Hey all,
I'm new to the list, and haven't yet had anytime to lurk to see what this
list is all about, and I apologize if I'm asking a question which has been
answered before (I don't see a link to any archives on the CFCZone site),
or if I'm asking a question that doesn't belong here.
For a little background about myself, my name is Brandon Harper, and I
live in Denver, Colorado. I've been developing in ColdFusion right around
the time 3.0 was released (a bit over 5 years now), I'm a Junior as
Computer Science major, and have been on computers since age 3 (I recently
turned 25), and have been programming since age 8 or so. My niche areas
of expertise beyond ColdFusion are in FreeBSD, Data Warehousing, and
general topics such as application security, and I'm starting to get a
pretty good knowledge of advanced analytics/scoring.
Anyhow, I'm in the process of creating a "Data Services Layer" in CFC's
which all of our applications at work will eventually use. We have around
180 different datasources of various LARGE datasources, of which the
structure of those sources changes on a regular basis. They also have to
have various security, logging, and availability parameters checked and
defined during each query for compliance reasons. These sources are
exposed to our various web products, as well as some XML Gateways which
will probably be upgraded to SOAP once this project is completed-- but the
DS Layer would sort of be the universal location that all of our products
would go to for access to our data instead of every application being
essentially a one-off as far as logging, security, and access to these
sources is concerned.
If I were working in Java (which I'm admittedly quite green in at this
point), I'd probably setup a hierarchy similar to this and just use
"implements" to roll-up the various classes:
+--Dataservices.class (Main Interface)
+----DataManager.class (provides logging, security, checks DSN
availability, then runs the individual query)
+-----Datasource1.class
+-- doDatasource1Query()
+-- getDatasource1RecordCount()
-----Datasource2.class
-----Datasource3.class
.. or something like that at least.
I'm still setting up the structure of the application, and I keep chasing
my own tail with design issues since there isn't a feature similar to
Java's multiple inheritance (with interfaces) to tie CFC's to each
other. In other words, I have fundamental issues with not being able to
extend/inherit other CFC's which are all on the same level (such as all of
what would be each CFC for each different datasources).. using extends
only works with CFC's that are in different levels in a hierarchy.
Sorry to ramble.. on with the questions...
1.) I noticed that on Sean Corfields article "Software Design Patterns for
Flash Remoting" (
http://www.macromedia.com/devnet/mx/flashremoting/articles/facades.html ),
the facade is setup to just invoke the other components via cfinvoke. The
skeptic in me assumes that this would be a pretty big performance penalty
in a busy environment, esp. when passing big sets of data between the
components since you are instantiating the CFC each time you call it? I
haven't actually worked with an application which didn't instantiate
objects into a shared scope, so I wouldn't have an idea offhand how
harmful it is.
2.) About the only other way I can think of offhand to do a similar
feature to doing multiple inheritance in CFC's without having to cfinvoke
each time would be to create a CFC full of cfincludes which included all
of the various files which made up the individual datasources (and
associated functions). Such as:
datasources.cfc
- datasource1.cfm
- datasource2.cfm
That seems like a big, messy hack to me though. Perhaps the cfinvoke
method is more painless than I think? Any other suggestions by
chance? Hopefully I'm explaining myself reasonably well?
The main reason I'm trying to keep each datasource seperate is so that a
developer can check out a single file for each datasource if it needs to
be modified rather than checking out a CFC which contains all of them
which more than one person might need to use at the same time.
Thanks,
- Brandon
--------------------------
http://booms.net
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