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Per la documentazione dettagliata che include questo esempio di codice, vedi quanto segue:
Esempio di codice
Go
import (
"context"
"fmt"
"io"
"cloud.google.com/go/pubsublite"
"google.golang.org/api/iterator"
)
func listSubscriptionsInTopic(w io.Writer, projectID, region, location, topicID string) error {
// projectID := "my-project-id"
// region := "us-central1"
// NOTE: location can be either a region ("us-central1") or a zone ("us-central1-a")
// For a list of valid locations, see https://cloud.google.com/pubsub/lite/docs/locations.
// location := "us-central"
// 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()
topicPath := fmt.Sprintf("projects/%s/locations/%s/topics/%s", projectID, location, topicID)
subPathIter := client.TopicSubscriptions(ctx, topicPath)
for {
subPath, err := subPathIter.Next()
if err == iterator.Done {
break
}
if err != nil {
return fmt.Errorf("subPathIter.Next got err: %v", err)
}
fmt.Fprintf(w, "Got subscription: %s\n", subPath)
}
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.CloudRegionOrZone;
import com.google.cloud.pubsublite.CloudZone;
import com.google.cloud.pubsublite.ProjectNumber;
import com.google.cloud.pubsublite.SubscriptionPath;
import com.google.cloud.pubsublite.TopicName;
import com.google.cloud.pubsublite.TopicPath;
import java.util.List;
public class ListSubscriptionsInTopicExample {
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';
long projectNumber = Long.parseLong("123456789");
String topicId = "your-topic-id";
// True if using a regional location. False if using a zonal location.
// https://cloud.google.com/pubsub/lite/docs/topics
boolean regional = false;
listSubscriptionsInTopicExample(cloudRegion, zoneId, projectNumber, topicId, regional);
}
public static void listSubscriptionsInTopicExample(
String cloudRegion, char zoneId, long projectNumber, String topicId, boolean regional)
throws Exception {
CloudRegionOrZone location;
if (regional) {
location = CloudRegionOrZone.of(CloudRegion.of(cloudRegion));
} else {
location = CloudRegionOrZone.of(CloudZone.of(CloudRegion.of(cloudRegion), zoneId));
}
TopicPath topicPath =
TopicPath.newBuilder()
.setProject(ProjectNumber.of(projectNumber))
.setLocation(location)
.setName(TopicName.of(topicId))
.build();
AdminClientSettings adminClientSettings =
AdminClientSettings.newBuilder().setRegion(CloudRegion.of(cloudRegion)).build();
try (AdminClient adminClient = AdminClient.create(adminClientSettings)) {
List<SubscriptionPath> subscriptionPaths =
adminClient.listTopicSubscriptions(topicPath).get();
for (SubscriptionPath subscription : subscriptionPaths) {
System.out.println(subscription.toString());
}
if (regional) {
System.out.println(
subscriptionPaths.size()
+ " subscription(s) listed in the regional topic "
+ topicPath);
} else {
System.out.println(
subscriptionPaths.size() + " subscription(s) listed in the zonal topic " + topicPath);
}
}
}
}Python
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"
# regional = True
if regional:
location = CloudRegion(cloud_region)
else:
location = CloudZone(CloudRegion(cloud_region), zone_id)
topic_path = TopicPath(project_number, location, topic_id)
client = AdminClient(cloud_region)
response = client.list_topic_subscriptions(topic_path)
for subscription_path in response:
print(subscription_path)
print(f"{len(response)} subscription(s) listed in your topic.")Passaggi successivi
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