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docs: Update emulator sample to create a topic and publish to it #2039

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merged 3 commits into from
Oct 3, 2024
Merged

docs: Update emulator sample to create a topic and publish to it #2039

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cf75491
deps: Change scope of grpc-inprocess dependency from runtime to test
michaelpri10 May 20, 2024
b3572b3
docs: Update emulator sample to create a topic and publish to it
michaelpri10 May 20, 2024
8cf7b6c
docs: Small wording update to emulator sample
michaelpri10 Oct 3, 2024
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2 changes: 1 addition & 1 deletion google-cloud-pubsub/pom.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -85,7 +85,7 @@
<dependency>
<groupId>io.grpc</groupId>
<artifactId>grpc-inprocess</artifactId>
<scope>runtime</scope>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.errorprone</groupId>
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40 changes: 28 additions & 12 deletions samples/snippets/src/main/java/pubsub/UsePubSubEmulatorExample.java
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Expand Up @@ -16,6 +16,15 @@

package pubsub;

/**
* Snippet that demonstrates creating Pub/Sub clients using the Google Cloud Pub/Sub emulator.
*
* <p>Note: clients cannot start/stop the emulator.
*/

// [START pubsub_use_emulator]

import com.google.api.core.ApiFuture;
import com.google.api.gax.core.CredentialsProvider;
import com.google.api.gax.core.NoCredentialsProvider;
import com.google.api.gax.grpc.GrpcTransportChannel;
Expand All @@ -24,20 +33,16 @@
import com.google.cloud.pubsub.v1.Publisher;
import com.google.cloud.pubsub.v1.TopicAdminClient;
import com.google.cloud.pubsub.v1.TopicAdminSettings;
import com.google.protobuf.ByteString;
import com.google.pubsub.v1.PubsubMessage;
import com.google.pubsub.v1.Topic;
import com.google.pubsub.v1.TopicName;
import io.grpc.ManagedChannel;
import io.grpc.ManagedChannelBuilder;
import java.io.IOException;

/**
* Snippet that demonstrates creating Pub/Sub clients using the Google Cloud Pub/Sub emulator.
*
* <p>Note: clients cannot start/stop the emulator.
*/
public class UsePubSubEmulatorExample {

public static void main(String... args) throws IOException {
// [START pubsub_use_emulator]
public static void main(String... args) throws Exception {
String hostport = System.getenv("PUBSUB_EMULATOR_HOST");
ManagedChannel channel = ManagedChannelBuilder.forTarget(hostport).usePlaintext().build();
try {
Expand All @@ -46,25 +51,36 @@ public static void main(String... args) throws IOException {
CredentialsProvider credentialsProvider = NoCredentialsProvider.create();

// Set the channel and credentials provider when creating a `TopicAdminClient`.
// Similarly for SubscriptionAdminClient
TopicAdminClient topicClient =
// Can be done similarly for a `SubscriptionAdminClient`.
TopicAdminClient topicAdminClient =
TopicAdminClient.create(
TopicAdminSettings.newBuilder()
.setTransportChannelProvider(channelProvider)
.setCredentialsProvider(credentialsProvider)
.build());

TopicName topicName = TopicName.of("my-project-id", "my-topic-id");
Topic topic = topicAdminClient.createTopic(topicName);
System.out.println("Created topic: " + topic.getName());

// Set the channel and credentials provider when creating a `Publisher`.
// Similarly for Subscriber
// Can be done similarly for a `Subscriber`.
Publisher publisher =
Publisher.newBuilder(topicName)
.setChannelProvider(channelProvider)
.setCredentialsProvider(credentialsProvider)
.build();

String message = "Hello World!";
ByteString data = ByteString.copyFromUtf8(message);
PubsubMessage pubsubMessage = PubsubMessage.newBuilder().setData(data).build();

ApiFuture<String> messageIdFuture = publisher.publish(pubsubMessage);
String messageId = messageIdFuture.get();
System.out.println("Published message ID: " + messageId);
} finally {
channel.shutdown();
}
// [END pubsub_use_emulator]
}
}
// [END pubsub_use_emulator]
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