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:
@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 Schönborn <[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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