Set an Amazon SNS filter policy using an Amazon SDK
The following code examples show how to set an Amazon SNS filter policy.
- Java
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- SDK for Java 2.x
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Note
There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository
. public static void usePolicy(SnsClient snsClient, String subscriptionArn) { try { SNSMessageFilterPolicy fp = new SNSMessageFilterPolicy(); // Add a filter policy attribute with a single value fp.addAttribute("store", "example_corp"); fp.addAttribute("event", "order_placed"); // Add a prefix attribute fp.addAttributePrefix("customer_interests", "bas"); // Add an anything-but attribute fp.addAttributeAnythingBut("customer_interests", "baseball"); // Add a filter policy attribute with a list of values ArrayList<String> attributeValues = new ArrayList<>(); attributeValues.add("rugby"); attributeValues.add("soccer"); attributeValues.add("hockey"); fp.addAttribute("customer_interests", attributeValues); // Add a numeric attribute fp.addAttribute("price_usd", "=", 0); // Add a numeric attribute with a range fp.addAttributeRange("price_usd", ">", 0, "<=", 100); // Apply the filter policy attributes to an Amazon SNS subscription fp.apply(snsClient, subscriptionArn); } catch (SnsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } }
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For API details, see SetSubscriptionAttributes in Amazon SDK for Java 2.x API Reference.
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- Python
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- SDK for Python (Boto3)
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Note
There's more on GitHub. Find the complete example and learn how to set up and run in the Amazon Code Examples Repository
. class SnsWrapper: """Encapsulates Amazon SNS topic and subscription functions.""" def __init__(self, sns_resource): """ :param sns_resource: A Boto3 Amazon SNS resource. """ self.sns_resource = sns_resource @staticmethod def add_subscription_filter(subscription, attributes): """ Adds a filter policy to a subscription. A filter policy is a key and a list of values that are allowed. When a message is published, it must have an attribute that passes the filter or it will not be sent to the subscription. :param subscription: The subscription the filter policy is attached to. :param attributes: A dictionary of key-value pairs that define the filter. """ try: att_policy = {key: [value] for key, value in attributes.items()} subscription.set_attributes( AttributeName='FilterPolicy', AttributeValue=json.dumps(att_policy)) logger.info("Added filter to subscription %s.", subscription.arn) except ClientError: logger.exception( "Couldn't add filter to subscription %s.", subscription.arn) raise
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For API details, see SetSubscriptionAttributes in Amazon SDK for Python (Boto3) API Reference.
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For a complete list of Amazon SDK developer guides and code examples, see Using Amazon SNS with an Amazon SDK. This topic also includes information about getting started and details about previous SDK versions.