In the Web Services world, everything is about standards to follow (web services are not just RPC). In practice, some agent (the name given to the code that implements something) implements some Interface (in the OO sense).
While designing an application server... I faced a problem... The application server I'm talking about will be composed by a "Kernel", that will receive the register requests for each "Agent" loaded by the application. Like....
# The Oak2::Kernel namespace will be populated by
# some Kernel implementation. The idea is that
# Oak2::Kernel is just an API that anyone can
# The following code will load two agents, that will
# automatically register itself in the Kernel.
Now, let's suppose this two different agents provides the same interface... Let's say "http://www.example.com/some/interface". The question completely open is: What would be returned when the user looks up for this interface like...
# This is how it's possible to get any object
# anywhere inside the application server...
my $impl = Oak2::Kernel->lookup("http://www.example.com/some/interface
So, what $impl would be?
- Nothing, Oak2::Kernel would throw an error explaining the user should use a method specifically for multi-implementation interfaces.
- A list or arrayref containing all the implementations for this interface.
- One of the two implementations, randomically selected...
- One of the two implementations, based on some rules (which kind of rules?)
- A proxy object which would propagate all messages to all implementations.
Well, all here is nothing but sketches, so any suggestion is more than wellcome, including its-all-wrong-this-way-would-be-better ones...
Hope you can meditate more than me...
Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
Want more info? How to link or
or How to display code and escape characters
are good places to start.