com.amazonaws.services.sqs

Class AmazonSQSClient

java.lang.Object

com.amazonaws.AmazonWebServiceClient

com.amazonaws.services.sqs.AmazonSQSClient

All Implemented Interfaces:

AmazonSQS

Direct Known Subclasses:

AmazonSQSAsyncClient

public class AmazonSQSClient
extends AmazonWebServiceClient
implements AmazonSQS

Client for accessing AmazonSQS. All service calls made using this client are blocking, and will not return until the service call completes.

Amazon Simple Queue Service

Welcome to the Amazon Simple Queue Service API Reference . This section describes who should read this guide, how the guide is organized, and other resources related to the Amazon Simple Queue Service (Amazon SQS).

Amazon SQS offers reliable and scalable hosted queues for storing messages as they travel between computers. By using Amazon SQS, you can move data between distributed components of your applications that perform different tasks without losing messages or requiring each component to be always available.

Helpful Links:

• Current WSDL (2012-11-05)
• Making API Requests
• Amazon SQS product page
• Using Amazon SQS Dead Letter Queues
• Regions and Endpoints

We also provide SDKs that enable you to access Amazon SQS from your preferred programming language. The SDKs contain functionality that automatically takes care of tasks such as:

• Cryptographically signing your service requests
• Retrying requests
• Handling error responses

For a list of available SDKs, go to Tools for Amazon Web Services .

Field Summary

Fields inherited from class com.amazonaws.AmazonWebServiceClient

LOGGING_AWS_REQUEST_METRIC

Constructor Summary

Constructors

Constructor and Description
AmazonSQSClient() Constructs a new client to invoke service methods on AmazonSQS.
AmazonSQSClient(AWSCredentials awsCredentials) Constructs a new client to invoke service methods on AmazonSQS using the specified AWS account credentials.
AmazonSQSClient(AWSCredentials awsCredentials, ClientConfiguration clientConfiguration) Constructs a new client to invoke service methods on AmazonSQS using the specified AWS account credentials and client configuration options.
AmazonSQSClient(AWSCredentialsProvider awsCredentialsProvider) Constructs a new client to invoke service methods on AmazonSQS using the specified AWS account credentials provider.
AmazonSQSClient(AWSCredentialsProvider awsCredentialsProvider, ClientConfiguration clientConfiguration) Constructs a new client to invoke service methods on AmazonSQS using the specified AWS account credentials provider and client configuration options.
AmazonSQSClient(AWSCredentialsProvider awsCredentialsProvider, ClientConfiguration clientConfiguration, com.amazonaws.metrics.RequestMetricCollector requestMetricCollector) Constructs a new client to invoke service methods on AmazonSQS using the specified AWS account credentials provider, client configuration options, and request metric collector.
AmazonSQSClient(ClientConfiguration clientConfiguration) Constructs a new client to invoke service methods on AmazonSQS.

Method Summary

Methods

Modifier and Type	Method and Description
void	addPermission(AddPermissionRequest addPermissionRequest) Adds a permission to a queue for a specific principal .
void	addPermission(String queueUrl, String label, List<String> aWSAccountIds, List<String> actions) Adds a permission to a queue for a specific principal .
void	changeMessageVisibility(ChangeMessageVisibilityRequest changeMessageVisibilityRequest) Changes the visibility timeout of a specified message in a queue to a new value.
void	changeMessageVisibility(String queueUrl, String receiptHandle, Integer visibilityTimeout) Changes the visibility timeout of a specified message in a queue to a new value.
ChangeMessageVisibilityBatchResult	changeMessageVisibilityBatch(ChangeMessageVisibilityBatchRequest changeMessageVisibilityBatchRequest) Changes the visibility timeout of multiple messages.
ChangeMessageVisibilityBatchResult	changeMessageVisibilityBatch(String queueUrl, List<ChangeMessageVisibilityBatchRequestEntry> entries) Changes the visibility timeout of multiple messages.
CreateQueueResult	createQueue(CreateQueueRequest createQueueRequest) Creates a new queue, or returns the URL of an existing one.
CreateQueueResult	createQueue(String queueName) Creates a new queue, or returns the URL of an existing one.
void	deleteMessage(DeleteMessageRequest deleteMessageRequest) Deletes the specified message from the specified queue.
void	deleteMessage(String queueUrl, String receiptHandle) Deletes the specified message from the specified queue.
DeleteMessageBatchResult	deleteMessageBatch(DeleteMessageBatchRequest deleteMessageBatchRequest) Deletes multiple messages.
DeleteMessageBatchResult	deleteMessageBatch(String queueUrl, List<DeleteMessageBatchRequestEntry> entries) Deletes multiple messages.
void	deleteQueue(DeleteQueueRequest deleteQueueRequest) Deletes the queue specified by the queue URL , regardless of whether the queue is empty.
void	deleteQueue(String queueUrl) Deletes the queue specified by the queue URL , regardless of whether the queue is empty.
ResponseMetadata	getCachedResponseMetadata(AmazonWebServiceRequest request) Returns additional metadata for a previously executed successful, request, typically used for debugging issues where a service isn't acting as expected.
GetQueueAttributesResult	getQueueAttributes(GetQueueAttributesRequest getQueueAttributesRequest) Gets attributes for the specified queue.
GetQueueAttributesResult	getQueueAttributes(String queueUrl, List<String> attributeNames) Gets attributes for the specified queue.
GetQueueUrlResult	getQueueUrl(GetQueueUrlRequest getQueueUrlRequest) Returns the URL of an existing queue.
GetQueueUrlResult	getQueueUrl(String queueName) Returns the URL of an existing queue.
ListDeadLetterSourceQueuesResult	listDeadLetterSourceQueues(ListDeadLetterSourceQueuesRequest listDeadLetterSourceQueuesRequest) Returns a list of your queues that have the RedrivePolicy queue attribute configured with a dead letter queue.
ListQueuesResult	listQueues() Returns a list of your queues.
ListQueuesResult	listQueues(ListQueuesRequest listQueuesRequest) Returns a list of your queues.
ListQueuesResult	listQueues(String queueNamePrefix) Returns a list of your queues.
ReceiveMessageResult	receiveMessage(ReceiveMessageRequest receiveMessageRequest) Retrieves one or more messages, with a maximum limit of 10 messages, from the specified queue.
ReceiveMessageResult	receiveMessage(String queueUrl) Retrieves one or more messages, with a maximum limit of 10 messages, from the specified queue.
void	removePermission(RemovePermissionRequest removePermissionRequest) Revokes any permissions in the queue policy that matches the specified Label parameter.
void	removePermission(String queueUrl, String label) Revokes any permissions in the queue policy that matches the specified Label parameter.
SendMessageResult	sendMessage(SendMessageRequest sendMessageRequest) Delivers a message to the specified queue.
SendMessageResult	sendMessage(String queueUrl, String messageBody) Delivers a message to the specified queue.
SendMessageBatchResult	sendMessageBatch(SendMessageBatchRequest sendMessageBatchRequest) Delivers up to ten messages to the specified queue.
SendMessageBatchResult	sendMessageBatch(String queueUrl, List<SendMessageBatchRequestEntry> entries) Delivers up to ten messages to the specified queue.
void	setQueueAttributes(SetQueueAttributesRequest setQueueAttributesRequest) Sets the value of one or more queue attributes.
void	setQueueAttributes(String queueUrl, Map<String,String> attributes) Sets the value of one or more queue attributes.

Methods inherited from class com.amazonaws.AmazonWebServiceClient

addRequestHandler, addRequestHandler, getRequestMetricsCollector, getServiceName, getSignerByURI, getSignerRegionOverride, getTimeOffset, removeRequestHandler, removeRequestHandler, setConfiguration, setEndpoint, setEndpoint, setRegion, setServiceNameIntern, setSignerRegionOverride, setTimeOffset, shutdown, withTimeOffset

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.amazonaws.services.sqs.AmazonSQS

setEndpoint, setRegion, shutdown

Constructor Detail

AmazonSQSClient

public AmazonSQSClient()

Constructs a new client to invoke service methods on AmazonSQS. A credentials provider chain will be used that searches for credentials in this order:

• Environment Variables - AWS_ACCESS_KEY_ID and AWS_SECRET_KEY
• Java System Properties - aws.accessKeyId and aws.secretKey
• Instance profile credentials delivered through the Amazon EC2 metadata service

All service calls made using this new client object are blocking, and will not return until the service call completes.

See Also:

DefaultAWSCredentialsProviderChain

AmazonSQSClient

public AmazonSQSClient(ClientConfiguration clientConfiguration)

Constructs a new client to invoke service methods on AmazonSQS. A credentials provider chain will be used that searches for credentials in this order:

• Environment Variables - AWS_ACCESS_KEY_ID and AWS_SECRET_KEY
• Java System Properties - aws.accessKeyId and aws.secretKey
• Instance profile credentials delivered through the Amazon EC2 metadata service

All service calls made using this new client object are blocking, and will not return until the service call completes.

Parameters:

clientConfiguration - The client configuration options controlling how this client connects to AmazonSQS (ex: proxy settings, retry counts, etc.).

See Also:

DefaultAWSCredentialsProviderChain

AmazonSQSClient

public AmazonSQSClient(AWSCredentials awsCredentials)

Constructs a new client to invoke service methods on AmazonSQS using the specified AWS account credentials.

All service calls made using this new client object are blocking, and will not return until the service call completes.

Parameters:

awsCredentials - The AWS credentials (access key ID and secret key) to use when authenticating with AWS services.

AmazonSQSClient

public AmazonSQSClient(AWSCredentials awsCredentials,
               ClientConfiguration clientConfiguration)

Constructs a new client to invoke service methods on AmazonSQS using the specified AWS account credentials and client configuration options.

All service calls made using this new client object are blocking, and will not return until the service call completes.

Parameters:

awsCredentials - The AWS credentials (access key ID and secret key) to use when authenticating with AWS services.

clientConfiguration - The client configuration options controlling how this client connects to AmazonSQS (ex: proxy settings, retry counts, etc.).

AmazonSQSClient

public AmazonSQSClient(AWSCredentialsProvider awsCredentialsProvider)

Constructs a new client to invoke service methods on AmazonSQS using the specified AWS account credentials provider.

All service calls made using this new client object are blocking, and will not return until the service call completes.

Parameters:

awsCredentialsProvider - The AWS credentials provider which will provide credentials to authenticate requests with AWS services.

AmazonSQSClient

public AmazonSQSClient(AWSCredentialsProvider awsCredentialsProvider,
               ClientConfiguration clientConfiguration)

Constructs a new client to invoke service methods on AmazonSQS using the specified AWS account credentials provider and client configuration options.

All service calls made using this new client object are blocking, and will not return until the service call completes.

Parameters:

awsCredentialsProvider - The AWS credentials provider which will provide credentials to authenticate requests with AWS services.

clientConfiguration - The client configuration options controlling how this client connects to AmazonSQS (ex: proxy settings, retry counts, etc.).

AmazonSQSClient

public AmazonSQSClient(AWSCredentialsProvider awsCredentialsProvider,
               ClientConfiguration clientConfiguration,
               com.amazonaws.metrics.RequestMetricCollector requestMetricCollector)

Constructs a new client to invoke service methods on AmazonSQS using the specified AWS account credentials provider, client configuration options, and request metric collector.

All service calls made using this new client object are blocking, and will not return until the service call completes.

Parameters:

awsCredentialsProvider - The AWS credentials provider which will provide credentials to authenticate requests with AWS services.

clientConfiguration - The client configuration options controlling how this client connects to AmazonSQS (ex: proxy settings, retry counts, etc.).

requestMetricCollector - optional request metric collector

Method Detail

setQueueAttributes

public void setQueueAttributes(SetQueueAttributesRequest setQueueAttributesRequest)

Sets the value of one or more queue attributes. When you change a queue's attributes, the change can take up to 60 seconds for most of the attributes to propagate throughout the SQS system. Changes made to the MessageRetentionPeriod attribute can take up to 15 minutes.

NOTE:Going forward, new attributes might be added. If you are writing code that calls this action, we recommend that you structure your code so that it can handle new attributes gracefully.

Specified by:

setQueueAttributes in interface AmazonSQS

Parameters:

setQueueAttributesRequest - Container for the necessary parameters to execute the SetQueueAttributes service method on AmazonSQS.

Throws:

InvalidAttributeNameException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

changeMessageVisibilityBatch

public ChangeMessageVisibilityBatchResult changeMessageVisibilityBatch(ChangeMessageVisibilityBatchRequest changeMessageVisibilityBatchRequest)

Changes the visibility timeout of multiple messages. This is a batch version of ChangeMessageVisibility. The result of the action on each message is reported individually in the response. You can send up to 10 ChangeMessageVisibility requests with each ChangeMessageVisibilityBatch action.

IMPORTANT:Because the batch request can result in a combination of successful and unsuccessful actions, you should check for batch errors even when the call returns an HTTP status code of 200.

NOTE:Some API actions take lists of parameters. These lists are specified using the param.n notation. Values of n are integers starting from 1. For example, a parameter list with two elements looks like this:

&Attribute.1=this

&Attribute.2=that

Specified by:

changeMessageVisibilityBatch in interface AmazonSQS

Parameters:

changeMessageVisibilityBatchRequest - Container for the necessary parameters to execute the ChangeMessageVisibilityBatch service method on AmazonSQS.

Returns:

The response from the ChangeMessageVisibilityBatch service method, as returned by AmazonSQS.

Throws:

BatchEntryIdsNotDistinctException

TooManyEntriesInBatchRequestException

InvalidBatchEntryIdException

EmptyBatchRequestException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

changeMessageVisibility

public void changeMessageVisibility(ChangeMessageVisibilityRequest changeMessageVisibilityRequest)

Changes the visibility timeout of a specified message in a queue to a new value. The maximum allowed timeout value you can set the value to is 12 hours. This means you can't extend the timeout of a message in an existing queue to more than a total visibility timeout of 12 hours. (For more information visibility timeout, see Visibility Timeout in the Amazon SQS Developer Guide .)

For example, let's say you have a message and its default message visibility timeout is 30 minutes. You could call ChangeMessageVisiblity with a value of two hours and the effective timeout would be two hours and 30 minutes. When that time comes near you could again extend the time out by calling ChangeMessageVisiblity, but this time the maximum allowed timeout would be 9 hours and 30 minutes.

NOTE: There is a 120,000 limit for the number of inflight messages per queue. Messages are inflight after they have been received from the queue by a consuming component, but have not yet been deleted from the queue. If you reach the 120,000 limit, you will receive an OverLimit error message from Amazon SQS. To help avoid reaching the limit, you should delete the messages from the queue after they have been processed. You can also increase the number of queues you use to process the messages.

IMPORTANT:If you attempt to set the VisibilityTimeout to an amount more than the maximum time left, Amazon SQS returns an error. It will not automatically recalculate and increase the timeout to the maximum time remaining.

IMPORTANT:Unlike with a queue, when you change the visibility timeout for a specific message, that timeout value is applied immediately but is not saved in memory for that message. If you don't delete a message after it is received, the visibility timeout for the message the next time it is received reverts to the original timeout value, not the value you set with the ChangeMessageVisibility action.

Specified by:

changeMessageVisibility in interface AmazonSQS

Parameters:

changeMessageVisibilityRequest - Container for the necessary parameters to execute the ChangeMessageVisibility service method on AmazonSQS.

Throws:

ReceiptHandleIsInvalidException

MessageNotInflightException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

getQueueUrl

public GetQueueUrlResult getQueueUrl(GetQueueUrlRequest getQueueUrlRequest)

Returns the URL of an existing queue. This action provides a simple way to retrieve the URL of an Amazon SQS queue.

To access a queue that belongs to another AWS account, use the QueueOwnerAWSAccountId parameter to specify the account ID of the queue's owner. The queue's owner must grant you permission to access the queue. For more information about shared queue access, see AddPermission or go to Shared Queues in the Amazon SQS Developer Guide .

Specified by:

getQueueUrl in interface AmazonSQS

Parameters:

getQueueUrlRequest - Container for the necessary parameters to execute the GetQueueUrl service method on AmazonSQS.

Returns:

The response from the GetQueueUrl service method, as returned by AmazonSQS.

Throws:

QueueDoesNotExistException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

removePermission

public void removePermission(RemovePermissionRequest removePermissionRequest)

Revokes any permissions in the queue policy that matches the specified Label parameter. Only the owner of the queue can remove permissions.

Specified by:

removePermission in interface AmazonSQS

Parameters:

removePermissionRequest - Container for the necessary parameters to execute the RemovePermission service method on AmazonSQS.

Throws:

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

getQueueAttributes

public GetQueueAttributesResult getQueueAttributes(GetQueueAttributesRequest getQueueAttributesRequest)

Gets attributes for the specified queue. The following attributes are supported:

• All - returns all values.
• ApproximateNumberOfMessages - returns the approximate number of visible messages in a queue. For more information, see Resources Required to Process Messages in the Amazon SQS Developer Guide .
• ApproximateNumberOfMessagesNotVisible - returns the approximate number of messages that are not timed-out and not deleted. For more information, see Resources Required to Process Messages in the Amazon SQS Developer Guide .
• VisibilityTimeout - returns the visibility timeout for the queue. For more information about visibility timeout, see Visibility Timeout in the Amazon SQS Developer Guide .
• CreatedTimestamp - returns the time when the queue was created (epoch time in seconds).
• LastModifiedTimestamp - returns the time when the queue was last changed (epoch time in seconds).
• Policy - returns the queue's policy.
• MaximumMessageSize - returns the limit of how many bytes a message can contain before Amazon SQS rejects it.
• MessageRetentionPeriod - returns the number of seconds Amazon SQS retains a message.
• QueueArn - returns the queue's Amazon resource name (ARN).
• ApproximateNumberOfMessagesDelayed - returns the approximate number of messages that are pending to be added to the queue.
• DelaySeconds - returns the default delay on the queue in seconds.
• ReceiveMessageWaitTimeSeconds - returns the time for which a ReceiveMessage call will wait for a message to arrive.
• RedrivePolicy - returns the parameters for dead letter queue functionality of the source queue. For more information about RedrivePolicy and dead letter queues, see Using Amazon SQS Dead Letter Queues in the Amazon SQS Developer Guide .

NOTE:Going forward, new attributes might be added. If you are writing code that calls this action, we recommend that you structure your code so that it can handle new attributes gracefully.

NOTE:Some API actions take lists of parameters. These lists are specified using the param.n notation. Values of n are integers starting from 1. For example, a parameter list with two elements looks like this:

&Attribute.1=this

&Attribute.2=that

Specified by:

getQueueAttributes in interface AmazonSQS

Parameters:

getQueueAttributesRequest - Container for the necessary parameters to execute the GetQueueAttributes service method on AmazonSQS.

Returns:

The response from the GetQueueAttributes service method, as returned by AmazonSQS.

Throws:

InvalidAttributeNameException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

sendMessageBatch

public SendMessageBatchResult sendMessageBatch(SendMessageBatchRequest sendMessageBatchRequest)

Delivers up to ten messages to the specified queue. This is a batch version of SendMessage. The result of the send action on each message is reported individually in the response. The maximum allowed individual message size is 256 KB (262,144 bytes).

The maximum total payload size (i.e., the sum of all a batch's individual message lengths) is also 256 KB (262,144 bytes).

If the DelaySeconds parameter is not specified for an entry, the default for the queue is used.

IMPORTANT:The following list shows the characters (in Unicode) that are allowed in your message, according to the W3C XML specification. For more information, go to http://www.faqs.org/rfcs/rfc1321.html. If you send any characters that are not included in the list, your request will be rejected. #x9 | #xA | #xD | [#x20 to #xD7FF] | [#xE000 to #xFFFD] | [#x10000 to #x10FFFF]

IMPORTANT: Because the batch request can result in a combination of successful and unsuccessful actions, you should check for batch errors even when the call returns an HTTP status code of 200.

NOTE:Some API actions take lists of parameters. These lists are specified using the param.n notation. Values of n are integers starting from 1. For example, a parameter list with two elements looks like this:

&Attribute.1=this

&Attribute.2=that

Specified by:

sendMessageBatch in interface AmazonSQS

Parameters:

sendMessageBatchRequest - Container for the necessary parameters to execute the SendMessageBatch service method on AmazonSQS.

Returns:

The response from the SendMessageBatch service method, as returned by AmazonSQS.

Throws:

BatchEntryIdsNotDistinctException

TooManyEntriesInBatchRequestException

BatchRequestTooLongException

UnsupportedOperationException

InvalidBatchEntryIdException

EmptyBatchRequestException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

listDeadLetterSourceQueues

public ListDeadLetterSourceQueuesResult listDeadLetterSourceQueues(ListDeadLetterSourceQueuesRequest listDeadLetterSourceQueuesRequest)

Returns a list of your queues that have the RedrivePolicy queue attribute configured with a dead letter queue.

For more information about using dead letter queues, see Using Amazon SQS Dead Letter Queues .

Specified by:

listDeadLetterSourceQueues in interface AmazonSQS

Parameters:

listDeadLetterSourceQueuesRequest - Container for the necessary parameters to execute the ListDeadLetterSourceQueues service method on AmazonSQS.

Returns:

The response from the ListDeadLetterSourceQueues service method, as returned by AmazonSQS.

Throws:

QueueDoesNotExistException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

deleteQueue

public void deleteQueue(DeleteQueueRequest deleteQueueRequest)

Deletes the queue specified by the queue URL , regardless of whether the queue is empty. If the specified queue does not exist, Amazon SQS returns a successful response.

IMPORTANT: Use DeleteQueue with care; once you delete your queue, any messages in the queue are no longer available.

When you delete a queue, the deletion process takes up to 60 seconds. Requests you send involving that queue during the 60 seconds might succeed. For example, a SendMessage request might succeed, but after the 60 seconds, the queue and that message you sent no longer exist. Also, when you delete a queue, you must wait at least 60 seconds before creating a queue with the same name.

We reserve the right to delete queues that have had no activity for more than 30 days. For more information, see How Amazon SQS Queues Work in the Amazon SQS Developer Guide .

Specified by:

deleteQueue in interface AmazonSQS

Parameters:

deleteQueueRequest - Container for the necessary parameters to execute the DeleteQueue service method on AmazonSQS.

Throws:

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

sendMessage

public SendMessageResult sendMessage(SendMessageRequest sendMessageRequest)

Delivers a message to the specified queue. With Amazon SQS, you now have the ability to send large payload messages that are up to 256KB (262,144 bytes) in size. To send large payloads, you must use an AWS SDK that supports SigV4 signing. To verify whether SigV4 is supported for an AWS SDK, check the SDK release notes.

IMPORTANT: The following list shows the characters (in Unicode) allowed in your message, according to the W3C XML specification. For more information, go to http://www.w3.org/TR/REC-xml/#charsets If you send any characters not included in the list, your request will be rejected. #x9 | #xA | #xD | [#x20 to #xD7FF] | [#xE000 to #xFFFD] | [#x10000 to #x10FFFF]

Specified by:

sendMessage in interface AmazonSQS

Parameters:

sendMessageRequest - Container for the necessary parameters to execute the SendMessage service method on AmazonSQS.

Returns:

The response from the SendMessage service method, as returned by AmazonSQS.

Throws:

InvalidMessageContentsException

UnsupportedOperationException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

receiveMessage

public ReceiveMessageResult receiveMessage(ReceiveMessageRequest receiveMessageRequest)

Retrieves one or more messages, with a maximum limit of 10 messages, from the specified queue. Long poll support is enabled by using the WaitTimeSeconds parameter. For more information, see Amazon SQS Long Poll in the Amazon SQS Developer Guide .

Short poll is the default behavior where a weighted random set of machines is sampled on a ReceiveMessage call. This means only the messages on the sampled machines are returned. If the number of messages in the queue is small (less than 1000), it is likely you will get fewer messages than you requested per ReceiveMessage call. If the number of messages in the queue is extremely small, you might not receive any messages in a particular ReceiveMessage response; in which case you should repeat the request.

For each message returned, the response includes the following:

• Message body

• MD5 digest of the message body. For information about MD5, go to http://www.faqs.org/rfcs/rfc1321.html .

• Message ID you received when you sent the message to the queue.

• Receipt handle.

• Message attributes.

• MD5 digest of the message attributes.

The receipt handle is the identifier you must provide when deleting the message. For more information, see Queue and Message Identifiers in the Amazon SQS Developer Guide .

You can provide the VisibilityTimeout parameter in your request, which will be applied to the messages that Amazon SQS returns in the response. If you do not include the parameter, the overall visibility timeout for the queue is used for the returned messages. For more information, see Visibility Timeout in the Amazon SQS Developer Guide .

NOTE: Going forward, new attributes might be added. If you are writing code that calls this action, we recommend that you structure your code so that it can handle new attributes gracefully.

Specified by:

receiveMessage in interface AmazonSQS

Parameters:

receiveMessageRequest - Container for the necessary parameters to execute the ReceiveMessage service method on AmazonSQS.

Returns:

The response from the ReceiveMessage service method, as returned by AmazonSQS.

Throws:

OverLimitException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

listQueues

public ListQueuesResult listQueues(ListQueuesRequest listQueuesRequest)

Returns a list of your queues. The maximum number of queues that can be returned is 1000. If you specify a value for the optional QueueNamePrefix parameter, only queues with a name beginning with the specified value are returned.

Specified by:

listQueues in interface AmazonSQS

Parameters:

listQueuesRequest - Container for the necessary parameters to execute the ListQueues service method on AmazonSQS.

Returns:

The response from the ListQueues service method, as returned by AmazonSQS.

Throws:

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

deleteMessageBatch

public DeleteMessageBatchResult deleteMessageBatch(DeleteMessageBatchRequest deleteMessageBatchRequest)

Deletes multiple messages. This is a batch version of DeleteMessage. The result of the delete action on each message is reported individually in the response.

IMPORTANT: Because the batch request can result in a combination of successful and unsuccessful actions, you should check for batch errors even when the call returns an HTTP status code of 200.

NOTE:Some API actions take lists of parameters. These lists are specified using the param.n notation. Values of n are integers starting from 1. For example, a parameter list with two elements looks like this:

&Attribute.1=this

&Attribute.2=that

Specified by:

deleteMessageBatch in interface AmazonSQS

Parameters:

deleteMessageBatchRequest - Container for the necessary parameters to execute the DeleteMessageBatch service method on AmazonSQS.

Returns:

The response from the DeleteMessageBatch service method, as returned by AmazonSQS.

Throws:

BatchEntryIdsNotDistinctException

TooManyEntriesInBatchRequestException

InvalidBatchEntryIdException

EmptyBatchRequestException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

createQueue

public CreateQueueResult createQueue(CreateQueueRequest createQueueRequest)

Creates a new queue, or returns the URL of an existing one. When you request CreateQueue , you provide a name for the queue. To successfully create a new queue, you must provide a name that is unique within the scope of your own queues.

NOTE: If you delete a queue, you must wait at least 60 seconds before creating a queue with the same name.

You may pass one or more attributes in the request. If you do not provide a value for any attribute, the queue will have the default value for that attribute. Permitted attributes are the same that can be set using SetQueueAttributes.

NOTE: Use GetQueueUrl to get a queue's URL. GetQueueUrl requires only the QueueName parameter.

If you provide the name of an existing queue, along with the exact names and values of all the queue's attributes, CreateQueue returns the queue URL for the existing queue. If the queue name, attribute names, or attribute values do not match an existing queue, CreateQueue returns an error.

NOTE:Some API actions take lists of parameters. These lists are specified using the param.n notation. Values of n are integers starting from 1. For example, a parameter list with two elements looks like this:

&Attribute.1=this

&Attribute.2=that

Specified by:

createQueue in interface AmazonSQS

Parameters:

createQueueRequest - Container for the necessary parameters to execute the CreateQueue service method on AmazonSQS.

Returns:

The response from the CreateQueue service method, as returned by AmazonSQS.

Throws:

QueueNameExistsException

QueueDeletedRecentlyException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

addPermission

public void addPermission(AddPermissionRequest addPermissionRequest)

Adds a permission to a queue for a specific principal . This allows for sharing access to the queue.

When you create a queue, you have full control access rights for the queue. Only you (as owner of the queue) can grant or deny permissions to the queue. For more information about these permissions, see Shared Queues in the Amazon SQS Developer Guide .

NOTE: AddPermission writes an Amazon SQS-generated policy. If you want to write your own policy, use SetQueueAttributes to upload your policy. For more information about writing your own policy, see Using The Access Policy Language in the Amazon SQS Developer Guide.

NOTE:Some API actions take lists of parameters. These lists are specified using the param.n notation. Values of n are integers starting from 1. For example, a parameter list with two elements looks like this:

&Attribute.1=this

&Attribute.2=that

Specified by:

addPermission in interface AmazonSQS

Parameters:

addPermissionRequest - Container for the necessary parameters to execute the AddPermission service method on AmazonSQS.

Throws:

OverLimitException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

deleteMessage

public void deleteMessage(DeleteMessageRequest deleteMessageRequest)

Deletes the specified message from the specified queue. You specify the message by using the message's receipt handle and not the message ID you received when you sent the message. Even if the message is locked by another reader due to the visibility timeout setting, it is still deleted from the queue. If you leave a message in the queue for longer than the queue's configured retention period, Amazon SQS automatically deletes it.

NOTE: The receipt handle is associated with a specific instance of receiving the message. If you receive a message more than once, the receipt handle you get each time you receive the message is different. When you request DeleteMessage, if you don't provide the most recently received receipt handle for the message, the request will still succeed, but the message might not be deleted.

IMPORTANT: It is possible you will receive a message even after you have deleted it. This might happen on rare occasions if one of the servers storing a copy of the message is unavailable when you request to delete the message. The copy remains on the server and might be returned to you again on a subsequent receive request. You should create your system to be idempotent so that receiving a particular message more than once is not a problem.

Specified by:

deleteMessage in interface AmazonSQS

Parameters:

deleteMessageRequest - Container for the necessary parameters to execute the DeleteMessage service method on AmazonSQS.

Throws:

ReceiptHandleIsInvalidException

InvalidIdFormatException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

listQueues

public ListQueuesResult listQueues()
                            throws AmazonServiceException,
                                   AmazonClientException

Returns a list of your queues. The maximum number of queues that can be returned is 1000. If you specify a value for the optional QueueNamePrefix parameter, only queues with a name beginning with the specified value are returned.

Specified by:

listQueues in interface AmazonSQS

Returns:

The response from the ListQueues service method, as returned by AmazonSQS.

Throws:

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

setQueueAttributes

public void setQueueAttributes(String queueUrl,
                      Map<String,String> attributes)

Sets the value of one or more queue attributes. When you change a queue's attributes, the change can take up to 60 seconds for most of the attributes to propagate throughout the SQS system. Changes made to the MessageRetentionPeriod attribute can take up to 15 minutes.

NOTE:Going forward, new attributes might be added. If you are writing code that calls this action, we recommend that you structure your code so that it can handle new attributes gracefully.

Specified by:

setQueueAttributes in interface AmazonSQS

Parameters:

queueUrl - The URL of the Amazon SQS queue to take action on.

attributes - A map of attributes to set.

The following lists the names, descriptions, and values of the special request parameters the SetQueueAttributes action uses:

• DelaySeconds - The time in seconds that the delivery of all messages in the queue will be delayed. An integer from 0 to 900 (15 minutes). The default for this attribute is 0 (zero).
• MaximumMessageSize - The limit of how many bytes a message can contain before Amazon SQS rejects it. An integer from 1024 bytes (1 KiB) up to 262144 bytes (256 KiB). The default for this attribute is 262144 (256 KiB).
• MessageRetentionPeriod - The number of seconds Amazon SQS retains a message. Integer representing seconds, from 60 (1 minute) to 1209600 (14 days). The default for this attribute is 345600 (4 days).
• Policy - The queue's policy. A valid form-url-encoded policy. For more information about policy structure, see Basic Policy Structure in the Amazon SQS Developer Guide. For more information about form-url-encoding, see http://www.w3.org/MarkUp/html-spec/html-spec_8.html#SEC8.2.1.
• ReceiveMessageWaitTimeSeconds - The time for which a ReceiveMessage call will wait for a message to arrive. An integer from 0 to 20 (seconds). The default for this attribute is 0.
• VisibilityTimeout - The visibility timeout for the queue. An integer from 0 to 43200 (12 hours). The default for this attribute is 30. For more information about visibility timeout, see Visibility Timeout in the Amazon SQS Developer Guide.
• RedrivePolicy - The parameters for dead letter queue functionality of the source queue. For more information about RedrivePolicy and dead letter queues, see Using Amazon SQS Dead Letter Queues in the Amazon SQS Developer Guide.

Throws:

InvalidAttributeNameException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

changeMessageVisibilityBatch

public ChangeMessageVisibilityBatchResult changeMessageVisibilityBatch(String queueUrl,
                                                              List<ChangeMessageVisibilityBatchRequestEntry> entries)

Changes the visibility timeout of multiple messages. This is a batch version of ChangeMessageVisibility. The result of the action on each message is reported individually in the response. You can send up to 10 ChangeMessageVisibility requests with each ChangeMessageVisibilityBatch action.

IMPORTANT:Because the batch request can result in a combination of successful and unsuccessful actions, you should check for batch errors even when the call returns an HTTP status code of 200.

NOTE:Some API actions take lists of parameters. These lists are specified using the param.n notation. Values of n are integers starting from 1. For example, a parameter list with two elements looks like this:

&Attribute.1=this

&Attribute.2=that

Specified by:

changeMessageVisibilityBatch in interface AmazonSQS

Parameters:

queueUrl - The URL of the Amazon SQS queue to take action on.

entries - A list of receipt handles of the messages for which the visibility timeout must be changed.

Returns:

The response from the ChangeMessageVisibilityBatch service method, as returned by AmazonSQS.

Throws:

BatchEntryIdsNotDistinctException

TooManyEntriesInBatchRequestException

InvalidBatchEntryIdException

EmptyBatchRequestException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

changeMessageVisibility

public void changeMessageVisibility(String queueUrl,
                           String receiptHandle,
                           Integer visibilityTimeout)

Changes the visibility timeout of a specified message in a queue to a new value. The maximum allowed timeout value you can set the value to is 12 hours. This means you can't extend the timeout of a message in an existing queue to more than a total visibility timeout of 12 hours. (For more information visibility timeout, see Visibility Timeout in the Amazon SQS Developer Guide .)

For example, let's say you have a message and its default message visibility timeout is 30 minutes. You could call ChangeMessageVisiblity with a value of two hours and the effective timeout would be two hours and 30 minutes. When that time comes near you could again extend the time out by calling ChangeMessageVisiblity, but this time the maximum allowed timeout would be 9 hours and 30 minutes.

NOTE: There is a 120,000 limit for the number of inflight messages per queue. Messages are inflight after they have been received from the queue by a consuming component, but have not yet been deleted from the queue. If you reach the 120,000 limit, you will receive an OverLimit error message from Amazon SQS. To help avoid reaching the limit, you should delete the messages from the queue after they have been processed. You can also increase the number of queues you use to process the messages.

IMPORTANT:If you attempt to set the VisibilityTimeout to an amount more than the maximum time left, Amazon SQS returns an error. It will not automatically recalculate and increase the timeout to the maximum time remaining.

IMPORTANT:Unlike with a queue, when you change the visibility timeout for a specific message, that timeout value is applied immediately but is not saved in memory for that message. If you don't delete a message after it is received, the visibility timeout for the message the next time it is received reverts to the original timeout value, not the value you set with the ChangeMessageVisibility action.

Specified by:

changeMessageVisibility in interface AmazonSQS

Parameters:

queueUrl - The URL of the Amazon SQS queue to take action on.

receiptHandle - The receipt handle associated with the message whose visibility timeout should be changed. This parameter is returned by the ReceiveMessage action.

visibilityTimeout - The new value (in seconds - from 0 to 43200 - maximum 12 hours) for the message's visibility timeout.

Throws:

ReceiptHandleIsInvalidException

MessageNotInflightException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

getQueueUrl

public GetQueueUrlResult getQueueUrl(String queueName)

Returns the URL of an existing queue. This action provides a simple way to retrieve the URL of an Amazon SQS queue.

To access a queue that belongs to another AWS account, use the QueueOwnerAWSAccountId parameter to specify the account ID of the queue's owner. The queue's owner must grant you permission to access the queue. For more information about shared queue access, see AddPermission or go to Shared Queues in the Amazon SQS Developer Guide .

Specified by:

getQueueUrl in interface AmazonSQS

Parameters:

queueName - The name of the queue whose URL must be fetched. Maximum 80 characters; alphanumeric characters, hyphens (-), and underscores (_) are allowed.

Returns:

The response from the GetQueueUrl service method, as returned by AmazonSQS.

Throws:

QueueDoesNotExistException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

removePermission

public void removePermission(String queueUrl,
                    String label)

Revokes any permissions in the queue policy that matches the specified Label parameter. Only the owner of the queue can remove permissions.

Specified by:

removePermission in interface AmazonSQS

Parameters:

queueUrl - The URL of the Amazon SQS queue to take action on.

label - The identification of the permission to remove. This is the label added with the AddPermission action.

Throws:

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

getQueueAttributes

public GetQueueAttributesResult getQueueAttributes(String queueUrl,
                                          List<String> attributeNames)

Gets attributes for the specified queue. The following attributes are supported:

• All - returns all values.
• ApproximateNumberOfMessages - returns the approximate number of visible messages in a queue. For more information, see Resources Required to Process Messages in the Amazon SQS Developer Guide .
• ApproximateNumberOfMessagesNotVisible - returns the approximate number of messages that are not timed-out and not deleted. For more information, see Resources Required to Process Messages in the Amazon SQS Developer Guide .
• VisibilityTimeout - returns the visibility timeout for the queue. For more information about visibility timeout, see Visibility Timeout in the Amazon SQS Developer Guide .
• CreatedTimestamp - returns the time when the queue was created (epoch time in seconds).
• LastModifiedTimestamp - returns the time when the queue was last changed (epoch time in seconds).
• Policy - returns the queue's policy.
• MaximumMessageSize - returns the limit of how many bytes a message can contain before Amazon SQS rejects it.
• MessageRetentionPeriod - returns the number of seconds Amazon SQS retains a message.
• QueueArn - returns the queue's Amazon resource name (ARN).
• ApproximateNumberOfMessagesDelayed - returns the approximate number of messages that are pending to be added to the queue.
• DelaySeconds - returns the default delay on the queue in seconds.
• ReceiveMessageWaitTimeSeconds - returns the time for which a ReceiveMessage call will wait for a message to arrive.
• RedrivePolicy - returns the parameters for dead letter queue functionality of the source queue. For more information about RedrivePolicy and dead letter queues, see Using Amazon SQS Dead Letter Queues in the Amazon SQS Developer Guide .

NOTE:Going forward, new attributes might be added. If you are writing code that calls this action, we recommend that you structure your code so that it can handle new attributes gracefully.

NOTE:Some API actions take lists of parameters. These lists are specified using the param.n notation. Values of n are integers starting from 1. For example, a parameter list with two elements looks like this:

&Attribute.1=this

&Attribute.2=that

Specified by:

getQueueAttributes in interface AmazonSQS

Parameters:

queueUrl - The URL of the Amazon SQS queue to take action on.

attributeNames - A list of attributes to retrieve information for.

Returns:

The response from the GetQueueAttributes service method, as returned by AmazonSQS.

Throws:

InvalidAttributeNameException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

sendMessageBatch

public SendMessageBatchResult sendMessageBatch(String queueUrl,
                                      List<SendMessageBatchRequestEntry> entries)

Delivers up to ten messages to the specified queue. This is a batch version of SendMessage. The result of the send action on each message is reported individually in the response. The maximum allowed individual message size is 256 KB (262,144 bytes).

The maximum total payload size (i.e., the sum of all a batch's individual message lengths) is also 256 KB (262,144 bytes).

If the DelaySeconds parameter is not specified for an entry, the default for the queue is used.

IMPORTANT:The following list shows the characters (in Unicode) that are allowed in your message, according to the W3C XML specification. For more information, go to http://www.faqs.org/rfcs/rfc1321.html. If you send any characters that are not included in the list, your request will be rejected. #x9 | #xA | #xD | [#x20 to #xD7FF] | [#xE000 to #xFFFD] | [#x10000 to #x10FFFF]

IMPORTANT: Because the batch request can result in a combination of successful and unsuccessful actions, you should check for batch errors even when the call returns an HTTP status code of 200.

NOTE:Some API actions take lists of parameters. These lists are specified using the param.n notation. Values of n are integers starting from 1. For example, a parameter list with two elements looks like this:

&Attribute.1=this

&Attribute.2=that

Specified by:

sendMessageBatch in interface AmazonSQS

Parameters:

queueUrl - The URL of the Amazon SQS queue to take action on.

entries - A list of SendMessageBatchRequestEntry items.

Returns:

The response from the SendMessageBatch service method, as returned by AmazonSQS.

Throws:

BatchEntryIdsNotDistinctException

TooManyEntriesInBatchRequestException

BatchRequestTooLongException

UnsupportedOperationException

InvalidBatchEntryIdException

EmptyBatchRequestException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

deleteQueue

public void deleteQueue(String queueUrl)

Deletes the queue specified by the queue URL , regardless of whether the queue is empty. If the specified queue does not exist, Amazon SQS returns a successful response.

IMPORTANT: Use DeleteQueue with care; once you delete your queue, any messages in the queue are no longer available.

When you delete a queue, the deletion process takes up to 60 seconds. Requests you send involving that queue during the 60 seconds might succeed. For example, a SendMessage request might succeed, but after the 60 seconds, the queue and that message you sent no longer exist. Also, when you delete a queue, you must wait at least 60 seconds before creating a queue with the same name.

We reserve the right to delete queues that have had no activity for more than 30 days. For more information, see How Amazon SQS Queues Work in the Amazon SQS Developer Guide .

Specified by:

deleteQueue in interface AmazonSQS

Parameters:

queueUrl - The URL of the Amazon SQS queue to take action on.

Throws:

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

sendMessage

public SendMessageResult sendMessage(String queueUrl,
                            String messageBody)

Delivers a message to the specified queue. With Amazon SQS, you now have the ability to send large payload messages that are up to 256KB (262,144 bytes) in size. To send large payloads, you must use an AWS SDK that supports SigV4 signing. To verify whether SigV4 is supported for an AWS SDK, check the SDK release notes.

IMPORTANT: The following list shows the characters (in Unicode) allowed in your message, according to the W3C XML specification. For more information, go to http://www.w3.org/TR/REC-xml/#charsets If you send any characters not included in the list, your request will be rejected. #x9 | #xA | #xD | [#x20 to #xD7FF] | [#xE000 to #xFFFD] | [#x10000 to #x10FFFF]

Specified by:

sendMessage in interface AmazonSQS

Parameters:

queueUrl - The URL of the Amazon SQS queue to take action on.

messageBody - The message to send. String maximum 256 KB in size. For a list of allowed characters, see the preceding important note.

Returns:

The response from the SendMessage service method, as returned by AmazonSQS.

Throws:

InvalidMessageContentsException

UnsupportedOperationException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

receiveMessage

public ReceiveMessageResult receiveMessage(String queueUrl)

Retrieves one or more messages, with a maximum limit of 10 messages, from the specified queue. Long poll support is enabled by using the WaitTimeSeconds parameter. For more information, see Amazon SQS Long Poll in the Amazon SQS Developer Guide .

Short poll is the default behavior where a weighted random set of machines is sampled on a ReceiveMessage call. This means only the messages on the sampled machines are returned. If the number of messages in the queue is small (less than 1000), it is likely you will get fewer messages than you requested per ReceiveMessage call. If the number of messages in the queue is extremely small, you might not receive any messages in a particular ReceiveMessage response; in which case you should repeat the request.

For each message returned, the response includes the following:

• Message body

• MD5 digest of the message body. For information about MD5, go to http://www.faqs.org/rfcs/rfc1321.html .

• Message ID you received when you sent the message to the queue.

• Receipt handle.

• Message attributes.

• MD5 digest of the message attributes.

The receipt handle is the identifier you must provide when deleting the message. For more information, see Queue and Message Identifiers in the Amazon SQS Developer Guide .

You can provide the VisibilityTimeout parameter in your request, which will be applied to the messages that Amazon SQS returns in the response. If you do not include the parameter, the overall visibility timeout for the queue is used for the returned messages. For more information, see Visibility Timeout in the Amazon SQS Developer Guide .

NOTE: Going forward, new attributes might be added. If you are writing code that calls this action, we recommend that you structure your code so that it can handle new attributes gracefully.

Specified by:

receiveMessage in interface AmazonSQS

Parameters:

queueUrl - The URL of the Amazon SQS queue to take action on.

Returns:

The response from the ReceiveMessage service method, as returned by AmazonSQS.

Throws:

OverLimitException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

listQueues

public ListQueuesResult listQueues(String queueNamePrefix)

Returns a list of your queues. The maximum number of queues that can be returned is 1000. If you specify a value for the optional QueueNamePrefix parameter, only queues with a name beginning with the specified value are returned.

Specified by:

listQueues in interface AmazonSQS

Parameters:

queueNamePrefix - A string to use for filtering the list results. Only those queues whose name begins with the specified string are returned.

Returns:

The response from the ListQueues service method, as returned by AmazonSQS.

Throws:

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

deleteMessageBatch

public DeleteMessageBatchResult deleteMessageBatch(String queueUrl,
                                          List<DeleteMessageBatchRequestEntry> entries)

Deletes multiple messages. This is a batch version of DeleteMessage. The result of the delete action on each message is reported individually in the response.

IMPORTANT: Because the batch request can result in a combination of successful and unsuccessful actions, you should check for batch errors even when the call returns an HTTP status code of 200.

NOTE:Some API actions take lists of parameters. These lists are specified using the param.n notation. Values of n are integers starting from 1. For example, a parameter list with two elements looks like this:

&Attribute.1=this

&Attribute.2=that

Specified by:

deleteMessageBatch in interface AmazonSQS

Parameters:

queueUrl - The URL of the Amazon SQS queue to take action on.

entries - A list of receipt handles for the messages to be deleted.

Returns:

The response from the DeleteMessageBatch service method, as returned by AmazonSQS.

Throws:

BatchEntryIdsNotDistinctException

TooManyEntriesInBatchRequestException

InvalidBatchEntryIdException

EmptyBatchRequestException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

createQueue

public CreateQueueResult createQueue(String queueName)

Creates a new queue, or returns the URL of an existing one. When you request CreateQueue , you provide a name for the queue. To successfully create a new queue, you must provide a name that is unique within the scope of your own queues.

NOTE: If you delete a queue, you must wait at least 60 seconds before creating a queue with the same name.

You may pass one or more attributes in the request. If you do not provide a value for any attribute, the queue will have the default value for that attribute. Permitted attributes are the same that can be set using SetQueueAttributes.

NOTE: Use GetQueueUrl to get a queue's URL. GetQueueUrl requires only the QueueName parameter.

If you provide the name of an existing queue, along with the exact names and values of all the queue's attributes, CreateQueue returns the queue URL for the existing queue. If the queue name, attribute names, or attribute values do not match an existing queue, CreateQueue returns an error.

NOTE:Some API actions take lists of parameters. These lists are specified using the param.n notation. Values of n are integers starting from 1. For example, a parameter list with two elements looks like this:

&Attribute.1=this

&Attribute.2=that

Specified by:

createQueue in interface AmazonSQS

Parameters:

queueName - The name for the queue to be created.

Returns:

The response from the CreateQueue service method, as returned by AmazonSQS.

Throws:

QueueNameExistsException

QueueDeletedRecentlyException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

addPermission

public void addPermission(String queueUrl,
                 String label,
                 List<String> aWSAccountIds,
                 List<String> actions)

Adds a permission to a queue for a specific principal . This allows for sharing access to the queue.

When you create a queue, you have full control access rights for the queue. Only you (as owner of the queue) can grant or deny permissions to the queue. For more information about these permissions, see Shared Queues in the Amazon SQS Developer Guide .

NOTE: AddPermission writes an Amazon SQS-generated policy. If you want to write your own policy, use SetQueueAttributes to upload your policy. For more information about writing your own policy, see Using The Access Policy Language in the Amazon SQS Developer Guide.

NOTE:Some API actions take lists of parameters. These lists are specified using the param.n notation. Values of n are integers starting from 1. For example, a parameter list with two elements looks like this:

&Attribute.1=this

&Attribute.2=that

Specified by:

addPermission in interface AmazonSQS

Parameters:

queueUrl - The URL of the Amazon SQS queue to take action on.

label - The unique identification of the permission you're setting (e.g., AliceSendMessage). Constraints: Maximum 80 characters; alphanumeric characters, hyphens (-), and underscores (_) are allowed.

aWSAccountIds - The AWS account number of the principal who will be given permission. The principal must have an AWS account, but does not need to be signed up for Amazon SQS. For information about locating the AWS account identification, see Your AWS Identifiers in the Amazon SQS Developer Guide.

actions - The action the client wants to allow for the specified principal. The following are valid values: * | SendMessage | ReceiveMessage | DeleteMessage | ChangeMessageVisibility | GetQueueAttributes | GetQueueUrl. For more information about these actions, see Understanding Permissions in the Amazon SQS Developer Guide.

Specifying SendMessage, DeleteMessage, or ChangeMessageVisibility for the ActionName.n also grants permissions for the corresponding batch versions of those actions: SendMessageBatch, DeleteMessageBatch, and ChangeMessageVisibilityBatch.

Throws:

OverLimitException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

deleteMessage

public void deleteMessage(String queueUrl,
                 String receiptHandle)

Deletes the specified message from the specified queue. You specify the message by using the message's receipt handle and not the message ID you received when you sent the message. Even if the message is locked by another reader due to the visibility timeout setting, it is still deleted from the queue. If you leave a message in the queue for longer than the queue's configured retention period, Amazon SQS automatically deletes it.

NOTE: The receipt handle is associated with a specific instance of receiving the message. If you receive a message more than once, the receipt handle you get each time you receive the message is different. When you request DeleteMessage, if you don't provide the most recently received receipt handle for the message, the request will still succeed, but the message might not be deleted.

IMPORTANT: It is possible you will receive a message even after you have deleted it. This might happen on rare occasions if one of the servers storing a copy of the message is unavailable when you request to delete the message. The copy remains on the server and might be returned to you again on a subsequent receive request. You should create your system to be idempotent so that receiving a particular message more than once is not a problem.

Specified by:

deleteMessage in interface AmazonSQS

Parameters:

queueUrl - The URL of the Amazon SQS queue to take action on.

receiptHandle - The receipt handle associated with the message to delete.

Throws:

ReceiptHandleIsInvalidException

InvalidIdFormatException

AmazonClientException - If any internal errors are encountered inside the client while attempting to make the request or handle the response. For example if a network connection is not available.

AmazonServiceException - If an error response is returned by AmazonSQS indicating either a problem with the data in the request, or a server side issue.

getCachedResponseMetadata

public ResponseMetadata getCachedResponseMetadata(AmazonWebServiceRequest request)

Returns additional metadata for a previously executed successful, request, typically used for debugging issues where a service isn't acting as expected. This data isn't considered part of the result data returned by an operation, so it's available through this separate, diagnostic interface.

Response metadata is only cached for a limited period of time, so if you need to access this extra diagnostic information for an executed request, you should use this method to retrieve it as soon as possible after executing the request.

Specified by:

getCachedResponseMetadata in interface AmazonSQS

Parameters:

request - The originally executed request

Returns:

The response metadata for the specified request, or null if none is available.