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* Component Lifecycle System for Coherent.js
* Provides hooks and events for component lifecycle management
*/
import { globalErrorHandler } from '../utils/error-handler.js';
import { ReactiveState } from '../state/reactive-state.js';
/**
* Lifecycle phases
*/
export const LIFECYCLE_PHASES = {
BEFORE_CREATE: 'beforeCreate',
CREATED: 'created',
BEFORE_MOUNT: 'beforeMount',
MOUNTED: 'mounted',
BEFORE_UPDATE: 'beforeUpdate',
UPDATED: 'updated',
BEFORE_UNMOUNT: 'beforeUnmount',
UNMOUNTED: 'unmounted',
ERROR: 'error'
};
/**
* Component instance tracker
*/
const componentInstances = new WeakMap();
const componentRegistry = new Map();
/**
* Component lifecycle manager
*/
export class ComponentLifecycle {
constructor(component, options = {}) {
this.component = component;
this.id = this.generateId();
this.options = options;
this.phase = null;
this.hooks = new Map();
this.state = new ReactiveState();
this.props = {};
this.context = {};
this.isMounted = false;
this.isDestroyed = false;
this.children = new Set();
this.parent = null;
this.eventHandlers = new Map();
this.timers = new Set();
this.subscriptions = new Set();
// Register instance
componentInstances.set(component, this);
componentRegistry.set(this.id, this);
// Initialize lifecycle
this.executeHook(LIFECYCLE_PHASES.BEFORE_CREATE);
this.executeHook(LIFECYCLE_PHASES.CREATED);
}
/**
* Generate unique component ID
*/
generateId() {
return `comp_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
}
/**
* Add lifecycle hook
*/
hook(phase, callback) {
if (typeof callback !== 'function') {
throw new Error(`Hook callback must be a function for phase: ${phase}`);
}
if (!this.hooks.has(phase)) {
this.hooks.set(phase, []);
}
this.hooks.get(phase).push(callback);
return this;
}
/**
* Execute hooks for a specific phase
*/
async executeHook(phase, ...args) {
if (this.isDestroyed) {
return;
}
this.phase = phase;
const hooks = this.hooks.get(phase) || [];
for (const hook of hooks) {
try {
await hook.call(this, ...args);
} catch (error) {
this.handleError(error, phase);
}
}
}
/**
* Handle component errors
*/
handleError(error, phase) {
const enhancedError = globalErrorHandler.handle(error, {
component: this.component,
context: {
phase,
componentId: this.id,
props: this.props,
state: this.state.toObject()
}
});
this.executeHook(LIFECYCLE_PHASES.ERROR, enhancedError);
}
/**
* Mount component
*/
async mount(container, props = {}) {
if (this.isMounted) {
console.warn(`Component ${this.id} is already mounted`);
return;
}
this.props = props;
this.container = container;
await this.executeHook(LIFECYCLE_PHASES.BEFORE_MOUNT, container, props);
try {
// Actual mounting logic would be handled by the renderer
this.isMounted = true;
await this.executeHook(LIFECYCLE_PHASES.MOUNTED, container);
} catch (error) {
this.handleError(error, 'mount');
}
}
/**
* Update component
*/
async update(newProps = {}) {
if (!this.isMounted || this.isDestroyed) {
return;
}
const oldProps = this.props;
this.props = { ...this.props, ...newProps };
await this.executeHook(LIFECYCLE_PHASES.BEFORE_UPDATE, newProps, oldProps);
try {
// Update logic would be handled by the renderer
await this.executeHook(LIFECYCLE_PHASES.UPDATED, this.props, oldProps);
} catch (error) {
this.handleError(error, 'update');
}
}
/**
* Unmount component
*/
async unmount() {
if (!this.isMounted || this.isDestroyed) {
return;
}
await this.executeHook(LIFECYCLE_PHASES.BEFORE_UNMOUNT);
try {
// Cleanup children
for (const child of this.children) {
await child.unmount();
}
// Cleanup subscriptions
this.subscriptions.forEach(unsub => {
try {
unsub();
} catch (error) {
console.warn('Error cleaning up subscription:', error);
}
});
// Clear timers
this.timers.forEach(timer => {
clearTimeout(timer);
clearInterval(timer);
});
// Remove event handlers
this.eventHandlers.forEach((handler, element) => {
handler.events.forEach((listeners, event) => {
listeners.forEach(listener => {
element.removeEventListener(event, listener);
});
});
});
// Cleanup state
this.state.destroy();
this.isMounted = false;
this.isDestroyed = true;
await this.executeHook(LIFECYCLE_PHASES.UNMOUNTED);
// Unregister
componentRegistry.delete(this.id);
} catch (error) {
this.handleError(error, 'unmount');
}
}
/**
* Add child component
*/
addChild(child) {
child.parent = this;
this.children.add(child);
}
/**
* Remove child component
*/
removeChild(child) {
child.parent = null;
this.children.delete(child);
}
/**
* Add event listener with automatic cleanup
*/
addEventListener(element, event, listener, options = {}) {
if (!this.eventHandlers.has(element)) {
this.eventHandlers.set(element, {
events: new Map()
});
}
const handler = this.eventHandlers.get(element);
if (!handler.events.has(event)) {
handler.events.set(event, new Set());
}
handler.events.get(event).add(listener);
element.addEventListener(event, listener, options);
// Return cleanup function
return () => {
handler.events.get(event).delete(listener);
element.removeEventListener(event, listener);
};
}
/**
* Add subscription with automatic cleanup
*/
addSubscription(unsubscribe) {
this.subscriptions.add(unsubscribe);
return unsubscribe;
}
/**
* Set timer with automatic cleanup
*/
setTimeout(callback, delay) {
const timer = setTimeout(() => {
this.timers.delete(timer);
callback();
}, delay);
this.timers.add(timer);
return timer;
}
setInterval(callback, interval) {
const timer = setInterval(callback, interval);
this.timers.add(timer);
return timer;
}
/**
* Get component statistics
*/
getStats() {
return {
id: this.id,
phase: this.phase,
isMounted: this.isMounted,
isDestroyed: this.isDestroyed,
childCount: this.children.size,
eventHandlers: this.eventHandlers.size,
subscriptions: this.subscriptions.size,
timers: this.timers.size,
state: this.state.getStats()
};
}
}
/**
* Event system for components
*/
export class ComponentEventSystem {
constructor() {
this.events = new Map();
this.globalHandlers = new Map();
}
/**
* Emit event to component or globally
*/
emit(eventName, data = {}, target = null) {
const event = {
name: eventName,
data,
target,
timestamp: Date.now(),
stopped: false,
preventDefault: false
};
// Target specific component
if (target) {
const instance = componentInstances.get(target);
if (instance) {
this._notifyHandlers(instance.id, event);
}
} else {
// Global event
this._notifyGlobalHandlers(event);
}
return event;
}
/**
* Listen for events on component or globally
*/
on(eventName, handler, componentId = null) {
if (componentId) {
// Component-specific event
if (!this.events.has(componentId)) {
this.events.set(componentId, new Map());
}
const componentEvents = this.events.get(componentId);
if (!componentEvents.has(eventName)) {
componentEvents.set(eventName, new Set());
}
componentEvents.get(eventName).add(handler);
} else {
// Global event
if (!this.globalHandlers.has(eventName)) {
this.globalHandlers.set(eventName, new Set());
}
this.globalHandlers.get(eventName).add(handler);
}
// Return unsubscribe function
return () => this.off(eventName, handler, componentId);
}
/**
* Remove event handler
*/
off(eventName, handler, componentId = null) {
if (componentId) {
const componentEvents = this.events.get(componentId);
if (componentEvents && componentEvents.has(eventName)) {
componentEvents.get(eventName).delete(handler);
// Cleanup empty sets
if (componentEvents.get(eventName).size === 0) {
componentEvents.delete(eventName);
if (componentEvents.size === 0) {
this.events.delete(componentId);
}
}
}
} else {
const handlers = this.globalHandlers.get(eventName);
if (handlers) {
handlers.delete(handler);
if (handlers.size === 0) {
this.globalHandlers.delete(eventName);
}
}
}
}
/**
* Listen once
*/
once(eventName, handler, componentId = null) {
const onceHandler = (event) => {
handler(event);
this.off(eventName, onceHandler, componentId);
};
return this.on(eventName, onceHandler, componentId);
}
/**
* Notify component handlers
*/
_notifyHandlers(componentId, event) {
const componentEvents = this.events.get(componentId);
if (componentEvents && componentEvents.has(event.name)) {
const handlers = componentEvents.get(event.name);
for (const handler of handlers) {
if (event.stopped) break;
try {
handler(event);
} catch (error) {
globalErrorHandler.handle(error, {
type: 'event-handler-error',
context: { event, handler: handler.toString() }
});
}
}
}
}
/**
* Notify global handlers
*/
_notifyGlobalHandlers(event) {
const handlers = this.globalHandlers.get(event.name);
if (handlers) {
for (const handler of handlers) {
if (event.stopped) break;
try {
handler(event);
} catch (error) {
globalErrorHandler.handle(error, {
type: 'global-event-handler-error',
context: { event, handler: handler.toString() }
});
}
}
}
}
/**
* Clean up events for a component
*/
cleanup(componentId) {
this.events.delete(componentId);
}
/**
* Get event statistics
*/
getStats() {
return {
componentEvents: this.events.size,
globalEvents: this.globalHandlers.size,
totalHandlers: Array.from(this.events.values()).reduce((sum, events) => {
return sum + Array.from(events.values()).reduce((eventSum, handlers) => {
return eventSum + handlers.size;
}, 0);
}, 0) + Array.from(this.globalHandlers.values()).reduce((sum, handlers) => {
return sum + handlers.size;
}, 0)
};
}
}
/**
* Global event system instance
*/
export const eventSystem = new ComponentEventSystem();
/**
* Lifecycle hooks factory
*/
export function createLifecycleHooks() {
const hooks = {};
Object.values(LIFECYCLE_PHASES).forEach(phase => {
hooks[phase] = (callback) => {
// This would be called during component creation
const instance = getCurrentInstance();
if (instance) {
instance.hook(phase, callback);
}
};
});
return hooks;
}
/**
* Get current component instance (context-based)
*/
let currentInstance = null;
export function getCurrentInstance() {
return currentInstance;
}
export function setCurrentInstance(instance) {
currentInstance = instance;
}
/**
* Lifecycle hooks for direct use
*/
export const useHooks = createLifecycleHooks();
/**
* Utility functions for component management
*/
export const componentUtils = {
/**
* Get component lifecycle instance
*/
getLifecycle(component) {
return componentInstances.get(component);
},
/**
* Create component with lifecycle
*/
createWithLifecycle(component, options = {}) {
const lifecycle = new ComponentLifecycle(component, options);
return {
component,
lifecycle,
mount: lifecycle.mount.bind(lifecycle),
unmount: lifecycle.unmount.bind(lifecycle),
update: lifecycle.update.bind(lifecycle)
};
},
/**
* Get all component instances
*/
getAllInstances() {
return Array.from(componentRegistry.values());
},
/**
* Find component by ID
*/
findById(id) {
return componentRegistry.get(id);
},
/**
* Emit event to component
*/
emit(component, eventName, data) {
return eventSystem.emit(eventName, data, component);
},
/**
* Listen to component events
*/
listen(component, eventName, handler) {
const lifecycle = componentInstances.get(component);
return eventSystem.on(eventName, handler, lifecycle?.id);
}
};
/**
* Component decorator for automatic lifecycle management
*/
export function withLifecycle(component, options = {}) {
return function LifecycleComponent(props = {}) {
const instance = componentUtils.getLifecycle(component);
if (!instance) {
const lifecycle = new ComponentLifecycle(component, options);
setCurrentInstance(lifecycle);
}
const result = typeof component === 'function' ? component(props) : component;
setCurrentInstance(null);
return result;
};
}
export default ComponentLifecycle; |