How to use

HollowFilesystemBlobStorageCleaner

in

com.netflix.hollow.api.producer.fs

/**
 * Cleans snapshot to keep the last 'n' snapshots. Defaults to 5.
 */
@Override
public void cleanSnapshots() {
  File[] files = getFilesByType(HollowProducer.Blob.Type.SNAPSHOT.prefix);
  if(files == null || files.length <= numOfSnapshotsToKeep) {
    return;
  }
  sortByLastModified(files);
  for(int i= numOfSnapshotsToKeep; i < files.length; i++){
    File file = files[i];
    boolean deleted = file.delete();
    if(!deleted) {
      log.warning("Could not delete snapshot " + file.getPath());
    }
  }
}

@Test
public void cleanSnapshotsWithDefaultValue() {
  HollowProducer.Publisher publisher = new HollowFilesystemPublisher(publishDir.toPath());
  HollowProducer.BlobStorageCleaner blobStorageCleaner = new HollowFilesystemBlobStorageCleaner(publishDir);
  HollowProducer producer = HollowProducer.withPublisher(publisher)
                      .withBlobStorageCleaner(blobStorageCleaner)