| /* |
| * 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.v20_0.com.google.common.collect.ArrayListMultimap; |
| import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.Multimap; |
| import org.joda.time.Duration; |
| import org.joda.time.Instant; |
| |
| /** A direct implementation of {@link Query8}. */ |
| 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); |
| } |
| } |