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Copyright © 2001Page 1 11-6-2015 Real-Time Java Fact-no-fiction Java in technical automation Paul Wijntjes Consultant Turnkiek Technical Systems.

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Presentation on theme: "Copyright © 2001Page 1 11-6-2015 Real-Time Java Fact-no-fiction Java in technical automation Paul Wijntjes Consultant Turnkiek Technical Systems."— Presentation transcript:

1 Copyright © 2001Page 1 11-6-2015 Real-Time Java Fact-no-fiction Java in technical automation Paul Wijntjes Consultant Turnkiek Technical Systems

2 11-6-2015 Copyright © 2001Page 2 Contents Introduction Java in embedded Real Time Java Demonstrator

3 11-6-2015 Copyright © 2001Page 3 Offices in: Amersfoort Delft Eindhoven

4 11-6-2015 Copyright © 2001Page 4 nEarly adopter nQuality solutions nCost effective and future aimed nIn technical industrial & scientific market nReliable and valued partner Give the customer peace of mind Commitment = commitment Small things matter Treat and respect people as people Mission statement: Inproduct sw V&S systemen Prod. Autom. Network Comp R &D Traffic & Transport Productie Bdr. Defense Advanced machines Utilities Telecom Java Embedded Microsoft Unix /Linux Platforms Service areas. Market segments

5 11-6-2015 Copyright © 2001Page 5 Contents Introduction Java in embedded Real Time Java Demonstrator

6 11-6-2015 Copyright © 2001Page 6 Not only people YEAR 2010 Number of subscribers/units (millions) People Automobiles Bicycle Portable PCs Motorcycles, Boats, Vending Machines etc Pets (dogs and cats etc) Total 120 100 60 50 10 20 360 Forecast by DoCoMo based on “Trends in Household Consumption” by Economic Planning Agency, and published materials by Japan Pet Food Manufacturer’s Association etc

7 11-6-2015 Copyright © 2001Page 7 Pro File Pro File JavaTM 2 Platform Hardware / Operating System Java Virtual Machine J2EE APIs J2SE APIs J2ME APIs Pro File Pro File Pro File Pro File Pro File Pro File Pro File Pro File Pro File Pro File Pro File Pro File Pro File Pro File Pro File Pro File Profiles Configu- rations ??? Thanks to Chris Laffra, OTI

8 11-6-2015 Copyright © 2001Page 8 Why Java in Embedded ? More reliable More productive - O bject oriented - High level - C omponent model Inherent networking Less porting effort (if any) Machine code skills deteriorating Descartes

9 11-6-2015 Copyright © 2001Page 9 Evolution -> Revolution SE EE ME -2 y now +2 y

10 11-6-2015 Copyright © 2001Page 10 Contents Introduction Java in embedded Real Time Java Demonstrator

11 11-6-2015 Copyright © 2001Page 11 Yes, but…… What about Real-Time?

12 11-6-2015 Copyright © 2001Page 12 Specification J-Consortium, RTJWG - NewMonics, HP, Microsoft, Aonix,... JCP, JSR-0000001 - Specs - Reference implementation - Test suite - Expected Q4-2001

13 11-6-2015 Copyright © 2001Page 13 Guiding Principles Applicability to particular Java environments Backward compatibility Write once, run anywhere Current practice versus advanced future features Predictable execution No syntactic extension

14 11-6-2015 Copyright © 2001Page 14 RTSJ: 8 modified areas 1. Thread scheduling and dispatching 2. Memory management 3. Synchronization and resource sharing 4. Physical memory access 5. Asynchronous event handling 6. Asynchronous transfer of control 7. Asynchronous thread termination 8. Exceptions

15 11-6-2015 Copyright © 2001Page 15 1. Thread scheduling and dispatching Introduction of class RealTimeThread Predictable execution Unanticipated scheduling algorithms can be used Preemptive, Priority-based, FIFO within priority with at least 28 unique priority levels

16 11-6-2015 Copyright © 2001Page 16 How does it work? Rt-thread Time Priority Java thread GC Rt-thread Pipe

17 11-6-2015 Copyright © 2001Page 17 2. Memory management Garbage collection Basic memory areas - Scoped memory - Physical memory - Immortal memory - Heap memory

18 11-6-2015 Copyright © 2001Page 18 3. Synchronisation and resource sharing Prevent priority inversion Monitor behavior policy can be set per object. Determinisme

19 11-6-2015 Copyright © 2001Page 19 Priority inheritance Object Thread 1 Thread 2 Lock Unlock Lock Priority Time

20 11-6-2015 Copyright © 2001Page 20 4. Physical memory access Byte-level access to physical memory Construction of objects in physical memory

21 11-6-2015 Copyright © 2001Page 21 5. Asynchronous event handling Two classes AsyncEvent  AsynchEventHandler Implemented scheduler for execution

22 11-6-2015 Copyright © 2001Page 22 AsyncEvent (how it works) AsyncEvent bindTo() abstract class AsyncEventHandler: run() // final handleAsyncEvent() getAndDecrementPendingFireCount() addHandler() Handler implements Schedulable and Runnable interfaces. Real world event

23 11-6-2015 Copyright © 2001Page 23 6. Asynchronous transfer of control (ATC) Execution transfer Time bound ATC and asynchronous event handling can be combined.

24 11-6-2015 Copyright © 2001Page 24 7. Asynchronous thread termination Safely transfer of control New mechanism for stopping threads

25 11-6-2015 Copyright © 2001Page 25 8. Exceptions New several exceptions New treatment of exceptions  asynchronous transfer of control  memory allocation

26 11-6-2015 Copyright © 2001Page 26 Implementations TimeSys, reference implementation JSR-1 OTI/IBM J9 Esmertec, JBed Insignia Solutions, Jeode aJile Systems

27 11-6-2015 Copyright © 2001Page 27 Contents Introduction Java in embedded Real Time Java Demonstrator

28 11-6-2015 Copyright © 2001Page 28 Real time demonstrator

29 11-6-2015 Copyright © 2001Page 29 PC 104 board QNX Neutrino OTI’s J9 + Real-Time Extensions Application Drivers motorcontrolers Architecture

30 11-6-2015 Copyright © 2001Page 30 Visual Age Micro Edition After running 3 threads “simultaneously” Trace analyzerMemory analyzer

31 11-6-2015 Copyright © 2001Page 31 Lessons learned Real-Time Java is Really Real-Time Implementation of specs not complete OTI’s J9 and VAME work very well

32 11-6-2015 Copyright © 2001Page 32 Summary Expected exponential growth in J2ME applications Real-Time Java nearly final It’s time to make plans to use Real Time Java

33 11-6-2015 Copyright © 2001Page 33 More information java.sun.com www.rtj.org www.drtsj.org www.embedded.oti.com www.turnkiek.nl wijntjes@turnkiek.nl

34 11-6-2015 Copyright © 2001Page 34 Thank you For your time and attention

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