LongPolling.java - AWS Code Sample


<<FILENAME>> demonstrates how to enable long polling when creating a queue.

/* * Copyright 2011-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved. * * 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://aws.amazon.com/apache2.0 * * This file 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. */ package aws.example.sqs; import com.amazonaws.services.sqs.AmazonSQS; import com.amazonaws.services.sqs.AmazonSQSClientBuilder; import com.amazonaws.services.sqs.model.AmazonSQSException; import com.amazonaws.services.sqs.model.CreateQueueRequest; import com.amazonaws.services.sqs.model.SetQueueAttributesRequest; import com.amazonaws.services.sqs.model.ReceiveMessageRequest; public class LongPolling { public static void main(String[] args) { final String USAGE = "To run this example, supply the name of a queue to create and\n" + "queue url of an existing queue.\n\n" + "Ex: LongPolling <unique-queue-name> <existing-queue-url>\n"; if (args.length != 2) { System.out.println(USAGE); System.exit(1); } String queue_name = args[0]; String queue_url = args[1]; final AmazonSQS sqs = AmazonSQSClientBuilder.defaultClient(); // Enable long polling when creating a queue CreateQueueRequest create_request = new CreateQueueRequest() .withQueueName(queue_name) .addAttributesEntry("ReceiveMessageWaitTimeSeconds", "20"); try { sqs.createQueue(create_request); } catch (AmazonSQSException e) { if (!e.getErrorCode().equals("QueueAlreadyExists")) { throw e; } } // Enable long polling on an existing queue SetQueueAttributesRequest set_attrs_request = new SetQueueAttributesRequest() .withQueueUrl(queue_url) .addAttributesEntry("ReceiveMessageWaitTimeSeconds", "20"); sqs.setQueueAttributes(set_attrs_request); // Enable long polling on a message receipt ReceiveMessageRequest receive_request = new ReceiveMessageRequest() .withQueueUrl(queue_url) .withWaitTimeSeconds(20); sqs.receiveMessage(receive_request); } }

Sample Details

Service: sqs

Author: soo-aws

Type: full-example