How to use

builder

method

in

io.pravega.common.util.btree.BTreeIndex

/**
 * Creates a new instance of the SegmentAttributeIndex class.
 *
 * @param segmentMetadata The SegmentMetadata of the Segment whose attributes we want to manage.
 * @param storage         A Storage adapter which can be used to access the Attribute Segment.
 * @param cache           The Cache to use.
 * @param config          Attribute Index Configuration.
 * @param executor        An Executor to run async tasks.
 */
SegmentAttributeBTreeIndex(@NonNull SegmentMetadata segmentMetadata, @NonNull Storage storage, @NonNull Cache cache,
              @NonNull AttributeIndexConfig config, @NonNull ScheduledExecutorService executor) {
  this.segmentMetadata = segmentMetadata;
  this.storage = storage;
  this.cache = cache;
  this.config = config;
  this.executor = executor;
  this.handle = new AtomicReference<>();
  this.index = BTreeIndex.builder()
              .keyLength(KEY_LENGTH)
              .valueLength(VALUE_LENGTH)
              .maxPageSize(this.config.getMaxIndexPageSize())
              .executor(this.executor)
              .getLength(this::getLength)
              .readPage(this::readPage)
              .writePages(this::writePages)
              .build();
  this.cacheEntries = new HashMap<>();
  this.traceObjectId = String.format("AttributeIndex[%s]", this.segmentMetadata.getId());
  this.closed = new AtomicBoolean();
}

private BTreeIndex.BTreeIndexBuilder defaultBuilder(DataSource ds) {
  return BTreeIndex.builder()
      .maxPageSize(MAX_PAGE_SIZE)
      .keyLength(KEY_LENGTH)
      .valueLength(VALUE_LENGTH)
      .readPage(ds::read)
      .writePages(ds::write)
      .getLength(ds::getLength)
      .executor(executorService());
}