Publiez un message volumineux sur Amazon SNS avec Amazon S3 à l'aide d'un AWS SDK - Exemples de code de l'AWS SDK

D'autres AWS SDK exemples sont disponibles dans le GitHub dépôt AWS Doc SDK Examples.

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Publiez un message volumineux sur Amazon SNS avec Amazon S3 à l'aide d'un AWS SDK

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

Java
SDKpour Java 1.x
Note

Il y en a plus à ce sujet GitHub. Trouvez l’exemple complet et découvrez comment le configurer et l’exécuter dans le référentiel d’exemples de code AWS.

Pour publier un message volumineux, utilisez la bibliothèque client Amazon SNS Extended 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());
        }
}