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docs(samples): Optimistic subscribe sample (#2063)
* docs(samples): Add code sample for optimistic subscribe * docs(samples): Fix formatting on test * docs(samples): Use an error listener instead of catching an exception for the OptimisticSubscribeExample * test: Add exception handler to OptimisticSubscribeExample * 🦉 Updates from OwlBot post-processor See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md --------- Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
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samples/snippets/src/main/java/pubsub/OptimisticSubscribeExample.java
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| /* | ||
| * Copyright 2024 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. | ||
| */ | ||
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| package pubsub; | ||
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| // [START pubsub_optimistic_subscribe] | ||
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| import com.google.api.gax.rpc.NotFoundException; | ||
| import com.google.cloud.pubsub.v1.AckReplyConsumer; | ||
| import com.google.cloud.pubsub.v1.MessageReceiver; | ||
| import com.google.cloud.pubsub.v1.Subscriber; | ||
| import com.google.cloud.pubsub.v1.SubscriptionAdminClient; | ||
| import com.google.common.util.concurrent.MoreExecutors; | ||
| import com.google.pubsub.v1.ProjectSubscriptionName; | ||
| import com.google.pubsub.v1.PubsubMessage; | ||
| import com.google.pubsub.v1.PushConfig; | ||
| import com.google.pubsub.v1.Subscription; | ||
| import com.google.pubsub.v1.TopicName; | ||
| import java.io.IOException; | ||
| import java.util.concurrent.TimeUnit; | ||
| import java.util.concurrent.TimeoutException; | ||
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| public class OptimisticSubscribeExample { | ||
| public static void main(String... args) throws Exception { | ||
| // TODO(developer): Replace these variables before running the sample. | ||
| String projectId = "your-project-id"; | ||
| String subscriptionId = "your-subscription-id"; | ||
| String topicId = "your-topic-id"; | ||
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| optimisticSubscribeExample(projectId, subscriptionId, topicId); | ||
| } | ||
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| public static void optimisticSubscribeExample( | ||
| String projectId, String subscriptionId, String topicId) throws IOException { | ||
| ProjectSubscriptionName subscriptionName = | ||
| ProjectSubscriptionName.of(projectId, subscriptionId); | ||
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| // Instantiate an asynchronous message receiver. | ||
| MessageReceiver receiver = | ||
| (PubsubMessage message, AckReplyConsumer consumer) -> { | ||
| // Handle incoming message, then ack the received message. | ||
| System.out.println("Id: " + message.getMessageId()); | ||
| System.out.println("Data: " + message.getData().toStringUtf8()); | ||
| consumer.ack(); | ||
| }; | ||
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| Subscriber subscriber = null; | ||
| try { | ||
| subscriber = Subscriber.newBuilder(subscriptionName, receiver).build(); | ||
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| // Listen for resource NOT_FOUND errors and rebuild the subscriber and restart subscribing | ||
| // when the current subscriber encounters these errors. | ||
| subscriber.addListener( | ||
| new Subscriber.Listener() { | ||
| public void failed(Subscriber.State from, Throwable failure) { | ||
| System.out.println(failure.getStackTrace()); | ||
| if (failure instanceof NotFoundException) { | ||
| try (SubscriptionAdminClient subscriptionAdminClient = | ||
| SubscriptionAdminClient.create()) { | ||
| TopicName topicName = TopicName.of(projectId, topicId); | ||
| // Create a pull subscription with default acknowledgement deadline of 10 seconds. | ||
| // The client library will automatically extend acknowledgement deadlines. | ||
| Subscription subscription = | ||
| subscriptionAdminClient.createSubscription( | ||
| subscriptionName, topicName, PushConfig.getDefaultInstance(), 10); | ||
| System.out.println("Created pull subscription: " + subscription.getName()); | ||
| optimisticSubscribeExample(projectId, subscriptionId, topicId); | ||
| } catch (IOException err) { | ||
| System.out.println("Failed to create pull subscription: " + err.getMessage()); | ||
| } | ||
| } | ||
| } | ||
| }, | ||
| MoreExecutors.directExecutor()); | ||
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| subscriber.startAsync().awaitRunning(); | ||
| System.out.printf("Listening for messages on %s:\n", subscriptionName.toString()); | ||
| subscriber.awaitTerminated(30, TimeUnit.SECONDS); | ||
| } catch (IllegalStateException e) { | ||
| // Prevent an exception from being thrown if it is the expected NotFoundException | ||
| if (!(subscriber.failureCause() instanceof NotFoundException)) { | ||
| throw e; | ||
| } | ||
| } catch (TimeoutException e) { | ||
| subscriber.stopAsync(); | ||
| } | ||
| } | ||
| } | ||
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| // [END pubsub_optimistic_subscribe] |
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