Wicket vs Vaadin

I am torn between Wicket and Vaadin. I am starting a micro-isv and need to make a choice of web framework. I have narrowed down my choices to Wicket and Vaadin. I have used both frameworks and I...

Great flask / other python micro framework code I could learn from

I'd like to look at some good web-app code written in python, just so I can learn some of the patterns / see how I can improve my code. I've already googled around a bit, used google code search...

Using BlockingCollection<T>: OperationCanceledException, is there a better way?

I'm making use of the (frankly great) BlockingCollection<T> type for a heavily multithreaded, high-performance app. There's a lot of throughput through the collection and on the micro-level it's...

Is this how lazy connecting of a database connection is supposed to be?

So I did some research on good way of connecting to the database in OOP. If you look at my connect() method in my database model, I am only connecting when I'm about to query and if there is no...

install redis on aws micro instance

I need to install redis in amazon cloud. I need it as a part of my npm module kue (deployment). Can anyone link me step by step tutorial or explain how to do it, considering the fact that I'm not...

How to deploy an embedded server to Elastic-Beanstalk?

We have developed multiple micro-services using DropWirzard to have embedded jetty servers for each micro-service. Has anyone had experience with deploying an embedded server to elastic-beanstalk...

How to clear all the elements of array in C?

volatile static uint8_t buffer[16]; void ResetBuffer(){ for(int i=strlen((char*)buffer);i>=0;i--) buffer[i]='\0'; } The buffer variable must be always used in micro controller, so I've...

What are weak functions and what are their uses? I am using a stm32f429 micro controller

Wikipedia says: A weak symbol denotes a specially annotated symbol during linking of Executable and Linkable Format (ELF) object files. By default, without any annotation, a symbol in an object...

Kubernetes pod autoscaling out of sync with Instance Group autoscaling

I have a simple wordpress site defined by the ReplicationController and Service below. Once the app is deployed and running happily, I enabled autoscaling on the instance group created by...

sklearn.metrics.roc_curve for multiclass classification

I want to use sklearn.metrics.roc_curve to get the ROC curve for multiclass classification problem. Here gives a solution on how to fit roc to multiclass problem. But I do not understand what the...

setTimeout is working only once. Why?

<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <script> function move(){ var i =10; var demo =...

What Docker image size is considered 'too large'?

In my previous company, we adopted a micro-service architecture and used Docker to implement it. The average size of our Docker images were ~300MB - ~600MB. However my new company is using Docker...

AWS/Cloudformation: How to export/import parameter value to another stack (YAML)

I have a simple question. I am testing export/import of values in cloud formation. Question is: How to create resources based on linked conditions from another stack? I think I should import the...

LogStash - Failed to instantiate type net.logstash.logback.appender.LogstashTcpSocketAppender

I am working on Springboot Microservcies & for monitoring Im using ELK Stack. I am using docker containers for running ELK as per this guide. ELK is up and running, I am starting my Logstash...

STM32 code uploads successfully but doesn't run

I'm new to STM32 and I followed the instructions here in order to program my first stm32f103c8t6 board in Ubuntu. Here is the code which I added to the source code: int main(void) { /* USER CODE...

Implementation of Message Bus C# microservices

We have few micro services created in .net core 1.0, we are following CQRS pattern and we are also using swagger which list all api's, we have a requirement were in we need to implement Message...

How to reduce cost of AWS website hosting (EC2, RDS)

I am new to AWS, so I have a few questions. I am hosting one static website, and one dynamic website from a single AWS t2.micro EC2 instance. I am also hosting a small (~5,000 entries) MySQL...

Trend OfficeScan PowerShell or Batch Script

I work for a healthcare provider as an analyst. We receive many CDs containing confidential patient data and one of my daily tasks is to scan the CD for viruses. I use Trend's OfficeScan tool for...

What is Upstream and Downstream services in a Micro-service based architecture?

I have heard of the terms "Upstream Services" and "Downstream Services" in general terms but i came across some articles on micro-service architecture where they have used these terms , however i...

Paperclip alternative that works in Rails 4 and Rails 6

Background We have a legacy, monolith Rails 4.2 project. Call it "Classic." "Classic" uses Paperclip for dealing with the storage of assets (photos, attachements, etc.) in a 3rd-party system. We...

Building a docker image gives errors when NODE_ENV=production in use (Could not find a declaration file for module)

When we have in our Dockerfile: ENV NODE_ENV=production we get the below errors for our yarn install command: Step #0: Step 7/9 : RUN yarn install; npm i -g rimraf typescript; yarn build:prod Step...

Error launching source instance: UnauthorizedOperation: You are not authorized to perform this operation

I am trying to lunch EC2 instance by using Terraform and I am getting the following error: Error launching source instance: UnauthorizedOperation: You are not authorized to perform this...

decision_function and precidt_proba yield different ROC graphs in sklearn

I'm following the ROC graph example given in sklearn docs here (you can download a Jupyter notebook from here). It generates a ROC graph for the multi-class problem over the Iris dataset. In the...

SDL2 does not see joystick, but OS does

I am using Ubuntu 18.0.4.4 LTS with a home-brew Arduino-based USB joystick attached. The OS sees the device at both /dev/input/js0 and /dev/input/event5 and jstest works with it: $ jstest...

What is the difference between model.fit(X,y), and model.fit(train_X, train_y)

When I'm studying kaggle micro course (machine learning), I learned how to find the optimum leaf size (by finding the minimum MAE). However, I got different MAE value when I put the optimum leaf...

AWS Cloud9 - no space left on device

Each time I start a new environment, after a few weeks of work I get /home/ubuntu/.rvm/gems/ruby-2.7.1/gems/rack-2.2.3/lib/rack/server.rb:433:in `close': No space left on device @...

Buildroot / Busybox and OTG Ethernet Adapter at Raspberry Pi Zero -> Missing ethernet interface

I have a Raspberry Pi Zero with an OTG micro USB hub with network adapter included. The adpater works fine if I use the Raspbian: $ lsusb Bus 001 Device 003: ID 0fe6:9700 ICS Advent DM9601 Fast...

Ts-node : SyntaxError: Cannot use import statement outside a module

I was trying to use the top level in the project and saw that it was necessary to change the module from tscofnig to esnext or system, but for some reason my ts-node's error. And I already put the...

How to use Webpack Module Federation plugin with create-react-app without ejecting

Is there a way to use module federation using create-react-app without ejecting? I want to convert my existing react applications(created using CRA) to micro-frontends.

Rollup + React 17 with new JSX Transform - "React is not defined"

I'm trying to prototype a microfrontend architecture with Rollup and a couple of create-react-app applications. However when I locally yarn link my external app with the container app, I run into...