NAME

TaskForest::Job - A representation of a program that can be run by the operating system

SYNOPSIS

 use TaskForest::Job;

 $job = TaskForest::Job->new(name => $job_name);
 # now $job->{status} eq 'Waiting'
 # and $job->check() == 0

DOCUMENTATION

If you're just looking to use the taskforest application, the only documentation you need to read is that for TaskForest. You can do this either of the two ways:

perldoc TaskForest

OR

man TaskForest

If you're a developer and you want to understand the code, I would recommend that you read the pods in this order:

• TaskForest
• TaskForest::Job
• TaskForest::Family
• TaskForest::TimeDependency
• TaskForest::LogDir
• TaskForest::Options
• TaskForest::StringHandleTier
• TaskForest::StringHandle

Finally, read the documentation in the source. Great efforts have been made to keep it current and relevant.

DESCRIPTION

A job is a program that can be run. It is represented as a file in the files system whose name is the same as the job name. Most of the manipulation of the attributes of jobs is done by objects of type TaskForest::Family.

A job name may only contain the characters a-z, A-Z, 0-9, and '_'.

When a job is run by the run wrapper (bin/run), two status files are created in the log directory. The first is created when a job starts and has a name of $FamilyName.$JobName.pid. This file contains some attributes of the job. When the job completes, more attributes are written to this file. See the list of attributes below.

When the job completes, another file is written to the log directory. The name of this file will be $FamilyName.$JobName.0 if the job ran successfully, and $FamilyName.$JobName.1 if the job failed. In either case, the file will contain the exit code of the job (0 in the case of success and non-zero otherwise).

The system tracks the following properties of a job:

• Status.

  Valid status are:

  • Waiting

    One or more dependencies of the job have not been met

  • Ready

    All dependencies have been met; the job will run the next time around.

  • Running

    The job is currently running

  • Success

    The job has run successfully

  • Failure

    The job was run, but the program exited with a non-zero return code

• Return Code

  The exit code of the program associated with the job. 0 implies success. Anything else implies failure.

• Time Zone

  The time zone with which this job's time dependency is tracked.

• Scheduled Start

  The scheduled start time of the job, as specified in the family config file. This is to be interpreted with the timezone above.

• Actual Start

  The time that the job actually started (in the timezone above).

• Stop Time

  The time that the job completed (succeeded or faild).

METHODS

new()

 Usage     : my $job = TaskForest::Job->new();
 Purpose   : The Job constructor creates a simple job data
             structure.  Other classes will set and examine status
             and return code. 
 Returns   : Self
 Argument  : None
 Throws    : "No job name specified" if the required parameter "name"
             is not provided. 

check()

 Usage     : $job->check();
 Purpose   : Checks to see whether the job succeeded.  Implies that
             it has already run.
 Returns   : 1 if it succeeded.  0 otherwise.
 Argument  : None
 Throws    : Nothing