callback

单线程+多任务异步协程

由 喜欢而已 提交于 2020-01-16 16:15:02
1.基础概念 1.协程 　　- 在函数（特殊的函数）定义的时候，如果使用了async修饰的话，则改变函数调用后返回一个协程对象，并且函数内部的实现语句不会被立即执行。 2.任务对象 　　- 任务对象就是对协程对象的进一步封装，任务对象==高级的协程对象==特殊的函数 　　- 任务对象必须要注册到事件循环对象中 　　- 给任务对象绑定回调函数：爬虫的数据解析中 3.事件循环 　　- 当作是一个容器，容器中必须存放任务对象 　　- 当启动事件循环对象后，则事件循环对象会对其内部存储任务对象进行一步的执行 4.aiohttp 　　 - 支持异步网络请求的模块 协程 import asyncio def callback(task): # 作为任务对象的回调函数 print('i am callback and ', task.result()) # task.result是用来接收特殊函数的返回值 async def test(): print("i am test") return "123" c = test() # 封装了一个任务对象 task = asyncio.ensure_future(c) task.add_done_callback(callback) # 创建一个事件循环的对象 loop = asyncio.get_event_loop() loop.run_until

Twilio - Validating Incoming Callback Request - Java

由 社会主义新天地 提交于 2020-01-16 10:55:30
问题 When Twilio invokes a callback method to fetch the TwiML <Say> for Voice, I see that Twilio sets "x-twilio-signature" in the HTTP header. I need to verify that the actual request came from Twilio. I have a simple war file running on Tomcat and the app is built using Spring. I did something like the following: //Get the TwilioUtils object initialized TwilioUtils twilioUtils = new TwilioUtils("******myAuthToken"); //Get the URL from HttpRequest String url = httpRequest.getRequestURL().toString(

Twilio - Validating Incoming Callback Request - Java

由 谁说胖子不能爱 提交于 2020-01-16 10:52:10
问题 When Twilio invokes a callback method to fetch the TwiML <Say> for Voice, I see that Twilio sets "x-twilio-signature" in the HTTP header. I need to verify that the actual request came from Twilio. I have a simple war file running on Tomcat and the app is built using Spring. I did something like the following: //Get the TwilioUtils object initialized TwilioUtils twilioUtils = new TwilioUtils("******myAuthToken"); //Get the URL from HttpRequest String url = httpRequest.getRequestURL().toString(

Callbacks from a class method (C++)

由 和自甴很熟 提交于 2020-01-16 09:00:56
问题 I have a Button class. When I click this button, it's selected() method is called. //Button.cpp void Button::selected(){ //Do Something } //Player.cpp void Player::Jump(){ //Jump! } I also have a Player class. I wanted to make it so that when I click the button, the player method's Jump() is called. I suppose I could just link the Player class with the button. But then I realized that the button class is going to have many other uses, and not just letting my player jump. (ie: a menu selector?

How can you use a callback to guarantee sequential execution?

由 喜夏-厌秋 提交于 2020-01-16 08:37:07
问题 I am trying to wrap my head around callbacks and I do not understand how callbacks guarantee that a statement will execute after(in terms of time) another statement which takes an unknown amount of time. I do not care about promises,await,async, etc but just plain callbacks as I am trying to learn. For example below, my method will execute the callback before the unknown time event has occured. I can see how callbacks can be used to execute something because an event occurred but not how they

AURenderCallbackStruct in Swift

由 六眼飞鱼酱① 提交于 2020-01-16 03:13:20
问题 I have an Objective-C example to an AURenderCallbackStruct, and I would like to do one in swift. I read it's not possible, is that correct? Thank you. 回答1: It's possible. Use the following code for your Audio Unit settings. init() { var status: OSStatus do { try AVAudioSession.sharedInstance().setPreferredIOBufferDuration(preferredIOBufferDuration) } catch let error as NSError { print(error) } var desc: AudioComponentDescription = AudioComponentDescription() desc.componentType =

Getting the current status of process/service anytime the activity starts

由 江枫思渺然 提交于 2020-01-16 01:03:23
问题 I have made the intent service and its all working fine. I have made the interfaces and made call backs. What call back does , it receives 3 following messages : Service Start: When this message arrives, my "Start Service" button changes into "Stop Service" button. Service Finished: when this message arrives my button gets disappear Error: when this message arrives my button change into the "Error" button. The call back is working perfectly. now I have following problems noticed when testing.

redirect localhost instead of myserver.org:3000/login/callback

由 微笑、不失礼 提交于 2020-01-16 00:41:48
问题 being redirected all the time to my localhost-server, instead of myserver.org:3000/login/callback to localhost:3000/login/callback do not understand why and where from here part of my code: app.get('/', function(req, res){ res.render('index', { user: req.user }); }); app.get('/account', ensureAuthenticated, function(req, res){ res.render('account', { user: req.user }); }); app.get('/login', passport.authenticate('saml', { failureRedirect: '/', failureFlash: true }), function(req, res) {

js数组方法

由 半腔热情 提交于 2020-01-15 20:40:34
1、array.from :方法就是将一个类数组对象或者可遍历对象转换成一个真正的数组。 Array.prototype.slice.call(arguments);数组的slice方法可以将“类似数组的对象”变成真正的数组 伪数组(函数的arguments对象,大多数 DOM 元素集,字符串) 这个东西就是把一些集合，或者长的像数组的伪数组转换成真的数组，比如arguments，js选择器找到dom集合,还有对象模拟的数组 返回的是一个数组 将一个类数组对象转换为一个真正的数组，必须具备以下条件： 1）该类数组对象必须具有length属性，用于指定数组的长度。如果没有length属性，那么转换后的数组是一个空数组。 2）该类数组对象的属性名必须为数值型或字符串型的数字 　　ps: 该类数组对象的属性名可以加引号，也可以不加引号 Array.from还可以接受第二个参数，作用类似于数组的map方法，用来对每个元素进行处理，将处理后的值放入返回的数组。 let arr = [12,45,97,9797,564,134,45642] let set = new Set(arr) console.log(Array.from(set, item => item + 1)) // [ 13, 46, 98, 9798, 565, 135, 45643 ] 将字符串转换为数组： let

布局还能异步加载？AsyncLayoutInflater一点小经验送给你

由 余生长醉 提交于 2020-01-15 19:22:45
目录 前言 关于布局加载的两大性能瓶颈，通过 IO操作 将XML加载到内存中并进行解析和通过 反射 创建View。当xml文件过大或页面文件过深，布局的加载就会较为耗时。我们知道，当主线程进行一些耗时操作可能就会导致页面卡顿，更严重的可能会产生ANR，所以我们能如何来进行布局加载优化呢？解决这个问题有两种思路，直接解决和侧面缓解。直接解决就是不使用IO和反射等技术（这个我们会在下一节进行介绍）。侧面缓解的就是既然耗时操作难以避免，那我们能不能把耗时操作放在子线程中，等到 inflate 操作完成后再将结果回调到主线程呢？答案当然是可以的，Android为我们提供了 AsyncLayoutInflater 类来进行异步布局加载。 AsyncLayoutInflater用法 AsyncLayoutInflater 的使用非常简单，就是把 setContentView 和一些view的初始化操作都放到了 onInflateFinished 回调中 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); new AsyncLayoutInflater(this).inflate(R.layout.activity_main,null, new
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