Software Engineering for Internet Applications - Student Community

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isn't worth the programming and system administration effort. Theuser database should have a facility for recording the reliability of auser's name and email address since the name is likely to becomemore reliably known over time and the email address less likely.To contribute to an accountable and identified environment the userdatabase should be able to store a personal URL for each user. Ifthis is a Yahoo! Geocities page it won't contribute too much toaccountability and identification. On the other hand if the URL startswith "http://research.hp.com/personal/" it will give other users someconfidence. Since one of the sad features of the Web as architectedin 1990 is that URLs rot, a user database needs an extra field to keeptrack of what has happened when a robot tries to visit the recordedURL. If a URL has not been reachable on several separate occasionsover a one-week period, it is probably safe for a computer program toassume that the URL is out of date and stop displaying it publicly.The user database should record privacy and contact preferences. IsJane User willing to let you show her email address to the public? Toother registered users? Is Joe User willing to let you spam him withnews of the site?4.3 Content DatabaseThe content of an online learning community always includesquestions and answers in a discussion forum. A programmer mightstart by building a table for discussion forum postings. Among the sixrequired elements of online community magnet content is listed first.Most online learning communities offer published articles that aredistinguished from user-contributed questions. A programmer wouldtherefore create a separate table to hold articles. Any well-crafted sitethat publishes articles provides a facility for users to contributecomments on those articles. This will be another separate table.Is a pattern emerging here? We distinguish a question in thediscussion forum table because it is an item of content that is not aresponse to any other discussion forum posting. We distinguisharticles from comments because an article is an item of content thatis not a response to any other content item. Perhaps therepresentation of articles, comments on articles, questions, answers,etc. should be unified to the maximum extent possible. Each is acontent item. Each has one or more authors. Each may optionally bea response to another content item.62193.2.79.250 - - [06/Mar/2003:09:12:00 -0500] "GET/dogs/philip-and-george-sm.jpg HTTP/1.1" 200 9574"http://philip.greenspun.com/dogs/george" "Mozilla/4.0(compatible; MSIE 5.0; Windows NT; DigExt)"152.31.2.221 - - [06/Mar/2003:09:12:00 -0500] "GET/comments/attachment/44949/FriendsProjectCar.jpgHTTP/1.1" 200 36340"http://philip.greenspun.com/materialism/cars/nsx.html""Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)"193.2.79.250 - - [06/Mar/2003:09:12:00 -0500] "GET/comments/attachment/35069/muffin.jpg HTTP/1.1" 200 15017"http://philip.greenspun.com/dogs/george" "Mozilla/4.0(compatible; MSIE 5.0; Windows NT; DigExt)"152.31.2.221 - - [06/Mar/2003:09:12:01 -0500] "GET/comments/attachment/77819/z06.jpg HTTP/1.1" 200 46996"http://philip.greenspun.com/materialism/cars/nsx.html""Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)"151.199.192.112 - - [06/Mar/2003:09:12:01 -0500] "GET/comments/attachment/137758/GT%20NSX%202.jpg HTTP/1.1"200 12656"http://philip.greenspun.com/materialism/cars/nsx""Mozilla/4.0 (compatible; MSIE 5.0; Mac_PowerPC)"152.31.2.221 - - [06/Mar/2003:09:12:02 -0500] "GET/comments/attachment/171519/photo_002.jpg HTTP/1.1" 20045618"http://philip.greenspun.com/materialism/cars/nsx.html""Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)"151.199.192.112 - - [06/Mar/2003:09:12:27 -0500] "GET/comments/attachment/143336/Veil%20Side%20Skyline%20GTR2.jpg HTTP/1.1" 200 40372"http://philip.greenspun.com/materialism/cars/nsx""Mozilla/4.0 (compatible; MSIE 5.0; Mac_PowerPC)"147.102.16.28 - - [06/Mar/2003:09:12:29 -0500] "GET/photo/pcd1253/canal-street-43.1.jpg HTTP/1.1" 302 336"http://philip.greenspun.com/wtr/applicationservers.html""Mozilla/4.0 (compatible; MSIE 5.01;Windows NT)"147.102.16.28 - - [06/Mar/2003:09:12:29 -0500] "GET/photo/pcd2388/john-harvard-statue-7.1.jpg HTTP/1.1" 302342 "http://philip.greenspun.com/wtr/applicationservers.html""Mozilla/4.0 (compatible; MSIE 5.01;Windows NT)"147.102.16.28 - - [06/Mar/2003:09:12:31 -0500] "GET/wtr/application-servers.html HTTP/1.1" 200 0"http://www.google.com/search?q=application+servers&ie=ISO-8859-7&hl=el&lr=" "Mozilla/4.0 (compatible; MSIE 5.01;Windows NT)"The first line can be decoded as follows:A user on a computer at the IP address 193.2.79.250, who is nottelling us his login name on that computer nor supplying an HTTPauthentication login name to the Web server (- -), on March 6, 2003287
found" will result in an access log entry but not a error log entrybecause the server did not have to catch a script bug. By contrast ascript sending an illegal SQL command to the database will result inboth an access log and an error log entry.Below is a snippet from the filehttp://philip.greenspun.com/seia/examples-user-activityanalysis/2003-03-06.log.gz,which records one day of activity on thisserver (philip.greenspun.com). Notice that the name of the log file,"2003-03-06", is arranged so that chronological success will result inlexicographical sorting succession and therefore when viewing files ina directory listing you'll see a continuous progression from oldest tonewest. The file itself is in the "Common Logfile Format", a standarddeveloped in 1995.193.2.79.250 - - [06/Mar/2003:09:11:59 -0500] "GET/dogs/george HTTP/1.1" 200 0 "http://www.photo.net/""Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)"193.2.79.250 - - [06/Mar/2003:09:11:59 -0500] "GET/dogs/sky-and-philip.jpg HTTP/1.1" 200 9596"http://philip.greenspun.com/dogs/george" "Mozilla/4.0(compatible; MSIE 5.0; Windows NT; DigExt)"193.2.79.250 - - [06/Mar/2003:09:11:59 -0500] "GET/dogs/george-28.jpg HTTP/1.1" 200 10154"http://philip.greenspun.com/dogs/george" "Mozilla/4.0(compatible; MSIE 5.0; Windows NT; DigExt)"193.2.79.250 - - [06/Mar/2003:09:11:59 -0500] "GET/dogs/nika-36.jpg HTTP/1.1" 200 8627"http://philip.greenspun.com/dogs/george" "Mozilla/4.0(compatible; MSIE 5.0; Windows NT; DigExt)"193.2.79.250 - - [06/Mar/2003:09:11:59 -0500] "GET/dogs/george-nika-provoke.jpg HTTP/1.1" 200 11949"http://philip.greenspun.com/dogs/george" "Mozilla/4.0(compatible; MSIE 5.0; Windows NT; DigExt)"152.31.2.221 - - [06/Mar/2003:09:11:59 -0500] "GET/comments/attachment/36106/bmwz81.jpg HTTP/1.1" 200 38751"http://philip.greenspun.com/materialism/cars/nsx.html""Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)"193.2.79.250 - - [06/Mar/2003:09:12:00 -0500] "GET/dogs/george-nika-grapple.jpg HTTP/1.1" 200 7887"http://philip.greenspun.com/dogs/george" "Mozilla/4.0(compatible; MSIE 5.0; Windows NT; DigExt)"193.2.79.250 - - [06/Mar/2003:09:12:00 -0500] "GET/dogs/george-nika-bite.jpg HTTP/1.1" 200 10977"http://philip.greenspun.com/dogs/george" "Mozilla/4.0(compatible; MSIE 5.0; Windows NT; DigExt)"193.2.79.250 - - [06/Mar/2003:09:12:00 -0500] "GET/dogs/george-29.jpg HTTP/1.1" 200 10763"http://philip.greenspun.com/dogs/george" "Mozilla/4.0(compatible; MSIE 5.0; Windows NT; DigExt)"286Here are some services that would be nice to centralize in a singlecontent repository within the content database:• versioning of content• whether an item of content is a reply to, a comment on, oran attachment to some other item• whether an item of content has been approved ordisapproved by the site moderators• to whom may the content be shown? Is it only for membersof a group, a particular user, or le grand public (as they sayin France)• who has the right to edit the content?• who has the right to change who has the right to view oredit?• who has the right to comment on an item? Who must reviewcomments that have been posted before they go live?• timing the content: When does it go live? When does itexpire?• quality or importance of the content: Should this behighlighted to users? Should it be withheld until it graduatesfrom draft status?• full-text indexing of the content• summaries, descriptions, and keywords for the content• a consistent site-wide taxonomyplus some things that really belong in the user/contentmap below• who authored or contributed an item, with a distinctionamong publisher-authored, group-authored, and userauthoredstuff• who should be notified via email when a comment on orresponse to an item is posted• whether a content item is rated of high interest by a user orlow/no interest; given these stats, this implies the ability topick out "new content that is likely to be of interest to User#17" (depends on text processing software that cancompute document similarity)4.4 User/Content MapAn online learning community generally needs to be able to recordthe following statements:63
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SoftwareEngineering forInternetAppl
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Signature: ________________________
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end-users. We use every opportunity
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• availability of magnet content
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• we want to see if a student is
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Page 43 and 44: ReferencesEngagement ManagementSQL*
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than one call to contains in the sa
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A third argument against the split
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way 1 1/16One might argue that this
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absquatulate 612bedizen 36, 9211cry
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What if the user typed multiple wor
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Chapter 12S E A R C HRecall from th
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long as it is much easier to remove
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features that are helpful? What fea
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made it in 1938)? Upon reflection,
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environment, we identify users by t
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those updates by no more than 1 min
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Balancer and mod_backhand, a load b
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translation had elapsed--the site w
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It seems reasonable to expect that
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11.1.5 Transport-Layer EncryptionWh
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such as ticket bookings would colla
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give their site a unique look and f
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It isn't challenging to throw hardw
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Chapter 11Scaling GracefullyLet's l
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10.15 Beyond VoiceXML: Conversation
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Consider that if you're authenticat
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In this example, we:194• ask the
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As in any XML document, every openi
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(http://www.voicegenie.com). These
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Chapter 10Voice (VoiceXML)questions
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9.15 MoreStandards information:•
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9.14 The FutureIn most countries th
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9.10 Exercise 7: Build a Pulse Page
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9.6 Keypad HyperlinksLet's look at
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text/xml,application/xml,applicatio
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Protocol (IP) routing, a standard H
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