RE: Controlled shutdown of a Java "daemon"

["Fred Kulack" <kulack@xxxxxxxxxx>]

Dedicate a thread to using a native method with
the QUSRJOBI or QWCRTVCA APIs to retreive
the 'End Status' information.
If the job is ending the native method
This will solve your subsystem never ending problem.
Although remember, System.exit() is not really 'orderly'.
8-)

Here's an example C program that polls every 5 seconds.
Replace main() with your native method, and have it
throw an exception or return a specific return code to the JVM.

#ifdef __AIXxiCC__
#include <qusrjobi.cleinc>
#include <qusec.cleinc>
#else
#include <qusrjobi.h>
#include <qusec.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int isEndJobControlled(void);

int main(int argc, char **argv)
{
  while (1) {
    printf("Checking for *CNTRL'd endjob\n");
    if (isEndJobControlled()) {
      printf("Bailing. Someone did endjob *CNTRL'd\n");
      exit(0);
    }
    printf("Sleeping for a bit\n");
    sleep(5);
  }
  return 0;
}

int isEndJobControlled(void)
{
  Qwc_JOBI0600_t                info;
  Qus_EC_t                      errorCode = { sizeof(errorCode), 0 };

  memset(&info, 0, sizeof(info));

  QUSRJOBI(&info, sizeof(info),
           "JOBI0600",                   /* Format of returned Data     */
           "*                         ", /* This job                    */
           "                ",           /* Unused                      */
           &errorCode);                  /* Error Code                  */

  if (errorCode.Bytes_Available != 0) {
    printf("Error on QUSRJOBI, <%.7s>\n", errorCode.Exception_Id);
    return 1;
  }
  /* The End_Status field describes if the job is in a controlled       */
  /* End state                                                          */
  if (info.End_Status[0] == '1') {
    return 1;
  }
  return 0;
}



"The stuff we call "software" is not like anything that human society
  is used to thinking about. Software is something like a machine, and
  something like mathematics, and something like language, and
  something like thought, and art, and information...
  but software is not in fact any of those other things."
Bruce Sterling - The Hacker Crackdown

Fred A. Kulack  -  AS/400e  Java and Java DB2 access, Jdbc, JTA, etc...
IBM in Rochester, MN  (Phone: 507.253.5982   T/L 553-5982)
mailto:kulack@us.ibm.com   Personal: mailto:kulack@bresnanlink.net
AOL Instant Messenger: Home:FKulack  Work:FKulackWrk

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