runtime/frameworks/legacy/static/life.js

/*
 * 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 config from '../config'
import {
  refresh,
  destroy
} from '../app/ctrl/index'
import { instanceMap } from './map'
import { resetTarget } from '../core/dep'

/**
 * Init config informations for Weex framework
 * @param  {object} cfg
 */
export function init (cfg) {
  config.Document = cfg.Document
  config.Element = cfg.Element
  config.Comment = cfg.Comment
  config.sendTasks = cfg.sendTasks
  config.Listener = cfg.Listener
}

/**
 * Refresh a Weex instance with data.
 *
 * @param  {string} id
 * @param  {object} data
 */
export function refreshInstance (id, data) {
  const instance = instanceMap[id]
  let result
  /* istanbul ignore else */
  if (instance) {
    result = refresh(instance, data)
  }
  else {
    result = new Error(`invalid instance id "${id}"`)
  }
  return result
}

/**
 * Destroy a Weex instance.
 * @param  {string} id
 */
export function destroyInstance (id) {
  // Markup some global state in native side
  if (typeof markupState === 'function') {
    markupState()
  }

  resetTarget()
  const instance = instanceMap[id]
  /* istanbul ignore else */
  if (!instance) {
    return new Error(`invalid instance id "${id}"`)
  }
  destroy(instance)
  delete instanceMap[id]
  // notifyContextDisposed is used to tell v8 to do a full GC,
  // but this would have a negative performance impact on weex,
  // because all the inline cache in v8 would get cleared
  // during a full GC.
  // To take care of both memory and performance, just tell v8
  // to do a full GC every eighteen times.
  const idNum = Math.round(id)
  const round = 18
  if (idNum > 0) {
    const remainder = idNum % round
    if (!remainder && typeof notifyTrimMemory === 'function') {
      notifyTrimMemory()
    }
  }
  return instanceMap
}