content: /*
   * 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.asterix.transaction.management.service.transaction;
  
  import org.apache.asterix.common.exceptions.AsterixException;
  import org.apache.asterix.common.exceptions.ErrorCode;
  import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
  
  public class DatasetIdFactory {
      private static int id = 0;
      private static boolean isInitialized = false;
  
      public static synchronized boolean isInitialized() {
          return isInitialized;
      }
  
      public static synchronized void initialize(int initialId) {
          id = initialId;
          isInitialized = true;
      }
  
      public static synchronized int generateDatasetId() throws AlgebricksException {
          if (id == Integer.MAX_VALUE) {
              throw new AsterixException(ErrorCode.DATASET_ID_EXHAUSTED);
          }
          return ++id;
      }
  
      public static int generateAlternatingDatasetId(int originalId) {
          return originalId ^ 0x80000000;
      }
  
      public static synchronized int getMostRecentDatasetId() {
          return id;
      }
  }
  