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actor-compose.js
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75 lines (63 loc) · 1.62 KB
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'use strict';
class Actor {
#queue = [];
#processing = false;
#state = null;
constructor(Entity, ...args) {
this.#state = new Entity(...args);
}
async send({ method, args = [] }) {
return new Promise((resolve) => {
this.#queue.push({ method, args, resolve });
this.#process();
});
}
async #process() {
if (this.#processing) return;
this.#processing = true;
while (this.#queue.length) {
const { method, args, resolve } = this.#queue.shift();
if (typeof this.#state[method] === 'function') {
const result = await this.#state[method](...args);
resolve(result);
}
}
this.#processing = false;
}
}
class Point {
constructor(x, y) {
const errors = Point.validate(x, y);
if (errors.length > 0) {
const cause = new AggregateError(errors, 'Validation');
throw new RangeError('Bad coordinates', { cause });
}
this.x = x;
this.y = y;
}
static validate(x, y) {
const errors = [];
if (!Number.isFinite(x)) errors.push(new TypeError(`Invalid x: ${x}`));
if (!Number.isFinite(y)) errors.push(new TypeError(`Invalid y: ${y}`));
return errors;
}
move(x, y) {
this.x += x;
this.y += y;
}
clone() {
return new Actor(Point, this.x, this.y);
}
toString() {
return `(${this.x}, ${this.y})`;
}
}
// Usage
const main = async () => {
const p1 = new Actor(Point, 10, 20);
console.log(await p1.send({ method: 'toString' }));
const c1 = await p1.send({ method: 'clone' });
await c1.send({ method: 'move', args: [-5, 10] });
console.log(await c1.send({ method: 'toString' }));
};
main();