/**
* Delete the entry from wall.
*
* @param followEntry
*/
public void deleteEntry(String username, String id) {
try {
// find name of super column using reverse mapping from id to time
UUID uuid = UUIDUtil.fromString(id);
final byte[] idAsBytes = UUIDUtil.toBytes(uuid);
byte[] timeUUIDAsBytes = getTimeUUIDFromID(username, idAsBytes);
if (timeUUIDAsBytes == null) {
throw new TrendOceanException("Can not find time uuid " + username + ":" + id);
}
// delete super column from wall cf
Mutator mutator = Pelops.createMutator(TRENDOCEAN_POOL, TRENDOCEAN_KEYSPACE);
mutator.deleteColumn(username, WALL_CF, timeUUIDAsBytes);
// also delete from reverse mapping from id to time
mutator.deleteColumn(username, ID_TO_TIMEUUID_CF, idAsBytes);
mutator.execute(ConsistencyLevel.QUORUM);
} catch (Exception ex) {
logger.error("Can not delete follow entry", username + ":" + id, ex);
throw new TrendOceanException(ex);
}
}
/** Add a new comment entry for a user. */
public void addNotification(
String username,
String relatedUser,
String questionId,
long answerCount,
NotificationType notificationType) {
try {
Mutator mutator = Pelops.createMutator(TRENDOCEAN_POOL, TRENDOCEAN_KEYSPACE);
byte[] timeUUIDBytes = UUIDUtil.toBytes(UUIDUtil.getTimeUUID());
UUID id = UUIDUtil.getRandomUUID();
byte[] idAsBytes = UUIDUtil.toBytes(id);
// add new notification
if (notificationType == NotificationType.COMMENT
|| notificationType == NotificationType.LIKE
|| notificationType == NotificationType.MENTION) {
mutator.writeSubColumns(
username,
WALL_CF,
timeUUIDBytes,
mutator.newColumnList(
mutator.newColumn("_id", idAsBytes),
mutator.newColumn("_type", toBytes(notificationType.getId())),
mutator.newColumn("questionId", toBytes(questionId)),
mutator.newColumn("relatedUser", relatedUser)));
} else if (notificationType == NotificationType.NEW_FOLLOWER
|| notificationType == NotificationType.FOLLOW_REQUEST_ACCEPT) {
mutator.writeSubColumns(
username,
WALL_CF,
timeUUIDBytes,
mutator.newColumnList(
mutator.newColumn("_id", idAsBytes),
mutator.newColumn("_type", toBytes(notificationType.getId())),
mutator.newColumn("relatedUser", relatedUser)));
} else if (notificationType == NotificationType.ANSWER_COUNT) {
mutator.writeSubColumns(
username,
WALL_CF,
timeUUIDBytes,
mutator.newColumnList(
mutator.newColumn("_id", idAsBytes),
mutator.newColumn("_type", toBytes(notificationType.getId())),
mutator.newColumn("questionId", toBytes(questionId)),
mutator.newColumn("answerCount", toBytes(answerCount))));
}
// write reverse mapping for delete
mutator.writeColumn(username, ID_TO_TIMEUUID_CF, mutator.newColumn(idAsBytes, timeUUIDBytes));
mutator.execute(ConsistencyLevel.QUORUM);
} catch (Exception ex) {
logger.error("Can not add follow entry", username + ":" + questionId, ex);
throw new TrendOceanException(ex);
}
}