[google-gin] Re: Comment on GinFaq in google-gin

[googl...@googlecode.com]

Comment by desprez.marine:

How to you use IN with MVP qnd JSON ? please


For more information:
http://code.google.com/p/google-gin/wiki/GinFaq

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Comment by desprez.marine:

It is possible to use GIN and GUICE with an application with GWT and JSON ?
thanks for your answer.

[googl...@googlecode.com]

Comment by wanjunfeng:

Currently, in my project, I'm using replace-with to handle some specific
implementations for gecko1_8. But with gin, I haven't found any way to do
it.

The scenario is like, I have RegisterPanel, and its subclasses
RegisterPanelStandard for other browsers and RegisterPanelGecko for firefox.

I have Module.java
public class Module extends AbstractGinModule
{
@Override
protected void configure()
{
bind(RegisterPanel.class).to(RegisterPanelStandard .class);
}
}

and ModuleGecko.java
public class ModuleGecko extends Module
{
@Override
protected void configure()
{
super.configure();
bind(RegisterPanel.class).to(RegisterPanelGecko .class);
}
}

and Injector.java

@GinModules(Module.class)
public interface Injector extends Ginjector
{
RegisterPanel getRegisterPanel();
}

and in myproject.gwt.xml, I added the following,

<replace-with class="com.topcmm.client.ModuleGecko">
<when-type-is class="com.topcmm.client.Module"></when-type-is>
<when-property-is name="user.agent" value="gecko1_8"></when-property-is>
</replace-with>

But I found it doesn't work for me. Anyone can explain it or how can I make
it work?

Appreciate for any comments!

[googl...@googlecode.com]

[googl...@googlecode.com]

Comment by vkubushyn:

Hey everyone,

We are trying to split out our codebase into multiple GWT modules with GIN
for dependency injections. A need arose for different Ginjectors to inherit
from other Ginjectors.

We found that this works:
{{{
@GinModules(ParentModule.class)
public interface ParentInjector extends ChildInjector, Ginjector{
public SomeClass getSomeClass();
}
}}}
and then the ChildInjector is like this:
{{{
@GinModules(ChildModule.class)
public interface ChildInjector extends Ginjector{
public SomeOtherClass getSomeOtherClass();
}
}}}
Now, we can get the SomeOtherClass instance by instantiating the parent
Ginjector:
{{{
ParentInjector injector = GWT.create(ParentInjector.class);
SomeOtherClass socInstance = injector.getSomeOtherClass();
}}}

This works fine, but I'm wondering whether we're overlooking any major
issues this could cause?

Any comments are appreciated!


For more information:
https://code.google.com/p/google-gin/wiki/GinFaq

[googl...@googlecode.com]

Comment by nat...@gmail.com:

@vkubushyn
i'm having the exact same problem.

[googl...@googlecode.com]

Comment by arashbi:

How does lazy instantiation works with jin?

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Comment by arashbi:

Can I inject a parametrized type to a class using jin?
I tried several approaches but I get error

[googl...@googlecode.com]

Comment by alex.moffat:

Sorry for answering a question in the comments but....

@arashbi Lazy instantiation works fine. You can see this by adding some
sort of message, such as Window.alert("XXX"), to the constructor of a class
created by gin. You will see that the message only appears when the
injector.xxx() method is called. By printing out hashCodes you can also
check that Singleton etc. works as you expect.

For parameterized types use the TypeLiteral class, take a look at the Guice
documentation for this.

[googl...@googlecode.com]

Comment by ste...@haebler.ch:

While working on a gin module in development mode, I often get
the "Deferred binding result type 'A' should not be abstract" error. After
restarting the development console, it's gone. Just a hint in case you run
into this one as well.

Debian, 2.6.26-2
Firefox 3.6.13
GWT 2.1.1
GIN 1.0

[googl...@googlecode.com]

Comment by aryzho...@gmail.com:

I have a question to Gin team:

In Guice, I specify the module when I am creating an injector. This is fine
because I can create two injectors with different modules, for testing
purposes.

In Gin, I must specify the module to use in the Injector interface via
@GinModules. So I cannot create two instances of the injector with
different modules. This creates a dependency from an interface to the
implementation and defeats the whole purpose of dependency injection.

Is there a way around it?

[googl...@googlecode.com]

Comment by aragos:

There are two ways to reuse Ginjectors. The classic way is to subclass
them, i.e. if the ginjector with all your methods is A, then have 2 (n)
ginjectors B and C, each of which extend A but which define different gin
modules.

Another way to easily swap the gin module names is to use GWT properties,
which was recently implemented. Take a look at
http://code.google.com/p/google-gin/source/browse/trunk/src/com/google/gwt/inject/client/GinModules.java
for some more documentation.

[googl...@googlecode.com]

Comment by narapi...@gmail.com:

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