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I am implementing a generic Idempotency handling mechanism in my service using Firestore. However, I encountered a serialization/deserialization issue when dealing with generic types. The absence of GenericTypeIndicator in the Firestore integration for Spring makes it challenging to implement a clean and efficient solution for generic data handling.
@Slf4j@Service@RequiredArgsConstructor(onConstructor = @__(@Autowired))
publicclassIdempotencyService {
privatefinalIdempotencyRepositoryrepository;
public <T> Mono<T> checkIdempotency(StringidempotencyKey, Class<T> type) {
returnrepository.findById(idempotencyKey)
.filter(this::isIdempotencyValid)
.map(Idempotency::getResponse)
.cast(type)
.doOnSuccess(response -> {
if (response != null) {
log.info("Idempotency key {} triggered, returning saved value: {}.", idempotencyKey, response);
} else {
log.info("Idempotency key {} triggered, but no response to return (No value stored or key expired).", idempotencyKey);
}
})
.doOnError(error -> log.error("Error checking idempotency for key {}: {}", idempotencyKey, error.getMessage()));
}
// ... Other generic methods
Problem
2024-04-13 23:24:12.782 [http-nio-0.0.0.0-8084-exec-2] ERROR o.a.c.c.C.[.[.[.[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: java.lang.RuntimeException: Could not deserialize object. Class com.myvrcloud.user.domain.Idempotency has generic type parameters, please use GenericTypeIndicator instead] with root cause
java.lang.RuntimeException: Could not deserialize object. Class com.myvrcloud.user.domain.Idempotency has generic type parameters, please use GenericTypeIndicator instead
Proposed Solution:
I suggest adding GenericTypeIndicator or similar functionality to spring-cloud-gcp-starter-data-firestore to facilitate the handling of generic types. This feature is crucial for developing robust and type-safe applications and would significantly enhance the usability of Firestore with Spring.
Possible Workaround
Currently, I am serializing the generic type to a JSON string and deserializing it manually. While this approach works, it is cumbersome and detracts from the clean, type-safe approach facilitated by Spring Data. Something like:
@Data@NoArgsConstructor@AllArgsConstructor@Document(collectionName = "idempotencies")
publicclassIdempotency {
@DocumentIdprivateStringkey;
@Exclude@Getter(onMethod_ = @Exclude)
@Setter(onMethod_ = @Exclude)
privateStringresponseJson;
privateLocalDateTimeexpiryDate;
@ExcludeprivateObjectresponse;
publicIdempotency(Stringkey, Objectresponse) {
this.key = key;
this.setResponse(response);
}
@PropertyName("response")
publicvoidsetResponse(Objectresponse) {
try {
this.responseJson = JsonUtil.getMapper().writeValueAsString(response);
this.response = response;
} catch (JsonProcessingExceptione) {
thrownewRuntimeException("Failed to serialize response", e);
}
}
@PropertyName("response")
public <T> TgetResponse(Class<T> type) {
try {
returnnewObjectMapper().readValue(this.responseJson, type);
} catch (JsonProcessingExceptione) {
thrownewRuntimeException("Failed to deserialize response", e);
}
}
}
// checkIdempotency method in the Service will need to use the method...repository.findById(idempotencyKey)
.filter(this::isIdempotencyValid)
.map(idempotency -> idempotency.getResponse(type))
//...
Conclusion
The inclusion of generic type handling in Firestore's Spring Data integration would align it with other parts of the Spring ecosystem, which already support generics effectively. This enhancement would greatly simplify the development process and improve code quality (and avoid the need for "workarounds").
The text was updated successfully, but these errors were encountered:
Problem
I am implementing a generic Idempotency handling mechanism in my service using Firestore. However, I encountered a serialization/deserialization issue when dealing with generic types. The absence of GenericTypeIndicator in the Firestore integration for Spring makes it challenging to implement a clean and efficient solution for generic data handling.
Example of Current Implementation:
Domain
Service
Problem
Proposed Solution:
I suggest adding GenericTypeIndicator or similar functionality to
spring-cloud-gcp-starter-data-firestore
to facilitate the handling of generic types. This feature is crucial for developing robust and type-safe applications and would significantly enhance the usability of Firestore with Spring.Possible Workaround
Currently, I am serializing the generic type to a JSON string and deserializing it manually. While this approach works, it is cumbersome and detracts from the clean, type-safe approach facilitated by Spring Data. Something like:
Or something like:
Conclusion
The inclusion of generic type handling in Firestore's Spring Data integration would align it with other parts of the Spring ecosystem, which already support generics effectively. This enhancement would greatly simplify the development process and improve code quality (and avoid the need for "workarounds").
The text was updated successfully, but these errors were encountered: