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.flink.streaming.connectors.influxdb.source.enumerator;
  
  import org.apache.flink.annotation.Internal;
  import org.apache.flink.api.connector.source.SplitEnumerator;
  import org.apache.flink.api.connector.source.SplitEnumeratorContext;
  import org.apache.flink.streaming.connectors.influxdb.source.split.InfluxDBSplit;
  import org.jetbrains.annotations.Nullable;
  
  import java.util.List;
  
  import static org.apache.flink.util.Preconditions.checkNotNull;
  
  /** The enumerator class for InfluxDB source. */
  @Internal
  public final class InfluxDBSplitEnumerator
          implements SplitEnumerator<InfluxDBSplit, InfluxDBSourceEnumState> {
  
      private final SplitEnumeratorContext<InfluxDBSplit> context;
  
      public InfluxDBSplitEnumerator(final SplitEnumeratorContext<InfluxDBSplit> context) {
          this.context = checkNotNull(context);
      }
  
      @Override
      public void start() {
          // no resources to start
      }
  
      @Override
      public void handleSplitRequest(final int subtaskId, @Nullable final String requesterHostname) {
          this.context.assignSplit(new InfluxDBSplit(subtaskId), subtaskId);
      }
  
      @Override
      public void addSplitsBack(final List<InfluxDBSplit> splits, final int subtaskId) {}
  
      @Override
      public void addReader(final int subtaskId) {
          // this source is purely lazy-pull-based, nothing to do upon registration
      }
  
      @Override
      public InfluxDBSourceEnumState snapshotState(long l) throws Exception {
          return new InfluxDBSourceEnumState();
      }
  
      @Override
      public void close() {}
  }
  