Publish a large message to Amazon SNS with Amazon S3 using an Amazon SDK - Amazon Simple Notification Service
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Publish a large message to Amazon SNS with Amazon S3 using an Amazon SDK

The following code example shows how to publish a large message to Amazon SNS using Amazon S3 to store the message payload.

SDK for Java 1.x

There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository.

To publish a large message, use the Amazon SNS Extended Client Library for Java. The message that you send references an Amazon S3 object containing the actual message content.

import; import; import com.amazonaws.regions.Region; import com.amazonaws.regions.Regions; import; import; import; import; import; import; import; import; import; import; import; import; import; import; 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()); } }

For a complete list of Amazon SDK developer guides and code examples, see Using Amazon SNS with an Amazon SDK. This topic also includes information about getting started and details about previous SDK versions.