exec/java-exec/src/main/java/org/apache/drill/exec/store/dfs/OpenFileTracker.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.drill.exec.store.dfs;

import org.apache.hadoop.fs.Path;

/**
 * Interface to track opening and closing of files.
 */
public interface OpenFileTracker {
  /**
   * Add new file location and {@link org.apache.drill.exec.store.dfs.DrillFSDataInputStream} to list.
   */
  public void fileOpened(Path path, DrillFSDataInputStream fsDataInputStream);

  /**
   * Remove the given {@link org.apache.drill.exec.store.dfs.DrillFSDataInputStream} from opened file list.
   * @param fsDataInputStream
   */
  public void fileClosed(DrillFSDataInputStream fsDataInputStream);
}