I have two callbacks that need to be put on the same change event on the same item. For reasons that are not worth going into, I need to have these callbacks in separate on, I cannot unify them under…
For the following code in javascript I want to know if there are concurrent api requests to increment count is there any possibility of a race condition considering the fact that javascript is single threaded. app.post('/increment', async (req, res) =>…
In this test, I create a new directory (deleting it if it already exists), add it to sys.path, add two simple Python files, and try to import them. I'm using Python 3.11.6 on Ubuntu 23.10. import sys from pathlib import…
Symfony Installation: Created a Symfony project using Composer with the symfony/skeleton package. Added the webapp package using Composer. composer create-project symfony/skeleton:"7.0.*" symfony_test_app composer require webapp Database Setup: Configured the database URL with credentials. Created the database schema using Symfony's Doctrine…
I am updating a finance application built on node.js, mongodb and ```mongoose`` and I am currently facing a challenge with the logic to process fund withdrawals from the system. The problem is that a user can request an amount greater…
I'm just learning the details of how the event loop in Node works. I learned that the promise queue takes priority over the timer queue, which takes priority over the I/O queue. async function asyncFunc() { let sum = 0;…
Lets say I have a model Document. Document document_id -> int client_id -> int I want the document id to be auto incremented based on the client id avoiding a race condition. I have an unique constraint on document_id, client_id.…
I’m working on an e-commerce website with a cart and products. A product’s primary key is added to the user’s session data in a dictionary 'cart_content'. This dictionary hold product’s primary key as key and amount of the given product…
I'm trying to write a flutter application which lets you control multiple toys remotely using HTTP requests. The control elements are always visible, and the user can freely change between available toys by picking the active one from a list.…
I built an Online Shop Website with Mongo DB and Express.js that has flash sale features on it. Its traffic spiked when it came to the Flash Sale, with 5,000 users per minute. As we know, in the online shop,…