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tshemsedinovtshemsedinov
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Add examples
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4 files changed

+330
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lines changed

‎JavaScript/1-sync.js

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'use strict';
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const checkAvailability = (items, state) => {
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console.log({ checkStart: items });
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for (const item of items) {
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const { id, quantity } = item;
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const count = state[id];
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if (quantity > count) {
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console.log({ checkEnd: false });
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return false;
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}
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}
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console.log({ checkEnd: true });
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return true;
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};
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const processPayment = (payment) => {
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console.log({ payment });
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};
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const shipGoods = (items, state) => {
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for (const { id, quantity } of items) {
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state[id] -= quantity;
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}
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console.log({ ship: items });
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};
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const sendOrderConfirmation = (email) => {
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console.log({ email });
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};
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const buy = (order, state) => {
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const available = checkAvailability(order.items, state);
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if (available) {
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processPayment(order.paymentDetails);
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shipGoods(order.items, state);
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sendOrderConfirmation(order.userEmail);
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}
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console.log({ state });
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};
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const state = { 1722: 5 };
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const name = 'A4 Paper; 500 sheets; 75 Gsm';
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setTimeout(() => {
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const order1 = {
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paymentDetails: { card: '**** **** **** 1234' },
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items: [{ id: '1722', name, price: 52, quantity: 3 }],
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userEmail: '[email protected]',
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};
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buy(order1, state);
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}, 100);
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setTimeout(() => {
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const order2 = {
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paymentDetails: { card: '**** **** **** 1234' },
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items: [{ id: '1722', name, price: 52, quantity: 1 }],
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userEmail: '[email protected]',
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};
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buy(order2, state);
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}, 100);
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setTimeout(() => {
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const order3 = {
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paymentDetails: { card: '**** **** **** 1234' },
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items: [{ id: '1722', name, price: 52, quantity: 2 }],
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userEmail: '[email protected]',
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};
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buy(order3, state);
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}, 100);

‎JavaScript/2-async.js

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'use strict';
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const timers = require('node:timers/promises');
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const randomTimeout = () => timers.setTimeout(Math.random() * 500);
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const checkAvailability = async (items, state) => {
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console.log({ checkStart: items });
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for (const item of items) {
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const { id, quantity } = item;
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const count = state[id];
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if (quantity > count) {
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console.log({ checkEnd: false });
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return false;
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}
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}
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console.log({ checkEnd: true });
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await randomTimeout();
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return true;
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};
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const processPayment = async (payment) => {
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console.log({ payment });
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await randomTimeout();
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};
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const shipGoods = async (items, state) => {
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for (const { id, quantity } of items) {
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state[id] -= quantity;
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}
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console.log({ ship: items });
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await randomTimeout();
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};
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const sendOrderConfirmation = async (email) => {
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console.log({ email });
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await randomTimeout();
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};
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const buy = async (order, state) => {
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const available = await checkAvailability(order.items, state);
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if (available) {
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await processPayment(order.paymentDetails);
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await shipGoods(order.items, state);
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await sendOrderConfirmation(order.userEmail);
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}
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console.log({ state });
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};
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const state = { 1722: 5 };
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const name = 'A4 Paper; 500 sheets; 75 Gsm';
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const main = async () => {
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const order1 = {
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paymentDetails: { card: '**** **** **** 1234' },
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items: [{ id: '1722', name, price: 52, quantity: 3 }],
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userEmail: '[email protected]',
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};
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await buy(order1, state);
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const order2 = {
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paymentDetails: { card: '**** **** **** 1234' },
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items: [{ id: '1722', name, price: 52, quantity: 1 }],
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userEmail: '[email protected]',
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};
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await buy(order2, state);
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const order3 = {
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paymentDetails: { card: '**** **** **** 1234' },
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items: [{ id: '1722', name, price: 52, quantity: 2 }],
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userEmail: '[email protected]',
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};
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await buy(order3, state);
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};
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main();

‎JavaScript/3-unsafe.js

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'use strict';
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const timers = require('node:timers/promises');
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const randomTimeout = () => timers.setTimeout(Math.random() * 500);
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const checkAvailability = async (items, state) => {
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console.log({ checkStart: items });
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for (const item of items) {
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const { id, quantity } = item;
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const count = state[id];
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if (quantity > count) {
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console.log({ checkEnd: false });
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return false;
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}
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}
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console.log({ checkEnd: true });
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await randomTimeout();
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return true;
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};
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const processPayment = async (payment) => {
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console.log({ payment });
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await randomTimeout();
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};
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const shipGoods = async (items, state) => {
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for (const { id, quantity } of items) {
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state[id] -= quantity;
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}
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console.log({ ship: items });
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await randomTimeout();
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};
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const sendOrderConfirmation = async (email) => {
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console.log({ email });
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await randomTimeout();
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};
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const buy = async (order, state) => {
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const available = await checkAvailability(order.items, state);
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if (available) {
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await processPayment(order.paymentDetails);
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await shipGoods(order.items, state);
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await sendOrderConfirmation(order.userEmail);
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}
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console.log({ state });
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};
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const state = { 1722: 5 };
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const name = 'A4 Paper; 500 sheets; 75 Gsm';
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setTimeout(() => {
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const order1 = {
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paymentDetails: { card: '**** **** **** 1234' },
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items: [{ id: '1722', name, price: 52, quantity: 3 }],
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userEmail: '[email protected]',
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};
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buy(order1, state);
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}, 10);
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setTimeout(() => {
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const order2 = {
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paymentDetails: { card: '**** **** **** 1234' },
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items: [{ id: '1722', name, price: 52, quantity: 1 }],
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userEmail: '[email protected]',
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};
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buy(order2, state);
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}, 10);
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setTimeout(() => {
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const order3 = {
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paymentDetails: { card: '**** **** **** 1234' },
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items: [{ id: '1722', name, price: 52, quantity: 2 }],
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userEmail: '[email protected]',
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};
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buy(order3, state);
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}, 10);

‎JavaScript/4-actor.js

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'use strict';
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const timers = require('node:timers/promises');
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const randomTimeout = () => timers.setTimeout(Math.random() * 500);
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class Actor {
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#queue = [];
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#processing = false;
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#behavior = null;
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#state = null;
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constructor(behavior, state) {
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this.#behavior = behavior;
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this.#state = state;
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}
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async send(message) {
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this.#queue.push(message);
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await this.#process();
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}
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async #process() {
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if (this.#processing) return;
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this.#processing = true;
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while (this.#queue.length) {
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const message = this.#queue.shift();
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await this.#behavior(message, this.#state);
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}
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this.#processing = false;
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}
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}
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// Usage
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const checkAvailability = async (items, state) => {
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console.log({ checkStart: items });
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for (const item of items) {
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const { id, quantity } = item;
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const count = state[id];
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if (quantity > count) {
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console.log({ checkEnd: false });
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return false;
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}
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}
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console.log({ checkEnd: true });
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await randomTimeout();
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return true;
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};
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const processPayment = async (payment) => {
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console.log({ payment });
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await randomTimeout();
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};
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const shipGoods = async (items, state) => {
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for (const { id, quantity } of items) {
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state[id] -= quantity;
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}
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await randomTimeout();
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console.log({ ship: items });
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};
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const sendOrderConfirmation = async (email) => {
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console.log({ email });
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await randomTimeout();
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};
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const buy = async (order, state) => {
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const available = await checkAvailability(order.items, state);
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if (available) {
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await processPayment(order.paymentDetails);
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await shipGoods(order.items, state);
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await sendOrderConfirmation(order.userEmail);
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}
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console.log({ state });
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};
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const main = async () => {
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const orderActor = new Actor(buy, { 1722: 5 });
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const name = 'A4 Paper; 500 sheets; 75 Gsm';
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const order1 = {
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paymentDetails: { card: '**** **** **** 1234' },
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items: [{ id: '1722', name, price: 52, quantity: 3 }],
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userEmail: '[email protected]',
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};
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await orderActor.send(order1);
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const order2 = {
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paymentDetails: { card: '**** **** **** 1234' },
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items: [{ id: '1722', name, price: 52, quantity: 1 }],
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userEmail: '[email protected]',
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};
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await orderActor.send(order2);
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const order3 = {
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paymentDetails: { card: '**** **** **** 1234' },
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items: [{ id: '1722', name, price: 52, quantity: 2 }],
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userEmail: '[email protected]',
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};
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await orderActor.send(order3);
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};
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main();

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