To instantiate interfaces.

[Kai Kunstmann]

Hi,

There is a "Design Pattern" called "Strategy" for this kind of
behaviour. Have a look at Google's Guice library or the Spring Framework
for pluggable components.

Cheers,
Kai


Am Donnerstag, den 14.04.2011, 12:53 -0300 schrieb Davi Sáránszky
Mesquita:
> Maybe i am late, but i will love to receive critic's about this.
> 
> thansks,
> SMALL LANGUAGE CHANGE PROPOSAL FORM *AUTHOR(S):* Davi Saranszky Mesquita,
> SCJP 6.0
> 
> *OVERVIEW*
> Ability to instantiate interfaces using pre-implemented behavior.
> 
> When we have lots of factories and native implemented Java. Cloud and
> multi-platform implementations needs to creates factories and interface
> oriented programing.
> 
> For example: For the Google App Engine, we create an interface with
> pre-implemented behavior. When we ship this product to another platform, the
> only thing we need to do its using the same interface.
> 
> The excess of using this will result in bigger Jar libraries.
> 
> 
> *EXAMPLES*
> 
> 
> A TARGET 6 EXAMPLE:
> 
> // FILE: StoreFile.java
> 
> import java.io.File;
> 
> interface StoreFile {
> 
>  void doIt(File file);
> 
> }
> 
> // FILE: StoreFileImpl.java
> import java.io.File;
> class StoreFileImpl implements StoreFile {
>  public void doIt(File file) {
>  // DO MAJOR USER IMPLEMENTATION
>  }
> }
> 
> A TARGET 7 EXAMPLE:
> 
>  // FILE: StoreFile.java
> 
> import java.io.File;
> 
> interface StoreFile {
> 
>  void doIt(File file) {
>      public void doIt(File file) {
>      // DO MAJOR USER IMPLEMENTATION
>      }
>         }
> 
> }
> 
> At this point on target 7 example, we can instantiate the interface OR
> implements that for changing behaviors.
> 
> // FILE StoreFileGAE.java
> import java.io.File;
> class StoreFileGAE implements StoreFile {
> 
> void doIt(File file) {
>      public void doIt(File file) {
>      // DO Google App Engine NATIVE IMPLEMENTATION
>      }
>         }
> }
> 
> At this point. We can just does nothing for just instantiations interfaces.
> 
> The: new StoreFile();
> 
> just works.
> 
> For localhost or the major products but for this example we can ship to
> Google App Engine for changing the implementations.
> 
> This can be used for cloud storeges, cloud threads and task workers, for
> private grid and clustering like Cassandra or Haboop.
> 
> 
> 
> Davi
> +55 (11) 8180-9411 TIM
>