joebear

Joebear

Joebear is a cute small serial queue job manager

Joebear receives an array of elements (any) and will let you process each element to which ever task is needed.

Joebear can

• Manage your jobs as a serial queue
• Call the next job in queue, when current is complete
• Reset current job in queue in case of an error
• Stop in any given time
• Follow current job in queue
• Give a cute summary when finished 🐻

Usage

Install npm install --save joebear

Examples source available in the examples directory.

Simple Example

/* Joebear simple example */
const Joebear = require('joebear');
const myJobs = new Joebear(['A','B','C',100]);

myJobs.on('err', (error) => {
    console.log('Jobs Error: ', error);
});

myJobs.on('run', (currentJob, counter) => {
    console.log('current job value: ', currentJob);
    console.log('current job index (counter) value: ', counter);
    const randomBool = Math.random() >= 0.5;
    if (!randomBool) {
        // simulate a failed job...
        console.log('Job', currentJob, 'failed!');
        myJobs.resetJob();
        return;
    }
    console.log('Job',currentJob, 'success!');
    myJobs.nextJob();
});

myJobs.on('finished', (jobsSummary) => {
    console.log('Joebear finished, summary:', jobsSummary);
});

// start Joebear
myJobs.start();

Cron

A more complete example of a cron job that runs every 15 min which checks crypto coins values.

example link

API

joebear(jobsArray)

First argument must be array of elements.

Returns: EventEmitter

jobsArray

Array of your elements where each define a job

start()

Start joebear

stop()

Stop joebear (force quit)

Event Handlers

on('run', callback)

Main handler on current job

callback function (currentJob, counter, originalJobsArray, resetMessage)

The callback function is responsible to process the job

currentJob

Current element from the jobsArray

counter

Current progress, current job iteration

originalJobsArray

Original jobsArray for reference if needed

resetMessage

In case of a job being reseted you can pass data along and get it from this argument

on('err')

Handler in case of error(s)

on('finished', jobsSummary)

Handler when all jobs were processed OR stop() was called to force quit.

jobsSummary

Returned object with these properties:

• time- total time in seconds since joebear start() executed
• total - number of total tasks
• dispatch - number of total tasks that successfully processed

See examples folder for full usage reference.

License

MIT Licensed. Copyright (c) Arye Shalev 2019.