Comment #4 on issue 231 by limpbizkit: Support mixed injection and manual
wiring
http://code.google.com/p/google-guice/issues/detail?id=231
Plan:
We'll Introduce a special binding annotation called '@New'. It is an error
to bind to @New by hand; ie. it's an
error to do this:
bind(Foo.class).annotatedWith(New.class).to(...)
When an injection point asks for an @New Foo, we create a default binding
for the constructor of Foo. Foo
must always be a concrete class with a Guice-invokable constructor (ie.
@Inject or public no-args).
Complications:
What happens if Foo.class is annotated @Singleton? Do I get the same
instance each time I inject @New Foo?
Or different ones?
Suppose I inject both Foo and @New Foo. If Foo.class is annotaed
@Singleton, do I get the same instance?
SPI Considerations:
I'm tempted to make it so @New is 1:1 with constructor bindings. For
example, given this code:
bind(Bar.class).to(BarImpl.class);
Guice would create 3 bindings:
Bar.class linked to BarImpl.class (explicit)
BarImpl.class linked to @New BarImpl.class (default)
@New BarImpl to its own constructor (built-in)
Syntactic Sugar:
We confound linked bindings and constructor bindings in the current Guice.
It means you can't solve the
turkey bacon problem [http://tinyurl.com/turkeybaconproblem]. So I'd like
to introduce some syntactic sugar
related to @New:
bind(Bar.class).toConstructor(BarImpl.class);
is syntactic sugar for:
bind(Bar.class).to(Key.get(BarImpl.class, New.class));
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