content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.master.file.mdsync;
  
  import alluxio.AlluxioURI;
  import alluxio.conf.path.TrieNode;
  import alluxio.resource.CloseableResource;
  import alluxio.underfs.UfsClient;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.function.Function;
  
  class DirectoryPathWaiter extends BaseTask {
    private static final Logger LOG = LoggerFactory.getLogger(DirectoryPathWaiter.class);
  
    private final TrieNode<AlluxioURI> mCompletedDirs = new TrieNode<>();
  
    DirectoryPathWaiter(
        TaskInfo info, long startTime, Function<AlluxioURI,
        CloseableResource<UfsClient>> clientSupplier,
        boolean removeOnComplete) {
      super(info, startTime, clientSupplier, removeOnComplete);
    }
  
    @Override
    public synchronized boolean waitForSync(AlluxioURI path) {
      while (true) {
        if (mIsCompleted != null) {
          return !mIsCompleted.getThrowable().isPresent();
        }
        boolean completed = mCompletedDirs.getClosestTerminal(path.getPath())
            .map(result -> {
              if (result.getValue().equals(path)) {
                return true;
              }
              AlluxioURI parent = path.getParent();
              return parent != null && parent.equals(result.getValue());
            }).orElse(false);
        if (completed) {
          return true;
        }
        try {
          wait();
        } catch (InterruptedException e) {
          LOG.debug("Interrupted while waiting for synced path {}", path);
          return false;
        }
      }
    }
  
    @Override
    public synchronized void nextCompleted(SyncProcessResult completed) {
      if (!completed.isTruncated()) {
        LOG.debug("Completed load of path {}", completed.getBaseLoadPath());
        mCompletedDirs.insert(completed.getBaseLoadPath().getPath())
            .setValue(completed.getBaseLoadPath());
        notifyAll();
      }
    }
  }
  