yevhen

"""
This gist shows how to run asyncio loop in a separate thread.
It could be useful if you want to mix sync and async code together.
Python 3.7+
"""
import asyncio
from datetime import datetime
from threading import Thread
from typing import Tuple, List, Iterable

yevhen

Dealing elements

There's a function in clojure.core called partition-all. It creates subsequences of a given maximum size.

(partition-all 3 [1 2 3 4 5 6 7 8]);=> [[1 2 3] [4 5 6] [7 8]]

Notice that the first sequence gets the first three elements, the second sequence gets the second three elements, etc. We could get the original sequence again by concatenating the sequences back together.

yevhen

You should not use the Open SSH client that comes with Git for Windows. Instead, Windows 10 has its own implementation of Open SSH that is integrated with the system. To achieve this:

1. Start the ssh-agent from Windows Services:

• Type Services in the Start Menu or Win+R and then type services.msc to launch the Services window;
• Find the OpenSSH Authentication Agent in the list and double click on it;
• In the OpenSSH Authentication Agent Properties window that appears, choose Automatic from the Startup type: dropdown and click Start from Service status:. Make sure it now says Service status: Running.

2. Configure Git to use the Windows 10 implementation of OpenSSH by issuing the following command in Powershell:

git config --global core.sshCommand C:/Windows/System32/OpenSSH/ssh.exe

yevhen

; Autohotkey Capslock Remapping Script 
; Danik
; More info at http://danikgames.com/blog/?p=714
; danikgames.com
; 
; Functionality:
; - Deactivates capslock for normal (accidental) use.
; - Hold Capslock and drag anywhere in a window to move it (not just the title bar).
; - Access the following functions when pressing Capslock: 
;     Cursor keys           - J, K, L, I

yevhen

HashSet that preserves insertion order or .NET implementation of LinkedHashSet

Many people naively assume an ordinary .NET HashSet preserves insertion order. Indeed HashSet accidentally preserves insertion order until you remove and re-add some elements. There is such a data structure in Java - LinkedHashSet which respects order and has O(1) RW times.

No, I did not find a (working) corresponding implementation in .NET. That's I wrote this one.

The implementation uses linked list in combination with dictionary to define the iteration, ordering and at the same time allow O(1) removal.

The order is not affected if an element is re-inserted into the set it retains it's old position.

yevhen

using Microsoft.AspNet.Mvc.ApplicationModels;
using Microsoft.AspNet.Mvc.ModelBinding;
using System;

namespace Foo.Web.Infrastructure.Conventions
{
    public class ComplexTypeConvention : IActionModelConvention
    {
        public void Apply(ActionModel action)
        {

yevhen

using Microsoft.AspNet.Mvc.ApplicationModels;
using Microsoft.AspNet.Mvc.ModelBinding;
using System;

namespace Foo.Web.Infrastructure.Conventions
{
    public class ComplexTypeConvention : IActionModelConvention
    {
        public void Apply(ActionModel action)
        {

yevhen

readonly HttpClient http = new HttpClient();

async Task<DownloadResult[]> DownloadUrlsAsync(string path) =>
    await Task.WhenAll(File.ReadLines(path).Select(DownloadAsync));

async Task<DownloadResult> DownloadAsync(string url)
{
    var time = Stopwatch.StartNew();

    try

yevhen

// https://stackoverflow.com/questions/46467275/weird-stack-trace-growth-with-async-await-and-taskcompletionsource

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Threading;
using System.Threading.Tasks;

yevhen

/*
 This represents simple durable task which do some work in background. 
 The task is automatically saved after every successful transition. 
 It is modeled as workflow with the following transitions:
   1. Initial -> Start -> Started 
      Accept user request and start preparation
   2. Started -> Prepared -> Running
      On activation of Started it schedules a one-off timer to delay actual execution of Prepare 
      to finish previous user request and return control to the caller (Orleans is RPC, so it's the hack)
   3. Running -> Executed -> Running