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Lock-free document store—optimized for high rate atomic state changes—that concurrently commits and compacts on-disk log-structured storage files without blocking parallel in-memory updates to associative B-tree maps, spatial Q-tree maps, sequential S-tree lists, and singleton U-tree values

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// Copyright 2015-2020 SWIM.AI inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package swim.db;

import swim.structure.Value;
import swim.util.OrderedMapCursor;

final class BTreeNodeDeltaCursor extends BTreeNodeCursor {

  final long sinceVersion;

  BTreeNodeDeltaCursor(BTreeNode page, long index, int childIndex, long sinceVersion) {
    super(page, index, childIndex);
    this.sinceVersion = sinceVersion;
  }

  BTreeNodeDeltaCursor(BTreeNode page, long sinceVersion) {
    this(page, 0L, 0, sinceVersion);
  }

  @Override
  OrderedMapCursor childCursor(BTreePageRef childRef) {
    return childRef.deltaCursor(this.sinceVersion);
  }

}