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BatchCoGroup.java
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BatchCoGroup.java
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/*
* Copyright (c) 2008-2019, Hazelcast, Inc. All Rights Reserved.
*
* Licensed 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.
*/
import com.hazelcast.core.IList;
import com.hazelcast.core.IMap;
import com.hazelcast.jet.Jet;
import com.hazelcast.jet.JetInstance;
import com.hazelcast.jet.datamodel.ItemsByTag;
import com.hazelcast.jet.datamodel.Tag;
import com.hazelcast.jet.datamodel.Tuple3;
import com.hazelcast.jet.pipeline.BatchStage;
import com.hazelcast.jet.pipeline.BatchStageWithKey;
import com.hazelcast.jet.pipeline.GroupAggregateBuilder;
import com.hazelcast.jet.pipeline.Pipeline;
import com.hazelcast.jet.pipeline.Sinks;
import com.hazelcast.jet.pipeline.Sources;
import datamodel.AddToCart;
import datamodel.PageVisit;
import datamodel.Payment;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import static com.hazelcast.jet.Util.entry;
import static com.hazelcast.jet.aggregate.AggregateOperations.toList;
import static com.hazelcast.jet.datamodel.Tuple3.tuple3;
/**
* Demonstrates the usage of Pipeline API's co-group transformation, which
* joins two or more streams on a common key and performs a user-specified
* aggregate operation on the co-grouped items.
*/
@SuppressWarnings("Convert2MethodRef") // https://bugs.openjdk.java.net/browse/JDK-8154236
public final class BatchCoGroup {
private static final String PAGE_VISIT = "pageVisit";
private static final String ADD_TO_CART = "addToCart";
private static final String PAYMENT = "payment";
private static final String RESULT = "result";
private final JetInstance jet;
private final Map<Integer, Set<PageVisit>> userId2PageVisit = new HashMap<>();
private final Map<Integer, Set<AddToCart>> userId2AddToCart = new HashMap<>();
private final Map<Integer, Set<Payment>> userId2Payment = new HashMap<>();
private BatchCoGroup(JetInstance jet) {
this.jet = jet;
}
private static Pipeline coGroupDirect() {
Pipeline p = Pipeline.create();
// Create three source streams
BatchStageWithKey<PageVisit, Integer> pageVisits =
p.drawFrom(Sources.<PageVisit>list(PAGE_VISIT))
.groupingKey(pageVisit -> pageVisit.userId());
BatchStageWithKey<AddToCart, Integer> addToCarts =
p.drawFrom(Sources.<AddToCart>list(ADD_TO_CART))
.groupingKey(addToCart -> addToCart.userId());
BatchStageWithKey<Payment, Integer> payments =
p.drawFrom(Sources.<Payment>list(PAYMENT))
.groupingKey(payment -> payment.userId());
// Construct the co-group transform. The aggregate operation collects all
// the stream items into a 3-tuple of lists.
BatchStage<Entry<Integer, Tuple3<List<PageVisit>, List<AddToCart>, List<Payment>>>> coGrouped =
pageVisits.aggregate3(toList(), addToCarts, toList(), payments, toList());
// Store the results in the output map
coGrouped.drainTo(Sinks.map(RESULT));
return p;
}
private static Pipeline coGroupBuild() {
Pipeline p = Pipeline.create();
// Create three source streams
BatchStageWithKey<PageVisit, Integer> pageVisits =
p.drawFrom(Sources.<PageVisit>list(PAGE_VISIT))
.groupingKey(pageVisit -> pageVisit.userId());
BatchStageWithKey<AddToCart, Integer> addToCarts =
p.drawFrom(Sources.<AddToCart>list(ADD_TO_CART))
.groupingKey(addToCart -> addToCart.userId());
BatchStageWithKey<Payment, Integer> payments =
p.drawFrom(Sources.<Payment>list(PAYMENT))
.groupingKey(payment -> payment.userId());
// Obtain a builder object for the co-group transform
GroupAggregateBuilder<Integer, List<PageVisit>> builder = pageVisits.aggregateBuilder(toList());
Tag<List<PageVisit>> visitTag = builder.tag0();
// Add the co-grouped streams to the builder. Here we add just two, but
// you could add any number of them.
Tag<List<AddToCart>> cartTag = builder.add(addToCarts, toList());
Tag<List<Payment>> payTag = builder.add(payments, toList());
// Build the co-group transform. The aggregate operation collects all the
// stream items into ItemsByTag. We transform it into a 3-tuple of lists.
BatchStage<Entry<Integer, Tuple3<List<PageVisit>, List<AddToCart>, List<Payment>>>> coGrouped = builder
.build()
.map(keyAndVals -> {
ItemsByTag ibt = keyAndVals.getValue();
return entry(keyAndVals.getKey(), tuple3(ibt.get(visitTag), ibt.get(cartTag), ibt.get(payTag)));
});
// Store the results in the output map
coGrouped.drainTo(Sinks.map(RESULT));
return p;
}
public static void main(String[] args) {
System.setProperty("hazelcast.logging.type", "log4j");
JetInstance jet = Jet.newJetInstance();
Jet.newJetInstance();
new BatchCoGroup(jet).go();
}
private void go() {
prepareSampleData();
try {
jet.newJob(coGroupDirect()).join();
validateCoGroupResults();
jet.getMap(RESULT).clear();
jet.newJob(coGroupBuild()).join();
validateCoGroupResults();
} finally {
Jet.shutdownAll();
}
}
private void validateCoGroupResults() {
IMap<Integer, Tuple3<List<PageVisit>, List<AddToCart>, List<Payment>>> result = jet.getMap(RESULT);
printImap(result);
for (int userId = 11; userId < 13; userId++) {
Tuple3<List<PageVisit>, List<AddToCart>, List<Payment>> r = result.get(userId);
assertEqual(userId2PageVisit.get(userId), r.f0());
assertEqual(userId2AddToCart.get(userId), r.f1());
assertEqual(userId2Payment.get(userId), r.f2());
}
System.out.println("BatchCoGroup results are valid");
}
private void prepareSampleData() {
IList<AddToCart> addToCartList = jet.getList(ADD_TO_CART);
IList<Payment> paymentList = jet.getList(PAYMENT);
IList<PageVisit> pageVisitList = jet.getList(PAGE_VISIT);
int quantity = 21;
int amount = 31;
int loadTime = 1;
long timestamp = System.currentTimeMillis();
for (int userId = 11; userId < 13; userId++) {
userId2AddToCart.put(userId, new HashSet<>());
userId2Payment.put(userId, new HashSet<>());
userId2PageVisit.put(userId, new HashSet<>());
for (int i = 0; i < 2; i++) {
PageVisit visit = new PageVisit(timestamp, userId, loadTime);
AddToCart atc = new AddToCart(timestamp, userId, quantity);
Payment pay = new Payment(timestamp, userId, amount);
addToCartList.add(atc);
paymentList.add(pay);
pageVisitList.add(visit);
userId2AddToCart.get(userId).add(atc);
userId2Payment.get(userId).add(pay);
userId2PageVisit.get(userId).add(visit);
loadTime++;
quantity++;
amount++;
timestamp += 1000;
}
}
printIList(addToCartList);
printIList(paymentList);
printIList(pageVisitList);
}
private static <T> void assertEqual(Set<T> expected, Collection<T> actual) {
if (actual.size() != expected.size() || !expected.containsAll(actual)) {
throw new AssertionError("Mismatch: expected " + expected + "; actual " + actual);
}
}
private static <K, V> void printImap(IMap<K, V> imap) {
StringBuilder sb = new StringBuilder();
System.out.println(imap.getName() + ':');
imap.forEach((k, v) -> sb.append(k).append("->").append(v).append('\n'));
System.out.println(sb);
}
private static void printIList(IList<?> list) {
StringBuilder sb = new StringBuilder();
System.out.println(list.getName() + ':');
list.forEach(e -> sb.append(e).append('\n'));
System.out.println(sb);
}
}