Differences

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--- proj1 [2010/10/07 21:00] – roumani
+++ proj1 [2010/10/09 22:45] (current) – roumani
@@ Line 7: / Line 7: @@
 ====== Resources ======
+The (highly readable) authoritative documents on Servlets and JSP are posted under //Resources// along with their APIs. Also posted is a tutorial and a link to a site with JEE highlights.
-[[http://www.perl.org/|Authoritative page]]
-[[http://www.comp.leeds.ac.uk/Perl/start.html|Tutorial]]
-[[http://www.cse.yorku.ca/~roumani/perl/|My page]]
 ====== Base Requirement ======
-Whenever a user visits the URL of your webapp, a screen similar to the following is displayed:
+See the page of Project 0.
-{{:proj0.jpg|}}
-The webapp allows several users to concurrently create a list of countries. The user enters a country name and then clicks the "add" button. The above screen shows that 4 countries have been entered so far (by all users) and 2 of them were created by this user in this session (the other 2 may have been created by other users or by this user in a prior session). The master list is displayed beneath as shown.
-**Validation** \\
-  * If the entry made by the user is already present in the master list then it is rejected. In that case, the same screen is re-served (with its information updated to reflect any changes made by others in the master list) but with a line added at the top containing, in red colour, the message: "This country has already been added". Furthermore, the text box must be filled with whatever the user entered; i.e. the entry is echoed back.
-  * If the entry is empty or contains only whitespace then it is also rejected, and the form is re-served, as above, with the message: "Country name cannot be blank!".
-In all other cases, the country is added, the form re-served, and no message appears at the top.
 ====== Possible Variations ======
+The same variations listed in Project 0 apply as-is to this project. In addition, the following enhancements over our reference implementation (posted as ''Proj1B.war'') are to be explored:
-  * Country name must be made up of letters and possibly a hyphen in the middle.
+  * Persist the webapp data when the controller is destroyed and load it when it starts.
-  * The master list should be displayed sorted.
+  * When you implement the above data persistence, pay attention to concurrency. In addition, avoid mixing concerns. Specifically, saving data is the concern of the model; the name of the file is the concern of the end-user; the path leading to the file is environmental and is therefore the concern of the controller.
-  * Don't send the master list if the client is iPhone or Blackberry.
-  * If a user remained idle while others are adding countries, the counter on the screen would not remain correct. Fix this.
-  * Map your app's URL to a directory.
-  * Add logging to your webapp.
-  * Add authentication to your webapp.
+  * Migrate messages (such as //Cannot be Blank//) from the controller to the view.
-  * Add confidentiality to your webapp.
+  * Make one error message appear in red and the other in blue.
-  * Trigger an event if a user successfully added more than 5 counties per session.
+  * Reset the user's count if the user remained idle for 1 minute. Do this even if the session has not expired yet.
-  * Compress your webapp's response.
+  * Send an error message if the used URL includes the string "York" (case insensitive), e.g. /york.do. Ideally, set some unused HTTP error status code and have web.xml auto serve an error page (see the <error-page> tag in web.xml).
-  * Keep track of the counties entered by the user in the session, not just the count, and enable the user to view them.
+  * Deploy your webapp on red. To that end, install tomcat (via the ''tomcat_install'' command) and then start it via ''tomcat_start''. Add ''web.xml'' to your webapp (see posted sample and instructions) and comment out the annotation import line. Export your webapp to a war and put it in the ''webapps'' directory. If you need to make (minor) changes in red, edit the source files and compile them using ''tomcat_compile''. Alternatively, use the ''eclipseEE' command to launch eclipse on red.
-  * Enable richer content. Rather than just a country name, the user may also enter the capital and possibly the population.
-The following two variations require CSS and JavaScript:
+The following two variations require filters and listeners:
-  * Rather than serve the list every time, change the UI to a sidebar and two links "Add a Country" and  "Show Master List"
+  * If a client managed to enter over five countries within a session, flag it as a "Power User" and post its IP at the top of each served page.
-  * To improve responsiveness, and to place less demand on the network, have the client do some validation. Server validation should remain unchanged (why?).
+  * Inject a new validation rule: //"countries less than three characters are not allowed during lunch hour"// :-D