concurrency

from sqlalchemy import Column, Integer, BigInteger, String
from sqlalchemy.orm import declarative_base

Base = declarative_base()

const { Worker, MessageChannel } = require('node:worker_threads');
const path = require('node:path');

class WorkerPool {
  constructor(size) {
    this.workers = [];

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreateStripeEvents < ActiveRecord::Migration[7.1]
  def change
    create_table :stripe_events do |t|
      t.string :stripe_event_id, null: false
      t.string :event_type, null: false
      t.string :status, null: false, default: "received"

package com.example.cache;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CompletionException;
import java.util.concurrent.atomic.AtomicBoolean;

package com.example.ratelimit;

public class TokenBucket {

    private final long capacity;
    private final long refillTokens;

import time
import threading
from collections import deque, defaultdict


class SlidingWindowLimiter:

require "sidekiq/api"

class QueueDepthGuard
  class QueueSaturated < StandardError
    attr_reader :queue, :depth

package com.shop.inventory;

import jakarta.persistence.*;

@Entity
@Table(name = "inventory_item")

package optimistic

import (
	"errors"
	"sync"
)

# Basic Ractor usage
ractor = Ractor.new do
  # This runs in parallel, isolated from main thread
  result = heavy_computation
  result
end

CREATE TABLE outbox_deliveries (
    id              BIGSERIAL PRIMARY KEY,
    dedupe_key      TEXT        NOT NULL,
    target_url      TEXT        NOT NULL,
    payload         JSONB       NOT NULL,
    status          TEXT        NOT NULL DEFAULT 'PENDING',