How to use @esfx/cancelable - 10 common examples

it("throws when token is canceled", async () => {
        await expect(new AsyncMutex().lock(Cancelable.canceled)).rejects.toThrow(CancelError);
    });
});

private async _lockWriter(handle: LockHandle, upgradeable: LockHandle | undefined, cancelable?: Cancelable) {
        Cancelable.throwIfSignaled(cancelable);
        while (true) {
            if (this._writer === handle) {
                throw new Error("Lock already taken.");
            }
            if (this._upgradeable !== upgradeable) {
                throw new Error("Lock already released.");
            }
            if (this._canTakeWriteLock()) {
                this._writer = handle;
                return;
            }
            await this._writerQueue.wait(cancelable);
        }
    }

async wait(cancelable?: Cancelable): Promise {
        Cancelable.throwIfSignaled(cancelable);
        if (this._currentCount > 0) {
            this._currentCount--;
            return;
        }
        await this._waiters.wait(cancelable);
    }

async wait(cancelable?: Cancelable): Promise {
        Cancelable.throwIfSignaled(cancelable);
        if (this._signaled) {
            this._signaled = false;
            return;
        }
        await this._waiters.wait(cancelable);
    }
}

async wait(cancelable?: Cancelable): Promise {
        Cancelable.throwIfSignaled(cancelable);
        if (this._signaled) {
            return;
        }
        await this._waiters.wait(cancelable);
    }
}

async signalAndWait(cancelable?: Cancelable): Promise {
        Cancelable.throwIfSignaled(cancelable);

        if (this._isExecutingPostPhaseAction) throw new Error("This method may not be called from within the postPhaseAction.");
        if (this._participantCount === 0) throw new Error("The barrier has no registered participants.");
        if (this._remainingParticipants === 0) throw new Error("The number of operations using the barrier exceeded the number of registered participants.");

        const waiter = this._waiters.wait(cancelable);
        this._remainingParticipants--;
        if (this._remainingParticipants === 0) {
            this._finishPhase();
        }
        
        await waiter;
    }

private async _lockReader(handle: LockHandle, upgradeable: boolean, cancelable?: Cancelable) {
        Cancelable.throwIfSignaled(cancelable);
        while (true) {
            if (this._readers.has(handle)) {
                throw new Error("Lock already taken.");
            }
            if (this._canTakeReadLock() && !(upgradeable && this._upgradeable)) {
                this._readers.add(handle);
                if (upgradeable) {
                    this._upgradeable = handle;
                }
                return;
            }
            await this._readerQueue.wait(cancelable);
        }
    }

private async _lock(handle: LockHandle, cancelable?: Cancelable) {
        Cancelable.throwIfSignaled(cancelable);
        if (this._handle === handle) {
            throw new Error("Lock already taken.");
        }
        if (this._handle) {
            await this._waiters.wait(cancelable);
            if (this._handle === handle) {
                throw new Error("Lock already taken.");
            }
        }
        this._handle = handle;
    }

return new Promise((resolve, reject) => {
        let msec: number;
        if (typeof cancelable === "number") {
            value = _msec as T | PromiseLike;
            msec = cancelable;
            cancelable = Cancelable.none;
        }
        else {
            msec = _msec as number;
        }

        Cancelable.throwIfSignaled(cancelable);

        const handle = setTimeout(() => {
            subscription.unsubscribe();
            resolve(value);
        }, msec);

        const subscription = Cancelable.subscribe(cancelable, () => {
            clearTimeout(handle);
            reject(new CancelError());
        });
    });
}

function createCancelSubscription(node: LinkedListNode<() => void>): CancelSubscription {
    return CancelSubscription.create(() => {
        if (node.detachSelf()) {
            node.value = undefined!;
        }
    });
}