Hi, Brandon.
jclouds is a heavy user of guice and internally uses about 350 classes
(excluding unit tests). The way we work is that we create a context into
our framework, which implies creation of an injector. Where needed
(rarely), Injectors are injected into classes.
Getting this context is performed one of two ways:
1. Builder that accepts external parameters like Guice constants or other
Guice Modules needed, then builds an injector from them.
Ex.
> public Injector buildInjector() {
>
> useDefaultPortIfNotPresent(properties);
>
> addLoggingModuleIfNotPresent(modules);
>
> addParserModuleIfNotPresent(modules);
>
> addConnectionModuleIfNotPresent(modules);
>
> addHttpModuleIfNeededAndNotPresent(modules);
>
> addExecutorServiceIfNotPresent(modules);
>
> modules.add(new AbstractModule() {
> @Override
> protected void configure() {
> Names.bindProperties(binder(), checkNotNull(properties,
> "properties"));
> }
> });
> addContextModule(modules);
>
> * return Guice.createInjector(modules);*
> }
>
2. Static factory method that creates a context with minimum input using
the above builder.
* public static S3Context createS3Context(String awsAccessKeyId, String
> awsSecretAccessKey,
> Module... modules)* {
> return S3ContextBuilder.newBuilder(awsAccessKeyId,
> awsSecretAccessKey).withModules(modules)
> .buildContext();
> }
>
I hope this helps.
Cheers,
-Adrian
jclouds <http://code.google.com/p/jclouds/>
On Fri, Aug 7, 2009 at 7:56 AM, Brandon Atkinson <
[email protected]> wrote:
> I'm looking for a little guidance on cleanly architecting a Guice based
> project.
>
> I'm new to DI and Guice, but after reading the docs and the Apress Guice
> book, I'm still a bit confused about how to architect applications to use
> Injectors properly. Is it common practice to have only a single Injector
> for an application, and pass the Injector around? If so, should I be
> injecting the injector, or using an application wide static factory method?
> What might be helpful is an example of a cleanly implemented Guice project
> that is larger than two or three classes.
>
> Looking for a little guidance...
>
> -Brandon
>
> >
>
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