SQSExemplos da Amazon usando SDK para Java 2.x - AWS SDKExemplos de código

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SQSExemplos da Amazon usando SDK para Java 2.x

Os exemplos de código a seguir mostram como realizar ações e implementar cenários comuns usando o AWS SDK for Java 2.x com a AmazonSQS.

Ações são trechos de código de programas maiores e devem ser executadas em contexto. Embora as ações mostrem como chamar funções de serviço individuais, é possível ver as ações no contexto em seus cenários relacionados.

Os cenários são exemplos de código que mostram como realizar tarefas específicas chamando várias funções dentro de um serviço ou combinadas com outros Serviços da AWS.

Cada exemplo inclui um link para o código-fonte completo, onde você pode encontrar instruções sobre como configurar e executar o código no contexto.

Conceitos básicos

Os exemplos de código a seguir mostram como começar a usar a AmazonSQS.

SDKpara Java 2.x
nota

Tem mais sobre GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS.

import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.sqs.SqsClient; import software.amazon.awssdk.services.sqs.model.SqsException; import software.amazon.awssdk.services.sqs.paginators.ListQueuesIterable; /** * Before running this Java V2 code example, set up your development * environment, including your credentials. * * For more information, see the following documentation topic: * * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html */ public class HelloSQS { public static void main(String[] args) { SqsClient sqsClient = SqsClient.builder() .region(Region.US_WEST_2) .build(); listQueues(sqsClient); sqsClient.close(); } public static void listQueues(SqsClient sqsClient) { try { ListQueuesIterable listQueues = sqsClient.listQueuesPaginator(); listQueues.stream() .flatMap(r -> r.queueUrls().stream()) .forEach(content -> System.out.println(" Queue URL: " + content.toLowerCase())); } catch (SqsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } }
  • Para API obter detalhes, consulte ListQueuesem AWS SDK for Java 2.x APIReferência.

Ações

O código de exemplo a seguir mostra como usar CreateQueue.

SDKpara Java 2.x
nota

Tem mais sobre GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS.

import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.sqs.SqsClient; import software.amazon.awssdk.services.sqs.model.ChangeMessageVisibilityRequest; import software.amazon.awssdk.services.sqs.model.CreateQueueRequest; import software.amazon.awssdk.services.sqs.model.DeleteMessageRequest; import software.amazon.awssdk.services.sqs.model.GetQueueUrlRequest; import software.amazon.awssdk.services.sqs.model.GetQueueUrlResponse; import software.amazon.awssdk.services.sqs.model.ListQueuesRequest; import software.amazon.awssdk.services.sqs.model.ListQueuesResponse; import software.amazon.awssdk.services.sqs.model.Message; import software.amazon.awssdk.services.sqs.model.ReceiveMessageRequest; import software.amazon.awssdk.services.sqs.model.SendMessageBatchRequest; import software.amazon.awssdk.services.sqs.model.SendMessageBatchRequestEntry; import software.amazon.awssdk.services.sqs.model.SendMessageRequest; import software.amazon.awssdk.services.sqs.model.SqsException; import java.util.List; /** * Before running this Java V2 code example, set up your development * environment, including your credentials. * * For more information, see the following documentation topic: * * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html */ public class SQSExample { public static void main(String[] args) { String queueName = "queue" + System.currentTimeMillis(); SqsClient sqsClient = SqsClient.builder() .region(Region.US_WEST_2) .build(); // Perform various tasks on the Amazon SQS queue. String queueUrl = createQueue(sqsClient, queueName); listQueues(sqsClient); listQueuesFilter(sqsClient, queueUrl); List<Message> messages = receiveMessages(sqsClient, queueUrl); sendBatchMessages(sqsClient, queueUrl); changeMessages(sqsClient, queueUrl, messages); deleteMessages(sqsClient, queueUrl, messages); sqsClient.close(); } public static String createQueue(SqsClient sqsClient, String queueName) { try { System.out.println("\nCreate Queue"); CreateQueueRequest createQueueRequest = CreateQueueRequest.builder() .queueName(queueName) .build(); sqsClient.createQueue(createQueueRequest); System.out.println("\nGet queue url"); GetQueueUrlResponse getQueueUrlResponse = sqsClient .getQueueUrl(GetQueueUrlRequest.builder().queueName(queueName).build()); return getQueueUrlResponse.queueUrl(); } catch (SqsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } return ""; } public static void listQueues(SqsClient sqsClient) { System.out.println("\nList Queues"); String prefix = "que"; try { ListQueuesRequest listQueuesRequest = ListQueuesRequest.builder().queueNamePrefix(prefix).build(); ListQueuesResponse listQueuesResponse = sqsClient.listQueues(listQueuesRequest); for (String url : listQueuesResponse.queueUrls()) { System.out.println(url); } } catch (SqsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static void listQueuesFilter(SqsClient sqsClient, String queueUrl) { // List queues with filters String namePrefix = "queue"; ListQueuesRequest filterListRequest = ListQueuesRequest.builder() .queueNamePrefix(namePrefix) .build(); ListQueuesResponse listQueuesFilteredResponse = sqsClient.listQueues(filterListRequest); System.out.println("Queue URLs with prefix: " + namePrefix); for (String url : listQueuesFilteredResponse.queueUrls()) { System.out.println(url); } System.out.println("\nSend message"); try { sqsClient.sendMessage(SendMessageRequest.builder() .queueUrl(queueUrl) .messageBody("Hello world!") .delaySeconds(10) .build()); } catch (SqsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static void sendBatchMessages(SqsClient sqsClient, String queueUrl) { System.out.println("\nSend multiple messages"); try { SendMessageBatchRequest sendMessageBatchRequest = SendMessageBatchRequest.builder() .queueUrl(queueUrl) .entries(SendMessageBatchRequestEntry.builder().id("id1").messageBody("Hello from msg 1").build(), SendMessageBatchRequestEntry.builder().id("id2").messageBody("msg 2").delaySeconds(10) .build()) .build(); sqsClient.sendMessageBatch(sendMessageBatchRequest); } catch (SqsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static List<Message> receiveMessages(SqsClient sqsClient, String queueUrl) { System.out.println("\nReceive messages"); try { ReceiveMessageRequest receiveMessageRequest = ReceiveMessageRequest.builder() .queueUrl(queueUrl) .maxNumberOfMessages(5) .build(); return sqsClient.receiveMessage(receiveMessageRequest).messages(); } catch (SqsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } return null; } public static void changeMessages(SqsClient sqsClient, String queueUrl, List<Message> messages) { System.out.println("\nChange Message Visibility"); try { for (Message message : messages) { ChangeMessageVisibilityRequest req = ChangeMessageVisibilityRequest.builder() .queueUrl(queueUrl) .receiptHandle(message.receiptHandle()) .visibilityTimeout(100) .build(); sqsClient.changeMessageVisibility(req); } } catch (SqsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static void deleteMessages(SqsClient sqsClient, String queueUrl, List<Message> messages) { System.out.println("\nDelete Messages"); try { for (Message message : messages) { DeleteMessageRequest deleteMessageRequest = DeleteMessageRequest.builder() .queueUrl(queueUrl) .receiptHandle(message.receiptHandle()) .build(); sqsClient.deleteMessage(deleteMessageRequest); } } catch (SqsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } }
  • Para API obter detalhes, consulte CreateQueueem AWS SDK for Java 2.x APIReferência.

O código de exemplo a seguir mostra como usar DeleteMessage.

SDKpara Java 2.x
nota

Tem mais sobre GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS.

try { for (Message message : messages) { DeleteMessageRequest deleteMessageRequest = DeleteMessageRequest.builder() .queueUrl(queueUrl) .receiptHandle(message.receiptHandle()) .build(); sqsClient.deleteMessage(deleteMessageRequest); } } catch (SqsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); }
  • Para API obter detalhes, consulte DeleteMessageem AWS SDK for Java 2.x APIReferência.

O código de exemplo a seguir mostra como usar DeleteQueue.

SDKpara Java 2.x
nota

Tem mais sobre GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS.

import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.sqs.SqsClient; import software.amazon.awssdk.services.sqs.model.GetQueueUrlRequest; import software.amazon.awssdk.services.sqs.model.DeleteQueueRequest; import software.amazon.awssdk.services.sqs.model.SqsException; /** * Before running this Java V2 code example, set up your development * environment, including your credentials. * * For more information, see the following documentation topic: * * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html */ public class DeleteQueue { public static void main(String[] args) { final String usage = """ Usage: <queueName> Where: queueName - The name of the Amazon SQS queue to delete. """; if (args.length != 1) { System.out.println(usage); System.exit(1); } String queueName = args[0]; SqsClient sqs = SqsClient.builder() .region(Region.US_WEST_2) .build(); deleteSQSQueue(sqs, queueName); sqs.close(); } public static void deleteSQSQueue(SqsClient sqsClient, String queueName) { try { GetQueueUrlRequest getQueueRequest = GetQueueUrlRequest.builder() .queueName(queueName) .build(); String queueUrl = sqsClient.getQueueUrl(getQueueRequest).queueUrl(); DeleteQueueRequest deleteQueueRequest = DeleteQueueRequest.builder() .queueUrl(queueUrl) .build(); sqsClient.deleteQueue(deleteQueueRequest); } catch (SqsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } }
  • Para API obter detalhes, consulte DeleteQueueem AWS SDK for Java 2.x APIReferência.

O código de exemplo a seguir mostra como usar GetQueueUrl.

SDKpara Java 2.x
nota

Tem mais sobre GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS.

GetQueueUrlResponse getQueueUrlResponse = sqsClient .getQueueUrl(GetQueueUrlRequest.builder().queueName(queueName).build()); return getQueueUrlResponse.queueUrl();
  • Para API obter detalhes, consulte GetQueueUrlem AWS SDK for Java 2.x APIReferência.

O código de exemplo a seguir mostra como usar ListQueues.

SDKpara Java 2.x
nota

Tem mais sobre GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS.

String prefix = "que"; try { ListQueuesRequest listQueuesRequest = ListQueuesRequest.builder().queueNamePrefix(prefix).build(); ListQueuesResponse listQueuesResponse = sqsClient.listQueues(listQueuesRequest); for (String url : listQueuesResponse.queueUrls()) { System.out.println(url); } } catch (SqsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); }
  • Para API obter detalhes, consulte ListQueuesem AWS SDK for Java 2.x APIReferência.

O código de exemplo a seguir mostra como usar ReceiveMessage.

SDKpara Java 2.x
nota

Tem mais sobre GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS.

try { ReceiveMessageRequest receiveMessageRequest = ReceiveMessageRequest.builder() .queueUrl(queueUrl) .maxNumberOfMessages(5) .build(); return sqsClient.receiveMessage(receiveMessageRequest).messages(); } catch (SqsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } return null;
  • Para API obter detalhes, consulte ReceiveMessageem AWS SDK for Java 2.x APIReferência.

O código de exemplo a seguir mostra como usar SendMessage.

SDKpara Java 2.x
nota

Tem mais sobre GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS.

import software.amazon.awssdk.auth.credentials.ProfileCredentialsProvider; import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.sqs.SqsClient; import software.amazon.awssdk.services.sqs.model.CreateQueueRequest; import software.amazon.awssdk.services.sqs.model.GetQueueUrlRequest; import software.amazon.awssdk.services.sqs.model.SendMessageRequest; import software.amazon.awssdk.services.sqs.model.SqsException; /** * Before running this Java V2 code example, set up your development * environment, including your credentials. * * For more information, see the following documentation topic: * * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html */ public class SendMessages { public static void main(String[] args) { final String usage = """ Usage: <queueName> <message> Where: queueName - The name of the queue. message - The message to send. """; if (args.length != 2) { System.out.println(usage); System.exit(1); } String queueName = args[0]; String message = args[1]; SqsClient sqsClient = SqsClient.builder() .region(Region.US_WEST_2) .build(); sendMessage(sqsClient, queueName, message); sqsClient.close(); } public static void sendMessage(SqsClient sqsClient, String queueName, String message) { try { CreateQueueRequest request = CreateQueueRequest.builder() .queueName(queueName) .build(); sqsClient.createQueue(request); GetQueueUrlRequest getQueueRequest = GetQueueUrlRequest.builder() .queueName(queueName) .build(); String queueUrl = sqsClient.getQueueUrl(getQueueRequest).queueUrl(); SendMessageRequest sendMsgRequest = SendMessageRequest.builder() .queueUrl(queueUrl) .messageBody(message) .delaySeconds(5) .build(); sqsClient.sendMessage(sendMsgRequest); } catch (SqsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } }
  • Para API obter detalhes, consulte SendMessageem AWS SDK for Java 2.x APIReferência.

O código de exemplo a seguir mostra como usar SendMessageBatch.

SDKpara Java 2.x
nota

Tem mais sobre GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS.

SendMessageBatchRequest sendMessageBatchRequest = SendMessageBatchRequest.builder() .queueUrl(queueUrl) .entries(SendMessageBatchRequestEntry.builder().id("id1").messageBody("Hello from msg 1").build(), SendMessageBatchRequestEntry.builder().id("id2").messageBody("msg 2").delaySeconds(10) .build()) .build(); sqsClient.sendMessageBatch(sendMessageBatchRequest);
  • Para API obter detalhes, consulte SendMessageBatchem AWS SDK for Java 2.x APIReferência.

Cenários

O exemplo de código a seguir mostra como criar um aplicativo de mensagens usando a AmazonSQS.

SDKpara Java 2.x

Mostra como usar a Amazon SQS API para desenvolver um Spring REST API que envia e recupera mensagens.

Para obter o código-fonte completo e instruções sobre como configurar e executar, veja o exemplo completo em GitHub.

Serviços utilizados neste exemplo
  • Amazon Comprehend

  • Amazon SQS

O exemplo de código a seguir mostra como criar e publicar em um SNS tópico FIFO da Amazon.

SDKpara Java 2.x
nota

Tem mais sobre GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS.

Esse exemplo

  • cria um SNS FIFO tópico da Amazon, duas SQS FIFO filas da Amazon e uma fila padrão.

  • inscreve as filas no tópico e publica a mensagem no tópico.

O teste verifica o recebimento da mensagem em cada fila. O exemplo completo também mostra a adição de políticas de acesso e exclui os recursos no final.

public class PriceUpdateExample { public final static SnsClient snsClient = SnsClient.create(); public final static SqsClient sqsClient = SqsClient.create(); public static void main(String[] args) { final String usage = "\n" + "Usage: " + " <topicName> <wholesaleQueueFifoName> <retailQueueFifoName> <analyticsQueueName>\n\n" + "Where:\n" + " fifoTopicName - The name of the FIFO topic that you want to create. \n\n" + " wholesaleQueueARN - The name of a SQS FIFO queue that will be created for the wholesale consumer. \n\n" + " retailQueueARN - The name of a SQS FIFO queue that will created for the retail consumer. \n\n" + " analyticsQueueARN - The name of a SQS standard queue that will be created for the analytics consumer. \n\n"; if (args.length != 4) { System.out.println(usage); System.exit(1); } final String fifoTopicName = args[0]; final String wholeSaleQueueName = args[1]; final String retailQueueName = args[2]; final String analyticsQueueName = args[3]; // For convenience, the QueueData class holds metadata about a queue: ARN, URL, // name and type. List<QueueData> queues = List.of( new QueueData(wholeSaleQueueName, QueueType.FIFO), new QueueData(retailQueueName, QueueType.FIFO), new QueueData(analyticsQueueName, QueueType.Standard)); // Create queues. createQueues(queues); // Create a topic. String topicARN = createFIFOTopic(fifoTopicName); // Subscribe each queue to the topic. subscribeQueues(queues, topicARN); // Allow the newly created topic to send messages to the queues. addAccessPolicyToQueuesFINAL(queues, topicARN); // Publish a sample price update message with payload. publishPriceUpdate(topicARN, "{\"product\": 214, \"price\": 79.99}", "Consumables"); // Clean up resources. deleteSubscriptions(queues); deleteQueues(queues); deleteTopic(topicARN); } public static String createFIFOTopic(String topicName) { try { // Create a FIFO topic by using the SNS service client. Map<String, String> topicAttributes = Map.of( "FifoTopic", "true", "ContentBasedDeduplication", "false"); CreateTopicRequest topicRequest = CreateTopicRequest.builder() .name(topicName) .attributes(topicAttributes) .build(); CreateTopicResponse response = snsClient.createTopic(topicRequest); String topicArn = response.topicArn(); System.out.println("The topic ARN is" + topicArn); return topicArn; } catch (SnsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } return ""; } public static void subscribeQueues(List<QueueData> queues, String topicARN) { queues.forEach(queue -> { SubscribeRequest subscribeRequest = SubscribeRequest.builder() .topicArn(topicARN) .endpoint(queue.queueARN) .protocol("sqs") .build(); // Subscribe to the endpoint by using the SNS service client. // Only Amazon SQS queues can receive notifications from an Amazon SNS FIFO // topic. SubscribeResponse subscribeResponse = snsClient.subscribe(subscribeRequest); System.out.println("The queue [" + queue.queueARN + "] subscribed to the topic [" + topicARN + "]"); queue.subscriptionARN = subscribeResponse.subscriptionArn(); }); } public static void publishPriceUpdate(String topicArn, String payload, String groupId) { try { // Create and publish a message that updates the wholesale price. String subject = "Price Update"; String dedupId = UUID.randomUUID().toString(); String attributeName = "business"; String attributeValue = "wholesale"; MessageAttributeValue msgAttValue = MessageAttributeValue.builder() .dataType("String") .stringValue(attributeValue) .build(); Map<String, MessageAttributeValue> attributes = new HashMap<>(); attributes.put(attributeName, msgAttValue); PublishRequest pubRequest = PublishRequest.builder() .topicArn(topicArn) .subject(subject) .message(payload) .messageGroupId(groupId) .messageDeduplicationId(dedupId) .messageAttributes(attributes) .build(); final PublishResponse response = snsClient.publish(pubRequest); System.out.println(response.messageId()); System.out.println(response.sequenceNumber()); System.out.println("Message was published to " + topicArn); } catch (SnsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } }

O exemplo de código a seguir mostra como trabalhar com notificações de eventos do S3 de uma forma orientada a objetos.

SDKpara Java 2.x
nota

Tem mais sobre GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS.

Este exemplo mostra como processar o evento de notificação do S3 usando a AmazonSQS.

/** * This method receives S3 event notifications by using an SqsAsyncClient. * After the client receives the messages it deserializes the JSON payload and logs them. It uses * the S3EventNotification class (part of the S3 event notification API for Java) to deserialize * the JSON payload and access the messages in an object-oriented way. * * @param queueUrl The URL of the AWS SQS queue that receives the S3 event notifications. * @see <a href="https://sdk.amazonaws.com/java/api/latest/software/amazon/awssdk/eventnotifications/s3/model/package-summary.html">S3EventNotification API</a>. * <p> * To use S3 event notification serialization/deserialization to objects, add the following * dependency to your Maven pom.xml file. * <dependency> * <groupId>software.amazon.awssdk</groupId> * <artifactId>s3-event-notifications</artifactId> * <version><LATEST></version> * </dependency> * <p> * The S3 event notification API became available with version 2.25.11 of the Java SDK. * <p> * This example shows the use of the API with AWS SQS, but it can be used to process S3 event notifications * in AWS SNS or AWS Lambda as well. * <p> * Note: The S3EventNotification class does not work with messages routed through AWS EventBridge. */ static void processS3Events(String bucketName, String queueUrl, String queueArn) { try { // Configure the bucket to send Object Created and Object Tagging notifications to an existing SQS queue. s3Client.putBucketNotificationConfiguration(b -> b .notificationConfiguration(ncb -> ncb .queueConfigurations(qcb -> qcb .events(Event.S3_OBJECT_CREATED, Event.S3_OBJECT_TAGGING) .queueArn(queueArn))) .bucket(bucketName) ).join(); triggerS3EventNotifications(bucketName); // Wait for event notifications to propagate. Thread.sleep(Duration.ofSeconds(5).toMillis()); boolean didReceiveMessages = true; while (didReceiveMessages) { // Display the number of messages that are available in the queue. sqsClient.getQueueAttributes(b -> b .queueUrl(queueUrl) .attributeNames(QueueAttributeName.APPROXIMATE_NUMBER_OF_MESSAGES) ).thenAccept(attributeResponse -> logger.info("Approximate number of messages in the queue: {}", attributeResponse.attributes().get(QueueAttributeName.APPROXIMATE_NUMBER_OF_MESSAGES))) .join(); // Receive the messages. ReceiveMessageResponse response = sqsClient.receiveMessage(b -> b .queueUrl(queueUrl) ).get(); logger.info("Count of received messages: {}", response.messages().size()); didReceiveMessages = !response.messages().isEmpty(); // Create a collection to hold the received message for deletion // after we log the messages. HashSet<DeleteMessageBatchRequestEntry> messagesToDelete = new HashSet<>(); // Process each message. response.messages().forEach(message -> { logger.info("Message id: {}", message.messageId()); // Deserialize JSON message body to a S3EventNotification object // to access messages in an object-oriented way. S3EventNotification event = S3EventNotification.fromJson(message.body()); // Log the S3 event notification record details. if (event.getRecords() != null) { event.getRecords().forEach(record -> { String eventName = record.getEventName(); String key = record.getS3().getObject().getKey(); logger.info(record.toString()); logger.info("Event name is {} and key is {}", eventName, key); }); } // Add logged messages to collection for batch deletion. messagesToDelete.add(DeleteMessageBatchRequestEntry.builder() .id(message.messageId()) .receiptHandle(message.receiptHandle()) .build()); }); // Delete messages. if (!messagesToDelete.isEmpty()) { sqsClient.deleteMessageBatch(DeleteMessageBatchRequest.builder() .queueUrl(queueUrl) .entries(messagesToDelete) .build() ).join(); } } // End of while block. } catch (InterruptedException | ExecutionException e) { throw new RuntimeException(e); } }

O exemplo de código a seguir mostra como:

  • Crie um tópico (FIFOou nãoFIFO).

  • Assinar várias filas no tópico com a opção de aplicar um filtro.

  • Publicar mensagens no tópico.

  • Pesquisar as filas para ver as mensagens recebidas.

SDKpara Java 2.x
nota

Tem mais sobre GitHub. Encontre o exemplo completo e saiba como configurar e executar no Repositório de exemplos de código da AWS.

package com.example.sns; import software.amazon.awssdk.auth.credentials.EnvironmentVariableCredentialsProvider; import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.sns.SnsClient; import software.amazon.awssdk.services.sns.model.CreateTopicRequest; import software.amazon.awssdk.services.sns.model.CreateTopicResponse; import software.amazon.awssdk.services.sns.model.DeleteTopicRequest; import software.amazon.awssdk.services.sns.model.DeleteTopicResponse; import software.amazon.awssdk.services.sns.model.MessageAttributeValue; import software.amazon.awssdk.services.sns.model.PublishRequest; import software.amazon.awssdk.services.sns.model.PublishResponse; import software.amazon.awssdk.services.sns.model.SetSubscriptionAttributesRequest; import software.amazon.awssdk.services.sns.model.SnsException; import software.amazon.awssdk.services.sns.model.SubscribeRequest; import software.amazon.awssdk.services.sns.model.SubscribeResponse; import software.amazon.awssdk.services.sns.model.UnsubscribeRequest; import software.amazon.awssdk.services.sns.model.UnsubscribeResponse; import software.amazon.awssdk.services.sqs.SqsClient; import software.amazon.awssdk.services.sqs.model.CreateQueueRequest; import software.amazon.awssdk.services.sqs.model.DeleteMessageBatchRequest; import software.amazon.awssdk.services.sqs.model.DeleteMessageBatchRequestEntry; import software.amazon.awssdk.services.sqs.model.DeleteQueueRequest; import software.amazon.awssdk.services.sqs.model.GetQueueAttributesRequest; import software.amazon.awssdk.services.sqs.model.GetQueueAttributesResponse; import software.amazon.awssdk.services.sqs.model.GetQueueUrlRequest; import software.amazon.awssdk.services.sqs.model.GetQueueUrlResponse; import software.amazon.awssdk.services.sqs.model.Message; import software.amazon.awssdk.services.sqs.model.QueueAttributeName; import software.amazon.awssdk.services.sqs.model.ReceiveMessageRequest; import software.amazon.awssdk.services.sqs.model.SetQueueAttributesRequest; import software.amazon.awssdk.services.sqs.model.SqsException; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Scanner; import com.google.gson.Gson; import com.google.gson.JsonArray; import com.google.gson.JsonObject; import com.google.gson.JsonPrimitive; /** * Before running this Java V2 code example, set up your development * environment, including your credentials. * * For more information, see the following documentation topic: * * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html * * This Java example performs these tasks: * * 1. Gives the user three options to choose from. * 2. Creates an Amazon Simple Notification Service (Amazon SNS) topic. * 3. Creates an Amazon Simple Queue Service (Amazon SQS) queue. * 4. Gets the SQS queue Amazon Resource Name (ARN) attribute. * 5. Attaches an AWS Identity and Access Management (IAM) policy to the queue. * 6. Subscribes to the SQS queue. * 7. Publishes a message to the topic. * 8. Displays the messages. * 9. Deletes the received message. * 10. Unsubscribes from the topic. * 11. Deletes the SNS topic. */ public class SNSWorkflow { public static final String DASHES = new String(new char[80]).replace("\0", "-"); public static void main(String[] args) { final String usage = "\n" + "Usage:\n" + " <fifoQueueARN>\n\n" + "Where:\n" + " accountId - Your AWS account Id value."; // if (args.length != 1) { // System.out.println(usage); // System.exit(1); // } SnsClient snsClient = SnsClient.builder() .region(Region.US_EAST_1) .credentialsProvider(EnvironmentVariableCredentialsProvider.create()) .build(); SqsClient sqsClient = SqsClient.builder() .region(Region.US_EAST_1) .credentialsProvider(EnvironmentVariableCredentialsProvider.create()) .build(); Scanner in = new Scanner(System.in); String accountId = "814548047983"; String useFIFO; String duplication = "n"; String topicName; String deduplicationID = null; String groupId = null; String topicArn; String sqsQueueName; String sqsQueueUrl; String sqsQueueArn; String subscriptionArn; boolean selectFIFO = false; String message; List<Message> messageList; List<String> filterList = new ArrayList<>(); String msgAttValue = ""; System.out.println(DASHES); System.out.println("Welcome to messaging with topics and queues."); System.out.println("In this workflow, you will create an SNS topic and subscribe an SQS queue to the topic.\n" + "You can select from several options for configuring the topic and the subscriptions for the queue.\n" + "You can then post to the topic and see the results in the queue."); System.out.println(DASHES); System.out.println(DASHES); System.out.println("SNS topics can be configured as FIFO (First-In-First-Out).\n" + "FIFO topics deliver messages in order and support deduplication and message filtering.\n" + "Would you like to work with FIFO topics? (y/n)"); useFIFO = in.nextLine(); if (useFIFO.compareTo("y") == 0) { selectFIFO = true; System.out.println("You have selected FIFO"); System.out.println(" Because you have chosen a FIFO topic, deduplication is supported.\n" + " Deduplication IDs are either set in the message or automatically generated from content using a hash function.\n" + " If a message is successfully published to an SNS FIFO topic, any message published and determined to have the same deduplication ID,\n" + " within the five-minute deduplication interval, is accepted but not delivered.\n" + " For more information about deduplication, see https://docs.aws.amazon.com/sns/latest/dg/fifo-message-dedup.html."); System.out.println( "Would you like to use content-based deduplication instead of entering a deduplication ID? (y/n)"); duplication = in.nextLine(); if (duplication.compareTo("y") == 0) { System.out.println("Please enter a group id value"); groupId = in.nextLine(); } else { System.out.println("Please enter deduplication Id value"); deduplicationID = in.nextLine(); System.out.println("Please enter a group id value"); groupId = in.nextLine(); } } System.out.println(DASHES); System.out.println(DASHES); System.out.println("2. Create a topic."); System.out.println("Enter a name for your SNS topic."); topicName = in.nextLine(); if (selectFIFO) { System.out.println("Because you have selected a FIFO topic, '.fifo' must be appended to the topic name."); topicName = topicName + ".fifo"; System.out.println("The name of the topic is " + topicName); topicArn = createFIFO(snsClient, topicName, duplication); System.out.println("The ARN of the FIFO topic is " + topicArn); } else { System.out.println("The name of the topic is " + topicName); topicArn = createSNSTopic(snsClient, topicName); System.out.println("The ARN of the non-FIFO topic is " + topicArn); } System.out.println(DASHES); System.out.println(DASHES); System.out.println("3. Create an SQS queue."); System.out.println("Enter a name for your SQS queue."); sqsQueueName = in.nextLine(); if (selectFIFO) { sqsQueueName = sqsQueueName + ".fifo"; } sqsQueueUrl = createQueue(sqsClient, sqsQueueName, selectFIFO); System.out.println("The queue URL is " + sqsQueueUrl); System.out.println(DASHES); System.out.println(DASHES); System.out.println("4. Get the SQS queue ARN attribute."); sqsQueueArn = getSQSQueueAttrs(sqsClient, sqsQueueUrl); System.out.println("The ARN of the new queue is " + sqsQueueArn); System.out.println(DASHES); System.out.println(DASHES); System.out.println("5. Attach an IAM policy to the queue."); // Define the policy to use. Make sure that you change the REGION if you are // running this code // in a different region. String policy = "{\n" + " \"Statement\": [\n" + " {\n" + " \"Effect\": \"Allow\",\n" + " \"Principal\": {\n" + " \"Service\": \"sns.amazonaws.com\"\n" + " },\n" + " \"Action\": \"sqs:SendMessage\",\n" + " \"Resource\": \"arn:aws:sqs:us-east-1:" + accountId + ":" + sqsQueueName + "\",\n" + " \"Condition\": {\n" + " \"ArnEquals\": {\n" + " \"aws:SourceArn\": \"arn:aws:sns:us-east-1:" + accountId + ":" + topicName + "\"\n" + " }\n" + " }\n" + " }\n" + " ]\n" + " }"; setQueueAttr(sqsClient, sqsQueueUrl, policy); System.out.println(DASHES); System.out.println(DASHES); System.out.println("6. Subscribe to the SQS queue."); if (selectFIFO) { System.out.println( "If you add a filter to this subscription, then only the filtered messages will be received in the queue.\n" + "For information about message filtering, see https://docs.aws.amazon.com/sns/latest/dg/sns-message-filtering.html\n" + "For this example, you can filter messages by a \"tone\" attribute."); System.out.println("Would you like to filter messages for " + sqsQueueName + "'s subscription to the topic " + topicName + "? (y/n)"); String filterAns = in.nextLine(); if (filterAns.compareTo("y") == 0) { boolean moreAns = false; System.out.println("You can filter messages by one or more of the following \"tone\" attributes."); System.out.println("1. cheerful"); System.out.println("2. funny"); System.out.println("3. serious"); System.out.println("4. sincere"); while (!moreAns) { System.out.println("Select a number or choose 0 to end."); String ans = in.nextLine(); switch (ans) { case "1": filterList.add("cheerful"); break; case "2": filterList.add("funny"); break; case "3": filterList.add("serious"); break; case "4": filterList.add("sincere"); break; default: moreAns = true; break; } } } } subscriptionArn = subQueue(snsClient, topicArn, sqsQueueArn, filterList); System.out.println(DASHES); System.out.println(DASHES); System.out.println("7. Publish a message to the topic."); if (selectFIFO) { System.out.println("Would you like to add an attribute to this message? (y/n)"); String msgAns = in.nextLine(); if (msgAns.compareTo("y") == 0) { System.out.println("You can filter messages by one or more of the following \"tone\" attributes."); System.out.println("1. cheerful"); System.out.println("2. funny"); System.out.println("3. serious"); System.out.println("4. sincere"); System.out.println("Select a number or choose 0 to end."); String ans = in.nextLine(); switch (ans) { case "1": msgAttValue = "cheerful"; break; case "2": msgAttValue = "funny"; break; case "3": msgAttValue = "serious"; break; default: msgAttValue = "sincere"; break; } System.out.println("Selected value is " + msgAttValue); } System.out.println("Enter a message."); message = in.nextLine(); pubMessageFIFO(snsClient, message, topicArn, msgAttValue, duplication, groupId, deduplicationID); } else { System.out.println("Enter a message."); message = in.nextLine(); pubMessage(snsClient, message, topicArn); } System.out.println(DASHES); System.out.println(DASHES); System.out.println("8. Display the message. Press any key to continue."); in.nextLine(); messageList = receiveMessages(sqsClient, sqsQueueUrl, msgAttValue); for (Message mes : messageList) { System.out.println("Message Id: " + mes.messageId()); System.out.println("Full Message: " + mes.body()); } System.out.println(DASHES); System.out.println(DASHES); System.out.println("9. Delete the received message. Press any key to continue."); in.nextLine(); deleteMessages(sqsClient, sqsQueueUrl, messageList); System.out.println(DASHES); System.out.println(DASHES); System.out.println("10. Unsubscribe from the topic and delete the queue. Press any key to continue."); in.nextLine(); unSub(snsClient, subscriptionArn); deleteSQSQueue(sqsClient, sqsQueueName); System.out.println(DASHES); System.out.println(DASHES); System.out.println("11. Delete the topic. Press any key to continue."); in.nextLine(); deleteSNSTopic(snsClient, topicArn); System.out.println(DASHES); System.out.println("The SNS/SQS workflow has completed successfully."); System.out.println(DASHES); } public static void deleteSNSTopic(SnsClient snsClient, String topicArn) { try { DeleteTopicRequest request = DeleteTopicRequest.builder() .topicArn(topicArn) .build(); DeleteTopicResponse result = snsClient.deleteTopic(request); System.out.println("Status was " + result.sdkHttpResponse().statusCode()); } catch (SnsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static void deleteSQSQueue(SqsClient sqsClient, String queueName) { try { GetQueueUrlRequest getQueueRequest = GetQueueUrlRequest.builder() .queueName(queueName) .build(); String queueUrl = sqsClient.getQueueUrl(getQueueRequest).queueUrl(); DeleteQueueRequest deleteQueueRequest = DeleteQueueRequest.builder() .queueUrl(queueUrl) .build(); sqsClient.deleteQueue(deleteQueueRequest); System.out.println(queueName + " was successfully deleted."); } catch (SqsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static void unSub(SnsClient snsClient, String subscriptionArn) { try { UnsubscribeRequest request = UnsubscribeRequest.builder() .subscriptionArn(subscriptionArn) .build(); UnsubscribeResponse result = snsClient.unsubscribe(request); System.out.println("Status was " + result.sdkHttpResponse().statusCode() + "\nSubscription was removed for " + request.subscriptionArn()); } catch (SnsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static void deleteMessages(SqsClient sqsClient, String queueUrl, List<Message> messages) { try { List<DeleteMessageBatchRequestEntry> entries = new ArrayList<>(); for (Message msg : messages) { DeleteMessageBatchRequestEntry entry = DeleteMessageBatchRequestEntry.builder() .id(msg.messageId()) .build(); entries.add(entry); } DeleteMessageBatchRequest deleteMessageBatchRequest = DeleteMessageBatchRequest.builder() .queueUrl(queueUrl) .entries(entries) .build(); sqsClient.deleteMessageBatch(deleteMessageBatchRequest); System.out.println("The batch delete of messages was successful"); } catch (SqsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static List<Message> receiveMessages(SqsClient sqsClient, String queueUrl, String msgAttValue) { try { if (msgAttValue.isEmpty()) { ReceiveMessageRequest receiveMessageRequest = ReceiveMessageRequest.builder() .queueUrl(queueUrl) .maxNumberOfMessages(5) .build(); return sqsClient.receiveMessage(receiveMessageRequest).messages(); } else { // We know there are filters on the message. ReceiveMessageRequest receiveRequest = ReceiveMessageRequest.builder() .queueUrl(queueUrl) .messageAttributeNames(msgAttValue) // Include other message attributes if needed. .maxNumberOfMessages(5) .build(); return sqsClient.receiveMessage(receiveRequest).messages(); } } catch (SqsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } return null; } public static void pubMessage(SnsClient snsClient, String message, String topicArn) { try { PublishRequest request = PublishRequest.builder() .message(message) .topicArn(topicArn) .build(); PublishResponse result = snsClient.publish(request); System.out .println(result.messageId() + " Message sent. Status is " + result.sdkHttpResponse().statusCode()); } catch (SnsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static void pubMessageFIFO(SnsClient snsClient, String message, String topicArn, String msgAttValue, String duplication, String groupId, String deduplicationID) { try { PublishRequest request; // Means the user did not choose to use a message attribute. if (msgAttValue.isEmpty()) { if (duplication.compareTo("y") == 0) { request = PublishRequest.builder() .message(message) .messageGroupId(groupId) .topicArn(topicArn) .build(); } else { request = PublishRequest.builder() .message(message) .messageDeduplicationId(deduplicationID) .messageGroupId(groupId) .topicArn(topicArn) .build(); } } else { Map<String, MessageAttributeValue> messageAttributes = new HashMap<>(); messageAttributes.put(msgAttValue, MessageAttributeValue.builder() .dataType("String") .stringValue("true") .build()); if (duplication.compareTo("y") == 0) { request = PublishRequest.builder() .message(message) .messageGroupId(groupId) .topicArn(topicArn) .build(); } else { // Create a publish request with the message and attributes. request = PublishRequest.builder() .topicArn(topicArn) .message(message) .messageDeduplicationId(deduplicationID) .messageGroupId(groupId) .messageAttributes(messageAttributes) .build(); } } // Publish the message to the topic. PublishResponse result = snsClient.publish(request); System.out .println(result.messageId() + " Message sent. Status was " + result.sdkHttpResponse().statusCode()); } catch (SnsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } // Subscribe to the SQS queue. public static String subQueue(SnsClient snsClient, String topicArn, String queueArn, List<String> filterList) { try { SubscribeRequest request; if (filterList.isEmpty()) { // No filter subscription is added. request = SubscribeRequest.builder() .protocol("sqs") .endpoint(queueArn) .returnSubscriptionArn(true) .topicArn(topicArn) .build(); SubscribeResponse result = snsClient.subscribe(request); System.out.println("The queue " + queueArn + " has been subscribed to the topic " + topicArn + "\n" + "with the subscription ARN " + result.subscriptionArn()); return result.subscriptionArn(); } else { request = SubscribeRequest.builder() .protocol("sqs") .endpoint(queueArn) .returnSubscriptionArn(true) .topicArn(topicArn) .build(); SubscribeResponse result = snsClient.subscribe(request); System.out.println("The queue " + queueArn + " has been subscribed to the topic " + topicArn + "\n" + "with the subscription ARN " + result.subscriptionArn()); String attributeName = "FilterPolicy"; Gson gson = new Gson(); String jsonString = "{\"tone\": []}"; JsonObject jsonObject = gson.fromJson(jsonString, JsonObject.class); JsonArray toneArray = jsonObject.getAsJsonArray("tone"); for (String value : filterList) { toneArray.add(new JsonPrimitive(value)); } String updatedJsonString = gson.toJson(jsonObject); System.out.println(updatedJsonString); SetSubscriptionAttributesRequest attRequest = SetSubscriptionAttributesRequest.builder() .subscriptionArn(result.subscriptionArn()) .attributeName(attributeName) .attributeValue(updatedJsonString) .build(); snsClient.setSubscriptionAttributes(attRequest); return result.subscriptionArn(); } } catch (SnsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } return ""; } // Attach a policy to the queue. public static void setQueueAttr(SqsClient sqsClient, String queueUrl, String policy) { try { Map<software.amazon.awssdk.services.sqs.model.QueueAttributeName, String> attrMap = new HashMap<>(); attrMap.put(QueueAttributeName.POLICY, policy); SetQueueAttributesRequest attributesRequest = SetQueueAttributesRequest.builder() .queueUrl(queueUrl) .attributes(attrMap) .build(); sqsClient.setQueueAttributes(attributesRequest); System.out.println("The policy has been successfully attached."); } catch (SnsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } public static String getSQSQueueAttrs(SqsClient sqsClient, String queueUrl) { // Specify the attributes to retrieve. List<QueueAttributeName> atts = new ArrayList<>(); atts.add(QueueAttributeName.QUEUE_ARN); GetQueueAttributesRequest attributesRequest = GetQueueAttributesRequest.builder() .queueUrl(queueUrl) .attributeNames(atts) .build(); GetQueueAttributesResponse response = sqsClient.getQueueAttributes(attributesRequest); Map<String, String> queueAtts = response.attributesAsStrings(); for (Map.Entry<String, String> queueAtt : queueAtts.entrySet()) return queueAtt.getValue(); return ""; } public static String createQueue(SqsClient sqsClient, String queueName, Boolean selectFIFO) { try { System.out.println("\nCreate Queue"); if (selectFIFO) { Map<QueueAttributeName, String> attrs = new HashMap<>(); attrs.put(QueueAttributeName.FIFO_QUEUE, "true"); CreateQueueRequest createQueueRequest = CreateQueueRequest.builder() .queueName(queueName) .attributes(attrs) .build(); sqsClient.createQueue(createQueueRequest); System.out.println("\nGet queue url"); GetQueueUrlResponse getQueueUrlResponse = sqsClient .getQueueUrl(GetQueueUrlRequest.builder().queueName(queueName).build()); return getQueueUrlResponse.queueUrl(); } else { CreateQueueRequest createQueueRequest = CreateQueueRequest.builder() .queueName(queueName) .build(); sqsClient.createQueue(createQueueRequest); System.out.println("\nGet queue url"); GetQueueUrlResponse getQueueUrlResponse = sqsClient .getQueueUrl(GetQueueUrlRequest.builder().queueName(queueName).build()); return getQueueUrlResponse.queueUrl(); } } catch (SqsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } return ""; } public static String createSNSTopic(SnsClient snsClient, String topicName) { CreateTopicResponse result; try { CreateTopicRequest request = CreateTopicRequest.builder() .name(topicName) .build(); result = snsClient.createTopic(request); return result.topicArn(); } catch (SnsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } return ""; } public static String createFIFO(SnsClient snsClient, String topicName, String duplication) { try { // Create a FIFO topic by using the SNS service client. Map<String, String> topicAttributes = new HashMap<>(); if (duplication.compareTo("n") == 0) { topicAttributes.put("FifoTopic", "true"); topicAttributes.put("ContentBasedDeduplication", "false"); } else { topicAttributes.put("FifoTopic", "true"); topicAttributes.put("ContentBasedDeduplication", "true"); } CreateTopicRequest topicRequest = CreateTopicRequest.builder() .name(topicName) .attributes(topicAttributes) .build(); CreateTopicResponse response = snsClient.createTopic(topicRequest); return response.topicArn(); } catch (SnsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } return ""; } }

Exemplos sem servidor

O exemplo de código a seguir mostra como implementar uma função Lambda que recebe um evento acionado pelo recebimento de mensagens de uma SQS fila. A função recupera as mensagens do parâmetro event e registra o conteúdo de cada mensagem.

SDKpara Java 2.x
nota

Tem mais sobre GitHub. Encontre o exemplo completo e saiba como configurar e executar no repositório dos Exemplos sem servidor.

Consumir um SQS evento com o Lambda usando Java.

// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. // SPDX-License-Identifier: Apache-2.0 import com.amazonaws.services.lambda.runtime.Context; import com.amazonaws.services.lambda.runtime.RequestHandler; import com.amazonaws.services.lambda.runtime.events.SQSEvent; import com.amazonaws.services.lambda.runtime.events.SQSEvent.SQSMessage; public class Function implements RequestHandler<SQSEvent, Void> { @Override public Void handleRequest(SQSEvent sqsEvent, Context context) { for (SQSMessage msg : sqsEvent.getRecords()) { processMessage(msg, context); } context.getLogger().log("done"); return null; } private void processMessage(SQSMessage msg, Context context) { try { context.getLogger().log("Processed message " + msg.getBody()); // TODO: Do interesting work based on the new message } catch (Exception e) { context.getLogger().log("An error occurred"); throw e; } } }

O exemplo de código a seguir mostra como implementar uma resposta parcial em lote para funções Lambda que recebem eventos de uma SQS fila. A função relata as falhas do item em lote na resposta, sinalizando para o Lambda tentar novamente essas mensagens posteriormente.

SDKpara Java 2.x
nota

Tem mais sobre GitHub. Encontre o exemplo completo e saiba como configurar e executar no repositório dos Exemplos sem servidor.

Relatar falhas SQS de itens em lote com o Lambda usando Java.

// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. // SPDX-License-Identifier: Apache-2.0 import com.amazonaws.services.lambda.runtime.Context; import com.amazonaws.services.lambda.runtime.RequestHandler; import com.amazonaws.services.lambda.runtime.events.SQSEvent; import com.amazonaws.services.lambda.runtime.events.SQSBatchResponse; import java.util.ArrayList; import java.util.List; public class ProcessSQSMessageBatch implements RequestHandler<SQSEvent, SQSBatchResponse> { @Override public SQSBatchResponse handleRequest(SQSEvent sqsEvent, Context context) { List<SQSBatchResponse.BatchItemFailure> batchItemFailures = new ArrayList<SQSBatchResponse.BatchItemFailure>(); String messageId = ""; for (SQSEvent.SQSMessage message : sqsEvent.getRecords()) { try { //process your message messageId = message.getMessageId(); } catch (Exception e) { //Add failed message identifier to the batchItemFailures list batchItemFailures.add(new SQSBatchResponse.BatchItemFailure(messageId)); } } return new SQSBatchResponse(batchItemFailures); } }