The new Oracle Stream Explorer provides us with a [business]user friendly facility to process real time events. Through visually appealing and functionally intuitive web wizards, Stream Explorer has us construct explorations that consume events from streams, process these events through filtering, aggregation, pattern matching and enriching and deliver these events to downstream destinations.
Using Stream Explorer, we can tap into streams of events – frequently JMS messages and alternatively HTTP PUB/SUB, SOA Suite EDN events or REST calls. For testing and demo purposes, we can use an CSV file as the source for a stream exploration. A stream is fed into one or more explorations that do the interpretation and processing of the events. A target can be associated with an exploration to have the outcomes of the exploration – which are also events, at a more elevated level after all the processing has taken place – delivered for subsequent action or communication. Destination types available for targets are JMS, REST Service, HTTP Pub (channel) and the EDN of SOA Suite. Again, for development, testing and demonstrations, a CSV file can be set as the target.
In this first introduction to Stream Explorer, we will discuss a very simple challenge: we are organizing a small conference. In three rooms, sessions take place simultaneously. Our attendees are free to decide which session to attend. We would like to know at virtually any moment how many people are in each room. We have set up simple detectors at the doors of the rooms that produce a signal whenever someone enters or leaves the room. This signal consists of the room identifier (1,2 or 3) and an IN/OUT flag (values +1 or -1).
We will use Stream Explorer to process these events and produce an aggregate per room of the net number of people that entered or left the room. In subsequent articles we will do more advanced explorations in this same setting – looking at prematurely concluded sessions, jammed doors, overflowing rooms etc.
Preparation
The preparation consists of the installation of Stream Explorer on top of an OEP domain. Start the OEP Server. The Stream Explorer can be accessed at http://host:port/sx. Login using the same user used for the OEP Events Visualizer web application: wlevs. Read the complete article here.
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For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center.
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