content: /*
   * Copyright 2020 Alibaba Group Holding Limited.
   *
   * Licensed 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 com.alibaba.graphscope.common.ir.meta.reader;
  
  import com.alibaba.graphscope.common.ir.meta.GraphId;
  import com.alibaba.graphscope.common.ir.meta.IrMeta;
  import com.alibaba.graphscope.groot.common.schema.api.GraphStatistics;
  
  import java.io.IOException;
  
  /**
   * {@code IrMetaReader} is used to read Ir Meta from a data source (can be a local file or remote web service).
   */
  public interface IrMetaReader {
      IrMeta readMeta() throws IOException;
  
      // get statistics from a graph referenced by graphId
      GraphStatistics readStats(GraphId graphId) throws IOException;
  
      // a synchronous invocation to check whether statistics functionality is enabled in the backend
      boolean syncStatsEnabled(GraphId graphId) throws IOException;
  }
  