在同一JVM中的远程EJB调用与本地EJB调用性能

Question

I was trying to find out if there is any difference when I am calling a service through its local interface / remote interface in performance within the same JVM.

Based on this article: http://www.onjava.com/pub/a/onjava/2004/11/03/localremote.html?page=last&x-showcontent=text Local call should be a bit faster especially in cases for Collection of Objects.

Based on my testing I could not find a big difference between the two however maybe I was trying it with small amount of data.

But anyway I would like to know if it has any downfall to call a service through its remote interface when we are in the same JVM because in my project we are generating both local/remote interfaces however there are no real remote calls, the client and the service is within the same JVM and I am thinking about cleaning up the mess and removing the unnecessary generated remote views because people started to use both without reason.

Thanks!

Answer 1

• implementation will vary between containers how remote interfaces perform, you cannot rely on it performing similar to local interfaces (though most containers will realize you're actually accessing a 'local' remote interface). There can be differences, like spawning a new thread for the remote call, passing values by reference (you can for example turn this on in jboss for in-vm remote calls), etc
• serialization is always slow, it should be avoided whenever possible
• basically just don't do it, absolutely no reason to use the remote interfaces unless you plan on splitting your application into multiple EARs