Retry Logic But In Cron Post: 303046120

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Top Forums UNIX for Beginners Questions & Answers Retry Logic But In Cron Post 303046120 by jgt on Friday 24th of April 2020 10:58:49 AM

04-24-2020

Registered User

In the following, the index file is placed in the requests directory, and the image file in the temp directory. The index files can have different extensions to indicate grouping or priority.
The pid file is used to prevent subsequent invocations of the cron job from running.
You can periodically examine the contents of the temp and request directories for entries that older than some specified time.

Code:

#!/bin/ksh
cd /u/email
BATCH=$1
proc=$$
if [ -r /u/email/$BATCH.pid ]
then
    echo "Previous batch  still running" $(cat $BATCH.pid)
    exit
fi
echo $proc >/u/email/$BATCH.pid
list=$(ls requests|grep $BATCH)
if [ "$list" != "" ]
    then
    for request in $list
    do
    #do processing here          
    #if successful 
        mv requests/$request done
        mv temp/$request* done
    #else
       #echo "This one failed"
       #fi
    done
fi
rm /u/email/$BATCH.pid
echo finished at $(date)

jgt

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file::pid

File::Pid(3pm)						User Contributed Perl Documentation					    File::Pid(3pm)

NAME

       File::Pid - Pid File Manipulation

SYNOPSIS

	 use File::Pid;

	 my $pidfile = File::Pid->new({
	   file => '/some/file.pid',
	 });

	 $pidfile->write;

	 if ( my $num = $pidfile->running ) {
	     die "Already running: $num
";
	 }

	 $pidfile->remove;

DESCRIPTION

       This software manages a pid file for you. It will create a pid file, query the process within to discover if it's still running, and remove
       the pid file.

       new

	 my $pidfile = File::Pid->new;

	 my $thisfile = File::Pid->new({
	   file => '/var/run/daemon.pid',
	 });

	 my $thisfileandpid = File::Pid->new({
	   file => '/var/run/daemon.pid',
	   pid	=> '145',
	 });

       This constructor takes two optional paramters.

       "file" - The name of the pid file to work on. If not specified, a pid file located in "File::Spec->tmpdir()" will be created that matches
       "(File::Basename::basename($0))[0] . '.pid'". So, for example, if $0 is ~/bin/sig.pl, the pid file will be /tmp/sig.pl.pid.

       "pid" - The pid to write to a new pidfile. If not specified, $$ is used when the pid file doesn't exist. When the pid file does exist, the
       pid inside it is used.

       file

	 my $pidfile = $pidfile->file;

       Accessor/mutator for the filename used as the pid file.

       pid

	 my $pid = $pidfile->pid;

       Accessor/mutator for the pid being saved to the pid file.

       write

	 my $pid = $pidfile->write;

       Writes the pid file to disk, inserting the pid inside the file.	On success, the pid written is returned. On failure, "undef" is returned.

       running

	 my $pid = $pidfile->running;
	 die "Service already running: $pid
" if $pid;

       Checks to see if the pricess identified in the pid file is still running. If the process is still running, the pid is returned. Otherwise
       "undef" is returned.

       remove

	 $pidfile->remove or warn "Couldn't unlink pid file
";

       Removes the pid file from disk. Returns true on success, false on failure.

       program_name

       This is a utility method that allows you to determine what "File::Pid" thinks the program name is. Internally this is used when no pid file
       is specified.

SEE ALSO

       perl.

AUTHOR

       Casey West, <casey@geeknest.com>.

COPYRIGHT

	 Copyright (c) 2005 Casey West.  All rights reserved.
	 This module is free software; you can redistribute it and/or modify it
	 under the same terms as Perl itself.

perl v5.8.8							    2008-04-05							    File::Pid(3pm)