66 lines
1.4 KiB
JavaScript
66 lines
1.4 KiB
JavaScript
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'use strict'
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const EventEmitter = require('node:events')
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class Dispatcher extends EventEmitter {
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dispatch () {
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throw new Error('not implemented')
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}
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close () {
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throw new Error('not implemented')
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}
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destroy () {
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throw new Error('not implemented')
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}
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compose (...args) {
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// So we handle [interceptor1, interceptor2] or interceptor1, interceptor2, ...
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const interceptors = Array.isArray(args[0]) ? args[0] : args
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let dispatch = this.dispatch.bind(this)
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for (const interceptor of interceptors) {
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if (interceptor == null) {
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continue
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}
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if (typeof interceptor !== 'function') {
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throw new TypeError(`invalid interceptor, expected function received ${typeof interceptor}`)
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}
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dispatch = interceptor(dispatch)
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if (dispatch == null || typeof dispatch !== 'function' || dispatch.length !== 2) {
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throw new TypeError('invalid interceptor')
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}
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}
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return new ComposedDispatcher(this, dispatch)
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}
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}
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class ComposedDispatcher extends Dispatcher {
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#dispatcher = null
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#dispatch = null
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constructor (dispatcher, dispatch) {
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super()
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this.#dispatcher = dispatcher
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this.#dispatch = dispatch
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}
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dispatch (...args) {
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this.#dispatch(...args)
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}
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close (...args) {
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return this.#dispatcher.close(...args)
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}
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destroy (...args) {
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return this.#dispatcher.destroy(...args)
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}
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}
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module.exports = Dispatcher
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