Finally I got it working...
Below are the code snippet which will be useful for trigger users,
public Collection<RowMutation> augment(ByteBuffer key, ColumnFamily cf) {
try {
ByteBuffer id_bb = CompositeType.extractComponent(key, 0);
UUID id=TimeUUIDType.instance.compose(id_bb);
ByteBuffer data_key_bb = CompositeType.extractComponent(key, 1);
String data_key=UTF8Type.instance.compose(data_key_bb);
Iterator col_itr=cf.iterator();
Column ts_col=(Column)col_itr.next();
ByteBuffer time_bb=CompositeType.extractComponent(ts_col.name(),0);
long time=(TimestampType.instance.compose(time_bb)).getTime();
Column data_bb=(Column)col_itr.next();
String data=UTF8Type.instance.compose(data_bb.value());
log(" id --> "+id.toString());
log(" data_key-->"+data_key);
log(" time == "+time);
log(" data == "+data);
} catch (Exception e) {
logger.warn("Exception ", e);
}
return null;
}
PS: Since I know my table format, I hardcoded the column comparator type.
If we want to write generic trigger code, we can use
cf.getComponentComparator()/getKeyValidator().
- Ramesh
On Wed, Nov 27, 2013 at 5:10 PM, J Ramesh Kumar <rameshj1...@gmail.com>wrote:
> Hi,
>
> I need your help on extract column names and values in the trigger augment
> method.
>
> *Table Def :*
>
> create table dy_data (
> id timeuuid,
> data_key text,
> time timestamp,
> data text,
> primary key((id,data_key),time)) with clustering order by (time desc);
>
> public class ArchiveTrigger implements ITrigger {
> public Collection<RowMutation> augment(ByteBuffer key, ColumnFamily cf) {
> try {
> *// Below loop only has 2 columns ( one is "data" and another
> one may be "time" but i am not sure, because i cannot get value. *
>
> for (Column cell : cf) {
> * //Got Exception if I try to get column name*
> String name = ByteBufferUtil.string(cell.name());
> * //Got only "data" column value and empty value for
> another column may be "time"*. *If I try
> ByteBufferUtil.toLong(cell.value()) it throws exception*
> String value = ByteBufferUtil.string(cell.value());
> log(" name = " + name);
> log(" value = " + value);
> }
> } catch (Exception e) {
> logger.warn("Exception ", e);
> }
> return null;
> }
> }
>
>
> I tried my best to search sample code in google. But failed. Please help
> me with sample code.
>
> Thanks in advance.
>
> Regards,
> Ramesh
>
