RE: [sca-bpel] Operations on SCA Contributions Containing BPELComponent Implementations

Title: [sca-bpel] Operations on SCA Contributions Containing BPEL Component
Implementations

 

+1!

 

From: Danny van der Rijn
[mailto:] 

Sent: Thursday, October 22, 2009 1:27 PM

To: Dieter Koenig1

Cc: 

Subject: Re: [sca-bpel] Operations on SCA Contributions Containing BPEL
Component Implementations

 

Yes, the SCA-BPEL spec should remain silent about these
scenarios.  SCA should say as little as possible about changes to the
runtime.  While it was necessary to resolve Assembly 138 this way in order
to talk about when an SCA error SHOULD or MUST be enforced, that's where it
should stop.

Dieter Koenig1 wrote: 

 

The SCA-Assembly
spec chapter 10 describes operations on SCA contributions

(10.4) and aspects of dynamic behavior (10.7, 10.8.). Moreover, the

SCA-Assembly issue 138 resolution (almost identical to the mail below)

introduces states of an SCA artifact and state transitions caused by SCA

operations.

Should the SCA-BPEL spec remain silent about these scenarios?

IMO it does make sense to describe whether and how long(!!!)-running BPEL

process instances are affected by actions like

-- Removing a contribution

-- Adding, removing, replacing wires

-- Changing the targets of a wire

-- Changing component property values

For example,

-- a contribution containing a BPEL process implementation must not be

removed as long as there are running process instances.).

-- it could be very helpful being able to replace a wire target for a

process instance that runs for many months, e.g. if the original wire

target became obsolete

Depending on the TC's reaction I would then open an issue ...

Kind Regards

Dieter König

Senior Technical Staff Member, WebSphere Process Server Architect

IBM Software Group, Application and Integration Middleware Software

WSS Business Process Solutions

                                                                                             

                                                                                             

                                                                                             

                                                                                             

                                                                                             

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----- Forwarded by Dieter Koenig1/Germany/IBM on 20.10.2009 17:38 -----.

                                                                                                                               

  From:       Mike Edwards <>                                                                           

                                                                                                                               

  To:         "OASIS
Assembly" <>                                                             

                                                                                                                               

  Date:       20.10.2009
16:20                                                                                                 

                                                                                                                               

  Subject:    [sca-assembly] [ISSUE 138] Assembly
specification unclear on Contribution vs Deployment - when can errors
in     

             
artifacts be reported? - Updated Proposal
2                                                                      

                                                                                                                               

Here is a proposal based on discussions that have taken place on the email

list and in prevoous TC calls:

Proposal:

Add a new section to the spec after line 3649 as follows:

11.3. States of Artifacts in the Domain

Artifacts in the SCA domain are in one of 3 states:

1. Installed

2. Deployed

3. Running

Installed artifacts are artifacts that are part of a Contribution that is

installed into the Domain.

Installed artifacts are available for use by other artifacts that are

deployed, See "install Contribution"

and "remove Contribution" to understand how artifacts are installed
and

uninstalled.

Deployed artifacts are artifacts that the SCA runtime is given to execute.

Artifacts are deployed

either through explicit deployment actions or through deployment actions

that act through

<deployable/> elements present in a sca-contribution.xml file within a

Contribution. If an artifact is deployed

which has dependencies on other artifacts, then those dependent artifacts

are also deployed.

When the SCA runtime has one or more deployed artifacts, the runtime

attempts to put those artifacts

and any artifacts they depend on into the Running state. This can fail due

to errors in one or more of the artifacts

or the process can be delayed until all dependencies are available.

11.3.1

Checking for errors in artifacts MAY be done for artifacts when they are

Installed (ie where the artifacts are

simply part of installed contributions] [ASM120xx]

Errors in artifacts SHOULD be detected during the Deployment of the

artifacts. [ASM120xx]

Errors in artifacts MUST be detected no later than the process of putting

the

artifacts into the Running state, [ASM120xx]

Yours,  Mike.

Strategist - Emerging Technologies, SCA & SDO.

Co Chair OASIS SCA Assembly TC.

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

Phone & FAX: +44-1962-818014    Mobile: +44-7802-467431

Email:  

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Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU

Unless stated otherwise above:

IBM United Kingdom Limited - Registered in England and Wales with number

741598.

Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU