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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.
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package org.apache.kafka.streams.kstream.internals;
import org.apache.kafka.common.serialization.Serde;
import org.apache.kafka.common.serialization.Serdes;
import org.apache.kafka.streams.KeyValue;
import org.apache.kafka.streams.kstream.KStreamBuilder;
import org.apache.kafka.streams.kstream.KTable;
import org.apache.kafka.test.KStreamTestDriver;
import org.apache.kafka.test.MockProcessorSupplier;
import org.apache.kafka.test.MockValueJoiner;
import org.apache.kafka.test.TestUtils;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
public class KTableKTableJoinTest {
final private String topic1 = "topic1";
final private String topic2 = "topic2";
final private String storeName1 = "store-name-1";
final private String storeName2 = "store-name-2";
final private Serde<Integer> intSerde = Serdes.Integer();
final private Serde<String> stringSerde = Serdes.String();
private KStreamTestDriver driver = null;
private File stateDir = null;
@After
public void tearDown() {
if (driver != null) {
driver.close();
}
driver = null;
}
@Before
public void setUp() throws IOException {
stateDir = TestUtils.tempDirectory("kafka-test");
}
private void doTestJoin(final KStreamBuilder builder,
final int[] expectedKeys,
final MockProcessorSupplier<Integer, String> processor,
final KTable<Integer, String> joined) {
final Collection<Set<String>> copartitionGroups = builder.copartitionGroups();
assertEquals(1, copartitionGroups.size());
assertEquals(new HashSet<>(Arrays.asList(topic1, topic2)), copartitionGroups.iterator().next());
final KTableValueGetterSupplier<Integer, String> getterSupplier = ((KTableImpl<Integer, String, String>) joined).valueGetterSupplier();
driver = new KStreamTestDriver(builder, stateDir, Serdes.Integer(), Serdes.String());
driver.setTime(0L);
final KTableValueGetter<Integer, String> getter = getterSupplier.get();
getter.init(driver.context());
// push two items to the primary stream. the other table is empty
for (int i = 0; i < 2; i++) {
driver.process(topic1, expectedKeys[i], "X" + expectedKeys[i]);
}
// pass tuple with null key, it will be discarded in join process
driver.process(topic1, null, "SomeVal");
driver.flushState();
processor.checkAndClearProcessResult();
// push two items to the other stream. this should produce two items.
for (int i = 0; i < 2; i++) {
driver.process(topic2, expectedKeys[i], "Y" + expectedKeys[i]);
}
// pass tuple with null key, it will be discarded in join process
driver.process(topic2, null, "AnotherVal");
driver.flushState();
processor.checkAndClearProcessResult("0:X0+Y0", "1:X1+Y1");
checkJoinedValues(getter, kv(0, "X0+Y0"), kv(1, "X1+Y1"));
// push all four items to the primary stream. this should produce two items.
for (int expectedKey : expectedKeys) {
driver.process(topic1, expectedKey, "XX" + expectedKey);
}
driver.flushState();
processor.checkAndClearProcessResult("0:XX0+Y0", "1:XX1+Y1");
checkJoinedValues(getter, kv(0, "XX0+Y0"), kv(1, "XX1+Y1"));
// push all items to the other stream. this should produce four items.
for (int expectedKey : expectedKeys) {
driver.process(topic2, expectedKey, "YY" + expectedKey);
}
driver.flushState();
processor.checkAndClearProcessResult("0:XX0+YY0", "1:XX1+YY1", "2:XX2+YY2", "3:XX3+YY3");
checkJoinedValues(getter, kv(0, "XX0+YY0"), kv(1, "XX1+YY1"), kv(2, "XX2+YY2"), kv(3, "XX3+YY3"));
// push all four items to the primary stream. this should produce four items.
for (int expectedKey : expectedKeys) {
driver.process(topic1, expectedKey, "X" + expectedKey);
}
driver.flushState();
processor.checkAndClearProcessResult("0:X0+YY0", "1:X1+YY1", "2:X2+YY2", "3:X3+YY3");
checkJoinedValues(getter, kv(0, "X0+YY0"), kv(1, "X1+YY1"), kv(2, "X2+YY2"), kv(3, "X3+YY3"));
// push two items with null to the other stream as deletes. this should produce two item.
for (int i = 0; i < 2; i++) {
driver.process(topic2, expectedKeys[i], null);
}
driver.flushState();
processor.checkAndClearProcessResult("0:null", "1:null");
checkJoinedValues(getter, kv(0, null), kv(1, null));
// push all four items to the primary stream. this should produce two items.
for (int expectedKey : expectedKeys) {
driver.process(topic1, expectedKey, "XX" + expectedKey);
}
driver.flushState();
processor.checkAndClearProcessResult("2:XX2+YY2", "3:XX3+YY3");
checkJoinedValues(getter, kv(2, "XX2+YY2"), kv(3, "XX3+YY3"));
driver.process(topic1, null, "XX" + 1);
checkJoinedValues(getter, kv(2, "XX2+YY2"), kv(3, "XX3+YY3"));
}
@Test
public void testJoin() throws Exception {
final KStreamBuilder builder = new KStreamBuilder();
final int[] expectedKeys = new int[]{0, 1, 2, 3};
final KTable<Integer, String> table1;
final KTable<Integer, String> table2;
final KTable<Integer, String> joined;
final MockProcessorSupplier<Integer, String> processor;
processor = new MockProcessorSupplier<>();
table1 = builder.table(intSerde, stringSerde, topic1, storeName1);
table2 = builder.table(intSerde, stringSerde, topic2, storeName2);
joined = table1.join(table2, MockValueJoiner.TOSTRING_JOINER);
joined.toStream().process(processor);
doTestJoin(builder, expectedKeys, processor, joined);
}
@Test
public void testQueryableJoin() throws Exception {
final KStreamBuilder builder = new KStreamBuilder();
final int[] expectedKeys = new int[]{0, 1, 2, 3};
final KTable<Integer, String> table1;
final KTable<Integer, String> table2;
final KTable<Integer, String> joined;
final MockProcessorSupplier<Integer, String> processor;
processor = new MockProcessorSupplier<>();
table1 = builder.table(intSerde, stringSerde, topic1, storeName1);
table2 = builder.table(intSerde, stringSerde, topic2, storeName2);
joined = table1.join(table2, MockValueJoiner.TOSTRING_JOINER, Serdes.String(), "anyQueryableName");
joined.toStream().process(processor);
doTestJoin(builder, expectedKeys, processor, joined);
}
private void doTestSendingOldValues(final KStreamBuilder builder,
final int[] expectedKeys,
final KTable<Integer, String> table1,
final KTable<Integer, String> table2,
final MockProcessorSupplier<Integer, String> proc,
final KTable<Integer, String> joined,
final boolean sendOldValues) {
driver = new KStreamTestDriver(builder, stateDir, Serdes.Integer(), Serdes.String());
driver.setTime(0L);
if (!sendOldValues) {
assertFalse(((KTableImpl<?, ?, ?>) table1).sendingOldValueEnabled());
assertFalse(((KTableImpl<?, ?, ?>) table2).sendingOldValueEnabled());
assertFalse(((KTableImpl<?, ?, ?>) joined).sendingOldValueEnabled());
} else {
((KTableImpl<?, ?, ?>) joined).enableSendingOldValues();
assertTrue(((KTableImpl<?, ?, ?>) table1).sendingOldValueEnabled());
assertTrue(((KTableImpl<?, ?, ?>) table2).sendingOldValueEnabled());
assertTrue(((KTableImpl<?, ?, ?>) joined).sendingOldValueEnabled());
}
// push two items to the primary stream. the other table is empty
for (int i = 0; i < 2; i++) {
driver.process(topic1, expectedKeys[i], "X" + expectedKeys[i]);
}
driver.flushState();
proc.checkAndClearProcessResult();
// push two items to the other stream. this should produce two items.
for (int i = 0; i < 2; i++) {
driver.process(topic2, expectedKeys[i], "Y" + expectedKeys[i]);
}
driver.flushState();
proc.checkAndClearProcessResult("0:(X0+Y0<-null)", "1:(X1+Y1<-null)");
// push all four items to the primary stream. this should produce two items.
for (int expectedKey : expectedKeys) {
driver.process(topic1, expectedKey, "XX" + expectedKey);
}
driver.flushState();
proc.checkAndClearProcessResult("0:(XX0+Y0<-null)", "1:(XX1+Y1<-null)");
// push all items to the other stream. this should produce four items.
for (int expectedKey : expectedKeys) {
driver.process(topic2, expectedKey, "YY" + expectedKey);
}
driver.flushState();
proc.checkAndClearProcessResult("0:(XX0+YY0<-null)", "1:(XX1+YY1<-null)", "2:(XX2+YY2<-null)", "3:(XX3+YY3<-null)");
// push all four items to the primary stream. this should produce four items.
for (int expectedKey : expectedKeys) {
driver.process(topic1, expectedKey, "X" + expectedKey);
}
driver.flushState();
proc.checkAndClearProcessResult("0:(X0+YY0<-null)", "1:(X1+YY1<-null)", "2:(X2+YY2<-null)", "3:(X3+YY3<-null)");
// push two items with null to the other stream as deletes. this should produce two item.
for (int i = 0; i < 2; i++) {
driver.process(topic2, expectedKeys[i], null);
}
driver.flushState();
proc.checkAndClearProcessResult("0:(null<-null)", "1:(null<-null)");
// push all four items to the primary stream. this should produce two items.
for (int expectedKey : expectedKeys) {
driver.process(topic1, expectedKey, "XX" + expectedKey);
}
driver.flushState();
proc.checkAndClearProcessResult("2:(XX2+YY2<-null)", "3:(XX3+YY3<-null)");
}
@Test
public void testNotSendingOldValues() throws Exception {
final KStreamBuilder builder = new KStreamBuilder();
final int[] expectedKeys = new int[]{0, 1, 2, 3};
final KTable<Integer, String> table1;
final KTable<Integer, String> table2;
final KTable<Integer, String> joined;
final MockProcessorSupplier<Integer, String> proc;
table1 = builder.table(intSerde, stringSerde, topic1, storeName1);
table2 = builder.table(intSerde, stringSerde, topic2, storeName2);
joined = table1.join(table2, MockValueJoiner.TOSTRING_JOINER);
proc = new MockProcessorSupplier<>();
builder.addProcessor("proc", proc, ((KTableImpl<?, ?, ?>) joined).name);
doTestSendingOldValues(builder, expectedKeys, table1, table2, proc, joined, false);
}
@Test
public void testQueryableNotSendingOldValues() throws Exception {
final KStreamBuilder builder = new KStreamBuilder();
final int[] expectedKeys = new int[]{0, 1, 2, 3};
final KTable<Integer, String> table1;
final KTable<Integer, String> table2;
final KTable<Integer, String> joined;
final MockProcessorSupplier<Integer, String> proc;
table1 = builder.table(intSerde, stringSerde, topic1, storeName1);
table2 = builder.table(intSerde, stringSerde, topic2, storeName2);
joined = table1.join(table2, MockValueJoiner.TOSTRING_JOINER, Serdes.String(), "anyQueryableName");
proc = new MockProcessorSupplier<>();
builder.addProcessor("proc", proc, ((KTableImpl<?, ?, ?>) joined).name);
doTestSendingOldValues(builder, expectedKeys, table1, table2, proc, joined, false);
}
@Test
public void testSendingOldValues() throws Exception {
final KStreamBuilder builder = new KStreamBuilder();
final int[] expectedKeys = new int[]{0, 1, 2, 3};
final KTable<Integer, String> table1;
final KTable<Integer, String> table2;
final KTable<Integer, String> joined;
final MockProcessorSupplier<Integer, String> proc;
table1 = builder.table(intSerde, stringSerde, topic1, storeName1);
table2 = builder.table(intSerde, stringSerde, topic2, storeName2);
joined = table1.join(table2, MockValueJoiner.TOSTRING_JOINER);
proc = new MockProcessorSupplier<>();
builder.addProcessor("proc", proc, ((KTableImpl<?, ?, ?>) joined).name);
doTestSendingOldValues(builder, expectedKeys, table1, table2, proc, joined, true);
}
private KeyValue<Integer, String> kv(Integer key, String value) {
return new KeyValue<>(key, value);
}
private void checkJoinedValues(KTableValueGetter<Integer, String> getter, KeyValue<Integer, String>... expected) {
for (KeyValue<Integer, String> kv : expected) {
String value = getter.get(kv.key);
if (kv.value == null) {
assertNull(value);
} else {
assertEquals(kv.value, value);
}
}
}
}