DIGIT CORE
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Implementing Service layer
The Service layer performs business logic on the RequestData and prepares the Response to be returned back to the client.
For this guide, to create the service layer -
  1. 1.
    Create a new package called service.
  2. 2.
    Create a new class in this folder by the name BirthRegistrationService.
  3. 3.
    Annotate the class with @Service annotation.
  4. 4.
    Add the following content to the class -
package digit.service;
import digit.enrichment.BirthApplicationEnrichment;
import digit.kafka.Producer;
import digit.repository.BirthRegistrationRepository;
import digit.validators.BirthApplicationValidator;
import digit.web.models.BirthApplicationSearchCriteria;
import digit.web.models.BirthRegistrationApplication;
import digit.web.models.BirthRegistrationRequest;
import digit.web.models.FatherApplicant;
import lombok.extern.slf4j.Slf4j;
import org.egov.common.contract.request.RequestInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
@Service
@Slf4j
public class BirthRegistrationService {
@Autowired
private BirthApplicationValidator validator;
@Autowired
private BirthApplicationEnrichment enrichmentUtil;
@Autowired
private UserService userService;
@Autowired
private WorkflowService workflowService;
@Autowired
private BirthRegistrationRepository birthRegistrationRepository;
@Autowired
private Producer producer;
public List<BirthRegistrationApplication> registerBtRequest(BirthRegistrationRequest birthRegistrationRequest) {
// Validate applications
validator.validateBirthApplication(birthRegistrationRequest);
// Enrich applications
enrichmentUtil.enrichBirthApplication(birthRegistrationRequest);
// Enrich/Upsert user in upon birth registration
userService.callUserService(birthRegistrationRequest);
// Initiate workflow for the new application
workflowService.updateWorkflowStatus(birthRegistrationRequest);
// Push the application to the topic for persister to listen and persist
producer.push("save-bt-application", birthRegistrationRequest);
// Return the response back to user
return birthRegistrationRequest.getBirthRegistrationApplications();
}
public List<BirthRegistrationApplication> searchBtApplications(RequestInfo requestInfo, BirthApplicationSearchCriteria birthApplicationSearchCriteria) {
// Fetch applications from database according to the given search criteria
List<BirthRegistrationApplication> applications = birthRegistrationRepository.getApplications(birthApplicationSearchCriteria);
// If no applications are found matching the given criteria, return an empty list
if(CollectionUtils.isEmpty(applications))
return new ArrayList<>();
// Enrich mother and father of applicant objects
applications.forEach(application -> {
enrichmentUtil.enrichFatherApplicantOnSearch(application);
enrichmentUtil.enrichMotherApplicantOnSearch(application);
});
// Otherwise return the found applications
return applications;
}
public BirthRegistrationApplication updateBtApplication(BirthRegistrationRequest birthRegistrationRequest) {
// Validate whether the application that is being requested for update indeed exists
BirthRegistrationApplication existingApplication = validator.validateApplicationExistence(birthRegistrationRequest.getBirthRegistrationApplications().get(0));
existingApplication.setWorkflow(birthRegistrationRequest.getBirthRegistrationApplications().get(0).getWorkflow());
log.info(existingApplication.toString());
birthRegistrationRequest.setBirthRegistrationApplications(Collections.singletonList(existingApplication));
// Enrich application upon update
enrichmentUtil.enrichBirthApplicationUponUpdate(birthRegistrationRequest);
workflowService.updateWorkflowStatus(birthRegistrationRequest);
// Just like create request, update request will be handled asynchronously by the persister
producer.push("update-bt-application", birthRegistrationRequest);
return birthRegistrationRequest.getBirthRegistrationApplications().get(0);
}
}
*** NOTE: At this point, your IDE must be showing a lot of errors but do not worry we will add all dependent layers as we progress through this guide and the errors will go away.
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