### Question:
OMAllocateBlockResponse extends OMClientResponse { @Override public void addToDBBatch(OMMetadataManager omMetadataManager, BatchOperation batchOperation) throws IOException { String openKey = omMetadataManager.getOpenKey(omKeyInfo.getVolumeName(), omKeyInfo.getBucketName(), omKeyInfo.getKeyName(), clientID); omMetadataManager.getOpenKeyTable().putWithBatch(batchOperation, openKey, omKeyInfo); omMetadataManager.getVolumeTable().putWithBatch(batchOperation, omMetadataManager.getVolumeKey(omVolumeArgs.getVolume()), omVolumeArgs); omMetadataManager.getBucketTable().putWithBatch(batchOperation, omMetadataManager.getBucketKey(omVolumeArgs.getVolume(), omBucketInfo.getBucketName()), omBucketInfo); } OMAllocateBlockResponse(@Nonnull OMResponse omResponse,
      @Nonnull OmKeyInfo omKeyInfo, long clientID,
      @Nonnull OmVolumeArgs omVolumeArgs, @Nonnull OmBucketInfo omBucketInfo);  OMAllocateBlockResponse(@Nonnull OMResponse omResponse); @Override void addToDBBatch(OMMetadataManager omMetadataManager,
      BatchOperation batchOperation);  }### Answer:
@Test public void testAddToDBBatch() throws Exception { OmKeyInfo omKeyInfo = TestOMRequestUtils.createOmKeyInfo(volumeName, bucketName, keyName, replicationType, replicationFactor); OmVolumeArgs omVolumeArgs = OmVolumeArgs.newBuilder() .setOwnerName(keyName).setAdminName(keyName) .setVolume(volumeName).setCreationTime(Time.now()).build(); OmBucketInfo omBucketInfo = OmBucketInfo.newBuilder() .setVolumeName(volumeName).setBucketName(bucketName) .setCreationTime(Time.now()).build(); OMResponse omResponse = OMResponse.newBuilder() .setAllocateBlockResponse( AllocateBlockResponse.getDefaultInstance()) .setStatus(OzoneManagerProtocolProtos.Status.OK) .setCmdType(OzoneManagerProtocolProtos.Type.AllocateBlock) .build(); OMAllocateBlockResponse omAllocateBlockResponse = new OMAllocateBlockResponse(omResponse, omKeyInfo, clientID, omVolumeArgs, omBucketInfo); String openKey = omMetadataManager.getOpenKey(volumeName, bucketName, keyName, clientID); Assert.assertFalse(omMetadataManager.getOpenKeyTable().isExist(openKey)); omAllocateBlockResponse.addToDBBatch(omMetadataManager, batchOperation); omMetadataManager.getStore().commitBatchOperation(batchOperation); Assert.assertTrue(omMetadataManager.getOpenKeyTable().isExist(openKey)); }