Pulsar 入門實戰(5)--Java 操作 Pulsar

且行且码發表於2024-11-17

本文主要介紹使用 Java 來操作 Pulsar，文中所使用到的軟體版本：Java 17.0.7(Pulsar 服務使用)、Java 1.8.0_341(客戶端使用)、Pulsar 3.3.0、pulsar-client 3.3.0。

1、引入依賴

<dependency>
    <groupId>org.apache.pulsar</groupId>
    <artifactId>pulsar-client</artifactId>
    <version>3.3.0</version>
</dependency>
<dependency>
    <groupId>org.apache.pulsar</groupId>
    <artifactId>pulsar-client-admin</artifactId>
    <version>3.3.0</version>
</dependency>

2、初始化 PulsarClient 和 PulsarAdmin

PulsarClient:

@Before
public void before() throws PulsarClientException {
    client = PulsarClient.builder()
            .serviceUrl("pulsar://10.49.196.30:6650,10.49.196.31:6650,10.49.196.32:6650")
            .build();
}

PulsarAdmin:

@Before
public void before() throws PulsarClientException {
    admin = PulsarAdmin.builder()
            .serviceHttpUrl("http://10.49.196.30:8080,10.49.196.31:8080,10.49.196.32:8080")
            .build();
}

3、消費者

3.1、同步消費

@Test
public void sync() throws PulsarClientException {
    Consumer<String> consumer = client.newConsumer(Schema.STRING)
            .topic("my-topic") //主題
            .subscriptionName("my-subscription") //訂閱名稱
            .subscriptionType(SubscriptionType.Shared) //訂閱模式
            .subscribe();

    while (true) {
        Message<String> message = consumer.receive();
        try {
            log.info("topicName={},value={}", message.getTopicName(), message.getValue());
            consumer.acknowledge(message);
        } catch (Exception e) {
            consumer.negativeAcknowledge(message);
        }
    }
}

3.2、非同步消費

public void async() throws InterruptedException {
    client.newConsumer(Schema.STRING)
            .topic("my-topic2")
            .subscriptionName("my-subscription")
            .subscriptionType(SubscriptionType.Shared)
            .subscribeAsync()
            .thenAccept(this::receiveAsync);

    Thread.sleep(1000 * 500);
}

private void receiveAsync(Consumer<String> consumer) {
    consumer.receiveAsync().thenAccept(message -> {
        try {
            log.info("messageId={},value={}", message.getMessageId(), message.getValue());
            consumer.acknowledge(message);
        } catch (Exception e) {
            consumer.negativeAcknowledge(message);
        }
        receiveAsync(consumer);
    });
}

3.3、使用 MessageListener

@Test
public void messageListener() throws Exception {
    PulsarClient client = PulsarClient.builder()
            .serviceUrl("pulsar://10.49.196.30:6650,10.49.196.31:6650,10.49.196.32:6650")
            .listenerThreads(3)
            .build();
    MessageListener<String> messageListener = (consumer, msg) -> {
        try {
            log.info("messageId={},value={}", msg.getMessageId(), msg.getValue());
            consumer.acknowledge(msg);
        } catch (Exception e) {
            consumer.negativeAcknowledge(msg);
        }
    };

    client.newConsumer(Schema.STRING)
            .topic("my-topic")
            .subscriptionName("my-subscription")
            .subscriptionType(SubscriptionType.Shared)
            .messageListener(messageListener)
            .subscribe();
    Thread.sleep(1000 * 500);
}

3.4、重試信主題

/**
 * 重試信主題
 * 處理失敗的訊息會進入重試信主題，達到最大重試次數後進入死信主題
 */
@Test
public void retryTopic() throws Exception {
    Consumer<String> consumer = client.newConsumer(Schema.STRING)
            .topic("my-topic-r")
            .subscriptionName("my-subscription")
            .subscriptionType(SubscriptionType.Shared)
            .enableRetry(true)
            .deadLetterPolicy(DeadLetterPolicy.builder()
                    .maxRedeliverCount(5)
                    .build())
            .subscribe();
    while (true) {
        Message<String> message = consumer.receive();
        try {
            log.info("messageId={},topicName={},value={}", message.getMessageId(), message.getTopicName(), message.getValue());
            //TODO:業務處理，可能發生異常
            //throw new RuntimeException();
            consumer.acknowledge(message);
        } catch (Exception e) {
            log.error("", e);
            consumer.reconsumeLater(message, 5L, TimeUnit.SECONDS);
        }
    }
}

3.5、死信主題

/**
 * 死信主題
 * 由確認超時、負面確認或重試信主題 三種情況訊息處理失敗後，重試最大次數後訊息會進入死信主題
 */
@Test
public void deadTopic() throws Exception {
    Consumer<String> consumer = client.newConsumer(Schema.STRING)
            .topic("my-topic-d")
            .subscriptionName("my-subscription")
            .subscriptionType(SubscriptionType.Shared)
            .deadLetterPolicy(DeadLetterPolicy.builder()
                    .maxRedeliverCount(5)
                    .initialSubscriptionName("init-sub")
                    .build())
            .subscribe();
    while (true) {
        Message<String> message = consumer.receive();
        try {
            log.info("messageId={},topicName={},value={}", message.getMessageId(), message.getTopicName(), message.getValue());
            //TODO:業務處理，可能發生異常
            //throw new RuntimeException();
            consumer.acknowledge(message);
        } catch (Exception e) {
            log.error("", e);
            consumer.negativeAcknowledge(message);
        }
    }
}

/**
 * 訂閱死信佇列，處理其中的訊息
 */
@Test
public void consumerDeadTopic() throws Exception {
    Consumer<String> consumer = client.newConsumer(Schema.STRING)
            .topic("my-topic-d-my-subscription-DLQ")
            .subscriptionName("init-sub")
            .subscriptionType(SubscriptionType.Shared)
            .subscribe();
    while (true) {
        Message<String> message = consumer.receive();
        try {
            log.info("messageId={},topicName={},value={}", message.getMessageId(), message.getTopicName(), message.getValue());
        } catch (Exception e) {
            log.error("", e);
        }
        consumer.acknowledge(message);
    }
}

3.6、完整程式碼

package com.abc.demo.pulsar;

import lombok.extern.slf4j.Slf4j;
import org.apache.pulsar.client.api.*;
import org.junit.Before;
import org.junit.Test;

import java.util.concurrent.TimeUnit;

@Slf4j
public class ConsumerCase {
    private PulsarClient client;

    @Before
    public void before() throws PulsarClientException {
        client = PulsarClient.builder()
                .serviceUrl("pulsar://10.49.196.30:6650,10.49.196.31:6650,10.49.196.32:6650")
                .build();
    }

    @Test
    public void sync() throws PulsarClientException {
        Consumer<String> consumer = client.newConsumer(Schema.STRING)
                .topic("my-topic") //主題
                .subscriptionName("my-subscription") //訂閱名稱
                .subscriptionType(SubscriptionType.Shared) //訂閱模式
                .subscribe();

        while (true) {
            Message<String> message = consumer.receive();
            try {
                log.info("topicName={},value={}", message.getTopicName(), message.getValue());
                consumer.acknowledge(message);
            } catch (Exception e) {
                consumer.negativeAcknowledge(message);
            }
        }
    }

    @Test
    public void async() throws InterruptedException {
        client.newConsumer(Schema.STRING)
                .topic("my-topic2")
                .subscriptionName("my-subscription")
                .subscriptionType(SubscriptionType.Shared)
                .subscribeAsync()
                .thenAccept(this::receiveAsync);

        Thread.sleep(1000 * 500);
    }

    private void receiveAsync(Consumer<String> consumer) {
        consumer.receiveAsync().thenAccept(message -> {
            try {
                log.info("messageId={},value={}", message.getMessageId(), message.getValue());
                consumer.acknowledge(message);
            } catch (Exception e) {
                consumer.negativeAcknowledge(message);
            }
            receiveAsync(consumer);
        });
    }

    @Test
    public void messageListener() throws Exception {
        PulsarClient client = PulsarClient.builder()
                .serviceUrl("pulsar://10.49.196.30:6650,10.49.196.31:6650,10.49.196.32:6650")
                .listenerThreads(3)
                .build();
        MessageListener<String> messageListener = (consumer, msg) -> {
            try {
                log.info("messageId={},value={}", msg.getMessageId(), msg.getValue());
                consumer.acknowledge(msg);
            } catch (Exception e) {
                consumer.negativeAcknowledge(msg);
            }
        };

        client.newConsumer(Schema.STRING)
                .topic("my-topic")
                .subscriptionName("my-subscription")
                .subscriptionType(SubscriptionType.Shared)
                .messageListener(messageListener)
                .subscribe();
        Thread.sleep(1000 * 500);
    }

    /**
     * 重試信主題
     * 處理失敗的訊息會進入重試信主題，達到最大重試次數後進入死信主題
     */
    @Test
    public void retryTopic() throws Exception {
        Consumer<String> consumer = client.newConsumer(Schema.STRING)
                .topic("my-topic-r")
                .subscriptionName("my-subscription")
                .subscriptionType(SubscriptionType.Shared)
                .enableRetry(true)
                .deadLetterPolicy(DeadLetterPolicy.builder()
                        .maxRedeliverCount(5)
                        .build())
                .subscribe();
        while (true) {
            Message<String> message = consumer.receive();
            try {
                log.info("messageId={},topicName={},value={}", message.getMessageId(), message.getTopicName(), message.getValue());
                //TODO:業務處理，可能發生異常
                //throw new RuntimeException();
                consumer.acknowledge(message);
            } catch (Exception e) {
                log.error("", e);
                consumer.reconsumeLater(message, 5L, TimeUnit.SECONDS);
            }
        }
    }

    /**
     * 死信主題
     * 由確認超時、負面確認或重試信主題 三種情況訊息處理失敗後，重試最大次數後訊息會進入死信主題
     */
    @Test
    public void deadTopic() throws Exception {
        Consumer<String> consumer = client.newConsumer(Schema.STRING)
                .topic("my-topic-d")
                .subscriptionName("my-subscription")
                .subscriptionType(SubscriptionType.Shared)
                .deadLetterPolicy(DeadLetterPolicy.builder()
                        .maxRedeliverCount(5)
                        .initialSubscriptionName("init-sub")
                        .build())
                .subscribe();
        while (true) {
            Message<String> message = consumer.receive();
            try {
                log.info("messageId={},topicName={},value={}", message.getMessageId(), message.getTopicName(), message.getValue());
                //TODO:業務處理，可能發生異常
                //throw new RuntimeException();
                consumer.acknowledge(message);
            } catch (Exception e) {
                log.error("", e);
                consumer.negativeAcknowledge(message);
            }
        }
    }

    /**
     * 訂閱死信佇列，處理其中的訊息
     */
    @Test
    public void consumerDeadTopic() throws Exception {
        Consumer<String> consumer = client.newConsumer(Schema.STRING)
                .topic("my-topic-d-my-subscription-DLQ")
                .subscriptionName("init-sub")
                .subscriptionType(SubscriptionType.Shared)
                .subscribe();
        while (true) {
            Message<String> message = consumer.receive();
            try {
                log.info("messageId={},topicName={},value={}", message.getMessageId(), message.getTopicName(), message.getValue());
            } catch (Exception e) {
                log.error("", e);
            }
            consumer.acknowledge(message);
        }
    }
}

ConsumerCase.java

4、Reader

@Test
public void reader() throws Exception {
    //MessageId messageId = MessageId.fromByteArray(Base64.getDecoder().decode("CBcQBTAA"));
    MessageId messageId = MessageId.earliest;
    Reader reader = client.newReader(Schema.STRING)
            .topic("my-topic")
            .startMessageId(messageId)
            .create();

    while (true) {
        Message msg = reader.readNext();
        log.info("messageId={},messageIdBase64={},value={}", msg.getMessageId(), Base64.getEncoder().encodeToString(msg.getMessageId().toByteArray()), msg.getValue());
    }
}

完整程式碼：

package com.abc.demo.pulsar;

import lombok.extern.slf4j.Slf4j;
import org.apache.pulsar.client.api.*;
import org.junit.Before;
import org.junit.Test;

import java.util.Base64;

@Slf4j
public class ReaderCase {
    private PulsarClient client;

    @Before
    public void before() throws PulsarClientException {
        client = PulsarClient.builder()
                .serviceUrl("pulsar://10.49.196.30:6650,10.49.196.31:6650,10.49.196.32:6650")
                .build();
    }

    @Test
    public void reader() throws Exception {
        //MessageId messageId = MessageId.fromByteArray(Base64.getDecoder().decode("CBcQBTAA"));
        MessageId messageId = MessageId.earliest;
        Reader reader = client.newReader(Schema.STRING)
                .topic("my-topic")
                .startMessageId(messageId)
                .create();

        while (true) {
            Message msg = reader.readNext();
            log.info("messageId={},messageIdBase64={},value={}", msg.getMessageId(), Base64.getEncoder().encodeToString(msg.getMessageId().toByteArray()), msg.getValue());
        }
    }
}

ReaderCase.java

5、生產者

5.1、同步傳送

@Test
public void sync() throws PulsarClientException {
    Producer<String> producer = client.newProducer(Schema.STRING)
            .topic("my-topic-d")
            .create();
    for (int i = 0; i < 3; i++) {
        MessageId messageId = producer.send(("hello" + i));
        log.info("messageId={}", messageId);
    }
    producer.close();
}

5.2、非同步傳送

@Test
public void async() throws InterruptedException {
    client.newProducer(Schema.STRING)
            .topic("my-topic2")
            .createAsync()
            .thenAccept(producer -> {
                for (int i = 0; i < 10; i++) {
                    producer.sendAsync("hello" + i).thenAccept(messageId -> {
                                log.info("messageId={}", messageId);
                    });
                }
            });
    Thread.sleep(1000 * 5);
}

5.3、詳細設定訊息

@Test
public void configMessage() throws PulsarClientException {
    Producer<byte[]> producer = client.newProducer()
            .topic("my-topic")
            .create();
    MessageId messageId = producer.newMessage(Schema.STRING)
            .key("my-key") //設定訊息key
            .eventTime(System.currentTimeMillis()) //設定事件事件
            .sequenceId(123) //設定 sequenceId
            .deliverAfter(1, TimeUnit.MINUTES) //延遲投遞訊息
            .property("my-key", "my-value") //自定義屬性
            .value("content")
            .send();
    log.info("messageId={}", messageId);
    producer.close();
}

5.4、完整程式碼

package com.abc.demo.pulsar;

import lombok.extern.slf4j.Slf4j;
import org.apache.pulsar.client.api.*;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;


@Slf4j
public class ProducerCase {
    private PulsarClient client;

    @Before
    public void before() throws PulsarClientException {
        client = PulsarClient.builder()
                //.serviceUrl("pulsar://10.49.196.33:6650")
                .serviceUrl("pulsar://10.49.196.30:6650,10.49.196.31:6650,10.49.196.32:6650")
                .build();
    }

    @After
    public void after() throws PulsarClientException {
        client.close();
    }

    @Test
    public void sync() throws PulsarClientException {
        Producer<String> producer = client.newProducer(Schema.STRING)
                .topic("my-topic-d")
                .create();
        for (int i = 0; i < 3; i++) {
            MessageId messageId = producer.send(("hello" + i));
            log.info("messageId={}", messageId);
        }
        producer.close();
    }

    @Test
    public void async() throws InterruptedException {
        client.newProducer(Schema.STRING)
                .topic("my-topic2")
                .createAsync()
                .thenAccept(producer -> {
                    for (int i = 0; i < 10; i++) {
                        producer.sendAsync("hello" + i).thenAccept(messageId -> {
                                    log.info("messageId={}", messageId);
                        });
                    }
                });
        Thread.sleep(1000 * 5);
    }

    @Test
    public void configMessage() throws PulsarClientException {
        Producer<byte[]> producer = client.newProducer()
                .topic("my-topic")
                .create();
        MessageId messageId = producer.newMessage(Schema.STRING)
                .key("my-key") //設定訊息key
                .eventTime(System.currentTimeMillis()) //設定事件事件
                .sequenceId(123) //設定 sequenceId
                .deliverAfter(1, TimeUnit.MINUTES) //延遲投遞訊息
                .property("my-key", "my-value") //自定義屬性
                .value("content")
                .send();
        log.info("messageId={}", messageId);
        producer.close();
    }
}

ProducerCase.java

6、Admin

6.1、Brokers

6.1.1、列出活動 broker

admin.brokers().getActiveBrokers(clusterName)

6.1.2、列出 broker 的名稱空間

admin.brokers().getOwnedNamespaces(cluster,brokerUrl);

6.1.3、獲取動態配置名稱

admin.brokers().getDynamicConfigurationNames();

6.1.4、更新動態配置

admin.brokers().updateDynamicConfiguration(configName, configValue);

6.1.5、獲取已經更新過的動態配置

admin.brokers().getAllDynamicConfigurations();

6.1.6、獲取 leader broker

admin.brokers().getLeaderBroker()

6.2、Clusters

6.2.1、獲取叢集配置資訊

admin.clusters().getCluster(clusterName);

6.2.2、獲取叢集列表

admin.clusters().getClusters();

6.3、Tenant

6.3.1、列出租戶

admin.tenants().getTenants();

6.3.2、建立租戶

admin.tenants().createTenant(tenantName, tenantInfo);

6.3.3、獲取租戶配置資訊

admin.tenants().getTenantInfo(tenantName);

6.3.4、刪除租戶

admin.Tenants().deleteTenant(tenantName);

6.3.5、更新租戶

admin.tenants().updateTenant(tenantName, tenantInfo);

6.4、Namespaces

6.4.1、建立名稱空間

admin.namespaces().createNamespace(namespace);

6.4.2、獲取名稱空間策略

admin.namespaces().getPolicies(namespace);

6.4.3、列出名稱空間

admin.namespaces().getNamespaces(tenant);

6.4.4、刪除名稱空間

admin.namespaces().deleteNamespace(namespace);

6.5、Topics

6.5.1、檢視訂閱的待消費訊息(不會消費訊息)

admin.topics().peekMessages(topic, subName, numMessages);

6.5.2、透過訊息 ID 獲取訊息

admin.topics().getMessageById(topic, ledgerId, entryId);

6.5.3、透過相對於最早或最新訊息的位置來查詢訊息

admin.topics().examineMessage(topic, "latest", 1);

6.5.4、透過時間獲取訊息的 ID

admin.topics().getMessageIdByTimestamp(topic, timestamp);

6.5.5、跳過特定主題的某個訂閱中的若干條未消費訊息

admin.topics().skipMessages(topic, subName, numMessages);

6.5.6、跳過特定主題的某個訂閱中的所有未消費訊息

admin.topics().skipAllMessages(topic, subName);

6.5.7、根據時間重置遊標

admin.topics().resetCursor(topic, subName, timestamp);

6.5.8、獲取主題所屬的 broker

admin.lookups().lookupTopic(topic);

6.5.9、獲取分割槽主題所屬的 broker

admin.lookups().lookupPartitionedTopic(topic);

6.5.10、獲取主題的訂閱資訊

admin.topics().getSubscriptions(topic);

6.5.11、獲取最新訊息的 ID

admin.topics().getLastMessage(topic);

6.5.12、建立非分割槽主題

admin.topics().createNonPartitionedTopic(topicName);

6.5.13、刪除非分割槽主題

admin.topics().delete(topic);

6.5.14、列出非分割槽主題

admin.topics().getList(namespace);

6.5.15、獲取非分割槽主題狀態

admin.topics().getStats(topic, false /* is precise backlog */);

6.5.16、獲取非分割槽主題內部狀態

admin.topics().getInternalStats(topic);

6.5.17、建立分割槽主題

admin.topics().createPartitionedTopic(topicName, numPartitions);

6.5.18、獲取分割槽主題後設資料資訊

admin.topics().getPartitionedTopicMetadata(topicName);

6.5.19、更新分割槽主題的分割槽數(只能比原來大)

admin.topics().updatePartitionedTopic(topic, numPartitions);

6.5.20、刪除分割槽主題

admin.topics().deletePartitionedTopic(topic);

6.5.21、列出分割槽主題

admin.topics().getPartitionedTopicList(namespace);

6.5.22、獲取分割槽主題狀態

admin.topics().getPartitionedStats(topic, true /* per partition */, false /* is precise backlog */);

6.5.23、獲取分割槽主題內部狀態

admin.topics().getPartitionedInternalStats(topic);

6.5.24、建立訂閱

admin.topics().createSubscription(topic, subscriptionName, MessageId.latest);

6.5.25、獲取訂閱

admin.topics().getSubscriptions(topic);

6.5.26、刪除訂閱

admin.topics().deleteSubscription(topic, subscriptionName);

6.6、完整程式碼

package com.abc.demo.pulsar;

import lombok.extern.slf4j.Slf4j;
import org.apache.pulsar.client.admin.PulsarAdmin;
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.PulsarClientException;
import org.apache.pulsar.common.policies.data.TenantInfoImpl;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.util.Collections;
import java.util.HashSet;

@Slf4j
public class AdminCase {
    private PulsarAdmin admin;

    @Before
    public void before() throws PulsarClientException {
        admin = PulsarAdmin.builder()
                .serviceHttpUrl("http://10.49.196.30:8080,10.49.196.31:8080,10.49.196.32:8080")
                .build();
    }

    @After
    public void after() {
        admin.close();
    }

    @Test
    public void broker() throws PulsarAdminException {
        log.info("getActiveBrokers={}", admin.brokers().getActiveBrokers());
        log.info("getOwnedNamespaces={}", admin.brokers().getOwnedNamespaces("pulsar-cluster-1", "app1:8080"));
        log.info("getDynamicConfigurationNames={}", admin.brokers().getDynamicConfigurationNames());
        admin.brokers().updateDynamicConfiguration("allowAutoTopicCreation", "true");
        log.info("getAllDynamicConfigurations={}", admin.brokers().getAllDynamicConfigurations());
        log.info("getLeaderBroker={}", admin.brokers().getLeaderBroker());
    }

    @Test
    public void clusters() throws PulsarAdminException {
        log.info("getCluster={}", admin.clusters().getCluster("pulsar-cluster-1"));
        log.info("getClusters={}", admin.clusters().getClusters());
    }
    
    @Test
    public void tenants() throws PulsarAdminException {
        log.info("getTenants={}", admin.tenants().getTenants());
        TenantInfoImpl tenantInfo = new TenantInfoImpl();
        tenantInfo.setAdminRoles(new HashSet<>());
        tenantInfo.setAllowedClusters(Collections.singleton("pulsar-cluster-1"));
        admin.tenants().createTenant("test-tenant", tenantInfo);
        log.info("getTenantInfo={}", admin.tenants().getTenantInfo("test-tenant"));
        admin.tenants().updateTenant("test-tenant", tenantInfo);
        admin.tenants().deleteTenant("test-tenant");
    }

    @Test
    public void namespaces() throws PulsarAdminException {
        admin.namespaces().createNamespace("public/test-ns");
        log.info("getPolicies={}", admin.namespaces().getPolicies("public/default"));
        log.info("getNamespaces={}", admin.namespaces().getNamespaces("public"));
        admin.namespaces().deleteNamespace("public/test-ns");
    }
    
    @Test
    public void topics() throws PulsarAdminException {
        log.info("peekMessages={}", admin.topics().peekMessages("persistent://public/default/my-topic", "my-subscription", 3));
        Message<byte[]> message = admin.topics().getMessageById("persistent://public/default/my-topic", 171, 16);
        log.info("getMessageById={}", new String(message.getData()));
        message = admin.topics().examineMessage("persistent://public/default/my-topic", "latest", 1);
        log.info("examineMessage={}", new String(message.getData()));
        log.info("getMessageIdByTimestamp={}", admin.topics().getMessageIdByTimestamp("persistent://public/default/my-topic", System.currentTimeMillis()));
        admin.topics().skipMessages("persistent://public/default/my-topic", "my-subscription", 1);
        admin.topics().skipAllMessages("persistent://public/default/my-topic", "my-subscription");
        admin.topics().resetCursor("persistent://public/default/my-topic", "my-subscription", System.currentTimeMillis() - 1000 * 60 * 15);
        log.info("lookupTopic={}", admin.lookups().lookupTopic("persistent://public/default/my-topic"));
        log.info("lookupPartitionedTopic={}", admin.lookups().lookupPartitionedTopic("persistent://public/default/my-topic2"));
        log.info("getSubscriptions={}", admin.topics().getSubscriptions("persistent://public/default/my-topic"));
        log.info("getLastMessageId={}", admin.topics().getLastMessageId("persistent://public/default/my-topic"));

        admin.topics().createNonPartitionedTopic("persistent://public/default/test-topic");
        admin.topics().delete("persistent://public/default/test-topic");
        log.info("getList={}", admin.topics().getList("public/default"));
        log.info("getStats={}", admin.topics().getStats("persistent://public/default/my-topic", false));
        log.info("getInternalStats={}", admin.topics().getInternalStats("persistent://public/default/my-topic"));

        admin.topics().createPartitionedTopic("persistent://public/default/test-topic-p", 2);
        log.info("getPartitionedTopicMetadata={}", admin.topics().getPartitionedTopicMetadata("persistent://public/default/test-topic-p"));
        admin.topics().updatePartitionedTopic("persistent://public/default/test-topic-p", 3);
        admin.topics().deletePartitionedTopic("persistent://public/default/test-topic-p");
        log.info("getStats={}", admin.topics().getPartitionedStats("persistent://public/default/my-topic2", false));
        log.info("getInternalStats={}", admin.topics().getPartitionedInternalStats("persistent://public/default/my-topic2"));

        admin.topics().createSubscription("persistent://public/default/my-topic", "test-subscription", MessageId.latest);
        log.info("getStats={}", admin.topics().getSubscriptions("persistent://public/default/my-topic"));
        admin.topics().deleteSubscription("persistent://public/default/my-topic", "test-subscription");
    }
}

AdminCase.java

參考：
https://pulsar.apache.org/docs/3.3.x/client-libraries-java/
https://pulsar.apache.org/docs/3.3.x/admin-api-overview/

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