[Query] Worker callbacks option

[slahiri]

I was going through the worker code and the options take a parameter as callback. Looking at the process code, it tries to find the callback for a particular job.data.name. @scttnlsn if you can help explain the use-case of this functionality?

[scttnlsn]

The worker callbacks are keyed by name and should correspond to the values in job.data.name. The callbacks perform the actual computation/work and by naming the callbacks, a single worker can perform various tasks based on the name of the enqueued job. Does that answer your question?

[slahiri]

Still trying to figure out. Can you share an example?

[scttnlsn]

Example from the README:

A job named reverse is enqueued. This sets job.data.name to the string "reverse" in the job document. A worker function is then registered corresponding to the name:

worker.register({
  reverse: function (params, callback) {
  }
});

You could register as many functions as you need though:

worker.register({
  reverse: ...,
  capitalize: ...,
  lowercase: ...,
  // etc.
});

And enqueue jobs to be processed by those functions respectively:

queue.enqueue('reverse', { text: 'foobar' });
queue.enqueue('capitalize', { text: 'foobar' });
queue.enqueue('lowercase', { text: 'FOOBAR' });

[slahiri]

This is brilliant. Thanks.