Re: [sca-j] ISSUE 96: Proposal - "Are annotations allowed on static methods?"

[Mike Edwards <mike_edwards@uk.ibm.com>]

+1

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:  mike_edwards@uk.ibm.com

From:	C Vamsi <vamsic007@in.ibm.com>
To:	sca-j@lists.oasis-open.org
Date:	11/12/2008 12:02
Subject:	[sca-j] ISSUE 96: Proposal - "Are annotations allowed on static methods?"

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ISSUE: Are annotations allowed on static methods?

PROPOSAL: SCA annotations are not allowed on static methods and static
fields.  Add the following text at the end of line 872 (
sca-javacaa-1.1-spec-cd01, section 8).

As a general rule, SCA annotations are not allowed on static methods and
static fields.  It is an error to use an SCA annotation on a static
method
or a static field of an implementation class and the SCA runtime MUST NOT
instantiate such implementation class.


RATIONALE:
The following are the SCA annotations that could be applied on static
fields and methods. The text next to each annotation explains a reason
for
disallowing the annotation.
@AllowsPassByReference - On service method of remotable service. Does not
     make sense since remotable service methods can not be static.
@Callback - The callback is per implementation instance and since static
     methods can only access static methods and fields
@ComponentName - Will be a problem since we don't restrict that an
     implementation can be used at most once in an assembly.
@Context -  Will be a problem since we don't restrict that an
     implementation can be used at most once in an assembly.
@ConversationID  - Will be a problem since we don't restrict that
an
     implementation can be used at most once in an assembly.
@Destroy -  Since this is invoked for each implementation instance
going
     out of scope and since static methods can only access static
methods
     and fields.
@EndsConversation - Not applicable since it is applied only on interface
     methods.
@Init -  Since this is invoked for each implementation instance coming
into
scope and since static methods can only access static methods and fields.
@OneWay - Applied on service method and service method cannot be static.
@Property - Will be a problem since we don't restrict that an
     implementation can be used at most once in an assembly.
@Reference - Will be a problem since we don't restrict that an
     implementation can be used at most once in an assembly.


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