Stream
A stream passes one component’s output to one or more other components. For example, a simple flow that only writes to a file might have this sequence:
source > stream1 > queryA > stream2 > FileWriter
This more complex flow branches at stream2 in order to send alerts and populate the dashboard:
source > stream1 > queryA > stream2 > ... ... stream2 > queryB > stream3 > Subscription ... stream2 > queryC > WActionStore