| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| import { decodePrimitive } from './normalize' |
| |
| /** |
| * For general callback management of a certain Weex instance. |
| * Because function can not passed into native, so we create callback |
| * callback id for each function and pass the callback id into native |
| * in fact. And when a callback called from native, we can find the real |
| * callback through the callback id we have passed before. |
| */ |
| export default class CallbackManager { |
| constructor (instanceId) { |
| this.instanceId = instanceId |
| this.lastCallbackId = 0 |
| this.callbacks = {} |
| } |
| add (callback) { |
| this.lastCallbackId++ |
| this.callbacks[this.lastCallbackId] = callback |
| return this.lastCallbackId |
| } |
| remove (callbackId) { |
| const callback = this.callbacks[callbackId] |
| delete this.callbacks[callbackId] |
| return callback |
| } |
| consume (callbackId, data, ifKeepAlive) { |
| const callback = this.callbacks[callbackId] |
| if (typeof ifKeepAlive === 'undefined' || ifKeepAlive === false) { |
| delete this.callbacks[callbackId] |
| } |
| if (typeof callback === 'function') { |
| return callback(decodePrimitive(data)) |
| } |
| return new Error(`invalid callback id "${callbackId}"`) |
| } |
| close () { |
| this.callbacks = {} |
| } |
| } |