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:
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
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
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