Re: How does the Jobs (JDBC and Program Call) on AS400 end?

Great answer Michael!  I will add just two things,

1. If the program does not end the connection via
AS400.disconnectService(), the connection is cleaned up when the AS400
object is garbage collected.  That will always happen when the JVM
terminates.  It can happen earlier if there are no more references to a
particular AS400 object and the garbage collector runs.

2. The program call is blindly synchronous.  Your program does not get
control back from ProgramCall.run() until the AS/400 program ends normally,
ends abnormally, or the Toolbox object is notified that the connection
dropped.  (Notice the careful wording of the last condition.  The
ProgramCall object sends a run program request to the AS/400 then does a
socket read waiting for the reply.  If a comm failure occurs the JVM and
TCP stacks must bubble the error to the socket the Toolbox is reading from.
This is usually reliable but not 100% perfect on all JVMs)   If the AS/400
program takes 8 hours to run, your thread is blocked at ProgramCall.run()
for that entire time.

David Wall
AS/400 Toolbox for Java


Michael hawes <mihawes@yahoo.com> on 05/05/2000 04:14:32 AM

Please respond to JAVA400-L@midrange.com

To:   JAVA400-L@midrange.com
cc:
Subject:  Re: How does the Jobs (JDBC and Program Call) on AS400 end?




Hi,
The creation of the server jobs is controlled by the
use of an 'AS400' class object which is required by
every instance of a class that accesses an AS400 for
example Program call or JDBC. You have the ability to
control the time of connection programatically via
this AS400 object, see: connect(String) or
connect(int) ), or allow the connection to be made
automatically when you utilize the connection class
object(e.g. JDBC). Each AS400 object will represent a
separate job on the AS/400. You can either share one
or use seperate ones for seperate jobs.

You can programmatically end the connection via:
disconnectService(int) or disconnectAllServices().
These will end the AS400 jobs.

The AS400 jobs will terminate when the connection to
the client ends, i.e. the JVM terminates.


See
http://publib.boulder.ibm.com/pubs/html/as400/v4r4/ic2924/info/java/rzahh/toolbox.htm

for a good description of the AS400 object and access
classes.


--- "AnanthaRamaiah, Gururaja (CTS)"
<AGururaj@chn.cts-corp.com> wrote:
> Hi,
> I have a very basic doubt. I want to know when
> exactly the AS400 server Job
> gets created for JDBC and program Call classes. Also
> when will they get
> ended?.. Does the system takes care of ending it
> automatically or can we end
> it programatically?..
>
> what happens  when if the program ends abnormally..
> or it waits for resource
> for a long time.
>
> Can anyone help me out in getting my doubt
> cleared...
>
> Thanks in advance,
> Gururaj
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