close connection to data sink invoked at onClose() method of io.gearpump.streaming.task.Task
open connection to data sink invoked at onStart() method of io.gearpump.streaming.task.Task
open connection to data sink invoked at onStart() method of io.gearpump.streaming.task.Task
is the task context at runtime
write message into data sink invoked at onNext() method of io.gearpump.streaming.task.Task
write message into data sink invoked at onNext() method of io.gearpump.streaming.task.Task
wraps data to be written out
interface to implement custom data sink where result of a DAG is typically written
a DataSink could be a data store like HBase or simply a console
an example would be like
subclass is required to be serializable