/**
* Subscribes to a given Amazon SNS topic.
*
* @param topic topic to subscribe to
*/
public void subscribeToTopic(final SnsTopic topic) {
final SubscribeRequest request = new SubscribeRequest();
request.setEndpoint(endpointArn);
request.setTopicArn(topic.getTopicArn());
request.setProtocol(SNS_PROTOCOL_APPLICATION);
final SubscribeResult result = sns.subscribe(request);
// update topic and save subscription in shared preferences
final String subscriptionArn = result.getSubscriptionArn();
topic.setSubscriptionArn(subscriptionArn);
sharedPreferences.edit().putString(topic.getTopicArn(), subscriptionArn).commit();
}
/**
* Unsubscribes from a given Amazon SNS topic.
*
* @param topic topic to unsubscribe from
*/
public void unsubscribeFromTopic(final SnsTopic topic) {
// Rely on the status stored locally even though it's likely that the device is
// subscribed to a topic, but the subscription arn is lost, say due to clearing app data.
if (!topic.isSubscribed()) {
return;
}
final UnsubscribeRequest request = new UnsubscribeRequest();
request.setSubscriptionArn(topic.getSubscriptionArn());
sns.unsubscribe(request);
// update topic and save subscription in shared preferences
topic.setSubscriptionArn("");
sharedPreferences.edit().putString(topic.getTopicArn(), "").commit();
}
