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   * Copyright 2013-2015, 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
  * or in the "license" file accompanying this file. This file is distributed
  * express or implied. See the License for the specific language governing
  * permissions and limitations under the License.
 import java.util.Map;
Set of utility methods for working with Amazon SNS topics.
 public class Topics {

Subscribes an existing Amazon SQS queue to an existing Amazon SNS topic.

The specified Amazon SNS client will be used to send the subscription request, and the Amazon SQS client will be used to modify the policy on the queue to allow it to receive messages from the SNS topic.

The policy applied to the SQS queue is similar to this:

    "Version" : "2008-10-17",
    "Statement" : [{
       "Sid" : "topic-subscription-arn:aws:sns:us-west-2:599109622955:myTopic",
       "Effect" : "Allow",
       "Principal" : {
       "Action" : ["sqs:SendMessage"],
       "Condition" : {

IMPORTANT: If there is already an existing policy set for the specified SQS queue, this operation will overwrite it with a new policy that allows the SNS topic to deliver messages to the queue.

IMPORTANT: There might be a small time period immediately after subscribing the SQS queue to the SNS topic and updating the SQS queue's policy, where messages are not able to be delivered to the queue. After a moment, the new queue policy will propagate and the queue will be able to receive messages. This delay only occurs immediately after initially subscribing the queue.

IMPORTANT: The specified queue and topic (as well as the SNS and SQS client) should both be located in the same AWS region.

sns The Amazon SNS client to use when subscribing the queue to the topic.
sqs The Amazon SQS client to use when applying the policy to allow subscribing to the topic.
snsTopicArn The Amazon Resource Name (ARN) uniquely identifying the Amazon SNS topic. This value is returned form Amazon SNS when creating the topic.
sqsQueueUrl The URL uniquely identifying the Amazon SQS queue. This value is returned from Amazon SQS when creating the queue.
The subscription ARN as returned by Amazon SNS when the queue is successfully subscribed to the topic.
com.amazonaws.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.
com.amazonaws.AmazonServiceException If an error response is returned by AmazonSNS indicating either a problem with the data in the request, or a server side issue.
    public static String subscribeQueue(AmazonSNS snsAmazonSQS sqsString snsTopicArnString sqsQueueUrl)
                throws AmazonClientExceptionAmazonServiceException {
        Map<StringStringqueueAttributes = sqs.getQueueAttributes(new GetQueueAttributesRequest(sqsQueueUrl)
        String sqsQueueArn = queueAttributes.get(..toString());
        Policy policy = new Policy().withStatements(
                new Statement(.)
                    .withId("topic-subscription-" + snsTopicArn)
                    .withResources(new Resource(sqsQueueArn))
        ..println("Policy: " + policy.toJson());
        queueAttributes = new HashMap<StringString>();
        queueAttributes.put(..toString(), policy.toJson());
        sqs.setQueueAttributes(new SetQueueAttributesRequest(sqsQueueUrlqueueAttributes));
        SubscribeResult subscribeResult =
                sns.subscribe(new SubscribeRequest()
        return subscribeResult.getSubscriptionArn();
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