To instantiate interfaces.

[Neal Gafter]

Davi-

Please see the "defender methods" part of project lambda, proposed for
inclusion in Java 8.

Cheers,
Neal

2011/4/14 Davi Sáránszky Mesquita <davimesquita at gmail.com>

> 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
>
>