Describes architectural patterns for real-time systems. Accompanies YouTube video at: https://youtu.be/OmRVgmVgt4Y

1. Architectural Patterns for Real-time
Systems
Software Engineering 10

2. Architectural patterns
Stereotypical ways of organizing the
architecture of a particular type of
software system

3. Observe and React
Environmental Control
Process Pipeline

4. Observe and React
This pattern is used when a set of
sensors are routinely monitored and
displayed.
.

5. Environmental Control
This pattern is used when a system
includes sensors, which provide
information about the environment
and actuators that can change the
environment
.

6. Process Pipeline
This pattern is used when data has
to be transformed from one
representation to another before it
can be processed.

7. Observe and react
The input values of a set of sensors of the same types are
collected and analyzed. These values are displayed in some
way.
If the sensor values indicate that some exceptional
condition has arisen, then actions are initiated to draw the
operator’s attention to that value and, in certain cases, to
take actions in response to the exceptional value.

8. Real-time systems architectures are
process architectures
The system is composed of a
number of concurrent processes

9. Observe and React process structure

10. Burglar alarm system

11. Environmental control
The system analyzes information from a
set of sensors that collect data from the
system’s environment. Further
information may also be collected on the
state of the actuators that are connected
to the system.

12. Based on the data from the sensors
and actuators, control signals are
sent to the actuators that then cause
changes to the system’s
environment.

13. Information about the sensor values
and the state of the actuators may be
displayed.

14. Environmental control

15. Anti-skid braking system

16. Process pipeline
An architecture for rapid data
collection that collects data from
sensors for later processing.

17. The end of the pipeline is a process
that transforms the data into a
representation that can be stored
and further processed.

18. Process Pipeline process structure

19. If the producer process runs faster
than the consumer process, a large
intermediate buffer is required

20. Neutron flux data acquisition
04/12/2014 Chapter 21. Real-time 20

21. Hybrid patterns
Large real-time systems often use a
combination of these patterns in different
parts of the system

22. For example, Process Pipeline could
be used to collect sensor information
for Observe and React pattern

23. Observe and React
Environmental Control
Process Pipeline