Hi all
I'm new to Guice. We have one small application that runs in batch
mode; it's a console application that is launched via main() method.
And here comes the questions
1. Bootstraping
I've seen that I need an Injector to get injected classes, but how
coud I achieve this? If I create an injector in the main() method it
isn't available to other classes, I mean, I must create Injectors in
every class I need it?
With Spring or in a web environment the injector is accesible from
almost everywhere, but with console or batch applications it's very
easy to fall in creating some kind of factory class with a static
injector in with all modules registered.
Is there a better approach?
2. Replacing factories
I think I'm missing some point here. I can't see how can I get rid of
typical factories with Guice: I can't see how replace factories based
on input parameters :-?
public class ServiceFactory {
public static IService getServiceByKey(String key) throws
Exception {
for (ServiceKey k: ServiceKey.values()) {
if (key.equalsIgnoreCase(k.getKey())) {
Class<?> klass = Class.forName(k.getKlass());
return (IService) klass.newInstance();
}
}
throw new Exception();
}
}
interface IService { ... }
class A implements IService { ... }
class B implements IService { ... }
enum ServiceKey {
ONE ("one", "org.testorg.A"),
TWO ("two", "org.testorg.B");
private final String key;
private final String klass;
ServiceKey(String key, String klass) {
this.key = key;
this.klass = klass;
}
public String getKey() { return key; }
public String getKlass() { return klass; }
}
Perhaps this questions sound like "too newbie" but I'm beggining with
Guice and D-I.
Thanks
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