Create topic

  namespace 
  
 pubsub 
  
 = 
  
 :: 
 google 
 :: 
 cloud 
 :: 
 pubsub 
 ; 
 namespace 
  
 pubsub_admin 
  
 = 
  
 :: 
 google 
 :: 
 cloud 
 :: 
 pubsub_admin 
 ; 
 []( 
 pubsub_admin 
 :: 
 TopicAdminClient 
  
 client 
 , 
  
 std 
 :: 
 string 
  
 project_id 
 , 
  
 std 
 :: 
 string 
  
 topic_id 
 ) 
  
 { 
  
 auto 
  
 topic 
  
 = 
  
 client 
 . 
 CreateTopic 
 ( 
  
 pubsub 
 :: 
 Topic 
 ( 
 std 
 :: 
 move 
 ( 
 project_id 
 ), 
  
 std 
 :: 
 move 
 ( 
 topic_id 
 )). 
 FullName 
 ()); 
  
 // Note that kAlreadyExists is a possible error when the library retries. 
  
 if 
  
 ( 
 topic 
 . 
 status 
 (). 
 code 
 () 
  
 == 
  
 google 
 :: 
 cloud 
 :: 
 StatusCode 
 :: 
 kAlreadyExists 
 ) 
  
 { 
  
 std 
 :: 
 cout 
 << 
 "The topic already exists 
 \n 
 " 
 ; 
  
 return 
 ; 
  
 } 
  
 if 
  
 ( 
 ! 
 topic 
 ) 
  
 throw 
  
 std 
 :: 
 move 
 ( 
 topic 
 ). 
 status 
 (); 
  
 std 
 :: 
 cout 
 << 
 "The topic was successfully created: " 
 << 
 topic 
 - 
> DebugString 
 () 
 << 
 " 
 \n 
 " 
 ; 
 } 
 

  using 
  
  Google.Cloud.PubSub.V1 
 
 ; 
 using 
  
  Grpc.Core 
 
 ; 
 using 
  
 System 
 ; 
 public 
  
 class 
  
 CreateTopicSample 
 { 
  
 public 
  
 Topic 
  
 CreateTopic 
 ( 
 string 
  
 projectId 
 , 
  
 string 
  
 topicId 
 ) 
  
 { 
  
  PublisherServiceApiClient 
 
  
 publisher 
  
 = 
  
  PublisherServiceApiClient 
 
 . 
  Create 
 
 (); 
  
 var 
  
 topicName 
  
 = 
  
  TopicName 
 
 . 
  FromProjectTopic 
 
 ( 
 projectId 
 , 
  
 topicId 
 ); 
  
  Topic 
 
  
 topic 
  
 = 
  
 null 
 ; 
  
 try 
  
 { 
  
 topic 
  
 = 
  
 publisher 
 . 
  CreateTopic 
 
 ( 
 topicName 
 ); 
  
 Console 
 . 
 WriteLine 
 ( 
 $"Topic {topic. Name 
} created." 
 ); 
  
 } 
  
 catch 
  
 ( 
  RpcException 
 
  
 e 
 ) 
  
 when 
  
 ( 
 e 
 . 
  Status 
 
 . 
  StatusCode 
 
  
 == 
  
  StatusCode 
 
 . 
  AlreadyExists 
 
 ) 
  
 { 
  
 Console 
 . 
 WriteLine 
 ( 
 $"Topic {topicName} already exists." 
 ); 
  
 } 
  
 return 
  
 topic 
 ; 
  
 } 
 } 
 

  import 
  
 ( 
  
 "context" 
  
 "fmt" 
  
 "io" 
  
 "cloud.google.com/go/pubsub/v2" 
  
 "cloud.google.com/go/pubsub/v2/apiv1/pubsubpb" 
 ) 
 func 
  
 create 
 ( 
 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 
 () 
  
 topic 
  
 := 
  
& pubsubpb 
 . 
 Topic 
 { 
  
 Name 
 : 
  
 fmt 
 . 
 Sprintf 
 ( 
 "projects/%s/topics/%s" 
 , 
  
 projectID 
 , 
  
 topicID 
 ), 
  
 } 
  
 t 
 , 
  
 err 
  
 := 
  
 client 
 . 
 TopicAdminClient 
 . 
 CreateTopic 
 ( 
 ctx 
 , 
  
 topic 
 ) 
  
 if 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 return 
  
 fmt 
 . 
 Errorf 
 ( 
 "CreateTopic: %w" 
 , 
  
 err 
 ) 
  
 } 
  
 fmt 
 . 
 Fprintf 
 ( 
 w 
 , 
  
 "Topic created: %v\n" 
 , 
  
 t 
 ) 
  
 return 
  
 nil 
 } 
 

  import 
  
 com.google.cloud.pubsub.v1. TopicAdminClient 
 
 ; 
 import 
  
 com.google.pubsub.v1. Topic 
 
 ; 
 import 
  
 com.google.pubsub.v1. TopicName 
 
 ; 
 import 
  
 java.io.IOException 
 ; 
 public 
  
 class 
 CreateTopicExample 
  
 { 
  
 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" 
 ; 
  
 createTopicExample 
 ( 
 projectId 
 , 
  
 topicId 
 ); 
  
 } 
  
 public 
  
 static 
  
 void 
  
 createTopicExample 
 ( 
 String 
  
 projectId 
 , 
  
 String 
  
 topicId 
 ) 
  
 throws 
  
 IOException 
  
 { 
  
 try 
  
 ( 
  TopicAdminClient 
 
  
 topicAdminClient 
  
 = 
  
  TopicAdminClient 
 
 . 
 create 
 ()) 
  
 { 
  
  TopicName 
 
  
 topicName 
  
 = 
  
  TopicName 
 
 . 
 of 
 ( 
 projectId 
 , 
  
 topicId 
 ); 
  
  Topic 
 
  
 topic 
  
 = 
  
 topicAdminClient 
 . 
 createTopic 
 ( 
 topicName 
 ); 
  
 System 
 . 
 out 
 . 
 println 
 ( 
 "Created topic: " 
  
 + 
  
 topic 
 . 
  getName 
 
 ()); 
  
 } 
  
 } 
 } 
 

   
 } 
 ] 
 exports 
 [ 
 'sample transformation correctly transforms TS 1' 
 ] 
  
 = 
  
 ` 
 // Copyright 2026 Google LLC 
 // 
 // Licensed under the Apache License, Version 2.0 (the "License"); 
 // you may not use this file except in compliance with the License. 
 // You may obtain a copy of the License at 
 // 
 //      http://www.apache.org/licenses/LICENSE-2.0 
 // 
 // Unless required by applicable law or agreed to in writing, software 
 // distributed under the License is distributed on an "AS IS" BASIS, 
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 // See the License for the specific language governing permissions and 
 // limitations under the License. 
 // This is a generated sample, using the typeless sample bot. Please 
 // look for the source TypeScript sample (.ts) for modifications. 
 'use strict'; 
 /** 
 * This application demonstrates how to perform basic operations on 
 * schemas with the Google Cloud Pub/Sub API. 
 * 
 * For more information, see the README.md under /pubsub and the documentation 
 * at https://cloud.google.com/pubsub/docs. 
 */ 
 // sample-metadata: 
 //   title: List schemas on a project 
 //   description: Gets a list of schemas which were previously created in the project. 
 //   usage: node listSchemas.js 
 // 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 listSchemas() { 
 for await (const s of pubSubClient.listSchemas()) { 
 console.log(s.name); 
 } 
 console.log('Listed schemas.'); 
 } 
 function main() { 
 listSchemas().catch((err) => { 
 console.error(err.message); 
 process.exitCode = 1; 
 }); 
 } 
 main(); 
 ` 
 exports 
 [ 
 'command line option "targets" works with a single sample file 1' 
 ] 
  
 = 
  
 ` 
 // Copyright 2026 Google LLC 
 // 
 // Licensed under the Apache License, Version 2.0 (the "License"); 
 // you may not use this file except in compliance with the License. 
 // You may obtain a copy of the License at 
 // 
 //      http://www.apache.org/licenses/LICENSE-2.0 
 // 
 // Unless required by applicable law or agreed to in writing, software 
 // distributed under the License is distributed on an "AS IS" BASIS, 
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 // See the License for the specific language governing permissions and 
 // limitations under the License. 
 // This is a generated sample, using the typeless sample bot. Please 
 // look for the source TypeScript sample (.ts) for modifications. 
 'use strict'; 
 /** 
 * This application demonstrates how to perform basic operations on 
 * schemas with the Google Cloud Pub/Sub API. 
 * 
 * For more information, see the README.md under /pubsub and the documentation 
 * at https://cloud.google.com/pubsub/docs. 
 */ 
 // sample-metadata: 
 //   title: List schemas on a project 
 //   description: Gets a list of schemas which were previously created in the project. 
 //   usage: node listSchemas.js 
 // 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 listSchemas() { 
 for await (const s of pubSubClient.listSchemas()) { 
 console.log(s.name); 
 } 
 console.log('Listed schemas.'); 
 } 
 function main() { 
 listSchemas().catch((err) => { 
 console.error(err.message); 
 process.exitCode = 1; 
 }); 
 } 
 main(); 
 ` 
 exports 
 [ 
 'command line option "targets" works with multiple sample files 1' 
 ] 
  
 = 
  
 [ 
 ] 
 exports 
 [ 
 'command line option "outputpath" causes the output to move 1' 
 ] 
  
 = 
  
 [ 
 ] 
 exports 
 [ 
 'command line option "recursive" causes recursion and only matches samples 1' 
 ] 
  
 = 
  
 [ 
 ] 
 

  use Google\Cloud\PubSub\PubSubClient; 
 /** 
 * Creates a Pub/Sub topic. 
 * 
 * @param string $projectId  The Google project ID. 
 * @param string $topicName  The Pub/Sub topic name. 
 */ 
 function create_topic($projectId, $topicName) 
 { 
 $pubsub = new PubSubClient([ 
 'projectId' => $projectId, 
 ]); 
 $topic = $pubsub->createTopic($topicName); 
 printf('Topic created: %s' . PHP_EOL, $topic->name()); 
 } 
 

  # topic_id = "your-topic-id" 
 pubsub 
  
 = 
  
 Google 
 :: 
 Cloud 
 :: 
  PubSub 
 
 . 
  new 
 
 topic_admin 
  
 = 
  
 pubsub 
 . 
  topic_admin 
 
 topic 
  
 = 
  
 topic_admin 
 . 
 create_topic 
  
 name 
 : 
  
 pubsub 
 . 
 topic_path 
 ( 
 topic_id 
 ) 
 puts 
  
 "Topic 
 #{ 
 topic 
 . 
 name 
 } 
 created."