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Broadcaster,
KeyLike,
Linkable,
ObjLike,
State,
StateMetadata,
StateSubscribeFn,
StateSubscriber,
SubscribeFactoryInit,
} from './types.js';
import {
BROADCASTER_REGISTRY,
CONTROLLER_REGISTRY,
EXCEPTION_HANDLER_REGISTRY,
INIT_GATEWAY_REGISTRY,
INIT_REGISTRY,
META_INIT_REGISTRY,
META_REGISTRY,
MUTATOR_REGISTRY,
RELATION_REGISTRY,
SORTER_REGISTRY,
STATE_REGISTRY,
SUBSCRIBER_REGISTRY,
SUBSCRIPTION_REGISTRY,
} from './registry.js';
import { captureStack } from './exception.js';
import { shortId, softEntries, softValues } from './utils/index.js';
import { getDevTool } from './dev.js';
/**
* Creates a factory function for linking child states to a parent state.
*
* This factory generates a function that establishes a connection between a child state and its parent,
* allowing state changes in the child to propagate up through the state tree. The linking process
* involves subscribing to the child state's changes and broadcasting them with an updated path that
* includes the child's key.
*
* @template T - The type of the parent state
* @param init - The initial value of the parent state
* @param meta - The metadata associated with the parent state
* @returns {(childPath: KeyLike, childState: State, receiver?: State) => void}
* A function that links a child state to the parent state
*/
export function createLinkFactory<T extends Linkable>(
init: T,
meta: StateMetadata<T>
): (childPath: KeyLike, childState: State, receiver?: State) => void {
const devTool = getDevTool();
const broadcaster = BROADCASTER_REGISTRY.get(init) as Broadcaster;
return (childPath: KeyLike, childState: State, receiver?: State): void => {
if (meta.subscriptions.has(childState)) return;
// Get the controller for the child state
const childInit = STATE_REGISTRY.get(childState) as Linkable;
const childMeta = META_REGISTRY.get(childInit) as StateMetadata;
const childController = CONTROLLER_REGISTRY.get(childState);
// If the child state has a valid controller with subscribe method
if (typeof childController?.subscribe === 'function') {
const childHandler: StateSubscriber<unknown> = (_, event, emitter) => {
// Ignore init events to prevent duplicate notifications
if (event && event.type !== 'init') {
const keys = [childPath, ...event.keys] as KeyLike[];
// Broadcast the event with modified path to include the key
broadcaster.broadcast(init, { ...event, keys }, emitter);
}
};
Object.defineProperty(childHandler, '__internal_id__', {
value: meta.id,
});
// Subscribe to the child state changes
const childUnsubscribe = childController.subscribe(childHandler, receiver);
// Store the unsubscribe function for cleanup
meta.subscriptions.set(childState, childUnsubscribe);
devTool?.onLink?.(meta, childMeta);
}
};
}
/**
* Creates a factory function for unlinking child states from a parent state.
*
* This factory generates a function that removes the connection between a child state and its parent,
* cleaning up subscriptions and preventing further state change propagation from the child to the parent.
* The unlinking process involves calling the stored unsubscribe function for the child state and
* removing the subscription reference from the tracking map.
*
* @param meta - The metadata object associated with the child state
* @returns {(childState: Linkable) => void} A function that unlinks a child state from the parent state
*/
export function createUnlinkFactory<T extends Linkable>(meta: StateMetadata<T>): (childState: Linkable) => void {
const devTool = getDevTool();
const { subscriptions } = meta;
return (childState: State) => {
const unsubscribe = subscriptions.get(childState);
if (typeof unsubscribe === 'function') {
unsubscribe();
subscriptions.delete(childState);
if (devTool?.onUnlink) {
const childInit = STATE_REGISTRY.get(childState) as Linkable;
const childMeta = META_REGISTRY.get(childInit) as StateMetadata;
devTool.onUnlink(meta, childMeta);
}
}
};
}
/**
* Creates a factory function for subscribing to state changes.
*
* This factory generates a function that allows observers to subscribe to state changes,
* immediately notifying them with the current state. It manages subscriber registration,
* handles duplicate subscriptions, links child states for nested reactivity, and provides
* an unsubscribe mechanism. When the last subscriber is removed, it automatically cleans
* up all child state subscriptions.
*
* @template T - The type of the state being subscribed to
* @param init - The initial state value
* @param state - The state associated with the init
* @param meta - The metadata associated with the init
* @param helper - Utilities to handle the subscriptions
* @returns {StateSubscribeFn<T>} A function that subscribes a handler to state changes
*/
export function createSubscribeFactory<T extends Linkable>(
init: T,
state: State<T>,
meta: StateMetadata<T>,
helper: SubscribeFactoryInit
): StateSubscribeFn<T> {
const devTool = getDevTool();
const { subscribers, subscriptions } = meta;
const subscribeFn = (handler: StateSubscriber<T>, receiver?: State, recursive = meta.configs.recursive) => {
// Immediately notify the handler with the current state.
try {
handler(init, { type: 'init', keys: [] });
} catch (error) {
captureStack.error.external('Unable to execute the subscription handler function', error as Error);
return () => {};
}
const unsubscribeFn = () => {
// Do nothing if no subscribers left for potential multiple unsubscribe calls.
if (!subscribers.size) return;
// Remove the handler from active subscribers
subscribers.delete(handler);
// If no more subscribers, clean up resources
if (subscribers.size <= 0 && recursive) {
// Unlink all child references if any exist
if (subscriptions.size) {
// Iterate over a copy of the subscriptions map to safely unlink
subscriptions.forEach((_, val) => {
helper.unlink(val as State);
});
}
}
devTool?.onUnsubscribe?.(meta, handler, receiver);
};
// Check if the handler is already subscribed.
// If it is, return an empty unsubscribe function to prevent duplicate notifications.
if (subscribers.has(handler)) {
captureStack.warning.external(
'Duplicate subscription',
'Attempted to subscribe to a state using the same handler multiple times.',
'Subscription handler already registered',
subscribeFn
);
return unsubscribeFn;
}
// Add the handler to the list of active subscribers
subscribers.add(handler);
if (recursive && !(Array.isArray(init) && meta.configs.recursive === 'flat')) {
for (const [key, value] of softEntries(init as ObjLike)) {
const childState = INIT_REGISTRY.get(value as Linkable) as State;
if (childState && !subscriptions.has(childState) && childState !== receiver) {
helper.link(key, childState, (receiver ?? state) as State);
}
}
}
devTool?.onSubscribe?.(meta, handler, receiver);
// Return the unsubscribe function
return unsubscribeFn;
};
subscribeFn.all = (handler: StateSubscriber<T>, receiver?: State, recursive = meta.configs.recursive) => {
Object.defineProperty(handler, '__internal_id__', { value: shortId() });
return subscribeFn(handler, receiver, recursive);
};
return subscribeFn;
}
/**
* Creates a factory function for destroying a state and cleaning up all associated resources.
*
* This factory generates a function that completely destroys a state by:
* 1. Unsubscribing all active subscriptions to child states
* 2. Clearing all subscribers and subscriptions
* 3. Removing the state from all internal registries (INIT, META, REFERENCE, STATE, CONTROLLER, SUBSCRIBER,
* SUBSCRIPTION)
*
* This cleanup process ensures no memory leaks and properly disconnects the state from the reactive system.
*
* @template T - The type of the state being destroyed
* @param init - Initial state value
* @param state - The state object to be destroyed and removed from registries
* @param meta - The metadata associated with the state
* @returns {() => void} A function that destroys the state and cleans up all resources
*/
export function createDestroyFactory<T extends Linkable>(init: T, state: State<T>, meta: StateMetadata<T>): () => void {
const devTool = getDevTool();
const { observers, subscribers, subscriptions, exceptionHandlers } = meta;
const handler = (propagation?: boolean) => {
// Prevents destroying a state that is already destroyed.
if (!INIT_REGISTRY.has(init)) return;
if (propagation && subscribers.size) {
const error = new Error('State is active');
captureStack.error.internal('Attempted to destroy state that still active', error, handler);
return;
}
// Removing the destroyed state from all observers.
if (observers.size) {
for (const observer of observers) {
if (observer.states.has(init)) {
observer.states.delete(init);
}
}
observers.clear();
}
if (subscriptions.size) {
for (const unsubscribe of subscriptions.values()) {
unsubscribe?.();
}
subscriptions.clear();
}
for (const childInit of softValues(init as { [key: string]: Linkable })) {
const childState = INIT_REGISTRY.get(childInit as Linkable) as State;
if (childState) {
const childController = CONTROLLER_REGISTRY.get(childState);
if (!childController?.meta.subscribers.size) {
(childController?.destroy as (prop: boolean) => void)(true);
}
}
}
// Cleaning up the subscriber list.
subscribers.clear();
exceptionHandlers.clear();
// Remove the state from STATE_REGISTRY and STATE_LINK.
INIT_REGISTRY.delete(init);
META_REGISTRY.delete(init);
SORTER_REGISTRY.delete(init);
RELATION_REGISTRY.delete(init);
MUTATOR_REGISTRY.delete(init);
BROADCASTER_REGISTRY.delete(init);
INIT_GATEWAY_REGISTRY.delete(init);
STATE_REGISTRY.delete(state);
CONTROLLER_REGISTRY.delete(state);
SUBSCRIBER_REGISTRY.delete(state);
SUBSCRIPTION_REGISTRY.delete(state);
EXCEPTION_HANDLER_REGISTRY.delete(state);
META_INIT_REGISTRY.delete(meta as StateMetadata);
devTool?.onDestroy?.(init, meta);
};
return handler;
}
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