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On 22-Dec-2011 15:01 , James Lampert wrote:
Given a program that, depending on circumstances, may or may not
call anything in a given service program to which it is linked,
is it possible to defer checking for the existence of the service
program until a call is made to it?
Deferred activation I think does that; specification is possible for
"the activation mode for a service program as either immediate or
deferred". Refer to the BNDSRVPGM parameter on one of several commands;
e.g. CRTPGM:
Element 2: Activation
*IMMED Activation of the bound service program takes place
immediately when the program being created is activated.
*DEFER Activation of the bound service program may be deferred
until a function it exports is called.
_Activation_
http://publib.boulder.ibm.com/infocenter/iseries/v7r1m0/topic/ilec/sc41560642.htm#activa
"
By default, service programs are immediately activated during the call
to a program that directly or indirectly requires their services. You
can request deferred activation for a service program when you are
binding an ILE program or a service program that is created for V6R1, or
later. If you request deferred activation for a service program, the
activation of a service program can be deferred until one of its
imported procedures is called. To minimize activation costs both at
program startup and throughout program execution, it is suggested that
you specify deferred activation for the service programs that satisfy
procedure imports and that are used only on infrequently traveled code
paths.
Notes:
1. If you request deferred activation for a service program that
satisfies a data import, partial immediate activation is required to
initialize the static data.
2. If you request deferred activation for a service program that
satisfies a procedure import for a procedure pointer call, partial
immediate activation is required to provide the binding for the
procedure pointer call.
"
_Create Program (CRTPGM)_
http://publib.boulder.ibm.com/infocenter/iseries/v7r1m0/topic/cl/crtpgm.htm
"
Bind service program (BNDSRVPGM)
Specifies the list of service program exports to examine at bind time to
ensure they satisfy any module import requests. <<SNIP>>
You can control the activation of each service program. You can specify
whether the referenced service program is activated at the same time as
the program program being created, or is deferred until a procedure
exported from the referenced service program is called. Deferring
activation may improve your application's performance.
"
Additionally, if they are defined as external functions [or external
procedures], then they can be invoked as a UDF [or CALL] via the SQL
without ever binding them. The existence is determined at run-time, but
for both the routine catalog entry and the external program to which the
routine refers. AFaIK a procedure which is merely declared within
embedded SQL [DECLARE PROCEDURE] can not refer to a Service Program;
i.e. the actual CREATE of the routine, either CREATE PROCEDURE or CREATE
FUNCTION would be required.
Regards, Chuck
midrange.com
