65 lines
1.2 KiB
JavaScript
65 lines
1.2 KiB
JavaScript
/**
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* 轻量事件总线：用于 BLE Core 与业务模块之间的事件解耦。
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*/
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export function createEventBus() {
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const listeners = {}
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function on(eventName, handler) {
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if (!listeners[eventName]) {
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listeners[eventName] = new Set()
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}
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listeners[eventName].add(handler)
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// 返回取消订阅函数，方便调用方在页面卸载时回收监听。
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return () => {
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off(eventName, handler)
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}
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}
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function once(eventName, handler) {
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const unsubscribe = on(eventName, (payload) => {
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unsubscribe()
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handler(payload)
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})
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return unsubscribe
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}
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function off(eventName, handler) {
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if (!listeners[eventName]) {
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return
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}
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listeners[eventName].delete(handler)
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}
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function emit(eventName, payload) {
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if (!listeners[eventName]) {
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return
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}
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listeners[eventName].forEach((handler) => {
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try {
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handler(payload)
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} catch (error) {
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console.error('[BLE event handler error]', eventName, error)
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}
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})
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}
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function clear() {
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Object.keys(listeners).forEach((eventName) => {
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listeners[eventName].clear()
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})
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}
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return {
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on,
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once,
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off,
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emit,
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clear
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}
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}
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