Publier un message volumineux sur Amazon SNS avec Amazon S3 à l’aide d’un kit SDK AWS - Amazon Simple Notification Service

Publier un message volumineux sur Amazon SNS avec Amazon S3 à l’aide d’un kit SDK AWS

L’exemple de code suivant montre comment publier un message volumineux sur Amazon SNS à l’aide d’Amazon S3 pour stocker la charge utile du message.

Java
Kit SDK pour Java 1.x
Astuce

Pour découvrir comment configurer et exécuter cet exemple, consultez GitHub.

Pour publier un message volumineux, vous pouvez utiliser la bibliothèque client étendue Amazon SNS pour Java. Le message que vous envoyez fait référence à un objet Amazon S3 contenant le contenu réel du message.

import com.amazon.sqs.javamessaging.AmazonSQSExtendedClient; import com.amazon.sqs.javamessaging.ExtendedClientConfiguration; import com.amazonaws.regions.Region; import com.amazonaws.regions.Regions; import com.amazonaws.services.s3.AmazonS3; import com.amazonaws.services.s3.AmazonS3ClientBuilder; import com.amazonaws.services.sns.AmazonSNS; import com.amazonaws.services.sns.AmazonSNSClientBuilder; import com.amazonaws.services.sns.model.CreateTopicRequest; import com.amazonaws.services.sns.model.PublishRequest; import com.amazonaws.services.sns.model.SetSubscriptionAttributesRequest; import com.amazonaws.services.sns.util.Topics; import com.amazonaws.services.sqs.AmazonSQS; import com.amazonaws.services.sqs.AmazonSQSClientBuilder; import com.amazonaws.services.sqs.model.CreateQueueRequest; import com.amazonaws.services.sqs.model.ReceiveMessageResult; import software.amazon.sns.AmazonSNSExtendedClient; import software.amazon.sns.SNSExtendedClientConfiguration; public class Example { public static void main(String[] args) { final String BUCKET_NAME = "extended-client-bucket"; final String TOPIC_NAME = "extended-client-topic"; final String QUEUE_NAME = "extended-client-queue"; final Regions region = Regions.DEFAULT_REGION; //Message threshold controls the maximum message size that will be allowed to be published //through SNS using the extended client. Payload of messages exceeding this value will be stored in //S3. The default value of this parameter is 256 KB which is the maximum message size in SNS (and SQS). final int EXTENDED_STORAGE_MESSAGE_SIZE_THRESHOLD = 32; //Initialize SNS, SQS and S3 clients final AmazonSNS snsClient = AmazonSNSClientBuilder.standard().withRegion(region).build(); final AmazonSQS sqsClient = AmazonSQSClientBuilder.standard().withRegion(region).build(); final AmazonS3 s3Client = AmazonS3ClientBuilder.standard().withRegion(region).build(); //Create bucket, topic, queue and subscription s3Client.createBucket(BUCKET_NAME); final String topicArn = snsClient.createTopic( new CreateTopicRequest().withName(TOPIC_NAME) ).getTopicArn(); final String queueUrl = sqsClient.createQueue( new CreateQueueRequest().withQueueName(QUEUE_NAME) ).getQueueUrl(); final String subscriptionArn = Topics.subscribeQueue( snsClient, sqsClient, topicArn, queueUrl ); //To read message content stored in S3 transparently through SQS extended client, //set the RawMessageDelivery subscription attribute to TRUE final SetSubscriptionAttributesRequest subscriptionAttributesRequest = new SetSubscriptionAttributesRequest(); subscriptionAttributesRequest.setSubscriptionArn(subscriptionArn); subscriptionAttributesRequest.setAttributeName("RawMessageDelivery"); subscriptionAttributesRequest.setAttributeValue("TRUE"); snsClient.setSubscriptionAttributes(subscriptionAttributesRequest); //Initialize SNS extended client //PayloadSizeThreshold triggers message content storage in S3 when the threshold is exceeded //To store all messages content in S3, use AlwaysThroughS3 flag final SNSExtendedClientConfiguration snsExtendedClientConfiguration = new SNSExtendedClientConfiguration() .withPayloadSupportEnabled(s3Client, BUCKET_NAME) .withPayloadSizeThreshold(EXTENDED_STORAGE_MESSAGE_SIZE_THRESHOLD); final AmazonSNSExtendedClient snsExtendedClient = new AmazonSNSExtendedClient(snsClient, snsExtendedClientConfiguration); //Publish message via SNS with storage in S3 final String message = "This message is stored in S3 as it exceeds the threshold of 32 bytes set above."; snsExtendedClient.publish(topicArn, message); //Initialize SQS extended client final ExtendedClientConfiguration sqsExtendedClientConfiguration = new ExtendedClientConfiguration() .withPayloadSupportEnabled(s3Client, BUCKET_NAME); final AmazonSQSExtendedClient sqsExtendedClient = new AmazonSQSExtendedClient(sqsClient, sqsExtendedClientConfiguration); //Read the message from the queue final ReceiveMessageResult result = sqsExtendedClient.receiveMessage(queueUrl); System.out.println("Received message is " + result.getMessages().get(0).getBody()); } }

Pour obtenir la liste complète des guides de développementAWS SDK et des exemples de code, consultez Utilisation d'Amazon SNS avec un kit SDK AWS. Cette rubrique comprend également des informations sur le démarrage et sur les versions précédentes du kit de développement logiciel (SDK).