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   * 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 java.io.Serializable;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.Map;
  import org.apache.beam.sdk.nexmark.NexmarkConfiguration;
  import org.apache.beam.sdk.nexmark.NexmarkUtils;
  import org.apache.beam.sdk.nexmark.model.Auction;
  import org.apache.beam.sdk.nexmark.model.Event;
  import org.apache.beam.sdk.nexmark.model.IdNameReserve;
  import org.apache.beam.sdk.nexmark.model.Person;
  import org.apache.beam.sdk.values.TimestampedValue;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ArrayListMultimap;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Multimap;
  import org.joda.time.Duration;
  import org.joda.time.Instant;
  
  /** A direct implementation of {@link Query8}. */
  @SuppressWarnings({
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  public class Query8Model extends NexmarkQueryModel<IdNameReserve> implements Serializable {
    /** Simulator for query 8. */
    private class Simulator extends AbstractSimulator<Event, IdNameReserve> {
      /** New persons seen in the current window, indexed by id. */
      private final Map<Long, Person> newPersons;
  
      /** New auctions seen in the current window, indexed by seller id. */
      private final Multimap<Long, Auction> newAuctions;
  
      /** When did the current window start. */
      private Instant windowStart;
  
      public Simulator(NexmarkConfiguration configuration) {
        super(NexmarkUtils.standardEventIterator(configuration));
        newPersons = new HashMap<>();
        newAuctions = ArrayListMultimap.create();
        windowStart = NexmarkUtils.BEGINNING_OF_TIME;
      }
  
      /** Retire all persons added in last window. */
      private void retirePersons() {
        for (Map.Entry<Long, Person> entry : newPersons.entrySet()) {
          NexmarkUtils.info("retire: %s", entry.getValue());
        }
        newPersons.clear();
      }
  
      /** Retire all auctions added in last window. */
      private void retireAuctions() {
        for (Map.Entry<Long, Auction> entry : newAuctions.entries()) {
          NexmarkUtils.info("retire: %s", entry.getValue());
        }
        newAuctions.clear();
      }
  
      /** Capture new result. */
      private void addResult(Auction auction, Person person, Instant timestamp) {
        addResult(
            TimestampedValue.of(
                new IdNameReserve(person.id, person.name, auction.reserve), timestamp));
      }
  
      @Override
      public void run() {
        TimestampedValue<Event> timestampedEvent = nextInput();
        if (timestampedEvent == null) {
          allDone();
          return;
        }
  
        Event event = timestampedEvent.getValue();
        if (event.bid != null) {
          // Ignore bid events.
          // Keep looking for next events.
          return;
        }
        Instant timestamp = timestampedEvent.getTimestamp();
        Instant newWindowStart =
            windowStart(
                Duration.standardSeconds(configuration.windowSizeSec),
                Duration.standardSeconds(configuration.windowSizeSec),
                timestamp);
        if (!newWindowStart.equals(windowStart)) {
          // Retire this window.
          retirePersons();
          retireAuctions();
          windowStart = newWindowStart;
        }
  
        if (event.newAuction != null) {
          // Join new auction with existing person, if any.
          Person person = newPersons.get(event.newAuction.seller);
          if (person != null) {
            addResult(event.newAuction, person, timestamp);
          } else {
            // Remember auction for future new people.
            newAuctions.put(event.newAuction.seller, event.newAuction);
          }
        } else { // event is not an auction, nor a bid, so it is a person
          // Join new person with existing auctions.
          for (Auction auction : newAuctions.get(event.newPerson.id)) {
            addResult(auction, event.newPerson, timestamp);
          }
          // We'll never need these auctions again.
          newAuctions.removeAll(event.newPerson.id);
          // Remember person for future auctions.
          newPersons.put(event.newPerson.id, event.newPerson);
        }
      }
    }
  
    public Query8Model(NexmarkConfiguration configuration) {
      super(configuration);
    }
  
    @Override
    public AbstractSimulator<?, IdNameReserve> simulator() {
      return new Simulator(configuration);
    }
  
    @Override
    protected Collection<String> toCollection(Iterator<TimestampedValue<IdNameReserve>> itr) {
      return toValue(itr);
    }
  }
  