CmbComposite columnName = cassandraHandler.getCmbComposite(endpoint, protocol.name());
CmbColumn<CmbComposite, String> column = cassandraHandler.readColumn(AbstractDurablePersistence.CNS_KEYSPACE, columnFamilySubscriptions, Util.getCnsTopicArn(arn), columnName, CMB_SERIALIZER.STRING_SERIALIZER, CMB_SERIALIZER.COMPOSITE_SERIALIZER, CMB_SERIALIZER.STRING_SERIALIZER);
if (column != null) {
CNSSubscription s = extractSubscriptionFromColumn(column, Util.getCnsTopicArn(arn));
s.checkIsValid();
return s;
}
}
return null;