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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.pulsar.client.impl;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertFalse;
import static org.testng.Assert.assertNull;
import static org.testng.Assert.assertTrue;
import static org.testng.Assert.fail;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import lombok.Cleanup;
import lombok.extern.slf4j.Slf4j;
import org.apache.pulsar.broker.auth.MockedPulsarServiceBaseTest;
import org.apache.pulsar.broker.service.StickyKeyConsumerSelector;
import org.apache.pulsar.client.admin.PulsarAdminException;
import org.apache.pulsar.client.api.Message;
import org.apache.pulsar.client.api.MessageId;
import org.apache.pulsar.client.api.MessageRoutingMode;
import org.apache.pulsar.client.api.Producer;
import org.apache.pulsar.client.api.ProducerBuilder;
import org.apache.pulsar.client.api.PulsarClientException;
import org.apache.pulsar.client.api.Range;
import org.apache.pulsar.client.api.Reader;
import org.apache.pulsar.client.api.Schema;
import org.apache.pulsar.common.naming.TopicName;
import org.apache.pulsar.common.policies.data.ClusterData;
import org.apache.pulsar.common.policies.data.PersistentTopicInternalStats;
import org.apache.pulsar.common.policies.data.Policies;
import org.apache.pulsar.common.policies.data.RetentionPolicies;
import org.apache.pulsar.common.policies.data.TenantInfoImpl;
import org.apache.pulsar.common.util.FutureUtil;
import org.apache.pulsar.common.util.Murmur3_32Hash;
import org.awaitility.Awaitility;
import org.testng.Assert;
import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;
@Slf4j
@Test(groups = "flaky")
public class MultiTopicsReaderTest extends MockedPulsarServiceBaseTest {
private static final String subscription = "reader-multi-topics-sub";
@BeforeClass(alwaysRun = true)
@Override
protected void setup() throws Exception {
super.internalSetup();
admin.clusters().createCluster("test",
ClusterData.builder().serviceUrl(pulsar.getWebServiceAddress()).build());
admin.tenants().createTenant("my-property",
new TenantInfoImpl(Sets.newHashSet("appid1", "appid2"), Sets.newHashSet("test")));
Policies policies = new Policies();
policies.replication_clusters = Sets.newHashSet("test");
// infinite retention
policies.retention_policies = new RetentionPolicies(-1, -1);
admin.namespaces().createNamespace("my-property/my-ns", policies);
}
@AfterClass(alwaysRun = true)
@Override
protected void cleanup() throws Exception {
super.internalCleanup();
}
@Test(timeOut = 30000)
public void testReadMessageWithoutBatching() throws Exception {
String topic = "persistent://my-property/my-ns/my-reader-topic" + UUID.randomUUID();
admin.topics().createPartitionedTopic(topic, 3);
testReadMessages(topic, false);
}
@Test(timeOut = 20000)
public void testReadMessageWithoutBatchingWithMessageInclusive() throws Exception {
String topic = "persistent://my-property/my-ns/my-reader-topic-inclusive" + UUID.randomUUID();
int topicNum = 3;
admin.topics().createPartitionedTopic(topic, topicNum);
Set<String> keys = publishMessages(topic, 10, false);
Reader<byte[]> reader = pulsarClient.newReader().topic(topic).startMessageId(MessageId.latest)
.startMessageIdInclusive().readerName(subscription).create();
int count = 0;
while (reader.hasMessageAvailable()) {
if (keys.remove(reader.readNext(5, TimeUnit.SECONDS).getKey())) {
count++;
}
}
Assert.assertEquals(count, topicNum);
Assert.assertFalse(reader.hasMessageAvailable());
reader.close();
}
@Test(timeOut = 10000)
public void testReadMessageWithBatching() throws Exception {
String topic = "persistent://my-property/my-ns/my-reader-topic-with-batching" + UUID.randomUUID();
admin.topics().createPartitionedTopic(topic, 3);
testReadMessages(topic, true);
}
@Test(timeOut = 10000)
public void testHasMessageAvailableAsync() throws Exception {
String topic = "persistent://my-property/my-ns/testHasMessageAvailableAsync";
String content = "my-message-";
int msgNum = 10;
admin.topics().createPartitionedTopic(topic, 2);
// stop retention from cleaning up
pulsarClient.newConsumer().topic(topic).subscriptionName("sub1").subscribe().close();
try (Reader<byte[]> reader = pulsarClient.newReader().topic(topic).readCompacted(true)
.startMessageId(MessageId.earliest).create()) {
Assert.assertFalse(reader.hasMessageAvailable());
Assert.assertFalse(reader.hasMessageAvailableAsync().get(10, TimeUnit.SECONDS));
}
try (Reader<byte[]> reader = pulsarClient.newReader()
.topic(topic).startMessageId(MessageId.earliest).create()) {
try (Producer<byte[]> producer = pulsarClient.newProducer().topic(topic).create()) {
for (int i = 0; i < msgNum; i++) {
producer.newMessage().key(content + i)
.value((content + i).getBytes(StandardCharsets.UTF_8)).send();
}
}
// Should have message available
Assert.assertTrue(reader.hasMessageAvailableAsync().get());
try {
// Should have message available too
Assert.assertTrue(reader.hasMessageAvailable());
} catch (PulsarClientException e) {
fail("Expect success but failed.", e);
}
List<Message<byte[]>> msgs = Collections.synchronizedList(new ArrayList<>());
CountDownLatch latch = new CountDownLatch(1);
readMessageUseAsync(reader, msgs, latch);
latch.await();
Assert.assertEquals(msgs.size(), msgNum);
}
}
private static <T> void readMessageUseAsync(Reader<T> reader, List<Message<T>> msgs, CountDownLatch latch) {
reader.hasMessageAvailableAsync().thenAccept(hasMessageAvailable -> {
if (hasMessageAvailable) {
reader.readNextAsync().whenComplete((msg, ex) -> {
if (ex != null) {
log.error("Read message failed.", ex);
latch.countDown();
return;
}
msgs.add(msg);
readMessageUseAsync(reader, msgs, latch);
});
} else {
latch.countDown();
}
}).exceptionally(throwable -> {
log.error("Read message failed.", throwable);
latch.countDown();
return null;
});
}
@Test(timeOut = 10000)
public void testReadMessageWithBatchingWithMessageInclusive() throws Exception {
String topic = "persistent://my-property/my-ns/my-reader-topic-with-batching-inclusive" + UUID.randomUUID();
int topicNum = 3;
int msgNum = 15;
admin.topics().createPartitionedTopic(topic, topicNum);
Set<String> keys = publishMessages(topic, msgNum, true);
Reader<byte[]> reader = pulsarClient.newReader().topic(topic).startMessageId(MessageId.latest)
.startMessageIdInclusive().readerName(subscription).create();
while (reader.hasMessageAvailable()) {
keys.remove(reader.readNext(2, TimeUnit.SECONDS).getKey());
}
// start from latest with start message inclusive should only read the last 3 message from 3 partition
Assert.assertEquals(keys.size(), msgNum - topicNum);
Assert.assertFalse(keys.contains("key14"));
Assert.assertFalse(keys.contains("key13"));
Assert.assertFalse(keys.contains("key12"));
Assert.assertFalse(reader.hasMessageAvailable());
reader.close();
}
@Test(timeOut = 10000)
public void testReaderWithTimeLong() throws Exception {
String ns = "my-property/my-ns";
String topic = "persistent://" + ns + "/testReadFromPartition" + UUID.randomUUID();
admin.topics().createPartitionedTopic(topic, 3);
RetentionPolicies retention = new RetentionPolicies(-1, -1);
admin.namespaces().setRetention(ns, retention);
ProducerBuilder<byte[]> produceBuilder = pulsarClient.newProducer();
produceBuilder.topic(topic);
produceBuilder.enableBatching(false);
Producer<byte[]> producer = produceBuilder.create();
int totalMsg = 10;
// (1) Publish 10 messages with publish-time 5 HOUR back
long oldMsgPublishTime = System.currentTimeMillis() - TimeUnit.HOURS.toMillis(5); // 5 hours old
for (int i = 0; i < totalMsg; i++) {
TypedMessageBuilderImpl<byte[]> msg = (TypedMessageBuilderImpl<byte[]>) producer.newMessage()
.value(("old" + i).getBytes());
msg.getMetadataBuilder()
.setPublishTime(oldMsgPublishTime)
.setSequenceId(i)
.setProducerName(producer.getProducerName())
.setReplicatedFrom("us-west1");
msg.send();
}
// (2) Publish 10 messages with publish-time 1 HOUR back
long newMsgPublishTime = System.currentTimeMillis() - TimeUnit.HOURS.toMillis(1); // 1 hour old
MessageId firstMsgId = null;
for (int i = 0; i < totalMsg; i++) {
TypedMessageBuilderImpl<byte[]> msg = (TypedMessageBuilderImpl<byte[]>) producer.newMessage()
.value(("new" + i).getBytes());
msg.getMetadataBuilder()
.setPublishTime(newMsgPublishTime)
.setProducerName(producer.getProducerName())
.setReplicatedFrom("us-west1");
MessageId msgId = msg.send();
if (firstMsgId == null) {
firstMsgId = msgId;
}
}
// (3) Create reader and set position 1 hour back so, it should only read messages which are 2 hours old which
// published on step 2
Reader<byte[]> reader = pulsarClient.newReader().topic(topic)
.startMessageFromRollbackDuration(2, TimeUnit.HOURS).create();
List<MessageId> receivedMessageIds = Lists.newArrayList();
while (reader.hasMessageAvailable()) {
Message<byte[]> msg = reader.readNext(1, TimeUnit.SECONDS);
if (msg == null) {
break;
}
receivedMessageIds.add(msg.getMessageId());
}
assertEquals(receivedMessageIds.size(), totalMsg);
restartBroker();
assertFalse(reader.hasMessageAvailable());
reader.close();
producer.close();
}
@Test(timeOut = 10000)
public void testRemoveSubscriptionForReaderNeedRemoveCursor() throws IOException, PulsarAdminException {
final String topic = "persistent://my-property/my-ns/testRemoveSubscriptionForReaderNeedRemoveCursor"
+ UUID.randomUUID();
admin.topics().createPartitionedTopic(topic, 3);
@Cleanup
Reader<byte[]> reader1 = pulsarClient.newReader()
.topic(topic)
.startMessageId(MessageId.earliest)
.create();
@Cleanup
Reader<byte[]> reader2 = pulsarClient.newReader()
.topic(topic)
.startMessageId(MessageId.earliest)
.create();
Assert.assertEquals(admin.topics().getSubscriptions(topic).size(), 2);
for (PersistentTopicInternalStats value : admin.topics().getPartitionedInternalStats(topic).partitions.values()) {
Assert.assertEquals(value.cursors.size(), 2);
}
reader1.close();
Assert.assertEquals(admin.topics().getSubscriptions(topic).size(), 1);
for (PersistentTopicInternalStats value : admin.topics().getPartitionedInternalStats(topic).partitions.values()) {
Assert.assertEquals(value.cursors.size(), 1);
}
reader2.close();
Assert.assertEquals(admin.topics().getSubscriptions(topic).size(), 0);
for (PersistentTopicInternalStats value : admin.topics().getPartitionedInternalStats(topic).partitions.values()) {
Assert.assertEquals(value.cursors.size(), 0);
}
}
@Test(timeOut = 10000)
public void testMultiReaderSeek() throws Exception {
String topic = "persistent://my-property/my-ns/testKeyHashRangeReader" + UUID.randomUUID();
admin.topics().createPartitionedTopic(topic, 3);
publishMessages(topic,100,false);
}
@Test
public void testMultiTopicSeekByFunction() throws Exception {
final String topicName = "persistent://my-property/my-ns/test" + UUID.randomUUID();
int partitionNum = 4;
int msgNum = 20;
admin.topics().createPartitionedTopic(topicName, partitionNum);
publishMessages(topicName, msgNum, false);
Reader<byte[]> reader = pulsarClient
.newReader().startMessageIdInclusive().startMessageId(MessageId.latest)
.topic(topicName).subscriptionName("my-sub").create();
long now = System.currentTimeMillis();
reader.seek((topic) -> now);
assertNull(reader.readNext(1, TimeUnit.SECONDS));
reader.seek((topic) -> {
TopicName name = TopicName.get(topic);
switch (name.getPartitionIndex()) {
case 0:
return MessageId.latest;
case 1:
return MessageId.earliest;
case 2:
return now;
case 3:
return now - 999999;
default:
return null;
}
});
int count = 0;
while (true) {
Message<byte[]> message = reader.readNext(1, TimeUnit.SECONDS);
if (message == null) {
break;
}
count++;
}
int msgNumInPartition0 = 0;
int msgNumInPartition1 = msgNum / partitionNum;
int msgNumInPartition2 = 0;
int msgNumInPartition3 = msgNum / partitionNum;
assertEquals(count, msgNumInPartition0 + msgNumInPartition1 + msgNumInPartition2 + msgNumInPartition3);
}
@Test
public void testMultiTopicSeekByFunctionWithException() throws Exception {
final String topicName = "persistent://my-property/my-ns/test" + UUID.randomUUID();
int partitionNum = 4;
int msgNum = 20;
admin.topics().createPartitionedTopic(topicName, partitionNum);
publishMessages(topicName, msgNum, false);
Reader<byte[]> reader = pulsarClient
.newReader().startMessageIdInclusive().startMessageId(MessageId.latest)
.topic(topicName).subscriptionName("my-sub").create();
long now = System.currentTimeMillis();
reader.seek((topic) -> now);
assertNull(reader.readNext(1, TimeUnit.SECONDS));
try {
reader.seek((topic) -> {
TopicName name = TopicName.get(topic);
switch (name.getPartitionIndex()) {
case 0:
throw new RuntimeException("test");
case 1:
return MessageId.latest;
case 2:
return MessageId.earliest;
case 3:
return now - 999999;
default:
return null;
}
});
} catch (Exception e) {
assertEquals(e.getMessage(), "test");
assertTrue(e instanceof RuntimeException);
}
}
@Test(timeOut = 20000)
public void testMultiTopic() throws Exception {
final String topic = "persistent://my-property/my-ns/topic" + UUID.randomUUID();
final String topic2 = "persistent://my-property/my-ns/topic2" + UUID.randomUUID();
admin.topics().createPartitionedTopic(topic2, 3);
final String topic3 = "persistent://my-property/my-ns/topic3" + UUID.randomUUID();
List<String> topics = Arrays.asList(topic, topic2, topic3);
PulsarClientImpl client = (PulsarClientImpl) pulsarClient;
Reader<String> reader = pulsarClient.newReader(Schema.STRING)
.startMessageId(MessageId.earliest)
.topics(topics).readerName("my-reader").create();
// create producer and send msg
List<Producer<String>> producerList = new ArrayList<>();
for (String topicName : topics) {
producerList.add(pulsarClient.newProducer(Schema.STRING).topic(topicName).create());
}
int msgNum = 10;
Set<String> messages = new HashSet<>();
for (int i = 0; i < producerList.size(); i++) {
Producer<String> producer = producerList.get(i);
for (int j = 0; j < msgNum; j++) {
String msg = i + "msg" + j;
producer.send(msg);
messages.add(msg);
}
}
// receive messages
while (reader.hasMessageAvailable()) {
messages.remove(reader.readNext(5, TimeUnit.SECONDS).getValue());
}
assertEquals(messages.size(), 0);
assertEquals(client.consumersCount(), 1);
// clean up
for (Producer<String> producer : producerList) {
producer.close();
}
reader.close();
Awaitility.await().untilAsserted(() -> assertEquals(client.consumersCount(), 0));
}
@Test(timeOut = 20000)
public void testMultiNonPartitionedTopicWithStartMessageId() throws Exception {
final String topic1 = "persistent://my-property/my-ns/topic1" + UUID.randomUUID();
final String topic2 = "persistent://my-property/my-ns/topic2" + UUID.randomUUID();
List<String> topics = Arrays.asList(topic1, topic2);
PulsarClientImpl client = (PulsarClientImpl) pulsarClient;
// create producer and send msg
List<Producer<String>> producerList = new ArrayList<>();
for (String topicName : topics) {
producerList.add(pulsarClient.newProducer(Schema.STRING).topic(topicName).create());
}
int msgNum = 10;
Set<String> messages = new HashSet<>();
for (int i = 0; i < producerList.size(); i++) {
Producer<String> producer = producerList.get(i);
for (int j = 0; j < msgNum; j++) {
String msg = i + "msg" + j;
producer.send(msg);
messages.add(msg);
}
}
Reader<String> reader = pulsarClient.newReader(Schema.STRING)
.startMessageId(MessageId.earliest)
.topics(topics).readerName("my-reader").create();
// receive messages
while (reader.hasMessageAvailable()) {
messages.remove(reader.readNext(5, TimeUnit.SECONDS).getValue());
}
assertEquals(messages.size(), 0);
assertEquals(client.consumersCount(), 1);
// clean up
for (Producer<String> producer : producerList) {
producer.close();
}
reader.close();
Awaitility.await().untilAsserted(() -> assertEquals(client.consumersCount(), 0));
}
@Test(timeOut = 20000)
public void testMultiNonPartitionedTopicWithRollbackDuration() throws Exception {
final String topic1 = "persistent://my-property/my-ns/topic1" + UUID.randomUUID();
final String topic2 = "persistent://my-property/my-ns/topic2" + UUID.randomUUID();
List<String> topics = Arrays.asList(topic1, topic2);
PulsarClientImpl client = (PulsarClientImpl) pulsarClient;
// create producer and send msg
List<Producer<String>> producerList = new ArrayList<>();
for (String topicName : topics) {
producerList.add(pulsarClient.newProducer(Schema.STRING).topic(topicName).create());
}
int totalMsg = 10;
Set<String> messages = new HashSet<>();
long oldMsgPublishTime = System.currentTimeMillis() - TimeUnit.HOURS.toMillis(5); // 5 hours old
long newMsgPublishTime = System.currentTimeMillis() - TimeUnit.HOURS.toMillis(1); // 5 hours old
for (int i = 0; i < producerList.size(); i++) {
Producer<String> producer = producerList.get(i);
// (1) Publish 10 messages with publish-time 5 HOUR back
for (int j = 0; j < totalMsg; j++) {
TypedMessageBuilderImpl<String> msg = (TypedMessageBuilderImpl<String>) producer.newMessage()
.value(i + "-old-msg-" + j);
msg.getMetadataBuilder()
.setPublishTime(oldMsgPublishTime)
.setProducerName(producer.getProducerName())
.setReplicatedFrom("us-west1");
msg.send();
messages.add(msg.getMessage().getValue());
}
// (2) Publish 10 messages with publish-time 1 HOUR back
for (int j = 0; j < totalMsg; j++) {
TypedMessageBuilderImpl<String> msg = (TypedMessageBuilderImpl<String>) producer.newMessage()
.value(i + "-new-msg-" + j);
msg.getMetadataBuilder()
.setPublishTime(newMsgPublishTime)
.setProducerName(producer.getProducerName())
.setReplicatedFrom("us-west1");
msg.send();
messages.add(msg.getMessage().getValue());
}
}
Reader<String> reader = pulsarClient.newReader(Schema.STRING)
.startMessageFromRollbackDuration(2, TimeUnit.HOURS)
.topics(topics).readerName("my-reader").create();
// receive messages
while (reader.hasMessageAvailable()) {
messages.remove(reader.readNext(5, TimeUnit.SECONDS).getValue());
}
assertEquals(messages.size(), 2 * totalMsg);
for (String message : messages) {
assertTrue(message.contains("old-msg"));
}
assertEquals(client.consumersCount(), 1);
// clean up
for (Producer<String> producer : producerList) {
producer.close();
}
reader.close();
Awaitility.await().untilAsserted(() -> assertEquals(client.consumersCount(), 0));
}
@Test(timeOut = 10000)
public void testKeyHashRangeReader() throws Exception {
final List<String> keys = Arrays.asList("0", "1", "2", "3", "4", "5", "6", "7", "8", "9");
final String topic = "persistent://my-property/my-ns/testKeyHashRangeReader" + UUID.randomUUID();
admin.topics().createPartitionedTopic(topic, 3);
try {
pulsarClient.newReader()
.topic(topic)
.startMessageId(MessageId.earliest)
.keyHashRange(Range.of(0, 10000), Range.of(8000, 12000))
.create();
fail("should failed with unexpected key hash range");
} catch (IllegalArgumentException e) {
}
try {
pulsarClient.newReader()
.topic(topic)
.startMessageId(MessageId.earliest)
.keyHashRange(Range.of(30000, 20000))
.create();
fail("should failed with unexpected key hash range");
} catch (IllegalArgumentException e) {
}
try {
pulsarClient.newReader()
.topic(topic)
.startMessageId(MessageId.earliest)
.keyHashRange(Range.of(80000, 90000))
.create();
fail("should failed with unexpected key hash range");
} catch (IllegalArgumentException e) {
}
@Cleanup
Reader<String> reader = pulsarClient.newReader(Schema.STRING)
.topic(topic)
.startMessageId(MessageId.earliest)
.keyHashRange(Range.of(0, StickyKeyConsumerSelector.DEFAULT_RANGE_SIZE / 2))
.create();
@Cleanup
Producer<String> producer = pulsarClient.newProducer(Schema.STRING)
.topic(topic)
.enableBatching(false)
.create();
int expectedMessages = 0;
for (String key : keys) {
int slot = Murmur3_32Hash.getInstance().makeHash(key.getBytes())
% StickyKeyConsumerSelector.DEFAULT_RANGE_SIZE;
if (slot <= StickyKeyConsumerSelector.DEFAULT_RANGE_SIZE / 2) {
expectedMessages++;
}
producer.newMessage()
.key(key)
.value(key)
.send();
}
List<String> receivedMessages = new ArrayList<>();
Message<String> msg;
do {
msg = reader.readNext(1, TimeUnit.SECONDS);
if (msg != null) {
receivedMessages.add(msg.getValue());
}
} while (msg != null);
assertTrue(expectedMessages > 0);
assertEquals(receivedMessages.size(), expectedMessages);
for (String receivedMessage : receivedMessages) {
assertTrue(Integer.parseInt(receivedMessage) <= StickyKeyConsumerSelector.DEFAULT_RANGE_SIZE / 2);
}
}
private void testReadMessages(String topic, boolean enableBatch) throws Exception {
int numKeys = 9;
Set<String> keys = publishMessages(topic, numKeys, enableBatch);
Reader<byte[]> reader = pulsarClient.newReader()
.topic(topic)
.startMessageId(MessageId.earliest)
.readerName(subscription)
.create();
while (reader.hasMessageAvailable()) {
keys.remove(reader.readNext(5, TimeUnit.SECONDS).getKey());
}
Assert.assertEquals(keys.size(), 0);
Reader<byte[]> readLatest = pulsarClient.newReader().topic(topic).startMessageId(MessageId.latest)
.readerName(subscription + "latest").create();
Assert.assertFalse(readLatest.hasMessageAvailable());
}
private Set<String> publishMessages(String topic, int count, boolean enableBatch) throws Exception {
Set<String> keys = new HashSet<>();
ProducerBuilder<byte[]> builder = pulsarClient.newProducer();
builder.messageRoutingMode(MessageRoutingMode.RoundRobinPartition);
// disable periodical flushing
builder.batchingMaxPublishDelay(1, TimeUnit.DAYS);
builder.topic(topic);
if (enableBatch) {
builder.enableBatching(true);
builder.batchingMaxMessages(count);
} else {
builder.enableBatching(false);
builder.maxPendingMessages(1);
}
try (Producer<byte[]> producer = builder.create()) {
List<CompletableFuture<MessageId>> list = new ArrayList<>();
for (int i = 0; i < count; i++) {
String key = "key" + i;
byte[] data = ("my-message-" + i).getBytes();
if (enableBatch) {
list.add(producer.newMessage().key(key).value(data).sendAsync());
} else {
producer.newMessage().key(key).value(data).send();
}
keys.add(key);
}
producer.flush();
FutureUtil.waitForAll(list).get();
}
return keys;
}
}