On Mon, Jan 24, 2011 at 1:35 AM, sunny...@gmail.com <sunny...@gmail.com> wrote:
> Hi all, I've been getting my head around DI/gin/guice lately....
>
> Here is a really simple widget:
>
> public class UserForm extends DynamicForm implements UserFormInterface
> {
>
> private TextItem txtUsername;
> private TextItem txtFirstname;
> private TextItem txtSurname;
>
> @Inject
> private UserForm(TextItem txtUsername, TextItem txtFirstname,
> TextItem txtSurname) {
>
> this.txtUsername = txtUsername;
> this.txtFirstname = txtFirstname;
> this.txtSurname = txtSurname;
>
> this.txtUsername.setTitle("Username");
> this.txtFirstname.setTitle("Firstname");
> this.txtSurname.setTitle("Surname");
>
> this.setShowEdges(true);
> this.setFields(this.txtUsername, this.txtFirstname,
> this.txtSurname);
> }
>
> @Override
> public String getUsername() {
> return txtUsername.getValueAsString();
> }
>
> @Override
> public String getFirstname() {
> return txtFirstname.getValueAsString();
> }
>
> @Override
> public String getSurname() {
> return txtSurname.getValueAsString();
> }
>
> }
>
> public interface UserFormInterface {
> String getUsername();
> String getFirstname();
> String getSurname();
> void draw();
> }
>
> ginjector:
> @GinModules(MyWidgetClientModule.class)
> public interface MyWidgetGinjector extends Ginjector {
> UserFormInterface getUserForm();
> }
>
> And module:
> public class MyWidgetClientModule extends AbstractGinModule {
> @Override
> protected void configure() {
>
> bind(UserFormInterface.class).to(UserForm.class).in(Singleton.class);
> }
> }
>
>
>
> In such simple cases (eg, when coding a composite widget), is there
> any point in using GIN? Where would one draw the line and say 'oh I
> really should've done it the other way instead?'
It's a matter of taste.
My recommendation: If you have a small and tiny app that you don't
want to test and extend: Don't use Gin.
All other cases: Use Gin. It makes your code structure more modular,
maintainable and more testable.
At the beginning dependency injection might sound like a strange and
complex thing. But it is not. It's simple and straight forward once
you got the concepts.
Cheers,
Raphael
>
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