Address code review comments

hapi-fhir-jpaserver-base/src/main/java/ca/uhn/fhir/jpa/batch2/JpaBatch2Config.java

@@ -59,6 +59,6 @@ public class JpaBatch2Config extends BaseBatch2Config {
 	@Bean
 	public IJobPartitionProvider jobPartitionProvider(
 			IRequestPartitionHelperSvc theRequestPartitionHelperSvc, IPartitionLookupSvc thePartitionLookupSvc) {
-		return new JpaPartitionProvider(theRequestPartitionHelperSvc, thePartitionLookupSvc);
+		return new JpaJobPartitionProvider(theRequestPartitionHelperSvc, thePartitionLookupSvc);
 	}
 }

hapi-fhir-jpaserver-base/src/main/java/ca/uhn/fhir/jpa/batch2/JpaJobPartitionProvider.java

@@ -1,6 +1,6 @@
 package ca.uhn.fhir.jpa.batch2;
 
-import ca.uhn.fhir.batch2.coordinator.JobPartitionProvider;
+import ca.uhn.fhir.batch2.api.IJobPartitionProvider;
 import ca.uhn.fhir.interceptor.model.RequestPartitionId;
 import ca.uhn.fhir.jpa.entity.PartitionEntity;
 import ca.uhn.fhir.jpa.partition.IPartitionLookupSvc;
@@ -11,15 +11,18 @@ import java.util.List;
 import java.util.stream.Collectors;
 
 /**
- * The default implementation, which uses {@link IRequestPartitionHelperSvc} and {@link IPartitionLookupSvc} to compute the partition to run a batch2 job.
- * The ladder will be used to handle cases when the job is configured to run against all partitions (bulk system operation).
+ * The default JPA implementation, which uses {@link IRequestPartitionHelperSvc} and {@link IPartitionLookupSvc}
+ * to compute the partition to run a batch2 job.
+ * The latter will be used to handle cases when the job is configured to run against all partitions
+ * (bulk system operation) and will return the actual list with all the configured partitions.
  */
-public class JpaPartitionProvider extends JobPartitionProvider {
+public class JpaJobPartitionProvider implements IJobPartitionProvider {
+	protected final IRequestPartitionHelperSvc myRequestPartitionHelperSvc;
 	private final IPartitionLookupSvc myPartitionLookupSvc;
 
-	public JpaPartitionProvider(
+	public JpaJobPartitionProvider(
 			IRequestPartitionHelperSvc theRequestPartitionHelperSvc, IPartitionLookupSvc thePartitionLookupSvc) {
-		super(theRequestPartitionHelperSvc);
+		myRequestPartitionHelperSvc = theRequestPartitionHelperSvc;
 		myPartitionLookupSvc = thePartitionLookupSvc;
 	}
 

hapi-fhir-jpaserver-base/src/test/java/ca/uhn/fhir/jpa/batch2/JpaJobPartitionProviderTest.java

@@ -27,7 +27,7 @@ public class JpaJobPartitionProviderTest {
 	@Mock
 	private IPartitionLookupSvc myPartitionLookupSvc;
 	@InjectMocks
-	private JpaPartitionProvider myJobPartitionProvider;
+	private JpaJobPartitionProvider myJobPartitionProvider;
 
 	@Test
 	public void getPartitions_requestSpecificPartition_returnsPartition() {

hapi-fhir-storage-batch2-jobs/src/main/java/ca/uhn/fhir/batch2/jobs/imprt/BulkDataImportProvider.java

@@ -159,7 +159,6 @@ public class BulkDataImportProvider {
 		RequestPartitionId partitionId =
 				myRequestPartitionHelperService.determineReadPartitionForRequestForServerOperation(
 						theRequestDetails, JpaConstants.OPERATION_IMPORT);
-		// TODO MM: I believe this is already checked as part of
 		myRequestPartitionHelperService.validateHasPartitionPermissions(theRequestDetails, "Binary", partitionId);
 		jobParameters.setPartitionId(partitionId);
 

hapi-fhir-storage-batch2/src/main/java/ca/uhn/fhir/batch2/api/IJobPartitionProvider.java

@@ -7,7 +7,8 @@ import java.util.List;
 
 /**
  * Provides the list of partitions that a job should run against.
- * TODO MM: Consider moving UrlPartitioner calls to this class once other operations need to be MegaScale enabled.
+ * TODO MM: Consider moving UrlPartitioner calls to this class once other batch operations need to support running
+ * across all partitions on a multitenant FHIR server.
  * That way all partitioning related logic exists only here for batch jobs.
  * After that PartitionedUrl#myRequestPartitionId can be marked as deprecated.
  */

hapi-fhir-storage-batch2/src/main/java/ca/uhn/fhir/batch2/config/BaseBatch2Config.java

@@ -27,8 +27,8 @@ import ca.uhn.fhir.batch2.api.IReductionStepExecutorService;
 import ca.uhn.fhir.batch2.channel.BatchJobSender;
 import ca.uhn.fhir.batch2.coordinator.JobCoordinatorImpl;
 import ca.uhn.fhir.batch2.coordinator.JobDefinitionRegistry;
-import ca.uhn.fhir.batch2.coordinator.JobPartitionProvider;
 import ca.uhn.fhir.batch2.coordinator.ReductionStepExecutorServiceImpl;
+import ca.uhn.fhir.batch2.coordinator.SimpleJobPartitionProvider;
 import ca.uhn.fhir.batch2.coordinator.WorkChunkProcessor;
 import ca.uhn.fhir.batch2.maintenance.JobMaintenanceServiceImpl;
 import ca.uhn.fhir.batch2.model.JobWorkNotificationJsonMessage;
@@ -145,6 +145,6 @@ public abstract class BaseBatch2Config {
 
 	@Bean
 	public IJobPartitionProvider jobPartitionProvider(IRequestPartitionHelperSvc theRequestPartitionHelperSvc) {
-		return new JobPartitionProvider(theRequestPartitionHelperSvc);
+		return new SimpleJobPartitionProvider(theRequestPartitionHelperSvc);
 	}
 }

hapi-fhir-storage-batch2/src/main/java/ca/uhn/fhir/batch2/coordinator/SimpleJobPartitionProvider.java

@@ -7,10 +7,13 @@ import ca.uhn.fhir.rest.api.server.RequestDetails;
 
 import java.util.List;
 
-public class JobPartitionProvider implements IJobPartitionProvider {
+/**
+ * Basic implementation which provides the partition list for a certain request which is composed of a single partition.
+ */
+public class SimpleJobPartitionProvider implements IJobPartitionProvider {
 	protected final IRequestPartitionHelperSvc myRequestPartitionHelperSvc;
 
-	public JobPartitionProvider(IRequestPartitionHelperSvc theRequestPartitionHelperSvc) {
+	public SimpleJobPartitionProvider(IRequestPartitionHelperSvc theRequestPartitionHelperSvc) {
 		myRequestPartitionHelperSvc = theRequestPartitionHelperSvc;
 	}
 

hapi-fhir-storage-batch2/src/test/java/ca/uhn/fhir/batch2/coordinator/SimpleJobPartitionProviderTest.java

@@ -17,11 +17,11 @@ import java.util.List;
 import static org.mockito.Mockito.when;
 
 @ExtendWith(MockitoExtension.class)
-public class JobPartitionProviderTest {
+public class SimpleJobPartitionProviderTest {
 	@Mock
 	private IRequestPartitionHelperSvc myRequestPartitionHelperSvc;
 	@InjectMocks
-	private JobPartitionProvider myJobPartitionProvider;
+	private SimpleJobPartitionProvider myJobPartitionProvider;
 
 	@Test
 	public void getPartitions_requestSpecificPartition_returnsPartition() {