Re: https://issues.jboss.org/browse/ISPN-2029

Just a heads up as a result of an interesting discussion with Paul Ferraro last 
night:

So far Externalizer interface has extended Serializable and last night I was 
trying to wonder why that was. 

As you guys might remember (https://docs.jboss.org/author/x/PwY5), there's two 
type of externalizers: user friendly and advanced.

The user friendly ones do not require any pre-registration or anything and 
thanks to the ability of JBMAR to ship Externalizers to remote nodes, we can 
support such use case. However, this requires Externalizer impls to be 
Serializable or Externalizable somehow.

However, that requirement is not there for advanced externalizers cos these 
must be registered somehow, either via programmatic or XML configuration, so in 
these case there's no shipping of Externalizer impls at all.

So, I'm gonna remove 'implements Serializable' from 
org.infinispan.marshall.Externalizer and instead require that any user-friendly 
externalizers are marker as Serializable or similar.

I'll be making this change in master, but what about 5.1.x? This change is not 
urgent but clarifies what the externalizer serialization requirements are.

Cheers,
--
Galder Zamarreño
Sr. Software Engineer
Infinispan, JBoss Cache


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