获取精简版主题

输出精简版主题的名称、保留配置和分区配置。

包含此代码示例的文档页面

如需查看上下文中使用的代码示例，请参阅以下文档：

创建和管理精简版主题

代码示例

Go

import (
	"context"
	"fmt"
	"io"

	"cloud.google.com/go/pubsublite"
)

func getTopic(w io.Writer, projectID, region, zone, topicID string) error {
	// projectID := "my-project-id"
	// region := "us-central1"
	// zone := "us-central1-a"
	// topicID := "my-topic"
	ctx := context.Background()
	client, err := pubsublite.NewAdminClient(ctx, region)
	if err != nil {
		return fmt.Errorf("pubsublite.NewAdminClient: %v", err)
	}
	defer client.Close()

	topicName := fmt.Sprintf("projects/%s/locations/%s/topics/%s", projectID, zone, topicID)
	topic, err := client.Topic(ctx, topicName)
	if err != nil {
		return fmt.Errorf("client.Topic got err: %v", err)
	}
	fmt.Fprintf(w, "Got topic: %#v\n", *topic)
	return nil
}

Java

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import com.google.cloud.pubsublite.AdminClient;
import com.google.cloud.pubsublite.AdminClientSettings;
import com.google.cloud.pubsublite.CloudRegion;
import com.google.cloud.pubsublite.CloudZone;
import com.google.cloud.pubsublite.ProjectNumber;
import com.google.cloud.pubsublite.TopicName;
import com.google.cloud.pubsublite.TopicPath;
import com.google.cloud.pubsublite.proto.Topic;

public class GetTopicExample {

  public static void main(String... args) throws Exception {
    // TODO(developer): Replace these variables before running the sample.
    String cloudRegion = "your-cloud-region";
    char zoneId = 'b';
    // Choose an existing topic.
    String topicId = "your-topic-id";
    long projectNumber = Long.parseLong("123456789");

    getTopicExample(cloudRegion, zoneId, projectNumber, topicId);
  }

  public static void getTopicExample(
      String cloudRegion, char zoneId, long projectNumber, String topicId) throws Exception {
    TopicPath topicPath =
        TopicPath.newBuilder()
            .setProject(ProjectNumber.of(projectNumber))
            .setLocation(CloudZone.of(CloudRegion.of(cloudRegion), zoneId))
            .setName(TopicName.of(topicId))
            .build();

    AdminClientSettings adminClientSettings =
        AdminClientSettings.newBuilder().setRegion(CloudRegion.of(cloudRegion)).build();

    try (AdminClient adminClient = AdminClient.create(adminClientSettings)) {
      Topic topic = adminClient.getTopic(topicPath).get();
      long numPartitions = adminClient.getTopicPartitionCount(topicPath).get();
      System.out.println(topic.getAllFields() + "\nhas " + numPartitions + " partition(s).");
    }
  }
}

Python

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from google.api_core.exceptions import NotFound
from google.cloud.pubsublite import AdminClient
from google.cloud.pubsublite.types import CloudRegion, CloudZone, TopicPath

# TODO(developer):
# project_number = 1122334455
# cloud_region = "us-central1"
# zone_id = "a"
# topic_id = "your-topic-id"

cloud_region = CloudRegion(cloud_region)
location = CloudZone(cloud_region, zone_id)
topic_path = TopicPath(project_number, location, topic_id)

client = AdminClient(cloud_region)
try:
    response = client.get_topic(topic_path)
    num_partitions = client.get_topic_partition_count(topic_path)
    print(f"{response.name} has {num_partitions} partition(s).")
except NotFound:
    print(f"{topic_path} not found.")

后续步骤

如需搜索和过滤其他 Google Cloud 产品的代码示例，请参阅 Google Cloud 示例浏览器