concurrency

package com.example.orders;

public final class Order {

    public static final Order POISON_PILL = new Order(-1L, 0.0);

package main

import (
  "context"
  "log"
  "net/http"

import time
import threading
from dataclasses import dataclass, field
from typing import Callable, Dict, List

import time
from dataclasses import dataclass
from typing import Optional

import requests

-- KEYS[1] = current window key, KEYS[2] = previous window key
-- ARGV: limit, window_ms, elapsed_ms
local limit = tonumber(ARGV[1])
local window = tonumber(ARGV[2])
local elapsed = tonumber(ARGV[3])

package service

import (
  "context"

  "golang.org/x/sync/errgroup"

#[derive(Debug, Clone)]
pub struct Order {
    pub id: u64,
    pub amount_cents: i64,
    pub currency: [u8; 3],
}

use std::time::{Duration, Instant};

pub struct LeakyBucket {
    level: f64,
    capacity: f64,
    rate_per_sec: f64,

use std::sync::mpsc::{self, SyncSender};
use std::sync::{Arc, Mutex};
use std::thread;

mod worker;
use worker::{Message, Worker};

import asyncio
import time
from dataclasses import dataclass, field


@dataclass

CREATE TABLE idempotency_keys (
    id              BIGSERIAL PRIMARY KEY,
    idempotency_key TEXT        NOT NULL,
    request_path    TEXT        NOT NULL,
    request_fingerprint TEXT    NOT NULL,
    status          TEXT        NOT NULL DEFAULT 'in_progress',

use std::os::raw::c_int;

pub const LOCK_EX: c_int = 2;
pub const LOCK_NB: c_int = 4;
pub const LOCK_UN: c_int = 8;