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    <p>When your express app gets a request to edit the config, add an item to an <a href="https://caolan.github.io/async/docs.html#queue" rel="nofollow noreferrer">async.js queue</a> configured with concurrency of 1. This will prevent > 1 concurrent attempt to edit the remote configuration. Pseudo code would be:</p> <ul> <li>at app startup, define your <code>updateNetworkConfig</code> function</li> <li>at app startup, create a queue of concurrency 1 <ul> <li><code>var networkQueue = async.queue(updateNetworkConfig, 1);</code></li> </ul></li> <li>REST comes in like PUT /api/config/network with the new config as the request body in JSON</li> <li>Add an item to the queue, passing along the new config data <ul> <li><code>networkQueue.push(req.body.config);</code></li> <li>(<code>req.body</code> provided by the bodyParser connect middleware)</li> </ul></li> <li>Repeat that setup for each independent config: filesystem, etc</li> </ul> <p>You'll need a bunch of other plumbing to deal with callbacks and notify the REST clients when their configuration has been saved. Up to you whether to queue up calls or reject new calls if the queue is not empty.</p> <p>Since you insist on not learning and using the awesome async.js library that will increase your fluency with asynchronous programming and teach you valuable things, here's the deal. Use this thing called a variable.</p> <pre><code>var updatingNetwork = false; app.put('/api/config/network', function (req, res) { if (updatingNetwork) { return res.status(409).send("Try later"); } updatingNetwork = true; updateNetworkConfig(req.body.config, function (error) { updatingNetwork = false; if (error) { return res.status(500).send(error); } res.status(200).send("done"); }); }); </code></pre> <ul> <li>When a request comes in, if <code>updatingNetwork</code> is true, you know there's already an update in process, either queue this one up or reject it.</li> </ul>
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    1. COthis is a good answer on how I could do it with async.js, but what methods could I apply to solve this without async.js or another library?
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    2. COan amazing post sir :)
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