clemensv

Resolving Paradoxical Constraints in JSON Schema

Introduction

JSON Schema is a versatile tool for defining the structure of JSON data and ensuring its validation. However, as powerful as it is, complex scenarios can sometimes lead to paradoxical constraints, especially when used in combination with code generation tools. In this article, we'll take an in-depth look at one such paradox that emerged while defining message structures for various protocols and discuss a practical solution.

The Problem Statement

Imagine a system where messages are passed using different protocols, such as AMQP, HTTP, MQTT, Kafka, and CloudEvents. Each protocol has a distinct message structure but shares certain common attributes. These shared attributes are consolidated in a base message definition, called definition in our JSON Schema.

mtds

Virtual Networking on Linux

In the Linux Kernel, support for networking hardware and the methods to interact with these devices is standardized by the socket API:

                +----------------+
                |   Socket API   |
                +-------+--------+
                        |
User space              |

ReubenBond

    
    using System;
    using System.Collections.Concurrent;
    using System.Fabric.Replication;
    using System.Reflection;
    using System.Reflection.Emit;

    using Microsoft.ServiceFabric.Data;
    internal static class TransactionExtensions
    {

sbedford

##################################################################
### The following parameters are provided by Octopus Deploy.  ###
###    Uncomment these with default values for testing.       ###
#################################################################

#$SSRSReportServerUrl = "http://ssrs/reportserver/reportservice2005.asmx"
#$SSRSDynamicDataSourceCredentialsUsername = ""
#$SSRSDynamicDataSourceCredentialsPassword = ""
#$SSRSReportFolder = "Project Folder"
#$SSRSSharedDataSourcePath = "/Data Sources/dsShared"

weapp

error_page 500 /500.html;
location /500.html{
    return 500 '{"error": {"status_code": 500,"status": "Internal Server Error"}}';
}

error_page 502 /502.html;
location /502.html{
    return 502 '{"error": {"status_code": 502,"status": "Bad Gateway"}}';
}

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

mattbarrett

public static IObservable<T> Conflate<T>(this IObservable<T> source, TimeSpan minimumUpdatePeriod, IScheduler scheduler)
{
    return Observable.Create<T>(observer =>
    {
        // indicate when the last update was published
        var lastUpdateTime = DateTimeOffset.MinValue;
        // indicate if an update is currently scheduled
        var updateScheduled = new MultipleAssignmentDisposable();
        // indicate if completion has been requested (we can't complete immediatly if an update is in flight)
        var completionRequested = false;

AArnott

public static class AwaitExtensions
{
    /// <summary>
    /// Provides await functionality for ordinary <see cref="WaitHandle"/>s.
    /// </summary>
    /// <param name="handle">The handle to wait on.</param>
    /// <returns>The awaiter.</returns>
    public static TaskAwaiter GetAwaiter(this WaitHandle handle)
    {
        Contract.Requires<ArgumentNullException>(handle != null);