@Override
public CNSSubscription getSubscription(String arn) throws Exception {
// read form index to get composite col-name
CmbColumnSlice<String, String> slice =
cassandraHandler.readColumnSlice(
AbstractDurablePersistence.CNS_KEYSPACE,
columnFamilySubscriptionsIndex,
arn,
null,
null,
1,
CMB_SERIALIZER.STRING_SERIALIZER,
CMB_SERIALIZER.STRING_SERIALIZER,
CMB_SERIALIZER.STRING_SERIALIZER);
if (slice != null) {
// get Column from main table
String colName = slice.getColumns().get(0).getName();
CnsSubscriptionProtocol protocol = getEndpointAndProtoIndexValProtocol(colName);
String endpoint = getEndpointAndProtoIndexValEndpoint(colName);
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;
}
/**
* Enumerate all subs in a topic
*
* @param nextToken The ARN of the last sub-returned or null is first time call.
* @param topicArn
* @param protocol
* @param pageSize
* @param hidePendingArn
* @return The list of subscriptions given a topic. Note: if nextToken is provided, the returned
* list will not contain it for convenience
* @throws Exception
*/
public List<CNSSubscription> listSubscriptionsByTopic(
String nextToken,
String topicArn,
CnsSubscriptionProtocol protocol,
int pageSize,
boolean hidePendingArn)
throws Exception {
if (nextToken != null) {
if (getSubscription(nextToken) == null) {
throw new SubscriberNotFoundException("Subscriber not found for arn " + nextToken);
}
}
// read from index to get composite-col-name corresponding to nextToken
CmbComposite nextTokenComposite = null;
if (nextToken != null) {
CmbColumnSlice<String, String> slice =
cassandraHandler.readColumnSlice(
AbstractDurablePersistence.CNS_KEYSPACE,
columnFamilySubscriptionsIndex,
nextToken,
null,
null,
1,
CMB_SERIALIZER.STRING_SERIALIZER,
CMB_SERIALIZER.STRING_SERIALIZER,
CMB_SERIALIZER.STRING_SERIALIZER);
if (slice == null) {
throw new IllegalArgumentException("Could not find any subscription with arn " + nextToken);
}
// get Column from main table
String colName = slice.getColumns().get(0).getName();
CnsSubscriptionProtocol tokProtocol = getEndpointAndProtoIndexValProtocol(colName);
String endpoint = getEndpointAndProtoIndexValEndpoint(colName);
nextTokenComposite = cassandraHandler.getCmbComposite(endpoint, tokProtocol.name());
}
List<CNSSubscription> l = new ArrayList<CNSSubscription>();
CNSTopic t = PersistenceFactory.getTopicPersistence().getTopic(topicArn);
if (t == null) {
throw new TopicNotFoundException("Resource not found.");
}
// read pageSize at a time
CmbColumnSlice<CmbComposite, String> cols =
cassandraHandler.readColumnSlice(
AbstractDurablePersistence.CNS_KEYSPACE,
columnFamilySubscriptions,
topicArn,
nextTokenComposite,
null,
pageSize,
CMB_SERIALIZER.STRING_SERIALIZER,
CMB_SERIALIZER.COMPOSITE_SERIALIZER,
CMB_SERIALIZER.STRING_SERIALIZER);
if (nextToken != null && cols.size() > 0) {
cols.getColumns().remove(0);
}
while (l.size() < pageSize) {
if (cols == null || cols.size() == 0) {
return l;
}
for (CmbColumn<CmbComposite, String> col : cols.getColumns()) {
CNSSubscription sub = extractSubscriptionFromColumn(col, topicArn);
// ignore invalid subscriptions coming from Cassandra
try {
sub.checkIsValid();
} catch (CMBException ex) {
logger.error("event=invalid_subscription " + sub.toString(), ex);
continue;
}
if (protocol != null && protocol != sub.getProtocol()) {
continue;
}
if (hidePendingArn) {
if (sub.isConfirmed()) {
l.add(sub);
} else {
sub.setArn("PendingConfirmation");
l.add(sub);
}
} else {
l.add(sub);
}
if (l.size() == pageSize) {
return l;
}
}
nextTokenComposite = cols.getColumns().get(cols.size() - 1).getName();
cols =
cassandraHandler.readColumnSlice(
AbstractDurablePersistence.CNS_KEYSPACE,
columnFamilySubscriptions,
topicArn,
nextTokenComposite,
null,
pageSize,
CMB_SERIALIZER.STRING_SERIALIZER,
CMB_SERIALIZER.COMPOSITE_SERIALIZER,
CMB_SERIALIZER.STRING_SERIALIZER);
if (cols.size() > 0) {
cols.getColumns().remove(0);
}
}
return l;
}
private static String getEndpointAndProtoIndexVal(
String endpoint, CnsSubscriptionProtocol protocol) {
return protocol.name() + ":" + endpoint;
}