How to Define Callbacks in Android?

During the most recent Google IO, there was a presentation about implementing restful client applications. Unfortunately, it was only a high level discussion with no source code of the...

How is Node.js inherently faster when it still relies on Threads internally?

I just watched the following video: Introduction to Node.js and still don't understand how you get the speed benefits. Mainly, at one point Ryan Dahl (Node.js' creator) says that Node.js is...

nginx : Its Multithreaded but uses multiple processes?

I'm trying to understand what makes Nginx so fast, and I have a few questions. As I understand it, Apache either spawns a new process to serve each request OR spawns a new thread to serve each...

How to handle state from external systems functionally?

I recently got into functional programming and I've learned several ways of dealing with some kinds of side effects in a referentially transparent way: the State monad for mutable state like...

How do I prevent ASP.NET from logging authentication failures?

My Windows Azure web role ASP.NET MVC application serves REST API requests on some of the routes and those routes require "basic" authentication. Client programs often fail to authenticate - most...

prevent drop inside a child element when drag & dropping with JS

I've created a simple drag and drop setup, 2 divs that allow a user to drag a child div between the two. It works fine unless a 'child div' is dropped directly inside another. I've been trying to...

express.js 4 and sockets with express router

I'm trying to create a really simple node API using express.js 4 but I need a few 'realtime' events for which I added socket.io. I'm fairly new to both so I'm likely missing something basic but I...

Understanding Netflix Eureka Leases - Service Keeps Unregistering

I keep having this intermittent issue with one of my Spring Cloud Eureka clients, but none of the others. When I start my "NCLSEARCHSERVICE" it registers itself with Eureka, shows "UP" in Eureka...

Is Date.now referential transparent?

DateTime.Now or Date.now is referential transparent? This is one of the controversial topic in a functional programming article in Qiita. First of all, we must be very careful since the word...

Google Pub/Sub to Dataflow, avoid duplicates with Record ID

I'm trying to build a Streaming Dataflow Job which read events from Pub/Sub and write them into BigQuery. According to the documentation, Dataflow can detect duplicate messages delivery if a...

Using *ngIf with a dynamic variable in Angular 2

I was following this example : Angular2.io Example. When selectedHero is null the div element should not be displayed, that works fine, but when I select a hero using click event and selectedHero...

Laravel echo is no listening

i'm from venezuela, i've a problem tryging to integrate laravel echo with a project, i try everything and i wanna receive your help. maybe i'm not working with the right way. i'm trying to use...

Socket.io broadcast to room not working

In a node.js application using "socket.io": "^2.0.4" Socket.io is initialized like this : export let io: any; io = socketio(server, { secure: secure, rejectUnauthorized: false, ...

Error registering service to eureka server

I am trying to register a client to spring-eureka-server, client deregisters just after registering eureka-server logs: 2018-05-13 16:02:47.290 INFO 25557 ---...

RPC framework with API for event loop

Is there RPC framework with good API for external event-loop ? For example, i have my own custom nginx build, and for some reason I want use it as RPC client. Nginx under linux, by default, use...

How to setup flutter_socket_io plugin to work on iOS

I'm trying to listen for events from a socketio server in flutter using the flutter_socket_io plugin. i have followed the guide on plugin page and successfully working on Android. However on iOS...

socket io Possible EventEmitter memory leak detected

I want to remove Listener to avoid this problem in socket io once the event is done. I am getting this error MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 connection...

Socket IO emit events twice

Situation: I'm setting up an express server with socket.io and a client using ReactJS. This is my server: //... another requirement const socket = require("./socket"); const app =...

Calling requests_html or pyppeteer in Python multithreading ErrorError: signal only works in main thread

I probably learned that the error was due to the use of coroutine io in pyppeteer and requests_html, which conflicted with multithreading, but I can't find a way to fix this.I don't speak English...

Can the A20 line still be masked off on Haswell and successors?

Wikipedia quotes this statement from Intel's manual The functionality of A20M# is used primarily by older operating systems and not used by modern operating systems. On newer Intel 64 processors,...

java.lang.NoSuchMethodError: com.google.common.io.ByteStreams.exhaust(Ljava/io/InputStream;)J

I'm getting this "java.lang.NoSuchMethodError: com.google.common.io.ByteStreams.exhaust(Ljava/io/InputStream;)J" error while using ServiceCredentials.fromStream() method. Anyone here faced this...

Writing a custom winston-transport: why to emit logged event?

I'm working on a custom winston transport; documentation (cut&paste follows) is crystal clear... class CustomTransport extends Transport { log(info, callback) { setImmediate(() => { ...

RN webrtc - Remote stream does not always display according to Wifi or mobile network

I’m building a video-call app in react native with react-native-webrtc package and I’m facing some problems when I run the app. Here is the situation (all the code used is below). To test my...

Performance Counters and IMC Counter Not Matching

I have an Intel(R) Core(TM) i7-4720HQ CPU @ 2.60GHz (Haswell) processor. In a relatively idle situation, I ran the following Perf commands and their outputs are shown, below. The counters are...

laravel broadcast redis socket-io, doesn't listen to event

I'm using this tutorial for laravel broadcast with redis and socket-io, https://www.itsolutionstuff.com/post/laravel-broadcast-redis-socket-io-tutorial-example.html. But in the final result, I...

routeChangeNotification and OS Media Reset/Lost not working after .setPreferredInput(...) is called and microphone is unplugged

This question is a broader description of the bug documented here. I'm reproducing the steps below on iPhone 8 and iOS 14.7. How can I achieve my AVAudioSession and AVAudioEngine instances to work...

What is the proper use of SerialPort.BaseStream.BeginRead?

I am having issues with a program that is getting unreliable data from a serial port, and I believe https://www.sparxeng.com/blog/software/must-use-net-system-io-ports-serialport#comments This...

How to send a base64 image from client to server with react-native and socket.io?

In a react-native project, im trying to use websockets (socket.io-client/socket.io) to transfer base64 encoded strings from client to server, and then to another client. what im expecting: the...

What is the fastest way to pass a message between two processes in python?

I'm looking for the fastest way (in terms of latency) to communicate between two processes the fact that an event has occurred. To be more precise I have numpy array in a shared memory where one...

SQLAlchemy ORM events with asyncio

I'm trying to use SQLAlchemy attribute event "set" in asynchronous mode in the same way, as it was for synchronous. async_session = sessionmaker( engine, class_=AsyncSession,...