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Copy path2-disposable-stack.js
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60 lines (45 loc) · 1.21 KB
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'use strict';
const timers = require('node:timers/promises');
class Resource {
#name = undefined;
constructor(name) {
this.#name = name;
console.log(`Open: ${name}`);
}
[Symbol.dispose]() {
console.log(`Dispose: ${this.#name}`);
}
async [Symbol.asyncDispose]() {
await timers.setTimeout(10);
console.log(`Async dispose: ${this.#name}`);
}
}
const stack = () => {
using resources = new DisposableStack();
resources.use(new Resource('database'));
resources.use(new Resource('cache'));
resources.use(new Resource('server'));
};
const stackAsync = async () => {
await using resources = new AsyncDisposableStack();
resources.use(new Resource('database'));
resources.use(new Resource('cache'));
resources.use(new Resource('server'));
};
const acquire = () => {
using resources = new DisposableStack();
resources.use(new Resource('database'));
resources.use(new Resource('cache'));
return resources.move();
};
const move = () => {
using resources = acquire();
if (resources.disposed) throw new ReferenceError('Stack already disposed');
console.log('Ownership moved to caller');
};
const main = async () => {
stack();
await stackAsync();
move();
};
main();