About identity & privacy

Most complete Identity of a person is defined / determined by different public, restricted or private accessible spheres.

[ to be continued ... ]

It's about creating distributed service oriented communications

Attention:
This article isn't about daily standard electronic communications via network protocols (e.g. email services or shared network folders),  neither about user authentication / authorization nor groupware. 

It's about: 
Implementing or consuming customizable reliable distributed services;
by choosing & implementing a programmable extensible scalable, easily portable, standardized inter-compatible fail-safe resilient communication middleware, that's financially essential for most critical business processes.

For what kind of companies is that useful, important or relevant?
It's relevant for all companies, that consume many crtical data from external partners / service providers; 
then process received & own data inside different departments (maybe in different locations) with different areas of responsibility (e.g. fraud detection, critical real-time scaling of dynamic hardware (memory, harddisks and available CPUs, permanent risk adjustment and last but not least anonymized [General Data Protection Regulation] precise reporting for legal reasons);
finally  and ultimately share processed data to maybe different  external organisations with very deviating requirements, like government fraud reporting agency on one side and partners inside a foundation or joint umbrella organization however.

Overview most common distributed service oriented communication technologies in history

What technologies do you use in your company / organisation or as private person for distributed service oriented communication?

1. antique: [ 1980s ]
• Sun RPC [ remote procedure call ]
2. old: [ around the millennium ]
• DCOM [ Distributed Component Object Model ] 
  see also: ActiveX, DDE, .NET Remoting 
• Java Corba
• message oriented middleware [ mostly XML based ]
• SOAP  / XML based Webservices [ SOAP message ] 
• .NET Webservices + Web Services Enchancements (.asmx .ashx ) 
3. Previous generation: [ since 2010 ]
• WCF [ Windows Communication Foundation ]  by Microsoft .NET
• Swagger [ swagger.io swagger-api ]
• Rest API [ Representational State Transfer ]
• RestFul web api
• Apache CFX [ cxf.apache.org ]
• gRPC [ gRPC Remote Procedure Calls ]
  gRPC [ grpc.io | github.com/grpc ] was initially created by Google

What local software suites / solutions / products and enterprise cloud services are included in your distributed service oriented communication(s workflows)?

1. Microsoft BizTalk Server
2. RabbitMQ [ github.com/rabbitmq ]
• RabbitMQ (Message queue service)
• Messaging with RabbitMQ
3. Amazon Web Services [ aws ]
• S3 REST API
• Rest API getting started 
• deploying a REST API in Amazon API Gateway
4. Azure RestAPI Reference 
• Azure REST API reference
• Design APIs for microservices [ REST vs RPC ]
• REST APIs vs Microservices: The Differences and How They Work Together

[ to be continued ... ]

-

Curch music I like

 I'm left liberal atheist, but I want to show thou, that I like some church music very much.

My favorirtes (church music)

Gregorian Chant (gregorianischer Choral)

https://www.youtube.com/watch?v=t2ANO1xpBaY

https://www.youtube.com/watch?v=m52fDOoLUks

Franz Schubert (deutsche Messe) (1)

Zum Eingang („Wohin soll ich mich wenden“)

Zum Gloria („Ehre, Ehre sei Gott in der Höhe“)

Zum Evangelium und Credo („Noch lag die Schöpfung formlos da“)

Zum Offertorium („Du gabst, o Herr, mir Sein und Leben“)

Zum Sanctus („Heilig, heilig, heilig! Heilig ist der Herr!“)

Nach der Elevation, oder: Nach der Wandlung („Betrachtend Deine Huld und Güte“) (2)

Zum Agnus Dei („Mein Heiland, Herr und Meister“)

Schlussgesang („Herr, Du hast mein Fleh’n vernommen“)

Anhang. Das Gebet des Herrn („Anbetend Deine Macht und Größe“)

Johann Sebastian Bach (H-Moll-Messe) (3)

https://www.youtube.com/watch?v=NCWMUt0KmY4

Bridge Mini-VM for reading XFS, JFS, ext[234], minix, btrfs, reiserfs ot any other non MS filesystem

Howto access  XFS, JFS, ext[234], minix, btrfs, reiserfs ot any other non MS filesystem from Windows 7 - 11 without installing a maybe bogus kernel filesystem driver?

1. Make a Mini-Vm with a totally slack and stripped linux kernel, that is bridged on a VM network adapter. Include all filesystem drivers and needed network adapter & drivers in that kernel and strip / kick out everything other, what's not needed. 
   Make the kernel similiar to a cisco router or PIX firewall kernel.
2. Give the VM direct access to your harddisk, usb-devices, firewire & bluetooth devices.
   
3. Enable the Mini linux VM to reEXport mounted filesystem over smb or nfs.
4. Calculate the memory size, which is needed, that all filesystem mounts and all fs operatons work fast enough with paging and caching. 
5. Choose the best scheduler for that mini-VM.
6. Optimize all ioctl, (f)lush, (f)read, (f)write, (f)seek, (f)open, (f)close and all other filesystem operations.
7. If you are hungry => oprimize the /proc /sys /dev filesystem.

Risk calculation in IT software projects [simplified]

LOW:

Our developers know very good the use case and realized similar use cases very often. It exists a well documented standard library in framework for that use case or an inhouse framework.

MEDIUM:

Our developers principally understand the use case and can imagine well to realize it with a standard or inhouse library.

HIGH:

Our developers principally understand the use case, but never realized something similar. They need some none standard not well tested (and even maybe scanty documented) library to realize it Mr. X / Mrs. Y heared in a former company, that some of her co-workers already used an git open source library for something very similar to the most critical path in implementation for our use case. But that git repository looked more like freak made (that's is possible), rather than a well made university project concerning all security and performance issues including soft & hard limits.

(After contacting the author(ess) of git open source project, (s)he means: "I did this 9 years ago, you have to port it to the newest version of the framework and it will work only slacky with over 100.000 main data records! Feel free to implement a caching mechanism and re-deliver it to my git project tree.)

EPIC:

Our developers don't or won't understand that special use case.

They ask: "Are you crazy or on crystal meth?", when receiving the requirements.

There doesn't exist any library in the company's programming language for that. Maybe some international legends like Fefe or Alan Cox realized something similar in a totally different programming language.

IMPOSSIBLE:

Even Fefe, Linus or Alan (Cox) say: "This is science fiction!"

A crazy example of a Lazy singleton as strangest singelton pattern ever

A crazy example of a Lazy<T> singelton with privat constructor inherited form an protected DoubleLockInstance singelton with private empty and protected parameter constructor inherited form an abstract singelton template with protected constructor.

Application settings example:

BaseSets for basic settings as abstract singelton base

using System;using System.Reflection;
namespace work.darkstar.blog{    /// <summary>    /// abstract class BaseSets     /// </summary>    [Serializable]    public abstract class BaseSets    {        public string AssemblyName { get => Assembly.GetExecutingAssembly().GetName().ToString(); }        public string Copyright { get => "GNU LIGHT GENERAL PUBLIC LICENSE 2.0 LGPL"; }        public virtual string AssemblyCom { get => "darkstar.work"; }
        public virtual int AppId { get; protected set; }        public virtual string AppName { get; protected set; }        /// <summary>        /// protected empty constructor for inheritable singelton        /// </summary>        protected BaseSets() { }         /// <summary>        /// protected parameterized constructor for inheritable singelton        /// </summary>        protected BaseSets(int appId, string appName)        {            AppId = appId;  AppName = appName;        }    }}

AppSets for application settings as instancable singelton default app sets (settings):

using Microsoft.Win32;
using System;
using System.Reflection;
using System.Windows.Forms;

namespace work.darkstar.blog
{    public interface IAppSetsDomain : IAppDomainSetup    {        System.AppDomain AppCurrentDomain { get; }    }    /// <summary>
    /// application settings singelton    /// </summary>
    [Serializable]    public class AppSets : BaseSets, IAppDomainSetup
    {
        private static AppSets _appSets;        private static object  _initLock, _sndLock;
        protected static AppSets DoubleLockInstance {            get {                _sndLock = new System.Object();                lock (_sndLock)  {                    if (_initLock != null) _initLock = null;
                    if (_initLock == null) _initLock = new System.Object();                    lock (_initLock) {                       if (_appSets == null)                            _appSets = new AppSets();                    }                    return _appSets;                }            }        }        public string CodeBase { get => Assembly.GetExecutingAssembly().CodeBase; }
        public string BaseDirectory { get => AppDomain.CurrentDomain.BaseDirectory; }        public string AppDataPath { get => Application.CommonAppDataPath; }        public RegistryKey AppDataRegistry { get => Application.CommonAppDataRegistry; }

        #region implementing interface IAppSetsDomain, IAppDomainSetup        
        public AppDomain AppCurrentDomain { get => AppDomain.CurrentDomain; }
        public string ApplicationBase { get ; set; }
        public string ApplicationName{ get ; set; }
        public string CachePath{ get ; set; }
        public string ConfigurationFile{ get ; set; }
        public string DynamicBase { get ; set; }
        public string LicenseFile { get ; set; }
        public string PrivateBinPath { get ; set; }
        public string PrivateBinPathProbe { get ; set; }
        public string ShadowCopyDirectories { get ; set; }
        public string [] ShadowCopyDirectoryArray { 
                get => ShadowCopyDirectories.Split(';'); }
        public bool FilesShadowCopy { get ; set; }
        public string ShadowCopyFiles { 
            get => FilesShadowCopy.ToString().ToLower();
            set { FilesShadowCopy = Boolean.Parse(value); }
        }
        public bool FilesShadowCopy{ get ; set; }
        public string ShadowCopyFiles{ get => FilesShadowCopy.ToString() ; set; }
        #endregion implementing interface IAppSetsDomain, IAppDomainSetup        

        /// <summary>        /// static constructor         /// </summary>        static AppSets() {
            _initLock = new System.Object();
            lock (_initLock) { _appSets = new AppSets(); }
        }
        /// <summary>        /// private empty constructor         /// </summary>        private AppSets() {            AppId = AppDomain.CurrentDomain.Id;            AppName = Assembly.GetExecutingAssembly().FullName;                      }
        /// <summary>        /// protected parameter constructor         /// </summary>        protected AppSets(int appId, string appName) : base(appId, appName) { }
    }}

Sealed MyAppSets for application specialized appSets as Lazy<T> singelton:

using System;
using System.IO;
using System.Security;/* ... */using Microsoft.Win32;/* ... */using Windows.Forms;
namespace work.darkstar.blog
{
    /// <summary>
    /// my application settings singelton
    /// </summary>
    [Serializable]
    public sealed class MyAppSets : AppSets
    {
        /// <summary>
        /// private static readonly Lazy<T> self containing private real singelton unique instance
        /// </summary>
        private static readonly Lazy<MyAppSets> _instance = 
            new Lazy<MyAppSets>(() => new MyAppSets(AppDomain.CurrentDomain.Id, "LazyApp"));

        /// <summary>
        /// static instance getter for Singeltion
        /// </summary>
        public static MyAppSets Instance { get => _instance.Value; }

        public string UserAppDataPath { get => Application.UserAppDataPath; }
        public RegistryKey UserAppDataRegistry { get => Application.UserAppDataRegistry; }


        /// <summary>
        /// private constructor with partameters for sealed unique singelton
        /// </summary>
        private MyAppSets(int appId, string appName) : base(appId, appName) { }        

        /// <summary>
        /// Gets name value pair for application registry key saved in registry scope for current user
        /// </summary>
        /// <param name="regName">registry name identifier</param>
        /// <param name="subKey">subKey in scope of current user</param>
        /// <returns>object value</returns>
        /// <exception cref="ApplicationException">application exception with detailed inner exception</exception>
        public object GetUserRegValuey(string regName, string subKey = null) {
            object o = null;
            RegistryKey key = null;
            Exception ex = null;
            try {
                key = (subKey == null) ? UserAppDataRegistry 
                    : UserAppDataRegistry.OpenSubKey(subKey, false);
                o = key.GetValue(regName);
            }
            catch (SecurityException sex) { ex = sex; }
            catch (ObjectDisposedException odEx) { ex = odEx; }
            catch (UnauthorizedAccessException uaEx) { ex = uaEx; }
            catch (IOException ioeEx) { ex = ioeEx; }
            finally {
                if (key != null && subKey != null)
                    key.Close();
                if (ex != null) throw (new ApplicationException("Error accessing registy key: " + 
                    $"{UserAppDataRegistry}\t name: {regName}\t subkey: {subKey}", ex));            }
            return o;
        }

        /// <summary>
        /// Set Value for UserAppDataRegistry
        /// </summary>
        /// <param name="regName">registry name </param>
        /// <param name="value"value to set></param>
        /// <param name="subKey">subKey</param>
        /// <returns>void means nothing</returns>
        /// <exception cref="ApplicationException">application exception with detailed inner exception</exception>
        public void SetUserReg(string regName, object value, string subKey = null) {
            RegistryKey key = null;
            Exception ex = null;
            try {
                key = (subKey == null) ? UserAppDataRegistry 
                    : UserAppDataRegistry.OpenSubKey(subKey, true);
                key.SetValue(regName, value);
            } catch (Exception anyEx) {
                ex = new ApplicationException($"Error setting value=" +
                  $"{value} for name={regName} inside registry key: {key.Name}", 
                  anyEx);
            } finally {
                if (key != null && subKey != null)
                    key.Close();
                if (ex != null) throw ex;
            }
        }
    }
}

Accessing MyAppSets singelton inside any entity, framework,  helper, [...] class

using System; /*  ... */
using work.darkstar.blog;



public class MyEntity : IAppSetsDomain { 

  /* [ ... ]  */ 
  /* [Inject] */ 
  /* [ ... ]  */

  public AppDomain AppCurrentDomain {
    get => MyAppSets.Instance.AppCurrentDomain;
    set => MyAppSets.Instance.AppCurrentDomain = value;
  }
  /* ... */
}

some ideas to Azure & Microsoft SQL Servers [Draft]

What is missing?

It's missing, that we have unfortunatley no consistently implementation for Active Directory (see also: LDAPS, X.500) on Micrsoft SQL-Server.

How fast are Linked Servers & Distributed Transaction coordinator

Trust me, they are really fast and OAUTH and Azure Auth would be implemented in some weeks, if MS put some lower evangelists at work!

To be continued ...