Hi,
Interesting. My only question, due to performance...why not use "int" value
returns instead of Strings. Mainly because I am quite sure evaulating an int
value is much faster than doing a string comparison. I realize Strings are
nice, easy to understand, but in terms of performance I would imagine using
int values would be much faster for lookup in the DOM.
Incidentally, how are you reading in your XML file, and into what type of
object? I have heard alot about how some of the free XML parsers turn XML
files into a DOM object. Is that part of the XML package? Or is it an object
you create? I would love to get more info on this process as I want to
implement this soon.
>-----Original Message-----
>From: A mailing list about Java Server Pages specification and reference
>[mailto:[EMAIL PROTECTED]]On Behalf Of Donald E. Vandenbeld
>Sent: Tuesday, April 11, 2000 1:48 PM
>To: [EMAIL PROTECTED]
>Subject: Re: More on Model 2/little confused
>
>
>I'm doing it something like this:
>
>First off, I'm using an xml file to store my configuration. This
>works best
>for me but a simpler configuration could easily use a properties file.
>
>The first part of the config file defines resource types (by resource I
>basically mean 'pages' within the site that may be accessed). I define the
>following:
>
> <resource id="static">
> <path>/</path>
> <extension>.html</extension>
> </resource>
>
> <resource id="dynamic">
> <path>/</path>
> <extension>.jsp</extension>
> </resource>
>
> <resource id="program">
> <path>/servlet/</path>
> </resource>
>
>I then create a series of stimulus defintions. These define what action to
>take given a certain stimulus. The stimulus is simply a parameter called
>'action' that gets defined in every form in the site. Here is a simple
>stimulus definition:
>
><stimulus id="Login">
> <action type="dynamic">login</action>
></stimulus>
>
>So, if the current 'action' request parameter is equal to "Login", the
>controller servlet should redirect to the 'login' page. Because of my use
>of resource types, this gets translated into: /login.jsp (this make it
>really easy to install the site in different directories on different
>servers). Here is a more complex stimulus definition:
>
><stimulus id="ValidateInitialLogin">
> <action type="program">AuthenticateServlet</action>
> <intent>
> <default>CheckAnnouncement</default>
> <condition result="user">CheckAnnouncement</condition>
> <condition result="instructor">CheckInstructorAnnouncement</condition>
> <condition result="staff">CheckStaffAnnouncement</condition>
> <condition result="admin">CheckAdminErrors</condition>
> <condition result="error">Login</condition>
> </intent>
></stimulus>
>
>If the current action is 'ValidateInitialLogin', the controller servlet
>should redirect to the AuthenticateServlet. Where my
>implementation differs
>a bit is that I can specify different actions to take depending on the
>results of the AuthenticateServlet. For instance, if this latter servlet
>gets an error, it should set the action variable to 'Login'. If the
>AuthenticateServlet runs and finds that the user belongs to a
>class of users
>called 'instructor', the servlet should get the action variable to
>'CheckInstructorAnnouncement'. The default tag is maybe a little
>missleading - it is really supposed to indicate the default condition.
>
>This system works pretty nicely. These 'action servlets' simply create
>beans that do all the real work (connecting to databases, performing
>queries, etc) and then set a (string) result code. A few lines of code at
>the end of each of these action servlets redirects to the
>appropriate jsp or
>servlet depending on the result code. I'd be interested in hearing about
>how others implemented this idea (or critiques of the way I did it).
>
>Donald
>
>> >From: Mistroni Marco <[EMAIL PROTECTED]>
>> >Reply-To: [EMAIL PROTECTED]
>> >To: [EMAIL PROTECTED]
>> >Subject: More on Model 2/little confused
>> >Date: Tue, 11 Apr 2000 12:39:49 +0300
>> >
>> >Hi All,
>> > i have followed many threads about Model 2 architecture, and at
>> >the
>> >hand i got
>> >this picture(please correct me if i am wrong) listed below shortly :
>> >- JSP 'sends' the request to the Servlet/controller
>> >- based on 'path info' the Servlet fetches from an Hashtable the correct
>> >Action class to instantiate
>> >- action class does the logic, populates a JavaBean and send the request
>to
>> >the JSP
>> >- the JSP fetches the request data and present it to the User
>> >
>> >Well, in this scenario something is not clear to me:
>> >- how can the Action class know the URL of the JSP page to send the
>> >response??? i don't want to hardcode it into the java class, and in one
>> >thread Craig McClanahan wrote
>> >
>> > >Now, I tend to add a public method in my controller servlet that can
>look
>> >up actual page names from a logical name (as >someone else in this
>thread
>> >recommended).
>> >
>> >well i did not get this idea......could u pls explain me more?? for
>> >example,
>> >suppose that i store all the URL of the JSP in the config file..and then
>> >populate (in the init() of the servlet) an Hashtable with all the
>> >URL....then when i communicate it to the Action?? do i say it when i
>create
>> >the Action class that i am going to use???
>> >
>> >the other thing that is not clear is:
>> >- how can i use a single instance of the various Action classes
>that i am
>> >going to use??? sorry for this question, but i don't know much about
>> >performance............will i have much disadvantages if i instantiate
>> >every request a new Action class??
>> >
>> >can anyone that got the picture explain it better to me??
>> >
>> >sorry Craig, Kevin and Daniel for bothering again...
>> >
>> >thanx to all in advance
>> >best regards
>> > marco
>> >
>
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