reservator

deno land deno doc Test

The reservator is a Deno module that provides the Reservator class. The Reservator class is used to reserve resources or events with unique keys, and wait for them to be resolved or rejected.

Installation

To use the reservator module, you can import it directly from the Deno third-party modules repository:

import { Reservator } from "https://deno.land/x/reservator/mod.ts";

Usage

The Reservator class provides three methods: reserve, resolve, and reject.

  • The reserve method is used to reserve a resource or event with a unique key. It returns a promise that is resolved or rejected when the resource is resolved or rejected. If a reservation with the same key already exists, an AlreadyReservedError is thrown.

  • The resolve method is used to resolve a reservation with a key and a value. It deletes the reservation from the Reservator object and resolves the corresponding promise. If no reservation with the given key exists, a NoReservationError is thrown.

  • The reject method is used to reject a reservation with a key and an optional reason. It deletes the reservation from the Reservator object and rejects the corresponding promise. If no reservation with the given key exists, a NoReservationError is thrown.

Here is an example usage of the Reservator class:

import { delay } from "https://deno.land/std/async/mod.ts";
import { AlreadyReservedError, NoReservationError, Reservator } from "./mod.ts";

async function main(): Promise<void> {
  const key = "reservationKey:1";

  const reservator = new Reservator();

  const consumer = (async () => {
    // Reserve `key` and wait
    const received = await reservator.reserve(key);
    console.log(`Received: ${received}`);
  })();

  const producer = (async () => {
    // Wait 3 seconds
    await delay(3000);
    // Resolve with the key
    reservator.resolve(key, "Hello world");
  })();

  await Promise.all([consumer, producer]);
}

main();

License

The code follows the MIT license written in LICENSE. By contributing to this repository, you agree that any modifications you make also follow the MIT license.