Re: [sca-assembly] NEW ISSUE: Need an equivalent to "autowire" for theeventing world

Logged as:  http://www.osoa.org/jira/browse/ASSEMBLY-250

Yours,  Mike.

Strategist - Emerging Technologies, SCA & SDO.

Co Chair OASIS SCA Assembly TC.

IBM Hursley Park, Mail Point 146, Winchester, SO21 2JN, Great Britain.

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From:
Eric Johnson <>

To:
OASIS SCA Assembly <>

Date:
29/10/2010 00:43

Subject:
[sca-assembly] NEW ISSUE: Need an equivalent
to "autowire" for the eventing world

Title: Need an equivalent to "autowire"
for the eventing world

Target: Assembly 1.2 WD 01

Description:

With the references and services of SCA Assembly, the spec currently 

supports the notion of "autowire".  Whatever the merits
in the service 

space, this concept fits even more naturally into the eventing world.

The use case: Forcing users to explicitly wire up all of the producers

and consumers may be over-determined.  That, is, given the exact 

specification of which events a consumer is interested in, and the 

events that a producer sends out, that should be sufficient to wire 

them.  Making this situation worse, users might have to go through
the 

error prone effort of specifying which channels are required to connect

to which producers, and possibly missing out, or incorrectly wiring in
a 

few cases.

One distinction to draw in the "autowire" of producers and consumers
in 

the eventing world is that it may be very useful to have auto-wired 

consumers and producers cross composite boundaries.  Some notion of

"scope" might be appropriate.  Two forms of scope probably
make sense:

- one bounded by the presence of a parent composite

- the other tied to some notion of intent.  For example, I want scope

"sales", or "sales, northamerica", or "manufacturing,
europe"

Abstract proposal:

Add to a component producer, and a component consumer an attribute 

@autowire (true/false).  The presence of @autowire true prevents the
use 

of the @target, and @source attributes.  Also add an @autowireIntent

attribute, which includes a space separated list of tags/intents to pair
up.

In conjunction with autowiring, a producer must declare the exact set of

events it produces, and a consumer must declare the exact set it consumes.

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