Java Snapshot.CURRENT_STATE_ID属性代码示例

/**
 * Undo the rename operation for the dst tree, i.e., if the rename operation
 * (with OVERWRITE option) removes a file/dir from the dst tree, add it back
 * and delete possible record in the deleted list.  
 */
public void undoRename4DstParent(final BlockStoragePolicySuite bsps,
    final INode deletedChild,
    int latestSnapshotId) throws QuotaExceededException {
  DirectoryWithSnapshotFeature sf = getDirectoryWithSnapshotFeature();
  Preconditions.checkState(sf != null,
      "Directory does not have snapshot feature");
  boolean removeDeletedChild = sf.getDiffs().removeChild(ListType.DELETED,
      deletedChild);
  int sid = removeDeletedChild ? Snapshot.CURRENT_STATE_ID : latestSnapshotId;
  final boolean added = addChild(deletedChild, true, sid);
  // update quota usage if adding is successfully and the old child has not
  // been stored in deleted list before
  if (added && !removeDeletedChild) {
    final QuotaCounts counts = deletedChild.computeQuotaUsage(bsps);
    addSpaceConsumed(counts, false);

  }
}
 

@Override
public final QuotaCounts computeQuotaUsage(BlockStoragePolicySuite bsps,
    byte blockStoragePolicyId, QuotaCounts counts, boolean useCache,
    int lastSnapshotId) {
  // if this.lastSnapshotId < lastSnapshotId, the rename of the referred 
  // node happened before the rename of its ancestor. This should be 
  // impossible since for WithName node we only count its children at the 
  // time of the rename. 
  Preconditions.checkState(lastSnapshotId == Snapshot.CURRENT_STATE_ID
      || this.lastSnapshotId >= lastSnapshotId);
  final INode referred = this.getReferredINode().asReference()
      .getReferredINode();
  // We will continue the quota usage computation using the same snapshot id
  // as time line (if the given snapshot id is valid). Also, we cannot use 
  // cache for the referred node since its cached quota may have already 
  // been updated by changes in the current tree.
  int id = lastSnapshotId != Snapshot.CURRENT_STATE_ID ? 
      lastSnapshotId : this.lastSnapshotId;
  return referred.computeQuotaUsage(bsps, blockStoragePolicyId, counts,
      false, id);
}
 

private int getSelfSnapshot(final int prior) {
  WithCount wc = (WithCount) getReferredINode().asReference();
  INode referred = wc.getReferredINode();
  int lastSnapshot = Snapshot.CURRENT_STATE_ID;
  if (referred.isFile() && referred.asFile().isWithSnapshot()) {
    lastSnapshot = referred.asFile().getDiffs().getLastSnapshotId();
  } else if (referred.isDirectory()) {
    DirectoryWithSnapshotFeature sf = referred.asDirectory()
        .getDirectoryWithSnapshotFeature();
    if (sf != null) {
      lastSnapshot = sf.getLastSnapshotId();
    }
  }
  if (lastSnapshot != Snapshot.CURRENT_STATE_ID && lastSnapshot != prior) {
    return lastSnapshot;
  } else {
    return Snapshot.CURRENT_STATE_ID;
  }
}
 

/** Call cleanSubtree(..) recursively down the subtree. */
public QuotaCounts cleanSubtreeRecursively(final BlockStoragePolicySuite bsps,
    final int snapshot,
    int prior, final BlocksMapUpdateInfo collectedBlocks,
    final List<INode> removedINodes, final Map<INode, INode> excludedNodes) {
  QuotaCounts counts = new QuotaCounts.Builder().build();
  // in case of deletion snapshot, since this call happens after we modify
  // the diff list, the snapshot to be deleted has been combined or renamed
  // to its latest previous snapshot. (besides, we also need to consider nodes
  // created after prior but before snapshot. this will be done in 
  // DirectoryWithSnapshotFeature)
  int s = snapshot != Snapshot.CURRENT_STATE_ID
      && prior != Snapshot.NO_SNAPSHOT_ID ? prior : snapshot;
  for (INode child : getChildrenList(s)) {
    if (snapshot != Snapshot.CURRENT_STATE_ID && excludedNodes != null
        && excludedNodes.containsKey(child)) {
      continue;
    } else {
      QuotaCounts childCounts = child.cleanSubtree(bsps, snapshot, prior,
          collectedBlocks, removedINodes);
      counts.add(childCounts);
    }
  }
  return counts;
}
 

/** Is this inode in the latest snapshot? */
public final boolean isInLatestSnapshot(final int latestSnapshotId) {
  if (latestSnapshotId == Snapshot.CURRENT_STATE_ID || latestSnapshotId == Snapshot.NO_SNAPSHOT_ID) {
    return false;
  }
  // if parent is a reference node, parent must be a renamed node. We can 
  // stop the check at the reference node.
  if (parent != null && parent.isReference()) {
    return true;
  }
  final INodeDirectory parentDir = getParent();
  if (parentDir == null) { // root
    return true;
  }
  if (!parentDir.isInLatestSnapshot(latestSnapshotId)) {
    return false;
  }
  final INode child = parentDir.getChild(getLocalNameBytes(), latestSnapshotId);
  if (this == child) {
    return true;
  }
  return child != null && child.isReference() &&
      this == child.asReference().getReferredINode();
}
 

/**
 * When {@link #recordModification} is called on a referred node,
 * this method tells which snapshot the modification should be
 * associated with: the snapshot that belongs to the SRC tree of the rename
 * operation, or the snapshot belonging to the DST tree.
 * 
 * @param latestInDst
 *          id of the latest snapshot in the DST tree above the reference node
 * @return True: the modification should be recorded in the snapshot that
 *         belongs to the SRC tree. False: the modification should be
 *         recorded in the snapshot that belongs to the DST tree.
 */
public final boolean shouldRecordInSrcSnapshot(final int latestInDst) {
  Preconditions.checkState(!isReference());

  if (latestInDst == Snapshot.CURRENT_STATE_ID) {
    return true;
  }
  INodeReference withCount = getParentReference();
  if (withCount != null) {
    int dstSnapshotId = withCount.getParentReference().getDstSnapshotId();
    if (dstSnapshotId != Snapshot.CURRENT_STATE_ID
        && dstSnapshotId >= latestInDst) {
      return true;
    }
  }
  return false;
}
 

@Override
public void cleanSubtree(ReclaimContext reclaimContext, int snapshot,
    int prior) {
  if (snapshot == Snapshot.CURRENT_STATE_ID
      && prior == Snapshot.NO_SNAPSHOT_ID) {
    destroyAndCollectBlocks(reclaimContext);
  } else {
    // if prior is NO_SNAPSHOT_ID, we need to check snapshot belonging to 
    // the previous WithName instance
    if (prior == Snapshot.NO_SNAPSHOT_ID) {
      prior = getPriorSnapshot(this);
    }
    // if prior is not NO_SNAPSHOT_ID, and prior is not before the
    // to-be-deleted snapshot, we can quit here and leave the snapshot
    // deletion work to the src tree of rename
    if (snapshot != Snapshot.CURRENT_STATE_ID
        && prior != Snapshot.NO_SNAPSHOT_ID
        && Snapshot.ID_INTEGER_COMPARATOR.compare(snapshot, prior) <= 0) {
      return;
    }
    getReferredINode().cleanSubtree(reclaimContext, snapshot, prior);
  }
}
 

/** Call cleanSubtree(..) recursively down the subtree. */
public void cleanSubtreeRecursively(
    ReclaimContext reclaimContext, final int snapshot, int prior,
    final Map<INode, INode> excludedNodes) {
  // in case of deletion snapshot, since this call happens after we modify
  // the diff list, the snapshot to be deleted has been combined or renamed
  // to its latest previous snapshot. (besides, we also need to consider nodes
  // created after prior but before snapshot. this will be done in 
  // DirectoryWithSnapshotFeature)
  int s = snapshot != Snapshot.CURRENT_STATE_ID
      && prior != Snapshot.NO_SNAPSHOT_ID ? prior : snapshot;
  for (INode child : getChildrenList(s)) {
    if (snapshot == Snapshot.CURRENT_STATE_ID || excludedNodes == null ||
        !excludedNodes.containsKey(child)) {
      child.cleanSubtree(reclaimContext, snapshot, prior);
    }
  }
}
 

@Override
public ContentSummaryComputationContext computeContentSummary(int snapshotId,
    ContentSummaryComputationContext summary) {
  final DirectoryWithSnapshotFeature sf = getDirectoryWithSnapshotFeature();
  if (sf != null && snapshotId == Snapshot.CURRENT_STATE_ID) {
    // if the getContentSummary call is against a non-snapshot path, the
    // computation should include all the deleted files/directories
    sf.computeContentSummary4Snapshot(summary.getBlockStoragePolicySuite(),
        summary.getCounts());
  }
  final DirectoryWithQuotaFeature q = getDirectoryWithQuotaFeature();
  if (q != null && snapshotId == Snapshot.CURRENT_STATE_ID) {
    return q.computeContentSummary(this, summary);
  } else {
    return computeDirectoryContentSummary(summary, snapshotId);
  }
}
 

@Override
public QuotaCounts cleanSubtree(BlockStoragePolicySuite bsps, int snapshot, int prior,
    BlocksMapUpdateInfo collectedBlocks, List<INode> removedINodes) {
  if (snapshot == Snapshot.CURRENT_STATE_ID
      && prior == Snapshot.NO_SNAPSHOT_ID) {
    QuotaCounts counts = new QuotaCounts.Builder().build();
    this.computeQuotaUsage(bsps, counts, true);
    destroyAndCollectBlocks(bsps, collectedBlocks, removedINodes);
    return counts;
  } else {
    // if prior is NO_SNAPSHOT_ID, we need to check snapshot belonging to 
    // the previous WithName instance
    if (prior == Snapshot.NO_SNAPSHOT_ID) {
      prior = getPriorSnapshot(this);
    }
    // if prior is not NO_SNAPSHOT_ID, and prior is not before the
    // to-be-deleted snapshot, we can quit here and leave the snapshot
    // deletion work to the src tree of rename
    if (snapshot != Snapshot.CURRENT_STATE_ID
        && prior != Snapshot.NO_SNAPSHOT_ID
        && Snapshot.ID_INTEGER_COMPARATOR.compare(snapshot, prior) <= 0) {
      return new QuotaCounts.Builder().build();
    }
    return getReferredINode().cleanSubtree(bsps, snapshot, prior,
        collectedBlocks, removedINodes);
  }
}
 

@Override
final String getUserName(int snapshotId) {
  if (snapshotId != Snapshot.CURRENT_STATE_ID) {
    return getSnapshotINode(snapshotId).getUserName();
  }
  return PermissionStatusFormat.getUser(permission);
}
 

@Override
final FsPermission getFsPermission(int snapshotId) {
  if (snapshotId != Snapshot.CURRENT_STATE_ID) {
    return getSnapshotINode(snapshotId).getFsPermission();
  }

  return new FsPermission(getFsPermissionShort());
}
 

@Override
public QuotaCounts computeQuotaUsage(BlockStoragePolicySuite bsps,
    byte blockStoragePolicyId, QuotaCounts counts, boolean useCache,
    int lastSnapshotId) {
  final DirectoryWithSnapshotFeature sf = getDirectoryWithSnapshotFeature();

  // we are computing the quota usage for a specific snapshot here, i.e., the
  // computation only includes files/directories that exist at the time of the
  // given snapshot
  if (sf != null && lastSnapshotId != Snapshot.CURRENT_STATE_ID
      && !(useCache && isQuotaSet())) {
    ReadOnlyList<INode> childrenList = getChildrenList(lastSnapshotId);
    for (INode child : childrenList) {
      final byte childPolicyId = child.getStoragePolicyIDForQuota(blockStoragePolicyId);
      child.computeQuotaUsage(bsps, childPolicyId, counts, useCache,
          lastSnapshotId);
    }
    counts.addNameSpace(1);
    return counts;
  }
  
  // compute the quota usage in the scope of the current directory tree
  final DirectoryWithQuotaFeature q = getDirectoryWithQuotaFeature();
  if (useCache && q != null && q.isQuotaSet()) { // use the cached quota
    return q.AddCurrentSpaceUsage(counts);
  } else {
    useCache = q != null && !q.isQuotaSet() ? false : useCache;
    return computeDirectoryQuotaUsage(bsps, blockStoragePolicyId, counts,
        useCache, lastSnapshotId);
  }
}
 

@Override
final long getModificationTime(int snapshotId) {
  if (snapshotId != Snapshot.CURRENT_STATE_ID) {
    return getSnapshotINode(snapshotId).getModificationTime();
  }

  return this.modificationTime;
}
 

@Override
final long getAccessTime(int snapshotId) {
  if (snapshotId != Snapshot.CURRENT_STATE_ID) {
    return getSnapshotINode(snapshotId).getAccessTime();
  }
  return accessTime;
}