On Dec 29, 2005, at 7:09 AM, Wolfram Stebel wrote:
<snip>
What am i missing?
There are a few things you can do. One is to follow EOF's suggestion
and add a formatter that can format (convert between) MyType and
String. Given a String s, it will return new MyType(s). Given a
MyType t, it will return t.getValue().
...
I'd prefer a formatter: it keeps the code all in one place and is
easy to reuse. I'd avoid adding code to CSampleTable as you would
have to do this in every object that used MyType.
I followed your recommendations regarding the implementation of the
MyType
class (immutable etc.).
Further i implemented a formatter "MyTypeFormatter" which i use for
data
exchange in my component.
Works like a charm!!!
:-)
One question remains:
I allocate the formatter as a public final member in my application
at the
moment. Is it a reasonable place or should i allocate it in session or
component context?
I would say, session is best for speed, resources and safety, do
you agree?
It should be fine at the application level. As long as you are not
maintaining any data in instance variables (and I don't see any
reason that you would need to do this) then it will be thread safe.
I often place such formatters at the application level and have never
noticed a problem.
P.S. In a short while i will publish my "BaseWOApp" with several
interesting
solutions (MyType EO data type, timertask for property update [from
PropDemo.zip, www.bugs-and-errors.de], page member pushing and
popping for
correct forward and backward navigation, standard error handling
pages...)
That's something for beginners :-)
Something indeed! I'll look forward to this.
Chuck
--
Coming in 2006 - an introduction to web applications using WebObjects
and Xcode http://www.global-village.net/wointro
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems. http://www.global-village.net/products/practical_webobjects
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