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.master.file.DefaultFileSystemMaster;
  import alluxio.master.file.meta.InodeTree;
  import alluxio.underfs.UfsLoadResult;
  
  import com.google.common.annotations.VisibleForTesting;
  
  import java.util.Optional;
  
  /**
   * The interactions between different task processing steps is exposed through this
   * standard interface in order to allow changes in the future, for example calling
   * separate components over the network.
   */
  public class MetadataSyncHandler {
  
    private final TaskTracker mTaskTracker;
    @VisibleForTesting
    final DefaultFileSystemMaster mFsMaster;
    private final InodeTree mInodeTree;
  
    /**
     * Creates a metadata sync kernel.
     * @param taskTracker the task tracker
     * @param fsMaster the file system master
     * @param inodeTree the inode tree
     */
    public MetadataSyncHandler(
        TaskTracker taskTracker, DefaultFileSystemMaster fsMaster, InodeTree inodeTree) {
      mTaskTracker = taskTracker;
      mFsMaster = fsMaster;
      mInodeTree = inodeTree;
    }
  
    void onLoadRequestError(long taskId, long loadId, Throwable t) {
      mTaskTracker.getActiveTask(taskId).ifPresent(
          task -> task.getPathLoadTask().onLoadRequestError(loadId, t));
    }
  
    void onFailed(long taskId, Throwable t) {
      mTaskTracker.getActiveTask(taskId).ifPresent(task -> {
        task.onFailed(t);
      });
    }
  
    void onProcessError(long taskId, Throwable t) {
      mTaskTracker.getActiveTask(taskId).ifPresent(task ->
          task.getPathLoadTask().onProcessError(t));
    }
  
    void onEachResult(long taskId, SyncProcessResult result) {
      mTaskTracker.getActiveTask(taskId).ifPresent(task -> task.nextCompleted(result));
    }
  
    void onTaskError(long taskId, Throwable t) {
      mTaskTracker.getActiveTask(taskId).ifPresent(task -> mTaskTracker.taskError(taskId, t));
    }
  
    void onTaskComplete(long taskId, boolean isFile) {
      mTaskTracker.taskComplete(taskId, isFile);
    }
  
    void onPathLoadComplete(long taskId, boolean isFile) {
      mTaskTracker.getActiveTask(taskId).ifPresent(
          task -> task.onComplete(isFile, mFsMaster, mInodeTree));
    }
  
    /**
     * Loads a nested directory.
     * @param taskId the task id
     * @param path the load path
     */
    public void loadNestedDirectory(long taskId, AlluxioURI path) {
      mTaskTracker.getActiveTask(taskId).ifPresent(
          task -> task.getPathLoadTask().loadNestedDirectory(path));
    }
  
    Optional<LoadResult> onReceiveLoadRequestOutput(long taskId, long loadId, UfsLoadResult result) {
      return mTaskTracker.getActiveTask(taskId).flatMap(task ->
          task.getPathLoadTask().createLoadResult(loadId, result));
    }
  
    void onProcessComplete(long taskId, long loadRequestId, SyncProcessResult result) {
      mTaskTracker.getActiveTask(taskId).ifPresent(task ->
          task.getPathLoadTask().onProcessComplete(loadRequestId, result));
    }
  }
  