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8.7. AWS-SQS

SQS Component
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Available as of Camel 2.6
The sqs component supports sending and receiving messages to Amazon's SQS service.
Prerequisites
You must have a valid Amazon Web Services developer account, and be signed up to use Amazon SQS. More information are available at Amazon SQS.

URI Format
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aws-sqs://queue-name[?options]
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The queue will be created if they don't already exists. You can append query options to the URI in the following format, ?options=value&option2=value&...

URI Options
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Name Default Value Context Description
amazonSQSClient null Shared Reference to a com.amazonaws.services.sqs.AmazonSQSClient in the Registry.
accessKey null Shared Amazon AWS Access Key
secretKey null Shared Amazon AWS Secret Key
amazonSQSEndpoint null Shared The region with which the AWS-SQS client wants to work with.
attributeNames null Consumer A list of attributes to set in the com.amazonaws.services.sqs.model.ReceiveMessageRequest.
defaultVisibilityTimeout null Shared The visibility timeout (in seconds) to set in the com.amazonaws.services.sqs.model.CreateQueueRequest.
deleteAfterRead true Consumer Delete message from SQS after it has been read
maxMessagesPerPoll null Consumer The maximum number of messages which can be received in one poll to set in the com.amazonaws.services.sqs.model.ReceiveMessageRequest.
visibilityTimeout null Shared The duration (in seconds) that the received messages are hidden from subsequent retrieve requests after being retrieved by a ReceiveMessage request to set in the com.amazonaws.services.sqs.model.SetQueueAttributesRequest. This only make sense if its different from defaultVisibilityTimeout. It changes the queue visibility timeout attribute permanently.
messageVisibilityTimeout null Consumer Camel 2.8: The duration (in seconds) that the received messages are hidden from subsequent retrieve requests after being retrieved by a ReceiveMessage request to set in the com.amazonaws.services.sqs.model.ReceiveMessageRequest. It does NOT change the queue visibility timeout attribute permanently.
extendMessageVisibility false Consumer *Camel 2.10:* If enabled then a scheduled background task will keep extending the message visibility on SQS. This is needed if it taks a long time to process the message. See details at Amazon docs.
maximumMessageSize null Shared Camel 2.8: The maximumMessageSize (in bytes) an SQS message can contain for this queue, to set in the com.amazonaws.services.sqs.model.SetQueueAttributesRequest.
messageRetentionPeriod null Shared Camel 2.8: The messageRetentionPeriod (in seconds) a message will be retained by SQS for this queue, to set in the com.amazonaws.services.sqs.model.SetQueueAttributesRequest.
policy null Shared Camel 2.8: The policy for this queue to set in the com.amazonaws.services.sqs.model.SetQueueAttributesRequest.
delaySeconds null Producer *Camel 2.9.3:* Delay sending messages for a number of seconds.
Required SQS component options
You have to provide the amazonSQSClient in the Registry or your accessKey and secretKey to access the Amazon's SQS.

Batch Consumer
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This component implements the Batch Consumer.
This allows you for instance to know how many messages exists in this batch and for instance let the Aggregator aggregate this number of messages.

Usage
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Message headers set by the SQS producer
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Header Type Description
CamelAwsSqsMD5OfBody String The MD5 checksum of the Amazon SQS message.
CamelAwsSqsMessageId String The Amazon SQS message ID.

Message headers set by the SQS consumer
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Header Type Description
CamelAwsSqsMD5OfBody String The MD5 checksum of the Amazon SQS message.
CamelAwsSqsMessageId String The Amazon SQS message ID.
CamelAwsSqsReceiptHandle String The Amazon SQS message receipt handle.
CamelAwsSqsAttributes Map<String, String> The Amazon SQS message attributes.

Advanced AmazonSQSClient configuration
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If your Camel Application is running behind a firewall or if you need to have more control over the AmazonSQSClient configuration, you can create your own instance: 
AWSCredentials awsCredentials = new BasicAWSCredentials("myAccessKey", "mySecretKey");

ClientConfiguration clientConfiguration = new ClientConfiguration();
clientConfiguration.setProxyHost("http://myProxyHost");
clientConfiguration.setProxyPort(8080);

AmazonSQSClient client = new AmazonSQSClient(awsCredentials, clientConfiguration);
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and refer to it in your Camel aws-sqs component configuration: 
from("aws-sqs://MyQueue?amazonSQSClient=#amazonSQSClient&delay=5000&maxMessagesPerPoll=5")
.to("mock:result");
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Dependencies
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Maven users will need to add the following dependency to their pom.xml.
pom.xml
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-aws</artifactId>
    <version>${camel-version}</version>
</dependency>
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where $\{camel-version\} must be replaced by the actual version of Camel (2.6 or higher).
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