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;
}
public void removeCounterRow(K key) {
SliceCounterQuery<K, N> query =
HFactory.createCounterSliceQuery(keyspace, keySerializer, columnNameSerializer)
.setColumnFamily(columnFamily)
.setKey(key);
AchillesCounterSliceIterator<K, N> iterator =
new AchillesCounterSliceIterator<K, N>(
policy, columnFamily, query, (N) null, (N) null, false, DEFAULT_LENGTH);
Mutator<K> mutator = HFactory.createMutator(keyspace, keySerializer);
while (iterator.hasNext()) {
HCounterColumn<N> counterCol = iterator.next();
mutator.decrementCounter(key, columnFamily, counterCol.getName(), counterCol.getValue());
}
this.executeMutator(mutator);
}
public List<HCounterColumn<N>> findCounterColumnsRange(
K key, N startName, N endName, int count, boolean reverse) {
this.policy.loadConsistencyLevelForRead(columnFamily);
List<HCounterColumn<N>> result;
try {
result =
HFactory.createCounterSliceQuery(keyspace, keySerializer, columnNameSerializer)
.setColumnFamily(columnFamily)
.setKey(key)
.setRange(startName, endName, reverse, count)
.execute()
.get()
.getColumns();
} catch (Throwable throwable) {
throw new RuntimeException(throwable);
} finally {
this.policy.reinitDefaultConsistencyLevel();
}
return result;
}
