Hi Olivier,
I am still having trouble understanding how to contextualize a module with
some data, whether value objects or not. Here is my attempt (I am a long
way from being able to test it):
public class MurmurModule extends AbstractModule {
private final WhisperIdentity serverId;
public MurmurModule(String nickname, String hostname, Integer port) {
TcpIdentity tcpId = new TcpIdentity(hostname, port);
this.serverId = new WhisperIdentity(nickname, tcpId);
}
@Override
protected void configure() {
bind(WhisperIdentity.class).toInstance(serverId);
bind(SwissTable.class);
bind(MurmurServer.class);
bind(MurmurTerminal.class);
}
}
So I pass in the context by values, build an instance of a non-value class,
and bind to that instance within the scope of this module. I can
instantiate more than one module. When I build an injector from each
instance of the module, that injector gets appropriately contextualized. Is
the the best way to go? Are there other good ways to go, perhaps with Guice
properties or something?
Regarding AssistedInject, from the wiki page, how does the Date and Money
get passed in? It is the same problem, but one layer of indirection over,
isn’t it?
Thanks,
Rob
From: [email protected] [mailto:[email protected]]
On Behalf Of Olivier Grégoire
Sent: Tuesday, October 09, 2012 5:39 PM
To: [email protected]
Subject: Re: injecting contextual parameters - newbie alert
Hi,
Two things on that topic.
1. Usually, value objects shouldn't be created by Guice. The keyword "new"
is still very useful for that.
2. If you still have to inject that, try using the assisted injection
extension. Take a look at it here:
http://code.google.com/p/google-guice/wiki/AssistedInject
Regards,
Olivier
2012/10/9 Rob Withers <[email protected]>
I am somewhat familiar with Guice and am reading the wiki, but I have a
question.
Let's say I have a Person class, with a constructor that takes a name. How
can I use a Guice module to create 2 instance, one with "Rob" and one with
"Sara"? Are there different approaches? What are the implications, pros
and cons of each approach?
Thanks,
Rob
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