Best practice for mutable global variables

I have read around a couple of posts regarding the topic and still haven't come to any with just the right answer for the best way to work with a variable which everybody other object needs to read and/or write? I have read about multiple ways for immutable variables but not quite sure what to do with mutable ones.
I prefer to declare them in a global.h file
extern NSString *currentUserName;
and then in the global.m file
NSString *currentUserName = @"none";
in this scenario a user can login or logout at any time so every object throughtout the program should be able to change the username.
Any inputs as to why thise shouldn't be done like this? Any other ideas?
Message was edited by: rnieves_liberty, changed tags for code

Is this a multithreaded application? If it is, then you will need to use some sort of locking on it. I prefer the "@synchronized" directive.
The proper way to handle something like this is with a singleton. Ideally, that singleton should be a UserNameController. It, and only it, should be able to update the user name. Anyone else has read access only.

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user6003393 wrote:
I am using JDeveloper 11.1.2.3.
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Good Morning,
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Troy
Message was edited by: Troy Currence

Hi,
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suggest the designing of the web application which will serve the xml file over the http protocol and getting the contents into variable (which in turn can be used in OSB message flow). Can we address this problem without creating the extra Project and adding the Dependencies? I read configuration file approach too..but the sample configuration file doesn't show entry of .xml file as resources
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Edited by: Sushil Deshpande on Jan 24, 2011 10:56 AM

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What's best practice for logging messages in pageflow?

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struct Params
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Here are some more specific questions:
Most of the LabVIEW examples that I've seen (at least at the beginner level) seem to heavily rely on using the front panel controls to provide inputs to functions. How do I build a VI where the input arguments(input1, input2, etc) come as numbers, and aren't tied to dials or buttons on the front panel?
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If the front panel is never opened the controls are merely used to send data to the VI, much like (identical to) the declaration of a C-function. The indicators can/will be return values.
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Basically one function is one VI, although you might want to split it even further, dont create 3k*3k pixel diagrams.
Depending on the amount of calculations done in your If-Thens they might be sub vi's of their own.
/Y
LabVIEW 8.2 - 2014
"Only dead fish swim downstream" - "My life for Kudos!" - "Dumb people repeat old mistakes - smart ones create new ones."
G# - Free award winning reference based OOP for LV

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erks = Service.getRenderKitService(fctx, ExtendedRenderKitService.class);
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script.append("var textInput = ");
script.append("AdfPage.PAGE.findComponentByAbsoluteId");
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UIComponent component = null;
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component = JSFUtils.findComponentInRoot(id);
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Hi,
I am developing an ADF application where the users do not want to use the mouse. So I would like to know if there are a best practice for this?
Well HTML (and this is the user interface you see) follows a tab index navigation that you follow with "tab" and "shift+tab". Anything else is a short cut for which you use mnemonics (as you already do) or shortcuts (explained in http://one-size-doesnt-fit-all.blogspot.dk/2010/11/adf-ui-shell-supporting-global-hotkeys.html). There is a distinction to make between non-web environments (which I think you and your users have abackground in) and client desktop environments. Browsers block some keyboard functionality for their own purpose. So you may have to find a list of keys first that work across browsers. Unlike desktop clients, which allow you to "press a button" without the button to take focus, this cannot be done on the web. So you need to be clever here, avoiding buttons at all.
The following paper is about JavaScript in ADF and explains the basics for what Chris Muir explains in : http://one-size-doesnt-fit-all.blogspot.dk/2010/11/adf-ui-shell-supporting-global-hotkeys.html
http://www.oracle.com/technetwork/developer-tools/jdev/1-2011-javascript-302460.pdf
It has the outline for how to register short cut keys that perform a specific action (e.g. register ctrl+d to delete the current row you are on, or press F11 to execute a query (similar to Oracle Forms frmres files)). However, be aware that this includes some code you have to write (actually quite some code to be honest).
http://www.oracle.com/technetwork/developer-tools/adf/learnmore/79-global-template-button-strategy-360139.pdf (are there an example implementation?), or
http://one-size-doesnt-fit-all.blogspot.dk/2010/11/adf-ui-shell-supporting-global-hotkeys.html
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Frank

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Best practice for mutable global variables

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