Log "Failed to obtain lock" msgs for baseline

Question

Hi All,
Presently , I have a system for logging baseline success and failure msgs through a java program . But if the baseline fails to obtain lock before run,(in cases where during last run , lock may not have been released) , it is logging that also as baseline successfully completed. Hence i require to get a "failure to obtain lock" message or just a regular failure message like in other cases. This would help in tracking such issues . I would like to know where to put the check for this and what should be the check . Thanks a lot.
Regards,
Anuj

Answer 1

The common pattern here is to add to the else statement to the BaselineUpdate script to do something extra with the failure to get the lock. For example, on other threads in this forum have mentioned using a mailer class to generate email messages. I have also seen implementations implement a wait function.
Here is an example mailer modification:
<script id="BaselineUpdate">
<log-dir>./logs/provisioned_scripts</log-dir>
<provisioned-script-command>./control/baseline_update.sh</provisioned-script-command>
<bean-shell-script>
<![CDATA[
    log.info("Starting baseline update script.");
    // obtain lock
    if (LockManager.acquireLock("update_lock")) {
      if (LockManager.acquireLock("baseline_data_ready")) {
... code snipped ...
        } else {
log.warning("Baseline data not ready for processing.");
Mailer.sendSimpleMsg("Baseline update failed", "Failed to obtain baseline_data_ready lock - means that the incoming data is not ready.");
// release lock
LockManager.releaseLock("update_lock");
log.info("Baseline update script finished.");
} else {
log.warning("Failed to obtain lock.");
Mailer.sendSimpleMsg("Baseline update failed", "Failed to obtain update_lock - may mean that another baseline is running or stalled.");
Edited by: TimK on May 7, 2013 10:48 AM