Thanks! It worked just fine with
@Provides
public QueryExecutor getQueryExecutor(Injector injector) {
final String name =
SolrMeterConfiguration.getProperty("executor.queryExecutor");
final Key<QueryExecutor> key = Key.get(QueryExecutor.class,
Names.named(name));
return injector.getInstance(key);
}
I dont know what you mean by "An depend on a Provider<QueryExecutor>
in your classes. ". My classes that use the QueryExecutor are unaware
of guice (only annotations are included). Anyway, it works perfect
with the @Provides method you suggested.
Thanks again.
On Aug 10, 10:47 am, Willi Schönborn <[email protected]>
wrote:
> On 10/08/10 14:42, Willi Sch nborn wrote:
>
> > On 10/08/10 14:23, tflobbe wrote:
> >> Hi Willi, my problem is that I need a different implementation of the
> >> QueryExecutor depending on the value of
> >> Configuration.getProperty("executor.queryExecutor"), and that value
> >> can change on runtime. If I just use:
> > Ah ok, i got it now.
>
> > Try in your module:
>
> > @Provides
> > public QueryExecutor getExecutor(Configuration config, Injector
> > injector) {
> > final String name = config.getProperty("executor.queryExecutor");
> > final Key<QueryExecutor> key = Key.get(QueryExecutor.class,
> > Names.named(name));
> > return injector.getInstance(key);
> > }
>
> I just realized that Configuration.getProperty is static. So the code
> above would be:
>
> @Provides
> public QueryExecutor getExecutor(Injector injector) {
> final String name =
> Configuration.getProperty("executor.queryExecutor");
> final Key<QueryExecutor> key = Key.get(QueryExecutor.class,
> Names.named(name));
> return injector.getInstance(key);
>
> }
>
> > An depend on a Provider<QueryExecutor> in your classes.
>
> > Hope that helps.
> >> @Inject
> >> public MyService(@Named("one") QueryExecutor executor) {
> >> ...
>
> >> then the implementation can't be modified on runtime, am I right?
>
> >> On Aug 9, 3:45 pm, Willi Sch nborn<[email protected]>
> >> wrote:
> >>> On 09/08/2010 15:55, tflobbe wrote:
>
> >>>> Hi All, I have the exact same problem as Tim in message
> >>>>http://groups.google.com/group/google-guice/browse_thread/thread/ee24...
>
> >>>> I tried using a provider method but it doesn't work either. I'm doing
> >>>> something like this:
> >>>> @Provides
> >>>> public QueryExecutor createQueryExecutor() {
> >>>> Key<QueryExecutor> executorKey = Key.get(QueryExecutor.class,
> >>>> Names.named(Configuration.getProperty("executor.queryExecutor")));
> >>>> Provider<QueryExecutor> provider = getProvider(executorKey);
> >>>> return provider.get();
> >>>> }
> >>>> On the same module, on the "configuration" method I bind the interface
> >>>> "QueryExecutor" to diferent implementations depending on the "Named"
> >>>> annotation.
> >>>> bind(QueryExecutor.class).annotatedWith(Names.named("one")).to(QueryExecutorImpl1.class);
>
> >>>> bind(QueryExecutor.class).annotatedWith(Names.named("two")).to(QueryExecutorImpl2.class);
>
> >>> Looks like your are binding using "one" and "two" but you try to
> >>> retrieve it using "executor.queryExecutor".
> >>> What's the use of that provides method anyway?
> >>> Can't you just use the following?
>
> >>> @Inject
> >>> public MyService(@Named("one") QueryExecutor executor) {
> >>> ...
>
> >>> }
> >>>> Can I use the provider from the provider method? It seems that the
> >>>> binder is null when the createQueryExecutor() method is called and
> >>>> that's causing a null pointer exception.
> >>>> Thanks
> >>>> Tom s
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