//
// Copyright 2010-2016 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
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#import <Foundation/Foundation.h>
#import <AWSCore/AWSCore.h>
#import "AWSSQSModel.h"
#import "AWSSQSResources.h"

NS_ASSUME_NONNULL_BEGIN

/**
 <p>Welcome to the <i>Amazon Simple Queue Service API Reference</i>. 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).</p><p>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.</p><p><b>Topics</b></p><ul><li><p></p></li><li><p></p></li><li><p><a>CommonParameters</a></p></li><li><p><a>CommonErrors</a></p></li></ul><p><b>Helpful Links</b></p><ul><li><p><a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/MakingRequestsArticle.html">Making API Requests</a></p></li><li><p><a href="http://aws.amazon.com/sqs/">Amazon SQS product page</a></p></li><li><p><a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/SQSMessageAttributes.html">Using Amazon SQS Message Attributes</a></p></li><li><p><a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/SQSDeadLetterQueue.html">Using Amazon SQS Dead Letter Queues</a></p></li><li><p><a href="http://docs.aws.amazon.com/general/latest/gr/rande.html#sqs_region">Regions and Endpoints</a></p></li></ul><p>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:</p><ul><li><p>Cryptographically signing your service requests</p></li><li><p>Retrying requests</p></li><li><p>Handling error responses</p></li></ul><p>For a list of available SDKs, see <a href="http://aws.amazon.com/tools/">Tools for Amazon Web Services</a>.</p>
 */
@interface AWSSQS : AWSService

/**
 The service configuration used to instantiate this service client.
 
 @warning Once the client is instantiated, do not modify the configuration object. It may cause unspecified behaviors.
 */
@property (nonatomic, strong, readonly) AWSServiceConfiguration *configuration;

/**
 Returns the singleton service client. If the singleton object does not exist, the SDK instantiates the default service client with `defaultServiceConfiguration` from `[AWSServiceManager defaultServiceManager]`. The reference to this object is maintained by the SDK, and you do not need to retain it manually.

 For example, set the default service configuration in `- application:didFinishLaunchingWithOptions:`
 
 *Swift*

     func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
         let credentialProvider = AWSCognitoCredentialsProvider(regionType: .USEast1, identityPoolId: "YourIdentityPoolId")
         let configuration = AWSServiceConfiguration(region: .USEast1, credentialsProvider: credentialProvider)
         AWSServiceManager.defaultServiceManager().defaultServiceConfiguration = configuration

         return true
     }

 *Objective-C*

     - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
          AWSCognitoCredentialsProvider *credentialsProvider = [[AWSCognitoCredentialsProvider alloc] initWithRegionType:AWSRegionUSEast1
                                                                                                          identityPoolId:@"YourIdentityPoolId"];
          AWSServiceConfiguration *configuration = [[AWSServiceConfiguration alloc] initWithRegion:AWSRegionUSEast1
                                                                               credentialsProvider:credentialsProvider];
          [AWSServiceManager defaultServiceManager].defaultServiceConfiguration = configuration;

          return YES;
      }

 Then call the following to get the default service client:

 *Swift*

     let SQS = AWSSQS.defaultSQS()

 *Objective-C*

     AWSSQS *SQS = [AWSSQS defaultSQS];

 @return The default service client.
 */
+ (instancetype)defaultSQS;

/**
 Creates a service client with the given service configuration and registers it for the key.

 For example, set the default service configuration in `- application:didFinishLaunchingWithOptions:`

 *Swift*

     func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
         let credentialProvider = AWSCognitoCredentialsProvider(regionType: .USEast1, identityPoolId: "YourIdentityPoolId")
         let configuration = AWSServiceConfiguration(region: .USWest2, credentialsProvider: credentialProvider)
         AWSSQS.registerSQSWithConfiguration(configuration, forKey: "USWest2SQS")

         return true
     }

 *Objective-C*

     - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
         AWSCognitoCredentialsProvider *credentialsProvider = [[AWSCognitoCredentialsProvider alloc] initWithRegionType:AWSRegionUSEast1
                                                                                                         identityPoolId:@"YourIdentityPoolId"];
         AWSServiceConfiguration *configuration = [[AWSServiceConfiguration alloc] initWithRegion:AWSRegionUSWest2
                                                                              credentialsProvider:credentialsProvider];

         [AWSSQS registerSQSWithConfiguration:configuration forKey:@"USWest2SQS"];

         return YES;
     }

 Then call the following to get the service client:

 *Swift*

     let SQS = AWSSQS(forKey: "USWest2SQS")

 *Objective-C*

     AWSSQS *SQS = [AWSSQS SQSForKey:@"USWest2SQS"];

 @warning After calling this method, do not modify the configuration object. It may cause unspecified behaviors.

 @param configuration A service configuration object.
 @param key           A string to identify the service client.
 */
+ (void)registerSQSWithConfiguration:(AWSServiceConfiguration *)configuration forKey:(NSString *)key;

/**
 Retrieves the service client associated with the key. You need to call `+ registerSQSWithConfiguration:forKey:` before invoking this method.

 For example, set the default service configuration in `- application:didFinishLaunchingWithOptions:`

 *Swift*

     func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
         let credentialProvider = AWSCognitoCredentialsProvider(regionType: .USEast1, identityPoolId: "YourIdentityPoolId")
         let configuration = AWSServiceConfiguration(region: .USWest2, credentialsProvider: credentialProvider)
         AWSSQS.registerSQSWithConfiguration(configuration, forKey: "USWest2SQS")

         return true
     }

 *Objective-C*

     - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
         AWSCognitoCredentialsProvider *credentialsProvider = [[AWSCognitoCredentialsProvider alloc] initWithRegionType:AWSRegionUSEast1
                                                                                                         identityPoolId:@"YourIdentityPoolId"];
         AWSServiceConfiguration *configuration = [[AWSServiceConfiguration alloc] initWithRegion:AWSRegionUSWest2
                                                                              credentialsProvider:credentialsProvider];

         [AWSSQS registerSQSWithConfiguration:configuration forKey:@"USWest2SQS"];

         return YES;
     }

 Then call the following to get the service client:

 *Swift*

     let SQS = AWSSQS(forKey: "USWest2SQS")

 *Objective-C*

     AWSSQS *SQS = [AWSSQS SQSForKey:@"USWest2SQS"];

 @param key A string to identify the service client.

 @return An instance of the service client.
 */
+ (instancetype)SQSForKey:(NSString *)key;

/**
 Removes the service client associated with the key and release it.
 
 @warning Before calling this method, make sure no method is running on this client.
 
 @param key A string to identify the service client.
 */
+ (void)removeSQSForKey:(NSString *)key;

/**
 <p>Adds a permission to a queue for a specific <a href="http://docs.aws.amazon.com/general/latest/gr/glos-chap.html#P">principal</a>. This allows for sharing access to the queue.</p><p>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 <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/acp-overview.html">Shared Queues</a> in the <i>Amazon SQS Developer Guide</i>.</p><note><p><code>AddPermission</code> writes an Amazon SQS-generated policy. If you want to write your own policy, use <a>SetQueueAttributes</a> to upload your policy. For more information about writing your own policy, see <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/AccessPolicyLanguage.html">Using The Access Policy Language</a> in the <i>Amazon SQS Developer Guide</i>.</p></note><note><p>Some API actions take lists of parameters. These lists are specified using the <code>param.n</code> notation. Values of <code>n</code> are integers starting from 1. For example, a parameter list with two elements looks like this:</p></note><p><code>&amp;amp;Attribute.1=this</code></p><p><code>&amp;amp;Attribute.2=that</code></p>
 
 @param request A container for the necessary parameters to execute the AddPermission service method.

 @return An instance of `AWSTask`. On successful execution, `task.result` will be `nil`. On failed execution, `task.error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorOverLimit`.
 
 @see AWSSQSAddPermissionRequest
 */
- (AWSTask *)addPermission:(AWSSQSAddPermissionRequest *)request;

/**
 <p>Adds a permission to a queue for a specific <a href="http://docs.aws.amazon.com/general/latest/gr/glos-chap.html#P">principal</a>. This allows for sharing access to the queue.</p><p>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 <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/acp-overview.html">Shared Queues</a> in the <i>Amazon SQS Developer Guide</i>.</p><note><p><code>AddPermission</code> writes an Amazon SQS-generated policy. If you want to write your own policy, use <a>SetQueueAttributes</a> to upload your policy. For more information about writing your own policy, see <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/AccessPolicyLanguage.html">Using The Access Policy Language</a> in the <i>Amazon SQS Developer Guide</i>.</p></note><note><p>Some API actions take lists of parameters. These lists are specified using the <code>param.n</code> notation. Values of <code>n</code> are integers starting from 1. For example, a parameter list with two elements looks like this:</p></note><p><code>&amp;amp;Attribute.1=this</code></p><p><code>&amp;amp;Attribute.2=that</code></p>
 
 @param request A container for the necessary parameters to execute the AddPermission service method.
 @param completionHandler The completion handler to call when the load request is complete.
                          `error` - An error object that indicates why the request failed, or `nil` if the request was successful. On failed execution, `error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorOverLimit`.
 
 @see AWSSQSAddPermissionRequest
 */
- (void)addPermission:(AWSSQSAddPermissionRequest *)request completionHandler:(void (^ _Nullable)(NSError * _Nullable error))completionHandler;

/**
 <p>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 <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/AboutVT.html">Visibility Timeout</a> in the <i>Amazon SQS Developer Guide</i>.)</p><p>For example, let's say you have a message and its default message visibility timeout is 5 minutes. After 3 minutes, you call <code>ChangeMessageVisiblity</code> with a timeout of 10 minutes. At that time, the timeout for the message would be extended by 10 minutes beyond the time of the ChangeMessageVisibility call. This results in a total visibility timeout of 13 minutes. You can continue to call ChangeMessageVisibility to extend the visibility timeout to a maximum of 12 hours. If you try to extend beyond 12 hours, the request will be rejected.</p><note><p>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.</p></note><important><p>If you attempt to set the <code>VisibilityTimeout</code> 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.</p></important><important><p>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 <code>ChangeMessageVisibility</code> action.</p></important>
 
 @param request A container for the necessary parameters to execute the ChangeMessageVisibility service method.

 @return An instance of `AWSTask`. On successful execution, `task.result` will be `nil`. On failed execution, `task.error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorMessageNotInflight`, `AWSSQSErrorReceiptHandleIsInvalid`.
 
 @see AWSSQSChangeMessageVisibilityRequest
 */
- (AWSTask *)changeMessageVisibility:(AWSSQSChangeMessageVisibilityRequest *)request;

/**
 <p>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 <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/AboutVT.html">Visibility Timeout</a> in the <i>Amazon SQS Developer Guide</i>.)</p><p>For example, let's say you have a message and its default message visibility timeout is 5 minutes. After 3 minutes, you call <code>ChangeMessageVisiblity</code> with a timeout of 10 minutes. At that time, the timeout for the message would be extended by 10 minutes beyond the time of the ChangeMessageVisibility call. This results in a total visibility timeout of 13 minutes. You can continue to call ChangeMessageVisibility to extend the visibility timeout to a maximum of 12 hours. If you try to extend beyond 12 hours, the request will be rejected.</p><note><p>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.</p></note><important><p>If you attempt to set the <code>VisibilityTimeout</code> 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.</p></important><important><p>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 <code>ChangeMessageVisibility</code> action.</p></important>
 
 @param request A container for the necessary parameters to execute the ChangeMessageVisibility service method.
 @param completionHandler The completion handler to call when the load request is complete.
                          `error` - An error object that indicates why the request failed, or `nil` if the request was successful. On failed execution, `error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorMessageNotInflight`, `AWSSQSErrorReceiptHandleIsInvalid`.
 
 @see AWSSQSChangeMessageVisibilityRequest
 */
- (void)changeMessageVisibility:(AWSSQSChangeMessageVisibilityRequest *)request completionHandler:(void (^ _Nullable)(NSError * _Nullable error))completionHandler;

/**
 <p>Changes the visibility timeout of multiple messages. This is a batch version of <a>ChangeMessageVisibility</a>. The result of the action on each message is reported individually in the response. You can send up to 10 <a>ChangeMessageVisibility</a> requests with each <code>ChangeMessageVisibilityBatch</code> action.</p><important><p>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.</p></important><note><p>Some API actions take lists of parameters. These lists are specified using the <code>param.n</code> notation. Values of <code>n</code> are integers starting from 1. For example, a parameter list with two elements looks like this:</p></note><p><code>&amp;amp;Attribute.1=this</code></p><p><code>&amp;amp;Attribute.2=that</code></p>
 
 @param request A container for the necessary parameters to execute the ChangeMessageVisibilityBatch service method.

 @return An instance of `AWSTask`. On successful execution, `task.result` will contain an instance of `AWSSQSChangeMessageVisibilityBatchResult`. On failed execution, `task.error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorTooManyEntriesInBatchRequest`, `AWSSQSErrorEmptyBatchRequest`, `AWSSQSErrorBatchEntryIdsNotDistinct`, `AWSSQSErrorInvalidBatchEntryId`.
 
 @see AWSSQSChangeMessageVisibilityBatchRequest
 @see AWSSQSChangeMessageVisibilityBatchResult
 */
- (AWSTask<AWSSQSChangeMessageVisibilityBatchResult *> *)changeMessageVisibilityBatch:(AWSSQSChangeMessageVisibilityBatchRequest *)request;

/**
 <p>Changes the visibility timeout of multiple messages. This is a batch version of <a>ChangeMessageVisibility</a>. The result of the action on each message is reported individually in the response. You can send up to 10 <a>ChangeMessageVisibility</a> requests with each <code>ChangeMessageVisibilityBatch</code> action.</p><important><p>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.</p></important><note><p>Some API actions take lists of parameters. These lists are specified using the <code>param.n</code> notation. Values of <code>n</code> are integers starting from 1. For example, a parameter list with two elements looks like this:</p></note><p><code>&amp;amp;Attribute.1=this</code></p><p><code>&amp;amp;Attribute.2=that</code></p>
 
 @param request A container for the necessary parameters to execute the ChangeMessageVisibilityBatch service method.
 @param completionHandler The completion handler to call when the load request is complete.
                          `response` - A response object, or `nil` if the request failed.
                          `error` - An error object that indicates why the request failed, or `nil` if the request was successful. On failed execution, `error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorTooManyEntriesInBatchRequest`, `AWSSQSErrorEmptyBatchRequest`, `AWSSQSErrorBatchEntryIdsNotDistinct`, `AWSSQSErrorInvalidBatchEntryId`.
 
 @see AWSSQSChangeMessageVisibilityBatchRequest
 @see AWSSQSChangeMessageVisibilityBatchResult
 */
- (void)changeMessageVisibilityBatch:(AWSSQSChangeMessageVisibilityBatchRequest *)request completionHandler:(void (^ _Nullable)(AWSSQSChangeMessageVisibilityBatchResult * _Nullable response, NSError * _Nullable error))completionHandler;

/**
 <p>Creates a new standard or FIFO queue or returns the URL of an existing queue. You can pass one or more attributes in the request.</p><ul><li><p>If you don't specify the <code>FifoQueue</code> attribute, Amazon SQS creates a standard queue.</p><note><p> You can't change the queue type after you create it and you can't convert an existing standard queue into a FIFO queue. You must either create a new FIFO queue for your application or delete your existing standard queue and recreate it as a FIFO queue. For more information, see <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/FIFO-queues-moving.html"> Moving From a Standard Queue to a FIFO Queue</a> in the <i>Amazon SQS Developer Guide</i>. </p></note></li><li><p>If you don't provide a value for an attribute, the queue is created with the default value for the attribute.</p></li><li><p>If you delete a queue, you must wait at least 60 seconds before creating a queue with the same name.</p></li></ul><p>To successfully create a new queue, you must provide a queue name that adheres to the <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/limits-queues.html">limits related to queues</a> and is unique within the scope of your queues.</p><p>To get the queue URL, use the <a>GetQueueUrl</a> action. <a>GetQueueUrl</a> requires only the <code>QueueName</code> parameter.</p><ul><li><p>If you provide the name of an existing queue along with the exact names and values of all the queue's attributes, <code>CreateQueue</code> returns the queue URL for the existing queue.</p></li><li><p>If the queue name, attribute names, or attribute values don't match an existing queue, <code>CreateQueue</code> returns an error.</p></li></ul><p>Some API actions take lists of parameters. Specify these lists using the <code>param.n</code> notation. Values of <code>n</code> are integers starting from 1. The following is an example of a parameter list with two elements:</p><p><code>&amp;amp;Attribute.1=this</code></p><p><code>&amp;amp;Attribute.2=that</code></p>
 
 @param request A container for the necessary parameters to execute the CreateQueue service method.

 @return An instance of `AWSTask`. On successful execution, `task.result` will contain an instance of `AWSSQSCreateQueueResult`. On failed execution, `task.error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorQueueDeletedRecently`, `AWSSQSErrorQueueNameExists`.
 
 @see AWSSQSCreateQueueRequest
 @see AWSSQSCreateQueueResult
 */
- (AWSTask<AWSSQSCreateQueueResult *> *)createQueue:(AWSSQSCreateQueueRequest *)request;

/**
 <p>Creates a new standard or FIFO queue or returns the URL of an existing queue. You can pass one or more attributes in the request.</p><ul><li><p>If you don't specify the <code>FifoQueue</code> attribute, Amazon SQS creates a standard queue.</p><note><p> You can't change the queue type after you create it and you can't convert an existing standard queue into a FIFO queue. You must either create a new FIFO queue for your application or delete your existing standard queue and recreate it as a FIFO queue. For more information, see <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/FIFO-queues-moving.html"> Moving From a Standard Queue to a FIFO Queue</a> in the <i>Amazon SQS Developer Guide</i>. </p></note></li><li><p>If you don't provide a value for an attribute, the queue is created with the default value for the attribute.</p></li><li><p>If you delete a queue, you must wait at least 60 seconds before creating a queue with the same name.</p></li></ul><p>To successfully create a new queue, you must provide a queue name that adheres to the <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/limits-queues.html">limits related to queues</a> and is unique within the scope of your queues.</p><p>To get the queue URL, use the <a>GetQueueUrl</a> action. <a>GetQueueUrl</a> requires only the <code>QueueName</code> parameter.</p><ul><li><p>If you provide the name of an existing queue along with the exact names and values of all the queue's attributes, <code>CreateQueue</code> returns the queue URL for the existing queue.</p></li><li><p>If the queue name, attribute names, or attribute values don't match an existing queue, <code>CreateQueue</code> returns an error.</p></li></ul><p>Some API actions take lists of parameters. Specify these lists using the <code>param.n</code> notation. Values of <code>n</code> are integers starting from 1. The following is an example of a parameter list with two elements:</p><p><code>&amp;amp;Attribute.1=this</code></p><p><code>&amp;amp;Attribute.2=that</code></p>
 
 @param request A container for the necessary parameters to execute the CreateQueue service method.
 @param completionHandler The completion handler to call when the load request is complete.
                          `response` - A response object, or `nil` if the request failed.
                          `error` - An error object that indicates why the request failed, or `nil` if the request was successful. On failed execution, `error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorQueueDeletedRecently`, `AWSSQSErrorQueueNameExists`.
 
 @see AWSSQSCreateQueueRequest
 @see AWSSQSCreateQueueResult
 */
- (void)createQueue:(AWSSQSCreateQueueRequest *)request completionHandler:(void (^ _Nullable)(AWSSQSCreateQueueResult * _Nullable response, NSError * _Nullable error))completionHandler;

/**
 <p> Deletes the specified message from the specified queue. You specify the message by using the message's <code>receipt handle</code> and not the <code>message ID</code> 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. </p><note><p> 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 <code>DeleteMessage</code>, 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. </p></note><important><p>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.</p></important>
 
 @param request A container for the necessary parameters to execute the DeleteMessage service method.

 @return An instance of `AWSTask`. On successful execution, `task.result` will be `nil`. On failed execution, `task.error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorInvalidIdFormat`, `AWSSQSErrorReceiptHandleIsInvalid`.
 
 @see AWSSQSDeleteMessageRequest
 */
- (AWSTask *)deleteMessage:(AWSSQSDeleteMessageRequest *)request;

/**
 <p> Deletes the specified message from the specified queue. You specify the message by using the message's <code>receipt handle</code> and not the <code>message ID</code> 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. </p><note><p> 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 <code>DeleteMessage</code>, 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. </p></note><important><p>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.</p></important>
 
 @param request A container for the necessary parameters to execute the DeleteMessage service method.
 @param completionHandler The completion handler to call when the load request is complete.
                          `error` - An error object that indicates why the request failed, or `nil` if the request was successful. On failed execution, `error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorInvalidIdFormat`, `AWSSQSErrorReceiptHandleIsInvalid`.
 
 @see AWSSQSDeleteMessageRequest
 */
- (void)deleteMessage:(AWSSQSDeleteMessageRequest *)request completionHandler:(void (^ _Nullable)(NSError * _Nullable error))completionHandler;

/**
 <p>Deletes up to ten messages from the specified queue. This is a batch version of <a>DeleteMessage</a>. The result of the delete action on each message is reported individually in the response.</p><important><p>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.</p></important><note><p>Some API actions take lists of parameters. These lists are specified using the <code>param.n</code> notation. Values of <code>n</code> are integers starting from 1. For example, a parameter list with two elements looks like this:</p></note><p><code>&amp;amp;Attribute.1=this</code></p><p><code>&amp;amp;Attribute.2=that</code></p>
 
 @param request A container for the necessary parameters to execute the DeleteMessageBatch service method.

 @return An instance of `AWSTask`. On successful execution, `task.result` will contain an instance of `AWSSQSDeleteMessageBatchResult`. On failed execution, `task.error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorTooManyEntriesInBatchRequest`, `AWSSQSErrorEmptyBatchRequest`, `AWSSQSErrorBatchEntryIdsNotDistinct`, `AWSSQSErrorInvalidBatchEntryId`.
 
 @see AWSSQSDeleteMessageBatchRequest
 @see AWSSQSDeleteMessageBatchResult
 */
- (AWSTask<AWSSQSDeleteMessageBatchResult *> *)deleteMessageBatch:(AWSSQSDeleteMessageBatchRequest *)request;

/**
 <p>Deletes up to ten messages from the specified queue. This is a batch version of <a>DeleteMessage</a>. The result of the delete action on each message is reported individually in the response.</p><important><p>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.</p></important><note><p>Some API actions take lists of parameters. These lists are specified using the <code>param.n</code> notation. Values of <code>n</code> are integers starting from 1. For example, a parameter list with two elements looks like this:</p></note><p><code>&amp;amp;Attribute.1=this</code></p><p><code>&amp;amp;Attribute.2=that</code></p>
 
 @param request A container for the necessary parameters to execute the DeleteMessageBatch service method.
 @param completionHandler The completion handler to call when the load request is complete.
                          `response` - A response object, or `nil` if the request failed.
                          `error` - An error object that indicates why the request failed, or `nil` if the request was successful. On failed execution, `error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorTooManyEntriesInBatchRequest`, `AWSSQSErrorEmptyBatchRequest`, `AWSSQSErrorBatchEntryIdsNotDistinct`, `AWSSQSErrorInvalidBatchEntryId`.
 
 @see AWSSQSDeleteMessageBatchRequest
 @see AWSSQSDeleteMessageBatchResult
 */
- (void)deleteMessageBatch:(AWSSQSDeleteMessageBatchRequest *)request completionHandler:(void (^ _Nullable)(AWSSQSDeleteMessageBatchResult * _Nullable response, NSError * _Nullable error))completionHandler;

/**
 <p> Deletes the queue specified by the <b>queue URL</b>, regardless of whether the queue is empty. If the specified queue doesn't exist, Amazon SQS returns a successful response. </p><important><p> Use <code>DeleteQueue</code> with care; once you delete your queue, any messages in the queue are no longer available. </p></important><p> 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 <a>SendMessage</a> 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. </p><p>We reserve the right to delete queues that have had no activity for more than 30 days. For more information, see <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/SQSConcepts.html">How Amazon SQS Queues Work</a> in the <i>Amazon SQS Developer Guide</i>. </p>
 
 @param request A container for the necessary parameters to execute the DeleteQueue service method.

 @return An instance of `AWSTask`. On successful execution, `task.result` will be `nil`.
 
 @see AWSSQSDeleteQueueRequest
 */
- (AWSTask *)deleteQueue:(AWSSQSDeleteQueueRequest *)request;

/**
 <p> Deletes the queue specified by the <b>queue URL</b>, regardless of whether the queue is empty. If the specified queue doesn't exist, Amazon SQS returns a successful response. </p><important><p> Use <code>DeleteQueue</code> with care; once you delete your queue, any messages in the queue are no longer available. </p></important><p> 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 <a>SendMessage</a> 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. </p><p>We reserve the right to delete queues that have had no activity for more than 30 days. For more information, see <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/SQSConcepts.html">How Amazon SQS Queues Work</a> in the <i>Amazon SQS Developer Guide</i>. </p>
 
 @param request A container for the necessary parameters to execute the DeleteQueue service method.
 @param completionHandler The completion handler to call when the load request is complete.
                          `error` - An error object that indicates why the request failed, or `nil` if the request was successful.
 
 @see AWSSQSDeleteQueueRequest
 */
- (void)deleteQueue:(AWSSQSDeleteQueueRequest *)request completionHandler:(void (^ _Nullable)(NSError * _Nullable error))completionHandler;

/**
 <p>Gets attributes for the specified queue.</p><note><p>Some API actions take lists of parameters. These lists are specified using the <code>param.n</code> notation. Values of <code>n</code> are integers starting from 1. For example, a parameter list with two elements looks like this:</p></note><p><code>&amp;amp;Attribute.1=this</code></p><p><code>&amp;amp;Attribute.2=that</code></p>
 
 @param request A container for the necessary parameters to execute the GetQueueAttributes service method.

 @return An instance of `AWSTask`. On successful execution, `task.result` will contain an instance of `AWSSQSGetQueueAttributesResult`. On failed execution, `task.error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorInvalidAttributeName`.
 
 @see AWSSQSGetQueueAttributesRequest
 @see AWSSQSGetQueueAttributesResult
 */
- (AWSTask<AWSSQSGetQueueAttributesResult *> *)getQueueAttributes:(AWSSQSGetQueueAttributesRequest *)request;

/**
 <p>Gets attributes for the specified queue.</p><note><p>Some API actions take lists of parameters. These lists are specified using the <code>param.n</code> notation. Values of <code>n</code> are integers starting from 1. For example, a parameter list with two elements looks like this:</p></note><p><code>&amp;amp;Attribute.1=this</code></p><p><code>&amp;amp;Attribute.2=that</code></p>
 
 @param request A container for the necessary parameters to execute the GetQueueAttributes service method.
 @param completionHandler The completion handler to call when the load request is complete.
                          `response` - A response object, or `nil` if the request failed.
                          `error` - An error object that indicates why the request failed, or `nil` if the request was successful. On failed execution, `error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorInvalidAttributeName`.
 
 @see AWSSQSGetQueueAttributesRequest
 @see AWSSQSGetQueueAttributesResult
 */
- (void)getQueueAttributes:(AWSSQSGetQueueAttributesRequest *)request completionHandler:(void (^ _Nullable)(AWSSQSGetQueueAttributesResult * _Nullable response, NSError * _Nullable error))completionHandler;

/**
 <p>Returns the URL of an existing queue. This action provides a simple way to retrieve the URL of an Amazon SQS queue.</p><p> To access a queue that belongs to another AWS account, use the <code>QueueOwnerAWSAccountId</code> 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 <a>AddPermission</a> or see <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/acp-overview.html">Shared Queues</a> in the <i>Amazon SQS Developer Guide</i>. </p>
 
 @param request A container for the necessary parameters to execute the GetQueueUrl service method.

 @return An instance of `AWSTask`. On successful execution, `task.result` will contain an instance of `AWSSQSGetQueueUrlResult`. On failed execution, `task.error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorQueueDoesNotExist`.
 
 @see AWSSQSGetQueueUrlRequest
 @see AWSSQSGetQueueUrlResult
 */
- (AWSTask<AWSSQSGetQueueUrlResult *> *)getQueueUrl:(AWSSQSGetQueueUrlRequest *)request;

/**
 <p>Returns the URL of an existing queue. This action provides a simple way to retrieve the URL of an Amazon SQS queue.</p><p> To access a queue that belongs to another AWS account, use the <code>QueueOwnerAWSAccountId</code> 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 <a>AddPermission</a> or see <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/acp-overview.html">Shared Queues</a> in the <i>Amazon SQS Developer Guide</i>. </p>
 
 @param request A container for the necessary parameters to execute the GetQueueUrl service method.
 @param completionHandler The completion handler to call when the load request is complete.
                          `response` - A response object, or `nil` if the request failed.
                          `error` - An error object that indicates why the request failed, or `nil` if the request was successful. On failed execution, `error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorQueueDoesNotExist`.
 
 @see AWSSQSGetQueueUrlRequest
 @see AWSSQSGetQueueUrlResult
 */
- (void)getQueueUrl:(AWSSQSGetQueueUrlRequest *)request completionHandler:(void (^ _Nullable)(AWSSQSGetQueueUrlResult * _Nullable response, NSError * _Nullable error))completionHandler;

/**
 <p>Returns a list of your queues that have the RedrivePolicy queue attribute configured with a dead letter queue.</p><p>For more information about using dead letter queues, see <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/SQSDeadLetterQueue.html">Using Amazon SQS Dead Letter Queues</a> in the <i>Amazon SQS Developer Guide</i>.</p>
 
 @param request A container for the necessary parameters to execute the ListDeadLetterSourceQueues service method.

 @return An instance of `AWSTask`. On successful execution, `task.result` will contain an instance of `AWSSQSListDeadLetterSourceQueuesResult`. On failed execution, `task.error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorQueueDoesNotExist`.
 
 @see AWSSQSListDeadLetterSourceQueuesRequest
 @see AWSSQSListDeadLetterSourceQueuesResult
 */
- (AWSTask<AWSSQSListDeadLetterSourceQueuesResult *> *)listDeadLetterSourceQueues:(AWSSQSListDeadLetterSourceQueuesRequest *)request;

/**
 <p>Returns a list of your queues that have the RedrivePolicy queue attribute configured with a dead letter queue.</p><p>For more information about using dead letter queues, see <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/SQSDeadLetterQueue.html">Using Amazon SQS Dead Letter Queues</a> in the <i>Amazon SQS Developer Guide</i>.</p>
 
 @param request A container for the necessary parameters to execute the ListDeadLetterSourceQueues service method.
 @param completionHandler The completion handler to call when the load request is complete.
                          `response` - A response object, or `nil` if the request failed.
                          `error` - An error object that indicates why the request failed, or `nil` if the request was successful. On failed execution, `error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorQueueDoesNotExist`.
 
 @see AWSSQSListDeadLetterSourceQueuesRequest
 @see AWSSQSListDeadLetterSourceQueuesResult
 */
- (void)listDeadLetterSourceQueues:(AWSSQSListDeadLetterSourceQueuesRequest *)request completionHandler:(void (^ _Nullable)(AWSSQSListDeadLetterSourceQueuesResult * _Nullable response, NSError * _Nullable error))completionHandler;

/**
 <p>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 <code>QueueNamePrefix</code> parameter, only queues with a name beginning with the specified value are returned.</p>
 
 @param request A container for the necessary parameters to execute the ListQueues service method.

 @return An instance of `AWSTask`. On successful execution, `task.result` will contain an instance of `AWSSQSListQueuesResult`.
 
 @see AWSSQSListQueuesRequest
 @see AWSSQSListQueuesResult
 */
- (AWSTask<AWSSQSListQueuesResult *> *)listQueues:(AWSSQSListQueuesRequest *)request;

/**
 <p>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 <code>QueueNamePrefix</code> parameter, only queues with a name beginning with the specified value are returned.</p>
 
 @param request A container for the necessary parameters to execute the ListQueues service method.
 @param completionHandler The completion handler to call when the load request is complete.
                          `response` - A response object, or `nil` if the request failed.
                          `error` - An error object that indicates why the request failed, or `nil` if the request was successful.
 
 @see AWSSQSListQueuesRequest
 @see AWSSQSListQueuesResult
 */
- (void)listQueues:(AWSSQSListQueuesRequest *)request completionHandler:(void (^ _Nullable)(AWSSQSListQueuesResult * _Nullable response, NSError * _Nullable error))completionHandler;

/**
 <p>Deletes the messages in a queue specified by the <b>queue URL</b>.</p><important><p>When you use the <code>PurgeQueue</code> API, the deleted messages in the queue can't be retrieved.</p></important><p>When you purge a queue, the message deletion process takes up to 60 seconds. All messages sent to the queue before calling <code>PurgeQueue</code> will be deleted; messages sent to the queue while it is being purged might be deleted. While the queue is being purged, messages sent to the queue before <code>PurgeQueue</code> was called might be received, but will be deleted within the next minute.</p>
 
 @param request A container for the necessary parameters to execute the PurgeQueue service method.

 @return An instance of `AWSTask`. On successful execution, `task.result` will be `nil`. On failed execution, `task.error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorQueueDoesNotExist`, `AWSSQSErrorPurgeQueueInProgress`.
 
 @see AWSSQSPurgeQueueRequest
 */
- (AWSTask *)purgeQueue:(AWSSQSPurgeQueueRequest *)request;

/**
 <p>Deletes the messages in a queue specified by the <b>queue URL</b>.</p><important><p>When you use the <code>PurgeQueue</code> API, the deleted messages in the queue can't be retrieved.</p></important><p>When you purge a queue, the message deletion process takes up to 60 seconds. All messages sent to the queue before calling <code>PurgeQueue</code> will be deleted; messages sent to the queue while it is being purged might be deleted. While the queue is being purged, messages sent to the queue before <code>PurgeQueue</code> was called might be received, but will be deleted within the next minute.</p>
 
 @param request A container for the necessary parameters to execute the PurgeQueue service method.
 @param completionHandler The completion handler to call when the load request is complete.
                          `error` - An error object that indicates why the request failed, or `nil` if the request was successful. On failed execution, `error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorQueueDoesNotExist`, `AWSSQSErrorPurgeQueueInProgress`.
 
 @see AWSSQSPurgeQueueRequest
 */
- (void)purgeQueue:(AWSSQSPurgeQueueRequest *)request completionHandler:(void (^ _Nullable)(NSError * _Nullable error))completionHandler;

/**
 <p>Retrieves one or more messages, with a maximum limit of 10 messages, from the specified queue. Long poll support is enabled by using the <code>WaitTimeSeconds</code> parameter. For more information, see <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-long-polling.html">Amazon SQS Long Poll</a> in the <i>Amazon SQS Developer Guide</i>. </p><p> Short poll is the default behavior where a weighted random set of machines is sampled on a <code>ReceiveMessage</code> 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 <code>ReceiveMessage</code> call. If the number of messages in the queue is extremely small, you might not receive any messages in a particular <code>ReceiveMessage</code> response; in which case you should repeat the request. </p><p>For each message returned, the response includes the following:</p><ul><li><p>Message body</p></li><li><p> MD5 digest of the message body. For information about MD5, see <a href="https://www.ietf.org/rfc/rfc1321.txt">RFC1321</a>. </p></li><li><p>Message ID you received when you sent the message to the queue.</p></li><li><p>Receipt handle.</p></li><li><p>Message attributes.</p></li><li><p>MD5 digest of the message attributes.</p></li></ul><p> The receipt handle is the identifier you must provide when deleting the message. For more information, see <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/ImportantIdentifiers.html">Queue and Message Identifiers</a> in the <i>Amazon SQS Developer Guide</i>. </p><p> You can provide the <code>VisibilityTimeout</code> parameter in your request, which will be applied to the messages that Amazon SQS returns in the response. If you don't include the parameter, the overall visibility timeout for the queue is used for the returned messages. For more information, see <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/AboutVT.html">Visibility Timeout</a> in the <i>Amazon SQS Developer Guide</i>. </p><p> A message that is not deleted or a message whose visibility is not extended before the visibility timeout expires counts as a failed receive. Depending on the configuration of the queue, the message might be sent to the dead letter queue. </p><note><p>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.</p></note>
 
 @param request A container for the necessary parameters to execute the ReceiveMessage service method.

 @return An instance of `AWSTask`. On successful execution, `task.result` will contain an instance of `AWSSQSReceiveMessageResult`. On failed execution, `task.error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorOverLimit`.
 
 @see AWSSQSReceiveMessageRequest
 @see AWSSQSReceiveMessageResult
 */
- (AWSTask<AWSSQSReceiveMessageResult *> *)receiveMessage:(AWSSQSReceiveMessageRequest *)request;

/**
 <p>Retrieves one or more messages, with a maximum limit of 10 messages, from the specified queue. Long poll support is enabled by using the <code>WaitTimeSeconds</code> parameter. For more information, see <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-long-polling.html">Amazon SQS Long Poll</a> in the <i>Amazon SQS Developer Guide</i>. </p><p> Short poll is the default behavior where a weighted random set of machines is sampled on a <code>ReceiveMessage</code> 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 <code>ReceiveMessage</code> call. If the number of messages in the queue is extremely small, you might not receive any messages in a particular <code>ReceiveMessage</code> response; in which case you should repeat the request. </p><p>For each message returned, the response includes the following:</p><ul><li><p>Message body</p></li><li><p> MD5 digest of the message body. For information about MD5, see <a href="https://www.ietf.org/rfc/rfc1321.txt">RFC1321</a>. </p></li><li><p>Message ID you received when you sent the message to the queue.</p></li><li><p>Receipt handle.</p></li><li><p>Message attributes.</p></li><li><p>MD5 digest of the message attributes.</p></li></ul><p> The receipt handle is the identifier you must provide when deleting the message. For more information, see <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/ImportantIdentifiers.html">Queue and Message Identifiers</a> in the <i>Amazon SQS Developer Guide</i>. </p><p> You can provide the <code>VisibilityTimeout</code> parameter in your request, which will be applied to the messages that Amazon SQS returns in the response. If you don't include the parameter, the overall visibility timeout for the queue is used for the returned messages. For more information, see <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/AboutVT.html">Visibility Timeout</a> in the <i>Amazon SQS Developer Guide</i>. </p><p> A message that is not deleted or a message whose visibility is not extended before the visibility timeout expires counts as a failed receive. Depending on the configuration of the queue, the message might be sent to the dead letter queue. </p><note><p>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.</p></note>
 
 @param request A container for the necessary parameters to execute the ReceiveMessage service method.
 @param completionHandler The completion handler to call when the load request is complete.
                          `response` - A response object, or `nil` if the request failed.
                          `error` - An error object that indicates why the request failed, or `nil` if the request was successful. On failed execution, `error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorOverLimit`.
 
 @see AWSSQSReceiveMessageRequest
 @see AWSSQSReceiveMessageResult
 */
- (void)receiveMessage:(AWSSQSReceiveMessageRequest *)request completionHandler:(void (^ _Nullable)(AWSSQSReceiveMessageResult * _Nullable response, NSError * _Nullable error))completionHandler;

/**
 <p>Revokes any permissions in the queue policy that matches the specified <code>Label</code> parameter. Only the owner of the queue can remove permissions.</p>
 
 @param request A container for the necessary parameters to execute the RemovePermission service method.

 @return An instance of `AWSTask`. On successful execution, `task.result` will be `nil`.
 
 @see AWSSQSRemovePermissionRequest
 */
- (AWSTask *)removePermission:(AWSSQSRemovePermissionRequest *)request;

/**
 <p>Revokes any permissions in the queue policy that matches the specified <code>Label</code> parameter. Only the owner of the queue can remove permissions.</p>
 
 @param request A container for the necessary parameters to execute the RemovePermission service method.
 @param completionHandler The completion handler to call when the load request is complete.
                          `error` - An error object that indicates why the request failed, or `nil` if the request was successful.
 
 @see AWSSQSRemovePermissionRequest
 */
- (void)removePermission:(AWSSQSRemovePermissionRequest *)request completionHandler:(void (^ _Nullable)(NSError * _Nullable error))completionHandler;

/**
 <p>Delivers a message to the specified queue.</p><important><p>The following list shows the characters (in Unicode) that are allowed in your message, according to the W3C XML specification:</p><p><code>#x9</code> | <code>#xA</code> | <code>#xD</code> | [<code>#x20</code> to <code>#xD7FF</code>] | [<code>#xE000</code> to <code>#xFFFD</code>] | [<code>#x10000</code> to <code>#x10FFFF</code>]</p><p>For more information, see <a href="https://www.ietf.org/rfc/rfc1321.txt">RFC1321</a>. If you send any characters that aren't included in this list, your request will be rejected.</p></important>
 
 @param request A container for the necessary parameters to execute the SendMessage service method.

 @return An instance of `AWSTask`. On successful execution, `task.result` will contain an instance of `AWSSQSSendMessageResult`. On failed execution, `task.error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorInvalidMessageContents`, `AWSSQSErrorUnsupportedOperation`.
 
 @see AWSSQSSendMessageRequest
 @see AWSSQSSendMessageResult
 */
- (AWSTask<AWSSQSSendMessageResult *> *)sendMessage:(AWSSQSSendMessageRequest *)request;

/**
 <p>Delivers a message to the specified queue.</p><important><p>The following list shows the characters (in Unicode) that are allowed in your message, according to the W3C XML specification:</p><p><code>#x9</code> | <code>#xA</code> | <code>#xD</code> | [<code>#x20</code> to <code>#xD7FF</code>] | [<code>#xE000</code> to <code>#xFFFD</code>] | [<code>#x10000</code> to <code>#x10FFFF</code>]</p><p>For more information, see <a href="https://www.ietf.org/rfc/rfc1321.txt">RFC1321</a>. If you send any characters that aren't included in this list, your request will be rejected.</p></important>
 
 @param request A container for the necessary parameters to execute the SendMessage service method.
 @param completionHandler The completion handler to call when the load request is complete.
                          `response` - A response object, or `nil` if the request failed.
                          `error` - An error object that indicates why the request failed, or `nil` if the request was successful. On failed execution, `error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorInvalidMessageContents`, `AWSSQSErrorUnsupportedOperation`.
 
 @see AWSSQSSendMessageRequest
 @see AWSSQSSendMessageResult
 */
- (void)sendMessage:(AWSSQSSendMessageRequest *)request completionHandler:(void (^ _Nullable)(AWSSQSSendMessageResult * _Nullable response, NSError * _Nullable error))completionHandler;

/**
 <p>Delivers up to ten messages to the specified queue. This is a batch version of <code><a>SendMessage</a></code>. For a FIFO queue, multiple messages within a single batch are enqueued in the order they are sent.</p><p>The result of sending each message is reported individually in the response. 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.</p><p>The maximum allowed individual message size and the maximum total payload size (the sum of the individual lengths of all of the batched messages) are both 256 KB (262,144 bytes).</p><important><p>The following list shows the characters (in Unicode) that are allowed in your message, according to the W3C XML specification:</p><p><code>#x9</code> | <code>#xA</code> | <code>#xD</code> | [<code>#x20</code> to <code>#xD7FF</code>] | [<code>#xE000</code> to <code>#xFFFD</code>] | [<code>#x10000</code> to <code>#x10FFFF</code>]</p><p>For more information, see <a href="https://www.ietf.org/rfc/rfc1321.txt">RFC1321</a>. If you send any characters that aren't included in this list, your request will be rejected.</p></important><p>If you don't specify the <code>DelaySeconds</code> parameter for an entry, Amazon SQS uses the default for the queue.</p><note><p>Some API actions take lists of parameters. These lists are specified using the <code>param.n</code> notation. Values of <code>n</code> are integers starting from 1. For example, a parameter list with two elements looks like this: </p></note><p><code>&amp;amp;Attribute.1=this</code></p><p><code>&amp;amp;Attribute.2=that</code></p>
 
 @param request A container for the necessary parameters to execute the SendMessageBatch service method.

 @return An instance of `AWSTask`. On successful execution, `task.result` will contain an instance of `AWSSQSSendMessageBatchResult`. On failed execution, `task.error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorTooManyEntriesInBatchRequest`, `AWSSQSErrorEmptyBatchRequest`, `AWSSQSErrorBatchEntryIdsNotDistinct`, `AWSSQSErrorBatchRequestTooLong`, `AWSSQSErrorInvalidBatchEntryId`, `AWSSQSErrorUnsupportedOperation`.
 
 @see AWSSQSSendMessageBatchRequest
 @see AWSSQSSendMessageBatchResult
 */
- (AWSTask<AWSSQSSendMessageBatchResult *> *)sendMessageBatch:(AWSSQSSendMessageBatchRequest *)request;

/**
 <p>Delivers up to ten messages to the specified queue. This is a batch version of <code><a>SendMessage</a></code>. For a FIFO queue, multiple messages within a single batch are enqueued in the order they are sent.</p><p>The result of sending each message is reported individually in the response. 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.</p><p>The maximum allowed individual message size and the maximum total payload size (the sum of the individual lengths of all of the batched messages) are both 256 KB (262,144 bytes).</p><important><p>The following list shows the characters (in Unicode) that are allowed in your message, according to the W3C XML specification:</p><p><code>#x9</code> | <code>#xA</code> | <code>#xD</code> | [<code>#x20</code> to <code>#xD7FF</code>] | [<code>#xE000</code> to <code>#xFFFD</code>] | [<code>#x10000</code> to <code>#x10FFFF</code>]</p><p>For more information, see <a href="https://www.ietf.org/rfc/rfc1321.txt">RFC1321</a>. If you send any characters that aren't included in this list, your request will be rejected.</p></important><p>If you don't specify the <code>DelaySeconds</code> parameter for an entry, Amazon SQS uses the default for the queue.</p><note><p>Some API actions take lists of parameters. These lists are specified using the <code>param.n</code> notation. Values of <code>n</code> are integers starting from 1. For example, a parameter list with two elements looks like this: </p></note><p><code>&amp;amp;Attribute.1=this</code></p><p><code>&amp;amp;Attribute.2=that</code></p>
 
 @param request A container for the necessary parameters to execute the SendMessageBatch service method.
 @param completionHandler The completion handler to call when the load request is complete.
                          `response` - A response object, or `nil` if the request failed.
                          `error` - An error object that indicates why the request failed, or `nil` if the request was successful. On failed execution, `error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorTooManyEntriesInBatchRequest`, `AWSSQSErrorEmptyBatchRequest`, `AWSSQSErrorBatchEntryIdsNotDistinct`, `AWSSQSErrorBatchRequestTooLong`, `AWSSQSErrorInvalidBatchEntryId`, `AWSSQSErrorUnsupportedOperation`.
 
 @see AWSSQSSendMessageBatchRequest
 @see AWSSQSSendMessageBatchResult
 */
- (void)sendMessageBatch:(AWSSQSSendMessageBatchRequest *)request completionHandler:(void (^ _Nullable)(AWSSQSSendMessageBatchResult * _Nullable response, NSError * _Nullable error))completionHandler;

/**
 <p>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 <code>MessageRetentionPeriod</code> attribute can take up to 15 minutes.</p><note><p>In the future, new attributes might be added. When you write code that calls this action, we recommend structuring your code so that it can handle new attributes gracefully.</p></note>
 
 @param request A container for the necessary parameters to execute the SetQueueAttributes service method.

 @return An instance of `AWSTask`. On successful execution, `task.result` will be `nil`. On failed execution, `task.error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorInvalidAttributeName`.
 
 @see AWSSQSSetQueueAttributesRequest
 */
- (AWSTask *)setQueueAttributes:(AWSSQSSetQueueAttributesRequest *)request;

/**
 <p>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 <code>MessageRetentionPeriod</code> attribute can take up to 15 minutes.</p><note><p>In the future, new attributes might be added. When you write code that calls this action, we recommend structuring your code so that it can handle new attributes gracefully.</p></note>
 
 @param request A container for the necessary parameters to execute the SetQueueAttributes service method.
 @param completionHandler The completion handler to call when the load request is complete.
                          `error` - An error object that indicates why the request failed, or `nil` if the request was successful. On failed execution, `error` may contain an `NSError` with `AWSSQSErrorDomain` domain and the following error code: `AWSSQSErrorInvalidAttributeName`.
 
 @see AWSSQSSetQueueAttributesRequest
 */
- (void)setQueueAttributes:(AWSSQSSetQueueAttributesRequest *)request completionHandler:(void (^ _Nullable)(NSError * _Nullable error))completionHandler;

@end

NS_ASSUME_NONNULL_END
