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CRG talk on Tuesday, August 19, 2003 SeyedMasoud Sadjadi www.cse.msu.edu/~sadjadis Software Engineering and Networking Systems Laboratory Department of.

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Presentation on theme: "CRG talk on Tuesday, August 19, 2003 SeyedMasoud Sadjadi www.cse.msu.edu/~sadjadis Software Engineering and Networking Systems Laboratory Department of."— Presentation transcript:

1 CRG talk on Tuesday, August 19, 2003 SeyedMasoud Sadjadi www.cse.msu.edu/~sadjadis Software Engineering and Networking Systems Laboratory Department of Computer Science and Engineering Michigan State University www.cse.msu.edu/sens ACT: Adaptive CORBA Template

2 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 2 Agenda Motivation Background ACT ACT + QuO Example Pervasive Computing ACT Background Motivation ACT + QuO ExampleOverview: PerCom Conclusion

3 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 3 Motivation  Problem –Distributed applications comprise autonomous programs typically hosted on heterogeneous platforms and distributed over heterogeneous networks. –Traditional middleware such as CORBA masks the distribution of resources across a network and hide differences among computing platforms and networks. –Adaptive middleware provides acceptable quality-of- service, security, fault-tolerance, and so on over different underlying technologies. –However, adding new adaptive functionality to an extant application is complicated when: – The source code of the application is unavailable. – The source code is available but modifying it directly is undesirable. – The application is required to run continuously and cannot be easily taken off-line for upgrade. ACT Background Motivation ACT + QuO ExampleOverview: PerCom Conclusion

4 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 4 Middleware Layers –Domain-Services  Tailored to a specific class of distributed applications –Common-Services  Functionality such as fault tolerance, security, load balancing and transactions –Distribution  Programming-language abstraction –Host-Infrastructure  Platform-abstraction  Schmidt [8] decomposed middleware into four layers: Schmidt’s Middleware layers [2] Note: an adaptive middleware project may fall in more than one layer. Middleware Layers Applications Domain-Specific Middleware Services Common Middleware Services Distribution Middleware Host-Infrastructure Middleware Operating Systems and Protocols Hardware Devices System Platform Motivation BackgroundOverview: Layers CORBA ACT ACT + QuO Example PerCom Conclusion Interceptors

5 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 5 CORBA  CORBA –Common Object Request Broker Architecture. –A distributed object framework by OMG. –Supports distributed object-oriented computing across heterogeneous hardware devices, operating systems, network protocols, and programming languages.  Components  Object  Servant  Client  IDL Compiler  Stub  Skeleton  ORB Core  GIOP/IIOP CORBA architecture [3]. Motivation BackgroundOverview: CORBA Layers ACT ACT + QuO Example PerCom Conclusion Interceptors

6 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 6 CORBA Portable Interceptors  CORBA Request Portable Interceptors Applications Client request flow Client Application Client ORB Servant Server Application reply flow Domain-Services Common-Services Distribution Host-Infrastructure System Platform Client-Request Interceptor Server ORB Server-Request Interceptor Network StubSkeleton Motivation BackgroundOverview: Interceptors CORBA ACT ACT + QuO Example PerCom Conclusion Layers

7 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 7 Agenda ACT Background Motivation ACT + QuO Example Pervasive Computing Motivation Background ACT ACT + QuO ExampleOverview: PerCom Conclusion

8 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 8 Adaptive CORBA Template (ACT)  ACT features –supports “unanticipated” adaptation in CORBA applications. –enables dynamic improvements to CORBA applications in response to changes in their functional requirements or in non-functional concerns, such as quality-of-service, fault-tolerance, and security. –provides a generic model for constructing and enhancing adaptive CORBA frameworks. Extended QuO FrameworkAdaptive CORBA C++ Framework Adaptive CORBA Java Framework Adaptive CORBA Template Motivation Background ACT ACT + QuO ExampleOverview: PerCom Conclusion Features Architecture Core Interaction

9 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 9 ACT Architecture  The flow of a request/reply in an ACT-ready application Applications Client Client Application Servant Server Application Domain-Services Common-Services Distribution Host-Infrastructure System Platform Network Client GI Client ORB Server GI Server ORB Client ACT CoreServer ACT Core request flowreply flow GI: generic interceptor Motivation Background ACT ACT + QuO ExampleOverview: PerCom Conclusion Architecture Features Core Interaction

10 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 10 ACT Core Components  The flow of a request/reply in ACT core components Client ORB Dynamic Interceptors Client ACT Core Rule-Based Interceptor Proxy Decision Maker Event Mediator Client Generic Interceptor request flow to/from the host-infra. middleware reply flow to/from the common-services middleware Motivation Background ACT ACT + QuO ExampleOverview: PerCom Conclusion Core Architecture Features Interaction

11 ClientClient ORBClient GIClient RBIProxyDMEMServer ORB #1 request()#2 intercepting the request#3 intercepting the request #4 raising ForwardRequest exception#5 raising ForwardRequest exception #6 modifying the request target #7 intercepting the request#8 intercepting the request #9 no exception is raised#10 no exception is raised #11 forwarding the request to the proxy #16 forwarding the modified request or a new request to the original application CORBA object #17 intercepting the modified request#18 intercepting the modified request #19 no exception is raised#20 no exception is raised #15 return#14 return #12 consult#13 event #21 sending the modified request to the Server Application #22 sending the reply to the modified request back to the Client Application #23 intercepting the reply#24 intercepting the reply #25 no exception is raised#26 no exception is raised #27 sending the reply to the modified request back to the proxy #32 sending the modified reply to the request back to the client#31 return#30 return #28 consult#29 event #33 intercepting the modified reply#34 intercepting the modified reply #35 no exception is raised#36 no exception is raised#37 return reply request message return message (reply or exception)

12 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 12 Agenda ACT + QuO Background Motivation ACT Example Pervasive Computing Motivation Background ACT + QuO ACT ExampleOverview: PerCom Conclusion

13 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 13 Quality Objects (QuO) Background  The flow of a request/reply in a typical QuO application Contract Client ORBServer ORB Applications Client request flow Client Application Servant Server Application reply flow Domain-Services Common-Services Distribution Host-Infrastructure System Platform Network Client Wrapper Server Wrapper Client QuO CoreServer QuO Core ContractSCs SCs: sytem conditions SCs Motivation Background ACT + QuO ACT ExampleOverview: PerCom Conclusion QuO Background ACT + QuO

14 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 14 Coupling ACT with QuO  The flow of a request/reply in extended QuO framework Motivation Background ACT + QuO ACT ExampleOverview: PerCom Conclusion ACT + QuO QuO Background

15 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 15 Agenda Example Background Motivation ACT ACT + QuO Pervasive Computing Motivation Background Example ACT ACT + QuOOverview: PerCom Conclusion

16 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 16 Case Study: A Surveillance App  A large image taken from a laboratory for surveillance Motivation Background Example ACT ACT + QuOOverview: PerCom Conclusion Introduction ACT Utilities QuO Adaptation ACT + QuO Evaluation

17 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 17 Surveillance Application (1)  Using QuO “UserAdapt” qosket for dynamic adaptation Motivation Background Example ACT ACT + QuOOverview: PerCom Conclusion QuO Adaptation ACT Utilities Introduction ACT + QuO Evaluation

18 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 18 Surveillance Application (2)  Choosing small images to save some bandwidth Motivation Background Example ACT ACT + QuOOverview: PerCom Conclusion QuO Adaptation ACT Utilities Introduction ACT + QuO Evaluation

19 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 19 Surveillance Application (3) Motivation Background Example ACT ACT + QuOOverview: PerCom Conclusion ACT Utilities QuO Adaptation Introduction ACT + QuO Evaluation

20 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 20 Surveillance Application (4)  Dynamic weaving of “UserAdaptFrameRate” qosket Motivation Background Example ACT ACT + QuOOverview: PerCom Conclusion ACT + QuO ACT Utilities Introduction QuO Adaptation Evaluation

21 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 21 Surveillance Application (5)  Choosing slow frame rate using the new qosket Motivation Background Example ACT ACT + QuOOverview: PerCom Conclusion ACT + QuO ACT Utilities Introduction QuO Adaptation Evaluation

22 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 22 ACT + QuO Evaluation  Evaluating the ACT overhead –Small overhead –Negligible Motivation Background Example ACT ACT + QuOOverview: PerCom Conclusion Evaluation ACT Utilities Introduction QuO Adaptation ACT + QuO

23 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 23 ACT + QuO Evaluation  The frame rate in the surveillance application –At point 60, a one time delay is introduced for loading ACT core component and making the application ACT-ready. –The overhead introduced by ACT is negligible Motivation Background Example ACT ACT + QuOOverview: PerCom Conclusion Evaluation ACT Utilities Introduction QuO Adaptation ACT + QuO

24 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 24 Agenda Pervasive Computing Background Motivation ACT ACT + QuO Example Motivation Background PerCom ACT ACT + QuOOverview: Example Conclusion

25 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 25 Pervasive Computing  Motivation –Using extant CORBA application in pervasive computing transparently.  Challenges –Transparent Hand-off  Using active/passive application replication  Requires generic proxies –Heterogeneous devices and networks  Small devices  Wireless networks  Mobile computing –Extended period of disconnection –IP changes –Application specific unanticipated adaptation  Such as the surveillance application Motivation Background PerCom ACT ACT + QuOOverview: Example Conclusion Motivation Discussion ACT Solution

26 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 26 ACT Solution for PerCom  ACT for PerCom Motivation Background PerCom ACT ACT + QuOOverview: Example Conclusion ACT Solution Discussion Motivation Client ORB Dynamic Interceptors Client ACT Core Rule-Based Interceptor Generic Proxy Decision Maker Event Mediator Client Generic Interceptor request flow to/from the host-infra. middleware reply flow to/from the common-services middleware DSIDII Log –Generic proxy –DSI & DII –Logging –Active/ passive replica consistency –Async. method invocation –Time out –Heartbeat –Dynamic weaving of qoskets

27 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 27 Discussion  How do you evaluate this approach to support pervasive computing? Motivation Background PerCom ACT ACT + QuOOverview: Example Conclusion Discussion Motivation ACT Solution

28 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 28 Conclusion  ACT supports unanticipated adaptation in CORBA application transparently.  ACT can be used to construct adaptive CORBA frameworks.  ACT can be used to enhance existing adaptive CORBA frameworks.  ACT can be used to enable or improve the interoperability among different adaptive middleware approaches.  The overhead introduced by ACT is negligible. Motivation Background Conclusion ACT ACT + QuOOverview: Example PerCom

29 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 29 References [1] S. M. Sadjadi and P. K. McKinley. Act: An adaptive corba template to support unanticipated adaptation. Technical Report MSU-CSE-03-22, Department of Computer Science, Michigan State University, East Lansing, Michigan, August 2003. [2] Douglas C. Schmidt. Middleware for real-time and embedded systems. Communications of the ACM, 45(6), June 2002. [3] http://www.cs.wustl.edu/~schmidt/corba-overview.html. [4] John A. Zinky, David E. Bakken, and Richard E. Schantz. Architectural support for quality of service for CORBA objects. Theory and Practice of Object Systems, 3(1), 1997. [5] Victor C. Zandy and Barton P. Miller. Reliable network connections. In ACM MobiCom 2002, Atlanta, September 2002. [6] C. Marchetti, L. Verde, and R. Baldoni. CORBA request portable interceptors: A performance analysis. In the 3nd International Symposium on Distributed Objects and Applications (DOA 2001), Rome, Italy, Sept. 2001. [7] L. Moser, P. Melliar-Smith, P. Narasimhan, L. Tewksbury, and V. Kalogeraki. The eternal system: an architecture for enterprise applications. In the 3rd International Enterprise Distributed Object Computing Conference (EDOC'99), July 1999. Motivation Background ACT ACT + QuOOverview: Example PerCom Conclusion

30 CRG presentation on Aug. 19, 2003ACT: Adaptive CORBA Template by S. M. Sadjadi 30 Questions? Thank you! Motivation Background ACT ACT + QuOOverview: Example PerCom Conclusion

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