter/from/{from}/to
/{to}/quantity/{quantity}")
public CurrencyConversion convertCurrency(
@PathVariable String from,
@PathVariable String to,
@PathVariable BigDecimal quantity
) {
return conversionService.convertCurrency
(from, to, quantity);
}
}
Step 5: Configure Application Properties
In your application.properties or application.yml file, configure properties like server port, external services (if needed), and any other relevant configuration.
Step 6: External Service Integration (Optional)
If you’re fetching exchange rates from an external service, you’ll need to integrate with that service. You can use Spring RestTemplate or WebClient to make HTTP requests to the service’s API.
Step 7: Database Configuration (Optional)
If you’re storing exchange rates or other data, you may need to configure a database. You can use Spring Data JPA for this purpose and define a database schema for your application.
Step 8: Exception Handling and Error Responses
Implement proper error handling and response generation for scenarios such as invalid input or service failures.
Step 9: Run and Test
Run your Currency Conversion Microservice and test it using a tool like Postman or by making HTTP requests from a client application.
Step 10: Documentation
Document your API endpoints and response formats so that other services and developers can understand how to use your microservice.
Step 11: Security and Authorization (Optional)
If your microservice requires security, implement authentication and authorization mechanisms, such as OAuth, JWT, or API keys.
Step 12: Scaling and High Availability (Optional)
Plan for scalability and high availability. You may need to deploy multiple instances of your microservice behind a load balancer.
Step 13: Integration with Other Microservices (Optional)
If your microservice is part of a larger system, integrate it with other microservices, such as a service for fetching exchange rates.
Step 14: Monitoring and Logging (Optional)
Implement monitoring and logging to track the health and performance of your microservice. Tools like Prometheus and Grafana can be useful for this purpose.
Setting up a Currency Conversion Microservice can be straightforward or more complex depending on your specific requirements. Ensure you follow best practices for building, deploying, and maintaining microservices, and consider using a microservices framework like Spring Cloud if you’re working in a distributed environment.
