You can bubble the logic up to place that installs the modules. ie.,
have a MySqlModule, a PostgresqlModule, and a GenericDbModule and
conditionally insert one of those modules into the list of modules
that's passed to create the injector.
Sam
On Apr 4, 2010, at 1:23 PM, rod <[email protected]> wrote:
I don't think it's a really bad solution, I just read this page - http://code.google.com/p/google-guice/wiki/AvoidConditionalLogicInModules
- and wanted to check there wasn't a better way to do this.
Cheers,
rod.
On 4 April 2010 14:33, Max Bowsher <[email protected]> wrote:
rod wrote:
> Hi,
>
> I'm sure this question must have been asked a million times but I
> can't find the answer...
>
> In my application the user can provide command line flags for
various
> options, one being the type of database to use. So I have a bunch
of
> implementations of my Database interface, and at the moment on
startup
> I do...
>
> if ( dbType.equals("mysql") ) {
> // create mysql implementation
> }
> else if ( dbType.equals("other..") ) {
> // ...
> }
> else {
> // some other implementation...
> }
>
> The database class is then injected into components when needed.
How
> is this handled with Guice? The only way I can see is to move this
> logic to my module like this...
>
> if ( dbType.equals("mysql") ) {
> bind( Database.class ).to( MySQLDatabase.class );
> }
>
> Is there a better way?
What's wrong with the method that you describe above that you seek to
improve upon?
Max.
--
"I backed my car into a cop car the other day. But he just drove
on, sometimes life's ok."
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