Esempio n. 1
0
  @Override
  public boolean reclaim(
      @NotNull RandomAccessLoggable loggable,
      @NotNull final Iterator<RandomAccessLoggable> loggables) {
    long minAddress = loggable.getAddress();
    while (true) {
      final byte type = loggable.getType();
      if (type < NODE_WO_KEY_WO_VALUE_WO_CHILDREN || type > MAX_VALID_LOGGABLE_TYPE) {
        if (type != NullLoggable.TYPE) { // skip null loggable
          throw new ExodusException("Unexpected loggable type " + loggable.getType());
        }
      } else {
        if (loggable.getStructureId() != structureId) {
          throw new ExodusException("Unexpected structure id " + loggable.getStructureId());
        }
        if (PatriciaTreeBase.nodeIsRoot(type)) {
          break;
        }
      }
      if (!loggables.hasNext()) {
        return false;
      }
      loggable = loggables.next();
    }

    final long maxAddress = loggable.getAddress();
    final PatriciaTreeForReclaim sourceTree =
        new PatriciaTreeForReclaim(log, maxAddress, structureId);
    final ImmutableNode sourceRoot = sourceTree.getRoot();

    final long backRef = sourceTree.getBackRef();
    if (backRef > 0) {
      final long treeStartAddress = sourceTree.getRootAddress() - backRef;
      if (treeStartAddress > minAddress) {
        throw new IllegalStateException("Wrong back reference!");
      }
      if (!log.hasAddressRange(treeStartAddress, maxAddress)) {
        return false;
      }
      minAddress = treeStartAddress;
    }

    final PatriciaReclaimActualTraverser actual = new PatriciaReclaimActualTraverser(this);
    reclaim(new PatriciaReclaimSourceTraverser(sourceTree, sourceRoot, minAddress), actual);
    return actual.wasReclaim || sourceRoot.getAddress() == root.sourceAddress;
  }
Esempio n. 2
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 PatriciaTreeMutable(
     @NotNull final Log log,
     final int structureId,
     final long treeSize,
     @NotNull final ImmutableNode immutableRoot) {
   super(log, structureId);
   size = treeSize;
   root = new MutableRoot(immutableRoot);
   expiredLoggables = null;
   addExpiredLoggable(immutableRoot.getAddress()); // TODO: don't re-read
 }
Esempio n. 3
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 MutableNode mutateNode(@NotNull final ImmutableNode node) {
   addExpiredLoggable(node.getAddress()); // TODO: don't re-read
   return new MutableNode(node);
 }