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SirixDB is a hybrid on-disk and in-memory document oriented, versioned database system. It has a lightweight buffer manager, stores everything in a huge persistent and durable tree and allows efficient reconstruction of every revision. Furthermore, SirixDB implements change tracking, diffing and supports time travel queries.

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package org.sirix.cache;

import org.sirix.index.redblacktree.RBNode;
import org.sirix.page.PageReference;
import org.sirix.page.RevisionRootPage;
import org.sirix.page.interfaces.Page;

public final class BufferManagerImpl implements BufferManager {
  private final PageCache pageCache;

  private final RecordPageCache recordPageCache;

  private final RevisionRootPageCache revisionRootPageCache;

  private final RedBlackTreeNodeCache redBlackTreeNodeCache;

  public BufferManagerImpl(final int maxPageCacheSize, final int maxRecordPageCacheSize,
      final int maxRevisionRootPageCache, final int maxRBTreeNodeCache) {
    pageCache = new PageCache(maxPageCacheSize);
    recordPageCache = new RecordPageCache(maxRecordPageCacheSize);
    revisionRootPageCache = new RevisionRootPageCache(maxRevisionRootPageCache);
    redBlackTreeNodeCache = new RedBlackTreeNodeCache(maxRBTreeNodeCache);
  }

  @Override
  public Cache getPageCache() {
    return pageCache;
  }

  @Override
  public Cache getRecordPageCache() {
    return recordPageCache;
  }

  @Override
  public Cache getRevisionRootPageCache() {
    return revisionRootPageCache;
  }

  @Override
  public Cache> getIndexCache() {
    return redBlackTreeNodeCache;
  }

  @Override
  public void close() {
    pageCache.clear();
    recordPageCache.clear();
    revisionRootPageCache.clear();
    redBlackTreeNodeCache.clear();
  }
}