DeepTransaction

Write better code with the help of steps which are wrapped in a transaction. Available on Nuget here : #.Net Core - https://www.nuget.org/packages/DeepTransactionCore/ #.Net - https://www.nuget.org/packages/DeepTransaction/

Simple Example of usage:

 dynamic context = new TransactionContext();
            context.Name = "Jhonny Cash";
            context.Age = 25;

var response = TransactionWorker.Define("Insert and return a person")
                .AddStep<AddPersonStep>()
                .AddStep<GetPersonStep>()
                .Process(context);

A transaction has a collection of steps. Each step can resolve a piece of your code.

The AddPersonStep step can look like this:

  public class AddPersonStep : ITransactionStep
      {
          private string _name;
          private int _age;
  
  
          public void Before(dynamic input)
          {
              _name = input.Name;
              _age = input.Age;
          }
  
          public TransactionContext Execute(dynamic input)
          {
              using (var repo = new ExtraContext())
              {
                  var person = new Person() {Age = _age, Name = _name};
                  repo.Persons.Add(person);
  
                  repo.SaveChanges();
              }
  
              return input;
          }
      }

A step must implement ITransactionStep and will override two methods: (Before and Execute). As you can see the input and output is dynamic because we must take advantage of this feature and not write boiler plate code.

The workflow for a step is:

1. Call Before method - here you can extract the params for the context and validate the input parameters
2. Call Execute method - which will execute the business logic

Installation:

1. On your solution navigate to package manager console and execute: Install-Package DeepTransaction
2. We need to hook with your dependency injection module:

   • Create a new class which will implement IDependencyResolver:

            public class RegisterIoc : IDependencyResolver
            {
                public TOut Resolve<TOut>()
                {
                    return Container.Instance.Resolve<TOut>();
                }
            }
     

   • We need to implement Get method with your dependency injection module. In this case the DI module is Unity

   • As a next step we need to register the newly created class to the framework (This would be a good idea to put it into the bootstrap class from your application)

           DeepBootstrapper.MapResolver(new RegisterIoc());
     

Advanced scenarios:

In case you want reuse your transactions in other transactions it can be done very easy:

  public class FirstTransaction : BaseTransaction
      {
          public FirstTransaction() : base("My Transaction")
          {
              this.AddStep<Step3>().AddStep<Step4>();
          }
      }

We must inherit BaseTransaction and in the constructor we can add the steps needed for the transaction.

The usage would look like this (like a normal step):

 var response = TransactionWorker.Define("Do a lot of work")
                 .AddStep<FirstTransaction>()
                 .AddStep<SecondTransaction>()
                 .AddStep<Step5>()
                 .Process(tranContext);

As you can see we can mix transactions with steps.

Using your existing code

Because we are using your Dependency Injection module we can use inject on steps different modules to work with:

   public class ArchiveStep : ITransactionStep
       {
           private IZipService _zipService;
           private Stream _stream;
   
           public ArchiveStep(IZipService zipService)
           {
               this._zipService = zipService;
           }
   
           public void Before(dynamic input)
           {
               _stream = input.StreamFile;
           }
   
           public TransactionContext Execute(dynamic input)
           {
               input.ArchivedStream =  _zipService.Archive(_stream);
               
               return input;
           }
       }

Error recovery and Transactional Behaviour:

If an error occurs then all the database modifications will rollback.