Hello
All,
Just want to make
sure that after reading all the books, I'm actually doing something sensible
with my code . . . .
Lets say I have an
entity (in this case "Page"). I have the Page class, PageDAO
for abstracting persistence and PageService for wrapping all general
page services (I'm including Gateway within DAO in this particular case).
PageDAO is only ever called by PageService.
Now imagine there
are few enough pages that it makes sense to lazy load them into
memory.
Right now I have a
PageService.getPagebyFilePath() which returns a Page object for the appropriate
page (filepath is the unique page key available at runtime to the
controller)
It does
an:
if(not isDefined("THIS.page.#Arguments.FilePath#"))
{
Local.TempPage = createObject("component","prototype.entity.systemsforge.Page").init();
THIS.page[#Arguments.FilePath#] = Application.PageDAO.LoadPage(Local.TempPage,"#Arguments.FilePath#");};
{
Local.TempPage = createObject("component","prototype.entity.systemsforge.Page").init();
THIS.page[#Arguments.FilePath#] = Application.PageDAO.LoadPage(Local.TempPage,"#Arguments.FilePath#");};
so if the page
doesn't exist in the PageService's THIS scope (the service is application
scoped), it creates the page and then calls the DAO to load data into
it.
Originally my code
called the DAO which created the object and loaded it, but then I though "why
should a DAO know how to create a page - it should only know how to load
it"
Then I tried putting
the call to the DAO into the init script of the Page object itself, but then I
asked myself the question: why would a page know where it's data was and hence
where to load from.
So I ended up
putting the DAO call into the Service which is responsible for orchestrating
pages within the framework and therefore might well be expected to know both how
to create a Page and how to load data into it.
Does this make
sense? Am I going vaguely in the right direction with this? Any potholes in the
road ahead I should be looking out for?!
Any input much
appreciated!
Best
Wishes,
Peter
Peter
Please note that I'm
effectively using the PageService as a factory for returning Pages (and taking
care of lazy loading/caching) as it didn't seem to be enough extra work to
bother with a separate PageFactory class.
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