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A table format for huge analytic datasets

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/*
 * 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.iceberg.spark;

import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import org.apache.iceberg.FileScanTask;
import org.apache.iceberg.HasTableOperations;
import org.apache.iceberg.Table;
import org.apache.iceberg.TableOperations;
import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
import org.apache.iceberg.relocated.com.google.common.collect.Maps;
import org.apache.iceberg.util.Pair;

public class FileScanTaskSetManager {

  private static final FileScanTaskSetManager INSTANCE = new FileScanTaskSetManager();

  private final Map, List> tasksMap = Maps.newConcurrentMap();

  private FileScanTaskSetManager() {
  }

  public static FileScanTaskSetManager get() {
    return INSTANCE;
  }

  public void stageTasks(Table table, String setID, List tasks) {
    Preconditions.checkArgument(tasks != null && tasks.size() > 0, "Cannot stage null or empty tasks");
    Pair id = toID(table, setID);
    tasksMap.put(id, tasks);
  }

  public List fetchTasks(Table table, String setID) {
    Pair id = toID(table, setID);
    return tasksMap.get(id);
  }

  public List removeTasks(Table table, String setID) {
    Pair id = toID(table, setID);
    return tasksMap.remove(id);
  }

  public Set fetchSetIDs(Table table) {
    return tasksMap.keySet().stream()
        .filter(e -> e.first().equals(tableUUID(table)))
        .map(Pair::second)
        .collect(Collectors.toSet());
  }

  private String tableUUID(Table table) {
    TableOperations ops = ((HasTableOperations) table).operations();
    return ops.current().uuid();
  }

  private Pair toID(Table table, String setID) {
    return Pair.of(tableUUID(table), setID);
  }
}