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namespace pubsub = ::google::cloud::pubsub;
namespace pubsub_admin = ::google::cloud::pubsub_admin;
[](pubsub_admin::TopicAdminClient client, std::string const& project_id,
   std::string const& topic_id) {
  auto status =
      client.DeleteTopic(pubsub::Topic(project_id, topic_id).FullName());
  // Note that kNotFound is a possible result when the library retries.
  if (status.code() == google::cloud::StatusCode::kNotFound) {
    std::cout << "The topic was not found\n";
    return;
  }
  if (!status.ok()) throw std::runtime_error(status.message());

  std::cout << "The topic was successfully deleted\n";
}

using Google.Cloud.PubSub.V1;

public class DeleteTopicSample
{
    public void DeleteTopic(string projectId, string topicId)
    {
        PublisherServiceApiClient publisher = PublisherServiceApiClient.Create();
        TopicName topicName = TopicName.FromProjectTopic(projectId, topicId);
        publisher.DeleteTopic(topicName);
    }
}

import (
	"context"
	"fmt"
	"io"

	"cloud.google.com/go/pubsub/v2"
	"cloud.google.com/go/pubsub/v2/apiv1/pubsubpb"
)

func delete(w io.Writer, projectID, topicID string) error {
	// projectID := "my-project-id"
	// topicID := "my-topic"
	ctx := context.Background()
	client, err := pubsub.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("pubsub.NewClient: %w", err)
	}
	defer client.Close()

	req := &pubsubpb.DeleteTopicRequest{
		Topic: fmt.Sprintf("projects/%s/topics/%s", projectID, topicID),
	}
	err = client.TopicAdminClient.DeleteTopic(ctx, req)
	if err != nil {
		return fmt.Errorf("failed to delete topic: %w", err)
	}
	fmt.Fprintln(w, "Deleted topic")
	return nil
}

import com.google.api.gax.rpc.NotFoundException;
import com.google.cloud.pubsub.v1.TopicAdminClient;
import com.google.pubsub.v1.TopicName;
import java.io.IOException;

public class DeleteTopicExample {
  public static void main(String... args) throws Exception {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "your-project-id";
    String topicId = "your-topic-id";

    deleteTopicExample(projectId, topicId);
  }

  public static void deleteTopicExample(String projectId, String topicId) throws IOException {
    try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
      TopicName topicName = TopicName.of(projectId, topicId);
      try {
        topicAdminClient.deleteTopic(topicName);
        System.out.println("Deleted topic.");
      } catch (NotFoundException e) {
        System.out.println(e.getMessage());
      }
    }
  }
}

/**
 * TODO(developer): Uncomment this variable before running the sample.
 */
// const topicNameOrId = 'YOUR_TOPIC_NAME_OR_ID';

// Imports the Google Cloud client library
const {PubSub} = require('@google-cloud/pubsub');

// Creates a client; cache this for further use
const pubSubClient = new PubSub();

async function deleteTopic(topicNameOrId) {
  /**
   * TODO(developer): Uncomment the following line to run the sample.
   */
  // const topicName = 'my-topic';

  // Deletes the topic
  await pubSubClient.topic(topicNameOrId).delete();
  console.log(`Topic ${topicNameOrId} deleted.`);
}

/**
 * TODO(developer): Uncomment this variable before running the sample.
 */
// const topicNameOrId = 'YOUR_TOPIC_NAME_OR_ID';

// Imports the Google Cloud client library
import {PubSub} from '@google-cloud/pubsub';

// Creates a client; cache this for further use
const pubSubClient = new PubSub();

async function deleteTopic(topicNameOrId: string) {
  /**
   * TODO(developer): Uncomment the following line to run the sample.
   */
  // const topicName = 'my-topic';

  // Deletes the topic
  await pubSubClient.topic(topicNameOrId).delete();
  console.log(`Topic ${topicNameOrId} deleted.`);
}

use Google\Cloud\PubSub\PubSubClient;

/**
 * Creates a Pub/Sub topic.
 *
 * @param string $projectId  The Google project ID.
 * @param string $topicName  The Pub/Sub topic name.
 */
function delete_topic($projectId, $topicName)
{
    $pubsub = new PubSubClient([
        'projectId' => $projectId,
    ]);
    $topic = $pubsub->topic($topicName);
    $topic->delete();

    printf('Topic deleted: %s' . PHP_EOL, $topic->name());
}

from google.cloud import pubsub_v1

# TODO(developer)
# project_id = "your-project-id"
# topic_id = "your-topic-id"

publisher = pubsub_v1.PublisherClient()
topic_path = publisher.topic_path(project_id, topic_id)

publisher.delete_topic(request={"topic": topic_path})

print(f"Topic deleted: {topic_path}")

# topic_id = "your-topic-id"

pubsub = Google::Cloud::PubSub.new
topic_admin = pubsub.topic_admin

topic_admin.delete_topic topic: pubsub.topic_path(topic_id)

puts "Topic #{topic_id} deleted."