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WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 A Runtime System for Interactive Web Services Claus Brabrand, Anders Møller,

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Presentation on theme: "WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 A Runtime System for Interactive Web Services Claus Brabrand, Anders Møller,"— Presentation transcript:

1 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 A Runtime System for Interactive Web Services Claus Brabrand, Anders Møller, Anders Sandholm, Michael I. Schwartzbach BRICS, University of Aarhus, Denmark

2 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Plan Illustrate problems with CGI –example interactive web service. Solve problems one by one –building on top of CGI. Additional problems and solutions. Package solutions into runtime system. Conclusion.

3 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 An Interactive Web Service

4 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Problem: Save, Restore State : :

5 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Problem: Bookmarks

6 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Problem: Bookmarks Bookmark What?

7 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Problem: Back Button

8 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Problem: Back Button

9 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Problem: Back Button Pay twice ?!

10 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 CGI Problems Save, Restore State Bookmark Back Button

11 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 CGI Problems Save, Restore State Bookmark Back Button

12 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Components Internet client HTTP server program database CGIHTML CGI restore ; compute ; save

13 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Adding a ”Connector” Internet client HTTP server program database CGI HTML CGI connector HTML CGI HTML restore ; compute ; save redirect

14 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 CGI Problems Save, Restore State Bookmark Back Button

15 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 CGI Problems Save, Restore StateConnector Bookmark Back Button

16 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 CGI Problems Save, Restore StateConnector Bookmark Back Button

17 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Problem: Bookmarks Problem: –CGI URL bookmarked (not HTML response). Consequence: –Must complete entire service right away. Would like: –Pause service (bookmark), resume later.

18 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Components Internet client HTTP server program database CGI HTML CGI connector HTML CGI HTML

19 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Adding an HTML “Reply File” Internet client HTTP server program database CGI done! CGI connector jump CGI jump HTML reply file HTML

20 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 CGI Problems Save, Restore StateConnector Bookmark Back Button

21 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 CGI Problems Save, Restore StateConnector BookmarkReply File Back Button

22 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 CGI Problems Save, Restore StateConnector BookmarkReply File Back Button

23 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Problem: Back Button Problem: History of old requests: –Annoying. –No longer make sense. –Dangerous! (for client and server) Would like: –Back should take us “back”. –Never see old CGI requests.

24 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Components Internet client HTTP server program database CGI done! CGI connector jump CGI jump HTML reply file HTML

25 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Components Internet client HTTP server program database CGI done! CGI connector jump CGI jump HTML reply file HTML same URL

26 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 CGI Problems Save, Restore StateConnector BookmarkReply File Back Button

27 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 CGI Problems Save, Restore StateConnector BookmarkReply File Back ButtonReply File

28 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Additional Problems

29 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Additional Problems

30 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 What is going on? Error? Abort... –Package Lost? –Service Crash? –Connection? Ok? …or Wait !? –Searching Database? –Long Computation? –Waiting for a Resource?

31 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Problem: User Impatience Consequence: –Users leave service. Would like: –Explain delays. “Searching database … Please wait.”.

32 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Components Internet client HTTP server program database CGI done! CGI connector jump CGI jump HTML reply file HTML

33 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Adding a Connector Timeout Internet client HTTP server program database CGI done CGI connector jump CGI jump HTML reply file update Timeout

34 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 CGI Problems Save, Restore StateConnector BookmarkReply File Back ButtonReply File User Impatience

35 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 CGI Problems Save, Restore StateConnector BookmarkReply File Back ButtonReply File User Impatience+ Timeout

36 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 CGI Problems Save, Restore StateConnector BookmarkReply File Back ButtonReply File User Impatience+ Timeout Concurrency Control

37 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Concurrency Control Problem: Parallel service processes. –Access shared resources. –Require synchronization. Solution: –Allow separate specification of constraints. –Use safety controller process Ensures that service obeys constraints.

38 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Components Internet client HTTP server program database CGI done CGI connector jump CGI jump HTML reply file update Timeout

39 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Adding a Safety Controller Internet client HTTP server program database CGI done CGI connector jump CGI jump HTML reply file update controller wait pass Timeout

40 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 CGI Problems Save, Restore StateConnector BookmarkReply File Back ButtonReply File User Impatience+ Timeout Concurrency Control

41 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 CGI Problems Save, Restore StateConnector BookmarkReply File Back ButtonReply File User Impatience+ Timeout Concurrency ControlController

42 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Runtime System Everything implemented! –in C for Unix / Linux. Available: http://www.brics.dk/bigwig/runwig/ –Source –Documentation. –Examples.

43 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Research project at BRICS. Domain specific high-level language: –Rapid construction of interactive web services. –Compiles into: HTML, CGI, Java, JavaScript, … –Uses our runtime system extensively. http://www.brics.dk/bigwig/

44 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Research project at BRICS. Domain specific high-level language: –Rapid construction of interactive web services. –Compiles into: HTML, CGI, Java, JavaScript, … –Uses our runtime system extensively. http://www.brics.dk/bigwig/

45 WWW8 - Toronto "A Runtime System for Interactive Web Services" May 12, 1999 Conclusion CGI: widely used, but inherently low- level. Our Runtime System: –Higher level. –Built on top of CGI. –Compact and efficient. –Solves the problems discussed.

46 The CGI Model CGI ClientServer restore ; compute ; save CGI HTML read ; fill-out ; submit read ; fill-out ; submit restore ; compute ; save

47 Adding a “Connector” CGI ClientServer CGI HTML read ; fill-out ; submit read ; fill-out ; submit awake ; compute ; sleep awake ; compute ; sleep

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