NodeJS Async-lock example

async-lock.js

/**
* Preventing dead-locks, using async-lock by key
*/

var AsyncLock = require('async-lock');
var lock = new AsyncLock();

function operation(id) {
    console.log(id + " calling operation");
    lock.acquire(id, function(done) {
        console.log(id + " Running operation")
        setTimeout(function() {
            console.log(id + " Finishing operation")
            done();
        }, 3000)
    }, function(err, ret) {
        console.log(id + " Freeing lock", ret)
    }, {});
}


operation('key1'); // will Run
operation('key1'); // will Wait the 1st
operation('key2'); // will Run Paralell with the 1st

Thanks for the example. I guess on line 8 the parameter should be called 'id' right?

@haraldreingruber Yes, and on line 17 the parameter should be called 'ret' instead 'uuid'

@marce1994 You can check if is busy...

lock.isBusy();

how can I make a return in lock.aquire ?
i want to make an function with a operation in lock and return the result that I obtain in lock.

@NeilJ12 Were you able to create a function? I am looking for a similar function.