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From Bryan Thompson <br...@systap.com>
Subject Re: [Discuss] Drop support for Activation?
Date Fri, 13 Nov 2015 19:21:15 GMT
I was trying to remember precisely what is in "activation".  I found this
[1]. From [1]:

"Distributed object systems are designed to support long-lived persistent
objects. Given that these systems will be made up of many thousands
(perhaps millions) of such objects, it would be unreasonable for object
implementations to become active and remain active, taking up valuable
system resources for indefinite periods of time. In addition, clients need
the ability to store persistent references to objects so that communication
among objects can be re-established after a system crash, since typically a
reference to a distributed object is valid only while the object is active."

So the concept here was long lived object references and robustness of
those references.

This all seems very appropriate for IoT, but perhaps the goal of such
durable / robust / on demand (re-)activation of services is now met through
other mechanisms?  Something that does not need to be part of River?



Bryan Thompson
Chief Scientist & Founder
4501 Tower Road
Greensboro, NC 27410

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On Fri, Nov 13, 2015 at 10:21 AM, Greg Trasuk <trasukg@trasuk.com> wrote:

> Hello all:
> Last week I asked about removing activation from River, both the 2.2 and
> 3.0 branches.  There didn’t seem to be a lot of anti-removal feeling, so
> I’d like to formally propose removing Activation.  There are a couple of
> other things that we could possibly remove, like JRMP support (i.e.
> pre-compiled proxy classes), but we should probably discuss those
> separately.
> The main reason for this is that unused code still requires maintenance
> and increases the chance of bugs.  Also I think that as we go forward with
> refactoring, renaming, restructuring the build and so on, it seems wasteful
> to do that work on code that isn’t actually in use.
> Obviously, the code remains in Subversion and in the 2.2.2 release, so if
> someone wants to get it back, we (or they) could package it into a
> different deliverable.  But I wouldn’t plan on doing that unless there’s
> actual demand for it.
> My thought is to put this out there for discussion - If there is consensus
> after a few days I’ll call a lazy-consensus vote.   I’ll be happy to do the
> work in the 2.2 branch.
> So, I propose to drop support for the following:
> Activation -
>         com.sun.jini.phoenix.*
>         com.sun.jini.phoenix.resources.*
>         net.jini.activation.*
> Norm / LeaseRenewalService - is pretty much unneeded without activation
>         com.sun.jini.norm.**
> Activatable implementation of the infrastructure services
>         com.sun.jini.fiddler.ActivatableFiddlerImpl
>         com.sun.jini.mahalo.ActivatableMahaloImpl
>         com.sun.jini.mercury.ActivatableMercuryImpl
>         com.sun.jini.reggie.PersistentRegistrarImpl
> Starter for Activatable Services
>         com.sun.jini.start.ActivateWrapper
>         com.sun.jini.start.SharedActivatableServiceDescriptor
>         com.sun.jini.start.SharedGroupImpl
> QA Harness classes that test any of the above.
> Cheers,
> Greg Trasuk

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