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.reader;
  
  import org.apache.flink.annotation.Internal;
  import org.apache.flink.api.connector.source.SourceReaderContext;
  import org.apache.flink.configuration.Configuration;
  import org.apache.flink.connector.base.source.reader.RecordEmitter;
  import org.apache.flink.connector.base.source.reader.SingleThreadMultiplexSourceReaderBase;
  import org.apache.flink.streaming.connectors.influxdb.common.DataPoint;
  import org.apache.flink.streaming.connectors.influxdb.source.split.InfluxDBSplit;
  
  import java.util.Map;
  import java.util.function.Supplier;
  
  /** The source reader for the InfluxDB line protocol. */
  @Internal
  public final class InfluxDBSourceReader<OUT>
          extends SingleThreadMultiplexSourceReaderBase<
                  DataPoint, OUT, InfluxDBSplit, InfluxDBSplit> {
  
      public InfluxDBSourceReader(
              final Supplier<InfluxDBSplitReader> splitReaderSupplier,
              final RecordEmitter<DataPoint, OUT, InfluxDBSplit> recordEmitter,
              final Configuration config,
              final SourceReaderContext context) {
          super(splitReaderSupplier::get, recordEmitter, config, context);
      }
  
      @Override
      public void start() {
          // we request a split only if we did not get splits during the checkpoint restore
          if (this.getNumberOfCurrentlyAssignedSplits() == 0) {
              this.context.sendSplitRequest();
          }
      }
  
      @Override
      protected void onSplitFinished(final Map<String, InfluxDBSplit> map) {
          this.context.sendSplitRequest();
      }
  
      @Override
      protected InfluxDBSplit initializedState(final InfluxDBSplit influxDBSplit) {
          return influxDBSplit;
      }
  
      @Override
      protected InfluxDBSplit toSplitType(final String s, final InfluxDBSplit influxDBSplitState) {
          return influxDBSplitState;
      }
  }
  