Adrian Matei (aka adixchen) Reading time ~1 minute

Define a named parameter (:status) in a named query:

import javax.persistence.*;

@Entity
@Access(AccessType.FIELD)
@Table(name = PartnerInitialLoad.TABLE_NAME)
@NamedQueries({
  @NamedQuery(
      name = FIND_PARTNER_BY_STATUS ,
      query =
          "select p from PartnerInitialLoad p where p.status = :status order by p.partnernummer asc")
})
public class PartnerInitialLoad {
  public static final String TABLE_NAME = "T_PARTNER_INITIAL_LOAD";

  public static final String FIND_MAX_PARTNERNUMMER = "findMaxPartnernummer";
  public static final String FIND_PARTNER_BY_STATUS = "findPartnerByStatus";

  public static final String PARAM_STATUS = "status"; //the value here has to match the one in jpql, here "status"

 // further entity details emitted for brevity
}

Then, set the named parameter in the created TypedQuery (em.createNamedQuery) with the setParameter method, which expects the name of the parameter (should match the one defined in the @NamedQuery) and its value:

@Stateless
public class PartnerInitialLoadRepository {

  @Inject private EntityManager em;

  public List<PartnerInitialLoad> getPartnersByStatus(Integer chunkSize, String status) {
    var query =
        em.createNamedQuery(PartnerInitialLoad.FIND_UNPROCESSED_PARTNER, PartnerInitialLoad.class);
    query.setParameter(PartnerInitialLoad.PARAM_STATUS, status);
    query.setMaxResults(chunkSize);

    return query.getResultList();
  }
}

Same principle applies, if we create a collection-valued named parameters, to generate for example a SELECT IN clause sql as in the following snippet:

  public List<PartnerInitialLoad> getPartnersWithStatusInList(Integer chunkSize, List<String> statusList) {
   String sql="select p from PartnerInitialLoad p where p.status IN (:statusList) order by p.partnernummer asc"
    var query =
        em.createQuery(sql, PartnerInitialLoad.class);
    query.setParameter("statusList", status);
    query.setMaxResults(chunkSize);

    return query.getResultList();
  }

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Adrian Matei (aka adixchen) Reading time ~1 minute

Use created(URI location) of the javax.ws.rs.core.Response class. Usually when you return the 201 HTTP Status Code, you should return a location header with the location where the new REST resource is available.

import javax.ejb.Stateless;
import javax.inject.Inject;
import javax.ws.rs.*;
import javax.ws.rs.core.*;

@Path("messages")
@Stateless
@Tag(name = "Message")
public class MessageRestResource {

  @Inject private MessageService messageService;

  @POST
  @Consumes(MediaType.TEXT_PLAIN)
  @Operation(summary = "Create message")
  @ApiResponses({
    @ApiResponse(
        responseCode = "201",
        description = "Message successfully created."),
    @ApiResponse(responseCode = "403", description = "Forbidden")
  })
  public Response createMessage(
      @Parameter(description = "Message") String message, @Context UriInfo uriInfo)
      throws JAXBException {
    Message created = messageService.createMessage(message);
    UriBuilder builder = uriInfo.getAbsolutePathBuilder();
    builder.path(created.getUuid().toString());
    return Response.created(builder.build()).build();
  }

In the snippet the UriBuilder method builder.path(created.getUuid().toString()) appends the identifier of the newly created message (uuid) to the absolute path of the request, which was obtained from the uriInfo

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Adrian Matei (aka adixchen) Reading time ~1 minute

Use the ok() method of the javax.ws.rs.core.Reponse class to create a ReponseBuilder with a status of 200 (OK), or the ok(Object entity) to return OK with data

import javax.ejb.Stateless;
import javax.inject.Inject;
import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

@Path("comparison")
@Stateless
@Tag(name = "Comparison")
public class ComparisonRestResource {

  @Inject private ComparisonService comparisonService;

  @HEAD
  @Operation(
      summary = "Ping HEAD",
      description = "Check availability of the resource. ")
  @ApiResponses(@ApiResponse(responseCode = "200", description = "Service is reachable via HTTP"))
  public Response head() {
    return Response.ok().build();
  }

  @GET
  @Produces(MediaType.TEXT_PLAIN)
  @Operation(
      summary = "Ping GET",
      description = "Check availability of the example resource. ")
  @ApiResponses(@ApiResponse(responseCode = "200", description = "Service is reachable via HTTP"))
  public Response ping() {
    return Response.ok("pong").build();
  }
}

Note that the ok() methods shown before are just shortcuts for

return Response
        .status(Response.Status.OK)
        .build()

and

return Response
        .status(Response.Status.OK)
        .entity("pong")
        .build()

respectively.

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Adrian Matei (aka adixchen) Reading time ~1 minute

If you don’t know exactly the deployment name in the current context you can use the following command to list all deployments:

kubectl get deploy

You should get a list of deployments similar to the following:

NAME                                       READY   UP-TO-DATE   AVAILABLE   AGE
pdv-location-batch-test                    0/1     1            0           2m12s
connector-partner-service                  1/1     1            1           330d

The use kubectl delete deploy <deployment name> to delete the deployment , in our case pdv-location-batch-test

kubectl delete deploy pdv-location-batch-test

You should get something similar to the following:

deployment.apps "pdv-lokation-batch-test" deleted

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Adrian Matei (aka adixchen) Reading time ~1 minute

Use the $ sign to define the variable $variable_name: variable_value. Below we define anthracite-gray colour in the _colors.scss file used in the Codever project. Then we reference the variable in the class definition:

$anthracite-gray: #4A5054;

.anthracite-gray {
  color: $anthracite-gray;
}

Reference - https://sass-lang.com/documentation/variables

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