fork/join in activemq?

[Li Li]

is it possible to implement fork and join pattern in activemq? in
request/reply scenario, one request may product more than one message,
so complete response is the aggregation of many individual response.
Also, we have to deal with timeout of some response and aggregate
partial responses.
e.g.
  RequestHandler:
     split a task into many subtasks
     send these tasks to working queue
     waiting all the subtasks to complete or timeout
     merge solution of subtasks to a complete solution.