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.beam.sdk.nexmark.queries;
  
  import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkState;
  
  import java.util.Map;
  import org.apache.beam.sdk.nexmark.NexmarkConfiguration;
  import org.apache.beam.sdk.nexmark.model.Bid;
  import org.apache.beam.sdk.nexmark.model.Event;
  import org.apache.beam.sdk.transforms.DoFn;
  import org.apache.beam.sdk.transforms.ParDo;
  import org.apache.beam.sdk.transforms.View;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.PCollectionView;
  
  /**
   * Query that joins a stream to a bounded side input, modeling basic stream enrichment.
   *
   * <pre>
   * SELECT bid.*, sideInput.*
   * FROM bid, sideInput
   * WHERE bid.id = sideInput.id
   * </pre>
   */
  @SuppressWarnings({
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  public class BoundedSideInputJoin extends NexmarkQueryTransform<Bid> {
    private final NexmarkConfiguration configuration;
  
    public BoundedSideInputJoin(NexmarkConfiguration configuration) {
      super("BoundedSideInputJoin");
      this.configuration = configuration;
    }
  
    @Override
    public boolean needsSideInput() {
      return true;
    }
  
    @Override
    public PCollection<Bid> expand(PCollection<Event> events) {
  
      checkState(getSideInput() != null, "Configuration error: side input is null");
  
      final PCollectionView<Map<Long, String>> sideInputMap = getSideInput().apply(View.asMap());
  
      return events
          // Only want the bid events; easier to fake some side input data
          .apply(NexmarkQueryUtil.JUST_BIDS)
  
          // Map the conversion function over all bids.
          .apply(
              name + ".JoinToFiles",
              ParDo.of(
                      new DoFn<Bid, Bid>() {
                        @ProcessElement
                        public void processElement(ProcessContext c) {
                          Bid bid = c.element();
                          c.output(
                              new Bid(
                                  bid.auction,
                                  bid.bidder,
                                  bid.price,
                                  bid.dateTime,
                                  c.sideInput(sideInputMap)
                                      .get(bid.bidder % configuration.sideInputRowCount)));
                        }
                      })
                  .withSideInputs(sideInputMap));
    }
  }
  