public static List<String> getDestinationQueueNamesFromCounterColumns(
String columnFamilyName, String rowName, Keyspace keyspace)
throws CassandraDataAccessException {
ArrayList<String> rowList = new ArrayList<String>();
if (keyspace == null) {
throw new CassandraDataAccessException("Can't access Data , no keyspace provided ");
}
if (columnFamilyName == null || rowName == null) {
throw new CassandraDataAccessException(
"Can't access data with columnFamily =" + columnFamilyName + " and rowName=" + rowName);
}
try {
SliceCounterQuery<String, String> sliceQuery =
HFactory.createCounterSliceQuery(keyspace, stringSerializer, stringSerializer);
sliceQuery.setKey(rowName);
sliceQuery.setColumnFamily(columnFamilyName);
sliceQuery.setRange("", "", false, Integer.MAX_VALUE);
QueryResult<CounterSlice<String>> result = sliceQuery.execute();
CounterSlice<String> columnSlice = result.get();
for (HCounterColumn<String> column : columnSlice.getColumns()) {
rowList.add(column.getName());
}
} catch (Exception e) {
throw new CassandraDataAccessException(
"Error while accessing data from :" + columnFamilyName, e);
}
return rowList;
}
/**
* @param keyspace name of key space
* @param columnFamily column family name
* @param key key value
* @param cloumnName column name
* @return long count value
* @throws CassandraDataAccessException
*/
public static long getCountValue(
Keyspace keyspace, String columnFamily, String cloumnName, String key)
throws CassandraDataAccessException {
try {
CounterQuery<String, String> query =
HFactory.createCounterColumnQuery(keyspace, stringSerializer, stringSerializer);
query.setColumnFamily(columnFamily).setKey(key).setName(cloumnName);
HCounterColumn<String> counter = query.execute().get();
return counter.getValue();
} catch (Exception e) {
throw new CassandraDataAccessException("Error while accessing:" + columnFamily, e);
}
}