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1. The name of the Plugin should match the format FooJob. The
   1. For Registry v3.3.x, the prefix (eg: Foo) will be used as the job_type in cm_co_jobs
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   2.  As of Registry v4.0.0, Job Plugins are no longer required to follow the FooJob naming convention for the Plugin itself. This enables polymorphic Plugins. ie: Other types of Plugins can also implement Jobs.
2. For Registry v3.3.x, the The Plugin must implement a single model FooJob (in Model/FooJob.php)., where Foo matches the name of the Plugin.
3. For Registry v4.0.0 and later, the Plugin may implement multiple Job models, each of which follows the naming convention BarJob, where Bar may be any string.
   1. The main Plugin model (the model whose name matches the name of the Plugin) must implement an additional function:
      1. getAvailableJobs(), which returns an array whose keys are the prefixes for each defined Job, and whose values are help strings describing the Job.
4. Each Job This Model should extend CoJobBackend, which defines some standard interfaces and provides some behind the scenes common functionality.
   1. The Plugin Each Model must implement two functions, which are defined in this Model.:
      1. execute($coId, $CoJob, $params), which will be passed the relevant CO ID, a CoJob object, and an (optional) array of parameters in accordance with the Plugin's configuration.
         1. When the Job is started, it should call $CoJob->update() (with appropriate arguments).
         2. When executing, the Job should not typically generate output, but should instead create Job History records. If it is absolutely necessary to write to stdout, the Job should follow Cake's Console output levels.
         3. If the Job loops over multiple records, it should check $CoJob->canceled($jobid) after each iteration, and immediately terminate processing if the Job has been canceled.
         4. Jobs may provide a "percent complete" value so that the job status view page will generate a progress bar. Simply call $CoJob->setPercentComplete($jobid, $percent) at appropriate points during processing.
         5. When complete, the Job must call $CoJob->finish(), with appropriate arguments. (The Job will be set to started when dispatched, before the Plugin is invoked.)
      2. parameterFormat(), which returns an array of parameters supported by the plugin. Each entry in the array has a key of the parameter name and a value of an array with the following keys:
         1. choices: An array of permitted values for the parameter (when type is select)
         2. help: Help text for the parameter
         3. required: Boolean indicating whether or not this parameter is required
         4. type: One of int, select, or string.

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