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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * 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.atlas.repository.graphdb;
  
  /**
   * Represents a graph database.
   *
   * @param <V> vertex class used by the graph database
   * @param <E> edge class used by the graph database
   */
  public interface GraphDatabase<V, E> {
      /**
       * Returns whether the graph has been loaded.
       * @return
       */
      boolean isGraphLoaded();
  
      /**
       * Gets the graph, loading it if it has not been loaded already.
       * @return
       */
      AtlasGraph<V, E> getGraph();
  
      /*
       * Get graph initialized for bulk loading. This instance is used for high-performance ingest.
       */
      AtlasGraph<V, E> getGraphBulkLoading();
  
      /**
       * Sets things up so that getGraph() will return a graph that can be used for running
       * tests.
       */
      void initializeTestGraph();
  
      /**
       * Removes the test graph that was created.
       */
      void cleanup();
  }
  