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'use strict' const Dispatcher = require('./dispatcher') const { ClientDestroyedError, ClientClosedError, InvalidArgumentError } = require('./core/errors') const { kDestroy, kClose, kDispatch } = require('./core/symbols') const kDestroyed = Symbol('destroyed') const kClosed = Symbol('closed') const kOnDestroyed = Symbol('onDestroyed') const kOnClosed = Symbol('onClosed') class DispatcherBase extends Dispatcher { constructor () { super() this[kDestroyed] = false this[kOnDestroyed] = [] this[kClosed] = false this[kOnClosed] = [] } get destroyed () { return this[kDestroyed] } get closed () { return this[kClosed] } close (callback) { if (callback === undefined) { return new Promise((resolve, reject) => { this.close((err, data) => { return err ? reject(err) : resolve(data) }) }) } if (typeof callback !== 'function') { throw new InvalidArgumentError('invalid callback') } if (this[kDestroyed]) { queueMicrotask(() => callback(new ClientDestroyedError(), null)) return } if (this[kClosed]) { if (this[kOnClosed]) { this[kOnClosed].push(callback) } else { queueMicrotask(() => callback(null, null)) } return } this[kClosed] = true this[kOnClosed].push(callback) const onClosed = () => { const callbacks = this[kOnClosed] this[kOnClosed] = null for (let i = 0; i < callbacks.length; i++) { callbacks[i](null, null) } } // Should not error. this[kClose]() .then(() => this.destroy()) .then(() => { queueMicrotask(onClosed) }) } destroy (err, callback) { if (typeof err === 'function') { callback = err err = null } if (callback === undefined) { return new Promise((resolve, reject) => { this.destroy(err, (err, data) => { return err ? /* istanbul ignore next: should never error */ reject(err) : resolve(data) }) }) } if (typeof callback !== 'function') { throw new InvalidArgumentError('invalid callback') } if (this[kDestroyed]) { if (this[kOnDestroyed]) { this[kOnDestroyed].push(callback) } else { queueMicrotask(() => callback(null, null)) } return } if (!err) { err = new ClientDestroyedError() } this[kDestroyed] = true this[kOnDestroyed].push(callback) const onDestroyed = () => { const callbacks = this[kOnDestroyed] this[kOnDestroyed] = null for (let i = 0; i < callbacks.length; i++) { callbacks[i](null, null) } } // Should not error. this[kDestroy](err).then(() => { queueMicrotask(onDestroyed) }) } dispatch (opts, handler) { if (!handler || typeof handler !== 'object') { throw new InvalidArgumentError('handler must be an object') } try { if (!opts || typeof opts !== 'object') { throw new InvalidArgumentError('opts must be an object.') } if (this[kDestroyed]) { throw new ClientDestroyedError() } if (this[kClosed]) { throw new ClientClosedError() } return this[kDispatch](opts, handler) } catch (err) { if (typeof handler.onError !== 'function') { throw new InvalidArgumentError('invalid onError method') } handler.onError(err) return false } } } module.exports = DispatcherBase