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/*
 * Copyright 2012-2014 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.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. 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 com.amazonaws.services.sqs.buffered;

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Future;

import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.AmazonWebServiceRequest;
import com.amazonaws.ResponseMetadata;
import com.amazonaws.handlers.AsyncHandler;
import com.amazonaws.regions.Region;
import com.amazonaws.services.sqs.AmazonSQSAsync;
import com.amazonaws.services.sqs.model.AddPermissionRequest;
import com.amazonaws.services.sqs.model.ChangeMessageVisibilityBatchRequest;
import com.amazonaws.services.sqs.model.ChangeMessageVisibilityBatchRequestEntry;
import com.amazonaws.services.sqs.model.ChangeMessageVisibilityBatchResult;
import com.amazonaws.services.sqs.model.ChangeMessageVisibilityRequest;
import com.amazonaws.services.sqs.model.CreateQueueRequest;
import com.amazonaws.services.sqs.model.CreateQueueResult;
import com.amazonaws.services.sqs.model.DeleteMessageBatchRequest;
import com.amazonaws.services.sqs.model.DeleteMessageBatchRequestEntry;
import com.amazonaws.services.sqs.model.DeleteMessageBatchResult;
import com.amazonaws.services.sqs.model.DeleteMessageRequest;
import com.amazonaws.services.sqs.model.DeleteQueueRequest;
import com.amazonaws.services.sqs.model.GetQueueAttributesRequest;
import com.amazonaws.services.sqs.model.GetQueueAttributesResult;
import com.amazonaws.services.sqs.model.GetQueueUrlRequest;
import com.amazonaws.services.sqs.model.GetQueueUrlResult;
import com.amazonaws.services.sqs.model.ListDeadLetterSourceQueuesRequest;
import com.amazonaws.services.sqs.model.ListDeadLetterSourceQueuesResult;
import com.amazonaws.services.sqs.model.ListQueuesRequest;
import com.amazonaws.services.sqs.model.ListQueuesResult;
import com.amazonaws.services.sqs.model.ReceiveMessageRequest;
import com.amazonaws.services.sqs.model.ReceiveMessageResult;
import com.amazonaws.services.sqs.model.RemovePermissionRequest;
import com.amazonaws.services.sqs.model.SendMessageBatchRequest;
import com.amazonaws.services.sqs.model.SendMessageBatchRequestEntry;
import com.amazonaws.services.sqs.model.SendMessageBatchResult;
import com.amazonaws.services.sqs.model.SendMessageRequest;
import com.amazonaws.services.sqs.model.SendMessageResult;
import com.amazonaws.services.sqs.model.SetQueueAttributesRequest;
import com.amazonaws.util.VersionInfoUtils;

/**
 * AmazonSQSBufferedAsyncClient provides client-side batching of outgoing
 * sendMessage, deleteMessage and changeMessageVisibility calls. 
* * After receiving a call, rather than executing it right away, this client * waits for a configurable period of time ( default=200ms) for other calls of * the same type to come in; if such calls do come in, they are also not * executed immediately, but instead are added to the batch. When the batch * becomes full or the timeout period expires, the entire batch is executed at * once and the results are returned to the callers. This method of operation * leads to reduced operating costs (since SQS charges per call and fewer * calls are made) and increased overall throughput (since more work is * performed per call, and all fixed costs of making a call are amortized over a * greater amount of work). The cost of this method is increased latency for * individual calls, since calls spend some time waiting on the client side for * the potential batch-mates to appear before they are actually executed.
* * This client also performs pre-fetching of messages from SQS. After the first * receiveMessage call is made, the client attempts not only to satisfy that * call, but also pre-fetch extra messages to store in a temporary buffer. * Future receiveMessage calls will be satisfied from the buffer, and only if * the buffer is empty will the calling thread have to wait for the * messages to be fetched. The size of the buffer and the maximum number of * threads used for prefetching are configurable.
* * AmazonSQSBufferedAsyncClient is thread-safe.
* */ public class AmazonSQSBufferedAsyncClient implements AmazonSQSAsync { public static final String USER_AGENT = AmazonSQSBufferedAsyncClient.class.getSimpleName() + "/" + VersionInfoUtils.getVersion(); private final CachingMap buffers = new CachingMap( 16, (float) 0.75, true ); private final AmazonSQSAsync realSQS; private final QueueBufferConfig bufferConfigExemplar; public AmazonSQSBufferedAsyncClient( AmazonSQSAsync paramRealSQS) { this( paramRealSQS, new QueueBufferConfig()); } //route all future constructors to the most general one, because validation //happens here public AmazonSQSBufferedAsyncClient( AmazonSQSAsync paramRealSQS, QueueBufferConfig config) { config.validate(); realSQS = paramRealSQS; bufferConfigExemplar = config; } /* (non-Javadoc) * @see com.amazonaws.services.sqs.AmazonSQS#setRegion(com.amazonaws.regions.Region) */ @Override public void setRegion(Region region) throws IllegalArgumentException { realSQS.setRegion(region); } public void setQueueAttributes( SetQueueAttributesRequest setQueueAttributesRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(setQueueAttributesRequest, USER_AGENT); realSQS.setQueueAttributes(setQueueAttributesRequest); } public ChangeMessageVisibilityBatchResult changeMessageVisibilityBatch( ChangeMessageVisibilityBatchRequest changeMessageVisibilityBatchRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(changeMessageVisibilityBatchRequest, USER_AGENT); return realSQS.changeMessageVisibilityBatch(changeMessageVisibilityBatchRequest); } public void changeMessageVisibility( ChangeMessageVisibilityRequest changeMessageVisibilityRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(changeMessageVisibilityRequest, USER_AGENT); QueueBuffer buffer = getQBuffer(changeMessageVisibilityRequest.getQueueUrl()); buffer.changeMessageVisibilitySync(changeMessageVisibilityRequest); } public SendMessageBatchResult sendMessageBatch( SendMessageBatchRequest sendMessageBatchRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(sendMessageBatchRequest, USER_AGENT); return realSQS.sendMessageBatch(sendMessageBatchRequest); } public SendMessageResult sendMessage(SendMessageRequest sendMessageRequest) throws AmazonServiceException, AmazonClientException { QueueBuffer buffer = getQBuffer(sendMessageRequest.getQueueUrl()); ResultConverter.appendUserAgent(sendMessageRequest, USER_AGENT); return buffer.sendMessageSync(sendMessageRequest); } public ReceiveMessageResult receiveMessage( ReceiveMessageRequest receiveMessageRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(receiveMessageRequest, USER_AGENT); QueueBuffer buffer = getQBuffer(receiveMessageRequest.getQueueUrl()); return buffer.receiveMessageSync(receiveMessageRequest); } public DeleteMessageBatchResult deleteMessageBatch( DeleteMessageBatchRequest deleteMessageBatchRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(deleteMessageBatchRequest, USER_AGENT); return realSQS.deleteMessageBatch(deleteMessageBatchRequest); } public void deleteMessage(DeleteMessageRequest deleteMessageRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(deleteMessageRequest, USER_AGENT); QueueBuffer buffer = getQBuffer(deleteMessageRequest.getQueueUrl()); buffer.deleteMessageSync(deleteMessageRequest); } public void shutdown() { for( QueueBuffer buffer : buffers.values() ) { buffer.shutdown(); } realSQS.shutdown(); } public Future changeMessageVisibilityBatchAsync( ChangeMessageVisibilityBatchRequest changeMessageVisibilityBatchRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(changeMessageVisibilityBatchRequest, USER_AGENT); return realSQS.changeMessageVisibilityBatchAsync(changeMessageVisibilityBatchRequest); } public Future changeMessageVisibilityAsync( ChangeMessageVisibilityRequest changeMessageVisibilityRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(changeMessageVisibilityRequest, USER_AGENT); QueueBuffer buffer = getQBuffer(changeMessageVisibilityRequest.getQueueUrl()); return buffer.changeMessageVisibility(changeMessageVisibilityRequest, null); } public Future sendMessageBatchAsync( SendMessageBatchRequest sendMessageBatchRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(sendMessageBatchRequest, USER_AGENT); return realSQS.sendMessageBatchAsync(sendMessageBatchRequest); } public Future sendMessageAsync( SendMessageRequest sendMessageRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(sendMessageRequest, USER_AGENT); QueueBuffer buffer = getQBuffer(sendMessageRequest.getQueueUrl()); return buffer.sendMessage(sendMessageRequest, null); } public Future receiveMessageAsync( ReceiveMessageRequest receiveMessageRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(receiveMessageRequest, USER_AGENT); QueueBuffer buffer = getQBuffer(receiveMessageRequest.getQueueUrl()); return buffer.receiveMessage(receiveMessageRequest, null); } public Future deleteMessageBatchAsync( DeleteMessageBatchRequest deleteMessageBatchRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(deleteMessageBatchRequest, USER_AGENT); return realSQS.deleteMessageBatchAsync(deleteMessageBatchRequest); } public void setEndpoint(String endpoint) throws IllegalArgumentException { realSQS.setEndpoint(endpoint); } public Future setQueueAttributesAsync( SetQueueAttributesRequest setQueueAttributesRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(setQueueAttributesRequest, USER_AGENT); return realSQS.setQueueAttributesAsync(setQueueAttributesRequest); } public Future getQueueUrlAsync( GetQueueUrlRequest getQueueUrlRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(getQueueUrlRequest, USER_AGENT); return realSQS.getQueueUrlAsync(getQueueUrlRequest); } public Future removePermissionAsync( RemovePermissionRequest removePermissionRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(removePermissionRequest, USER_AGENT); return realSQS.removePermissionAsync(removePermissionRequest); } public GetQueueUrlResult getQueueUrl(GetQueueUrlRequest getQueueUrlRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(getQueueUrlRequest, USER_AGENT); return realSQS.getQueueUrl(getQueueUrlRequest); } public void removePermission(RemovePermissionRequest removePermissionRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(removePermissionRequest, USER_AGENT); realSQS.removePermission(removePermissionRequest); } public Future getQueueAttributesAsync( GetQueueAttributesRequest getQueueAttributesRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(getQueueAttributesRequest, USER_AGENT); return realSQS.getQueueAttributesAsync(getQueueAttributesRequest); } public GetQueueAttributesResult getQueueAttributes( GetQueueAttributesRequest getQueueAttributesRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(getQueueAttributesRequest, USER_AGENT); return realSQS.getQueueAttributes(getQueueAttributesRequest); } public Future deleteQueueAsync(DeleteQueueRequest deleteQueueRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(deleteQueueRequest, USER_AGENT); return realSQS.deleteQueueAsync(deleteQueueRequest); } public void deleteQueue(DeleteQueueRequest deleteQueueRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(deleteQueueRequest, USER_AGENT); realSQS.deleteQueue(deleteQueueRequest); } public Future listQueuesAsync( ListQueuesRequest listQueuesRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(listQueuesRequest, USER_AGENT); return realSQS.listQueuesAsync(listQueuesRequest); } public ListQueuesResult listQueues(ListQueuesRequest listQueuesRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(listQueuesRequest, USER_AGENT); return realSQS.listQueues(listQueuesRequest); } public Future createQueueAsync( CreateQueueRequest createQueueRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(createQueueRequest, USER_AGENT); return realSQS.createQueueAsync(createQueueRequest); } public CreateQueueResult createQueue(CreateQueueRequest createQueueRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(createQueueRequest, USER_AGENT); return realSQS.createQueue(createQueueRequest); } public Future addPermissionAsync( AddPermissionRequest addPermissionRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(addPermissionRequest, USER_AGENT); return realSQS.addPermissionAsync(addPermissionRequest); } public void addPermission(AddPermissionRequest addPermissionRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(addPermissionRequest, USER_AGENT); realSQS.addPermission(addPermissionRequest); } public ListQueuesResult listQueues() throws AmazonServiceException, AmazonClientException { return realSQS.listQueues(); } public ResponseMetadata getCachedResponseMetadata( AmazonWebServiceRequest request) { ResultConverter.appendUserAgent(request, USER_AGENT); return realSQS.getCachedResponseMetadata(request); } public Future deleteMessageAsync( DeleteMessageRequest deleteMessageRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(deleteMessageRequest, USER_AGENT); QueueBuffer buffer = getQBuffer(deleteMessageRequest.getQueueUrl()); return buffer.deleteMessage(deleteMessageRequest, null); } /** * Returns (creating it if necessary) a queue buffer for a particular queue * Since we are only storing a limited number of queue buffers, it is * possible that as a result of calling this method the least recently used * queue buffer will be removed from our queue buffer cache * * @return a queue buffer associated with the provided queue URL. Never null */ private synchronized QueueBuffer getQBuffer(String qUrl) { QueueBuffer toReturn = buffers.get(qUrl); if ( null == toReturn ) { QueueBufferConfig config = new QueueBufferConfig( bufferConfigExemplar ); toReturn = new QueueBuffer( config, qUrl, realSQS ); buffers.put(qUrl,toReturn); } return toReturn; } class CachingMap extends LinkedHashMap { private static final long serialVersionUID = 1; private static final int MAX_ENTRIES = 100; public CachingMap( int initial, float loadFactor, boolean accessOrder) { super(initial, loadFactor, accessOrder); } protected boolean removeEldestEntry(java.util.Map.Entry< String, QueueBuffer > eldest) { return size() > MAX_ENTRIES; } } public Future changeMessageVisibilityAsync( ChangeMessageVisibilityRequest changeMessageVisibilityRequest, AsyncHandler asyncHandler) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(changeMessageVisibilityRequest, USER_AGENT); QueueBuffer buffer = getQBuffer(changeMessageVisibilityRequest.getQueueUrl()); return buffer.changeMessageVisibility(changeMessageVisibilityRequest, asyncHandler); } public Future sendMessageAsync( SendMessageRequest sendMessageRequest, AsyncHandler asyncHandler) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(sendMessageRequest, USER_AGENT); QueueBuffer buffer = getQBuffer(sendMessageRequest.getQueueUrl()); return buffer.sendMessage(sendMessageRequest, asyncHandler); } public Future receiveMessageAsync( ReceiveMessageRequest receiveMessageRequest, AsyncHandler asyncHandler) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(receiveMessageRequest, USER_AGENT); QueueBuffer buffer = getQBuffer(receiveMessageRequest.getQueueUrl()); return buffer.receiveMessage(receiveMessageRequest, asyncHandler); } public Future deleteMessageAsync( DeleteMessageRequest deleteMessageRequest, AsyncHandler asyncHandler) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(deleteMessageRequest, USER_AGENT); QueueBuffer buffer = getQBuffer(deleteMessageRequest.getQueueUrl()); return buffer.deleteMessage(deleteMessageRequest, asyncHandler); } public Future setQueueAttributesAsync( SetQueueAttributesRequest setQueueAttributesRequest, AsyncHandler asyncHandler) throws AmazonServiceException, AmazonClientException { return realSQS.setQueueAttributesAsync(setQueueAttributesRequest, asyncHandler); } public Future changeMessageVisibilityBatchAsync( ChangeMessageVisibilityBatchRequest changeMessageVisibilityBatchRequest, AsyncHandler asyncHandler) throws AmazonServiceException, AmazonClientException { return realSQS.changeMessageVisibilityBatchAsync( changeMessageVisibilityBatchRequest, asyncHandler); } public Future getQueueUrlAsync( GetQueueUrlRequest getQueueUrlRequest, AsyncHandler asyncHandler) throws AmazonServiceException, AmazonClientException { return realSQS.getQueueUrlAsync(getQueueUrlRequest, asyncHandler); } public Future removePermissionAsync( RemovePermissionRequest removePermissionRequest, AsyncHandler asyncHandler) throws AmazonServiceException, AmazonClientException { return realSQS.removePermissionAsync(removePermissionRequest, asyncHandler); } public Future getQueueAttributesAsync( GetQueueAttributesRequest getQueueAttributesRequest, AsyncHandler asyncHandler) throws AmazonServiceException, AmazonClientException { return realSQS.getQueueAttributesAsync(getQueueAttributesRequest, asyncHandler); } public Future sendMessageBatchAsync( SendMessageBatchRequest sendMessageBatchRequest, AsyncHandler asyncHandler) throws AmazonServiceException, AmazonClientException { return realSQS.sendMessageBatchAsync(sendMessageBatchRequest, asyncHandler); } public Future deleteQueueAsync(DeleteQueueRequest deleteQueueRequest, AsyncHandler asyncHandler) throws AmazonServiceException, AmazonClientException { return realSQS.deleteQueueAsync(deleteQueueRequest, asyncHandler); } public Future listQueuesAsync( ListQueuesRequest listQueuesRequest, AsyncHandler asyncHandler) throws AmazonServiceException, AmazonClientException { return realSQS.listQueuesAsync(listQueuesRequest, asyncHandler); } public Future deleteMessageBatchAsync( DeleteMessageBatchRequest deleteMessageBatchRequest, AsyncHandler asyncHandler) throws AmazonServiceException, AmazonClientException { return realSQS.deleteMessageBatchAsync(deleteMessageBatchRequest, asyncHandler); } public Future createQueueAsync( CreateQueueRequest createQueueRequest, AsyncHandler asyncHandler) throws AmazonServiceException, AmazonClientException { return realSQS.createQueueAsync(createQueueRequest, asyncHandler); } public Future addPermissionAsync( AddPermissionRequest addPermissionRequest, AsyncHandler asyncHandler) throws AmazonServiceException, AmazonClientException { return realSQS.addPermissionAsync(addPermissionRequest, asyncHandler); } @Override public ListDeadLetterSourceQueuesResult listDeadLetterSourceQueues( ListDeadLetterSourceQueuesRequest listDeadLetterSourceQueuesRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(listDeadLetterSourceQueuesRequest, USER_AGENT); return realSQS.listDeadLetterSourceQueues(listDeadLetterSourceQueuesRequest); } @Override public Future listDeadLetterSourceQueuesAsync( ListDeadLetterSourceQueuesRequest listDeadLetterSourceQueuesRequest) throws AmazonServiceException, AmazonClientException { ResultConverter.appendUserAgent(listDeadLetterSourceQueuesRequest, USER_AGENT); return realSQS.listDeadLetterSourceQueuesAsync(listDeadLetterSourceQueuesRequest); } @Override public Future listDeadLetterSourceQueuesAsync( ListDeadLetterSourceQueuesRequest listDeadLetterSourceQueuesRequest, AsyncHandler asyncHandler) throws AmazonServiceException, AmazonClientException { return realSQS.listDeadLetterSourceQueuesAsync(listDeadLetterSourceQueuesRequest, asyncHandler); } @Override public void setQueueAttributes(String queueUrl, Map attributes) throws AmazonServiceException, AmazonClientException { setQueueAttributes(new SetQueueAttributesRequest(queueUrl, attributes)); } @Override public ChangeMessageVisibilityBatchResult changeMessageVisibilityBatch(String queueUrl, List entries) throws AmazonServiceException, AmazonClientException { return changeMessageVisibilityBatch( new ChangeMessageVisibilityBatchRequest(queueUrl, entries)); } @Override public void changeMessageVisibility(String queueUrl, String receiptHandle, Integer visibilityTimeout) throws AmazonServiceException, AmazonClientException { changeMessageVisibility(new ChangeMessageVisibilityRequest(queueUrl, receiptHandle, visibilityTimeout)); } @Override public GetQueueUrlResult getQueueUrl(String queueName) throws AmazonServiceException, AmazonClientException { return getQueueUrl(new GetQueueUrlRequest(queueName)); } @Override public void removePermission(String queueUrl, String label) throws AmazonServiceException, AmazonClientException { removePermission(new RemovePermissionRequest(queueUrl, label)); } @Override public SendMessageBatchResult sendMessageBatch(String queueUrl, List entries) throws AmazonServiceException, AmazonClientException { return sendMessageBatch(new SendMessageBatchRequest(queueUrl, entries)); } @Override public void deleteQueue(String queueUrl) throws AmazonServiceException, AmazonClientException { deleteQueue(new DeleteQueueRequest(queueUrl)); } @Override public SendMessageResult sendMessage(String queueUrl, String messageBody) throws AmazonServiceException, AmazonClientException { return sendMessage(new SendMessageRequest(queueUrl, messageBody)); } @Override public ReceiveMessageResult receiveMessage(String queueUrl) throws AmazonServiceException, AmazonClientException { return receiveMessage(new ReceiveMessageRequest(queueUrl)); } @Override public ListQueuesResult listQueues(String queueNamePrefix) throws AmazonServiceException, AmazonClientException { return listQueues(new ListQueuesRequest(queueNamePrefix)); } @Override public DeleteMessageBatchResult deleteMessageBatch(String queueUrl, List entries) throws AmazonServiceException, AmazonClientException { return deleteMessageBatch(new DeleteMessageBatchRequest(queueUrl, entries)); } @Override public CreateQueueResult createQueue(String queueName) throws AmazonServiceException, AmazonClientException { return createQueue(new CreateQueueRequest(queueName)); } @Override public void addPermission(String queueUrl, String label, List aWSAccountIds, List actions) throws AmazonServiceException, AmazonClientException { addPermission(new AddPermissionRequest(queueUrl, label, aWSAccountIds, actions)); } @Override public void deleteMessage(String queueUrl, String receiptHandle) throws AmazonServiceException, AmazonClientException { deleteMessage(new DeleteMessageRequest(queueUrl, receiptHandle)); } @Override public GetQueueAttributesResult getQueueAttributes(String queueUrl, List attributeNames) { return getQueueAttributes(new GetQueueAttributesRequest(queueUrl, attributeNames)); } }




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