OpenFeign Client
OpenFeign, EK, DECLARATIVE, HTTP, client, hai — EK, JAVA, INTERFACE, DEFINE, ki, jaati, hai, ANNOTATIONS, ke, saath, (@GetMapping, jaisa) aur, Feign, AUTOMATICALLY, EK, IMPLEMENTATION, GENERATE, kar, deta hai, HTTP, calls, karne, ke, liye.
Feign, Eureka, ke, saath, SEAMLESSLY, INTEGRATE, hota hai — service, NAAM, se, (URL, ki, JAGAH) EK, DUSRI, service, ko, CALL, kiya, ja, sakta hai, LOAD, BALANCING, AUTOMATICALLY, HANDLE, hoti hai.
@FeignClient(name = "inventory-service")
public interface InventoryClient {
@GetMapping("/api/inventory/{productId}")
InventoryDto getInventory(@PathVariable String productId);
}
// Usage:
@Autowired
private InventoryClient inventoryClient;
InventoryDto inv = inventoryClient.getInventory("123"); // feels, jaise, EK, LOCAL, method, call- OpenFeign = declarative, HTTP, client — interface, + annotations, se, HTTP, calls
- Eureka, ke, saath, integrate, hoke, service, naam, se, calls, aur, load, balancing
- Boilerplate, HTTP, client, code, likhne, ki, ZAROORAT, khatam
Feign, mein, ErrorDecoder, interface, IMPLEMENT, karके, CUSTOM, error, handling, ki, ja, sakti hai — HTTP, error, status, codes, ko, CUSTOM, EXCEPTIONS, mein, CONVERT, karne, ke, liye, USEFUL, hai.
public class CustomErrorDecoder implements ErrorDecoder {
public Exception decode(String methodKey, Response response) {
if (response.status() == 404) return new ProductNotFoundException();
return new Exception("Generic error");
}
}Feign, clients, ko, @CircuitBreaker, annotation, ke, saath, COMBINE, kiya, ja, sakta hai — feign, method, calls, ko, AUTOMATICALLY, resilience, patterns, mil, jaate, hain, EXTRA, wrapping, code, ke, bina.