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* Enhanced Event Bus System for Coherent.js
* Adds priority, throttling, filtering, and advanced features
*/
// Performance monitor available for future use
// import { performanceMonitor } from '../performance/monitor.js';
/**
* Throttle helper
*/
function throttle(func, delay) {
let lastCall = 0;
let timeoutId = null;
return function throttled(...args) {
const now = Date.now();
const timeSinceLastCall = now - lastCall;
if (timeSinceLastCall >= delay) {
lastCall = now;
return func.apply(this, args);
} else {
if (timeoutId) clearTimeout(timeoutId);
timeoutId = setTimeout(() => {
lastCall = Date.now();
func.apply(this, args);
}, delay - timeSinceLastCall);
}
};
}
/**
* Debounce helper (available for future use)
*/
// function debounce(func, delay) {
// let timeoutId = null;
//
// return function debounced(...args) {
// if (timeoutId) clearTimeout(timeoutId);
// timeoutId = setTimeout(() => {
// func.apply(this, args);
// }, delay);
// };
// }
/**
* Event Bus with advanced features (backward compatible)
*/
export class EventBus {
constructor(options = {}) {
this.listeners = new Map(); // event -> Array of {listener, priority, options}
this.handlers = new Map();
this.actionHandlers = new Map();
this.middleware = [];
this.throttledEmitters = new Map();
this.debouncedEmitters = new Map();
this.options = {
debug: false,
performance: true,
maxListeners: 100,
enableWildcards: true,
enableAsync: true,
wildcardSeparator: ':',
enablePriority: true,
defaultPriority: 0,
errorHandler: null,
filters: {
allowList: null, // null means allow all
blockList: []
},
throttle: {
enabled: false,
defaultDelay: 100,
events: {}
},
batching: {
enabled: false,
maxBatchSize: 10,
flushInterval: 16
},
...options
};
// Performance tracking
this.stats = {
eventsEmitted: 0,
listenersExecuted: 0,
errorsOccurred: 0,
averageEmitTime: 0,
throttledEvents: 0,
filteredEvents: 0
};
// Batching queue
if (this.options.batching.enabled) {
this.batchQueue = [];
this.batchTimer = null;
}
// Debug middleware
if (this.options.debug) {
this.use((event, data, next) => {
console.log(`[EventBus] ${event}:`, data);
next();
});
}
}
/**
* Add middleware
*/
use(middleware) {
if (typeof middleware !== 'function') {
throw new Error('Middleware must be a function');
}
this.middleware.push(middleware);
return this;
}
/**
* Check if event passes filters
*/
passesFilters(event) {
const { allowList, blockList } = this.options.filters;
// Check block list first
if (blockList && blockList.length > 0) {
for (const pattern of blockList) {
if (this.matchPattern(pattern, event)) {
this.stats.filteredEvents++;
return false;
}
}
}
// Check allow list if it exists
if (allowList && allowList.length > 0) {
for (const pattern of allowList) {
if (this.matchPattern(pattern, event)) {
return true;
}
}
this.stats.filteredEvents++;
return false;
}
return true;
}
/**
* Match event against pattern
*/
matchPattern(pattern, event) {
const sep = this.options.wildcardSeparator;
const patternParts = pattern.split(sep);
const eventParts = event.split(sep);
if (pattern.includes('*')) {
if (patternParts.length !== eventParts.length) {
return false;
}
return patternParts.every((part, i) => part === '*' || part === eventParts[i]);
}
return pattern === event;
}
/**
* Emit an event
*/
async emit(event, data = null) {
// Check filters
if (!this.passesFilters(event)) {
if (this.options.debug) {
console.warn(`[EventBus] Event filtered: ${event}`);
}
return;
}
// Handle batching
if (this.options.batching.enabled) {
return this.addToBatch(event, data);
}
// Handle throttling
if (this.options.throttle.enabled) {
const throttleDelay = (this.options.throttle.events && this.options.throttle.events[event]) || this.options.throttle.defaultDelay;
if (throttleDelay > 0) {
return this.emitThrottled(event, data, throttleDelay);
}
}
return this.emitImmediate(event, data);
}
/**
* Emit immediately without throttling
*/
async emitImmediate(event, data = null) {
const startTime = this.options.performance ? performance.now() : 0;
try {
// Run middleware
await this.runMiddleware(event, data);
// Get listeners (sorted by priority if enabled)
const listeners = this.getEventListeners(event);
if (listeners.length === 0) {
if (this.options.debug) {
console.warn(`[EventBus] No listeners for event: ${event}`);
}
return;
}
// Execute listeners
const promises = listeners.map(listenerObj =>
this.executeListener(listenerObj.listener, event, data, listenerObj.options)
);
if (this.options.enableAsync) {
await Promise.allSettled(promises);
} else {
for (const promise of promises) {
await promise;
}
}
this.stats.eventsEmitted++;
this.stats.listenersExecuted += listeners.length;
} catch (error) {
this.stats.errorsOccurred++;
this.handleError(error, event, data);
} finally {
if (this.options.performance) {
const duration = performance.now() - startTime;
this.updatePerformanceStats(duration);
}
}
}
/**
* Emit with throttling
*/
emitThrottled(event, data, delay) {
if (!this.throttledEmitters.has(event)) {
const throttled = throttle((evt, d) => this.emitImmediate(evt, d), delay);
this.throttledEmitters.set(event, throttled);
}
this.stats.throttledEvents++;
return this.throttledEmitters.get(event)(event, data);
}
/**
* Add event to batch queue
*/
addToBatch(event, data) {
this.batchQueue.push({ event, data, timestamp: Date.now() });
if (this.batchQueue.length >= this.options.batching.maxBatchSize) {
this.flushBatch();
} else if (!this.batchTimer) {
this.batchTimer = setTimeout(() => {
this.flushBatch();
}, this.options.batching.flushInterval);
}
}
/**
* Flush batch queue
*/
async flushBatch() {
if (this.batchTimer) {
clearTimeout(this.batchTimer);
this.batchTimer = null;
}
const batch = this.batchQueue.splice(0);
for (const { event, data } of batch) {
await this.emitImmediate(event, data);
}
}
/**
* Register event listener with options
*/
on(event, listener, options = {}) {
if (typeof listener !== 'function') {
throw new Error('Listener must be a function');
}
if (!this.listeners.has(event)) {
this.listeners.set(event, []);
}
const listeners = this.listeners.get(event);
// Check max listeners
if (listeners.length >= this.options.maxListeners) {
console.warn(`[EventBus] Max listeners (${this.options.maxListeners}) reached for event: ${event}`);
}
// Create listener object
const listenerId = this.generateListenerId(event);
const listenerObj = {
listener,
listenerId,
priority: options.priority !== undefined ? options.priority : this.options.defaultPriority,
condition: options.condition || null,
timeout: options.timeout || null,
options
};
listener.__listenerId = listenerId;
listener.__event = event;
// Insert listener in priority order
if (this.options.enablePriority) {
const insertIndex = listeners.findIndex(l => l.priority < listenerObj.priority);
if (insertIndex === -1) {
listeners.push(listenerObj);
} else {
listeners.splice(insertIndex, 0, listenerObj);
}
} else {
listeners.push(listenerObj);
}
return listenerId;
}
/**
* Register one-time listener
*/
once(event, listener, options = {}) {
const onceListener = (...args) => {
this.off(event, onceListener.__listenerId);
return listener.call(this, ...args);
};
// Handle timeout for once listeners
if (options.timeout) {
const timeoutId = setTimeout(() => {
this.off(event, onceListener.__listenerId);
if (this.options.debug) {
console.warn(`[EventBus] Listener timeout for event: ${event}`);
}
}, options.timeout);
onceListener.__cleanup = () => clearTimeout(timeoutId);
}
return this.on(event, onceListener, options);
}
/**
* Remove listener
*/
off(event, listenerId) {
if (!this.listeners.has(event)) {
return false;
}
const listeners = this.listeners.get(event);
const index = listeners.findIndex(l => l.listenerId === listenerId);
if (index !== -1) {
const listenerObj = listeners[index];
if (listenerObj.listener.__cleanup) {
listenerObj.listener.__cleanup();
}
listeners.splice(index, 1);
if (listeners.length === 0) {
this.listeners.delete(event);
}
return true;
}
return false;
}
/**
* Remove all listeners for an event
*/
removeAllListeners(event) {
if (event) {
this.listeners.delete(event);
} else {
this.listeners.clear();
}
}
/**
* Get event listeners with wildcard support
*/
getEventListeners(event) {
const listeners = [];
// Direct listeners
if (this.listeners.has(event)) {
listeners.push(...this.listeners.get(event));
}
// Wildcard listeners
if (this.options.enableWildcards) {
for (const [pattern, patternListeners] of this.listeners) {
if (pattern.includes('*') && this.matchPattern(pattern, event)) {
listeners.push(...patternListeners);
}
}
}
// Sort by priority if enabled
if (this.options.enablePriority) {
listeners.sort((a, b) => b.priority - a.priority);
}
return listeners;
}
/**
* Execute listener with options
*/
async executeListener(listener, event, data, options = {}) {
try {
// Check condition
if (options.condition && !options.condition(data)) {
return;
}
const result = listener.call(this, data, event);
if (result && typeof result.then === 'function') {
await result;
}
return result;
} catch (error) {
this.handleError(error, event, data);
}
}
/**
* Run middleware chain
*/
async runMiddleware(event, data) {
if (this.middleware.length === 0) return;
let index = 0;
const next = async () => {
if (index < this.middleware.length) {
const middleware = this.middleware[index++];
await middleware(event, data, next);
}
};
await next();
}
/**
* Handle errors
*/
handleError(error, event, data) {
if (this.options.errorHandler) {
this.options.errorHandler(error, event, data);
} else if (this.options.debug) {
console.error(`[EventBus] Error in event ${event}:`, error, data);
}
// Emit error event
this.emitSync('eventbus:error', { error, event, data });
}
/**
* Synchronous emit
*/
emitSync(event, data = null) {
try {
const listeners = this.getEventListeners(event);
listeners.forEach(listenerObj => {
try {
if (!listenerObj.options.condition || listenerObj.options.condition(data)) {
listenerObj.listener.call(this, data, event);
}
} catch (error) {
this.handleError(error, event, data);
}
});
this.stats.eventsEmitted++;
this.stats.listenersExecuted += listeners.length;
} catch (error) {
this.stats.errorsOccurred++;
this.handleError(error, event, data);
}
}
/**
* Register action handler
*/
registerAction(action, handler) {
if (typeof handler !== 'function') {
throw new Error('Action handler must be a function');
}
this.actionHandlers.set(action, handler);
if (this.options.debug) {
console.log(`[EventBus] Registered action: ${action}`);
}
}
/**
* Register multiple actions
*/
registerActions(actions) {
Object.entries(actions).forEach(([action, handler]) => {
this.registerAction(action, handler);
});
}
/**
* Get registered actions
*/
getRegisteredActions() {
return Array.from(this.actionHandlers.keys());
}
/**
* Handle action event (called by DOM integration)
*/
handleAction(action, element, event, data) {
const handler = this.actionHandlers.get(action);
if (!handler) {
if (this.options.debug) {
console.warn(`[EventBus] No handler registered for action: ${action}`);
}
return;
}
try {
handler.call(element, {
element,
event,
data,
emit: this.emit.bind(this),
emitSync: this.emitSync.bind(this)
});
} catch (error) {
this.handleError(error, `action:${action}`, { element, event, data });
}
}
/**
* Generate unique listener ID
*/
generateListenerId(event) {
return `${event}_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
}
/**
* Update performance stats
*/
updatePerformanceStats(duration) {
const count = this.stats.eventsEmitted;
this.stats.averageEmitTime = (this.stats.averageEmitTime * (count - 1) + duration) / count;
}
/**
* Get statistics
*/
getStats() {
return { ...this.stats };
}
/**
* Reset statistics
*/
resetStats() {
this.stats = {
eventsEmitted: 0,
listenersExecuted: 0,
errorsOccurred: 0,
averageEmitTime: 0,
throttledEvents: 0,
filteredEvents: 0
};
}
/**
* Destroy event bus
*/
destroy() {
this.removeAllListeners();
this.actionHandlers.clear();
this.handlers.clear();
this.middleware = [];
this.throttledEmitters.clear();
this.debouncedEmitters.clear();
if (this.batchTimer) {
clearTimeout(this.batchTimer);
}
}
}
/**
* Create event bus instance
*/
export function createEventBus(options = {}) {
return new EventBus(options);
}
/**
* Global event bus instance
*/
export const globalEventBus = createEventBus();
/**
* Quick access functions for global event bus
*/
export const emit = globalEventBus.emit.bind(globalEventBus);
export const emitSync = globalEventBus.emitSync.bind(globalEventBus);
export const on = globalEventBus.on.bind(globalEventBus);
export const once = globalEventBus.once.bind(globalEventBus);
export const off = globalEventBus.off.bind(globalEventBus);
export const registerAction = globalEventBus.registerAction.bind(globalEventBus);
export const handleAction = globalEventBus.handleAction.bind(globalEventBus);
export default EventBus;
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