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Re: [emf-dev] EMF interface instance access pattern
  • From: Simon Schwichtenberg <simon.schwichtenberg@xxxxxx>
  • Date: Tue, 9 Jul 2019 13:03:00 +0200
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Hi,

CrossEcore's Java API might be interesting for you because the interfaces do not reference their implementations, e.g. see EcorePackageImpl.eINSTANCE:

https://github.com/crossecore/ecore-java/blob/master/src/Ecore/EcorePackageImpl.java

CrossEcore's Java API is more or less identical to the EMF API and should be also compatible with the EMF API (see for example https://github.com/crossecore/ecore-java/blob/master/src/Ecore/EObjectBase.java).

I am not sure if the CrossEcore Java API *never *uses the interface instance access pattern. However, I *am* sure that CrossEcore's C# API never uses the interfaces instance access pattern because in C# you cannot have fields on interfaces. Thus, you might have a look on the C# API as well.


Best regards,

Simon

Am 09.07.2019 um 12:11 schrieb Alexander Fedorov:
Thanks, this is exactly that I'm looking for!
Unfortunately this link works extremelly slow for me and I still unable to see the page.

Probably you know some alternative URL?

Thanks,
AF

09.07.2019 12:58, Pierre-Charles David пишет:
On 09/07/2019 11:27, Alexander Fedorov wrote:
Hello,

Hi,



In EMF runtime and generated code there is a "interface instance access" pattern like:

  public interface Registry
  {
    public static final Registry INSTANCE = new RegistryImpl();
  }

It is good and stable. It works perfect.
However, it may look "too static" for OSGi-based approach where interface should not reference its implementation.

How would you implement it today for OSGi-oriented architecture executed by 1.8+ Java?


You might be interested in this presentation [1] from Mikael Barbero (presented at EclipseCon 2012), which tried to imagine what a more modern/dynamic/OSGi-compatible version of EMF could look like if backward compatibility was not an issue (it is). It tackled this particular issue, among others.

Regards,
Pierre-Charles David

[1] https://fr.slideshare.net/mikaelbarbero/3mf-infinityandbeyond

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