Moved Integrationevent to Application folder

Created basic structure for order process saga

src/Services/Ordering/Ordering.API/Application/Commands/CancelOrderCommand.cs

@@ -0,0 +1,21 @@
+using MediatR;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.Serialization;
+using System.Threading.Tasks;
+
+namespace Ordering.API.Application.Commands
+{
+    public class CancelOrderCommand : IAsyncRequest<bool>
+    {
+
+        [DataMember]
+        public int OrderNumber { get; private set; }
+
+        public CancelOrderCommand(int orderNumber)
+        {
+            OrderNumber = orderNumber;
+        }
+    }
+}

src/Services/Ordering/Ordering.API/Application/IntegrationCommands/Commands/ConfirmGracePeriodCommandMsg.cs

@@ -0,0 +1,15 @@
+using Microsoft.eShopOnContainers.BuildingBlocks.EventBus.Events;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Ordering.API.Application.IntegrationCommands.Commands
+{
+    public class ConfirmGracePeriodCommandMsg : IntegrationEvent
+    {
+        public int OrderNumber { get; private set; }
+
+        //TODO: message should change to Integration command type once command bus is implemented 
+    }
+}

src/Services/Ordering/Ordering.API/Application/IntegrationCommands/Commands/SubmitOrderCommandMsg.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.eShopOnContainers.BuildingBlocks.EventBus.Events;
+
+namespace Ordering.API.Application.IntegrationCommands.Commands
+{
+    public class SubmitOrderCommandMsg : IntegrationEvent
+    {
+        public int OrderNumber { get; private set; }
+        //TODO: message should change to Integration command type once command bus is implemented 
+    }
+}

src/Services/Ordering/Ordering.API/Application/IntegrationEvents/Events/OrderStartedIntegrationEvent.cs

@@ -4,7 +4,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 
-namespace Ordering.API.IntegrationEvents.Events
+namespace Ordering.API.Application.IntegrationEvents.Events
 {
     // Integration Events notes: 
     // An Event is “something that has happened in the past”, therefore its name has to be   

src/Services/Ordering/Ordering.API/Application/IntegrationEvents/IOrderingIntegrationEventService.cs

@@ -1,10 +1,7 @@
 using Microsoft.eShopOnContainers.BuildingBlocks.EventBus.Events;
-using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Threading.Tasks;
 
-namespace Ordering.API.IntegrationEvents
+namespace Ordering.API.Application.IntegrationEvents
 {
     public interface IOrderingIntegrationEventService
     {

src/Services/Ordering/Ordering.API/Application/IntegrationEvents/OrderingIntegrationEventService.cs

@@ -1,16 +1,14 @@
 using Microsoft.EntityFrameworkCore;
-using Microsoft.EntityFrameworkCore.Storage;
 using Microsoft.eShopOnContainers.BuildingBlocks.EventBus.Abstractions;
 using Microsoft.eShopOnContainers.BuildingBlocks.EventBus.Events;
 using Microsoft.eShopOnContainers.BuildingBlocks.IntegrationEventLogEF.Services;
 using Microsoft.eShopOnContainers.BuildingBlocks.IntegrationEventLogEF.Utilities;
-using Microsoft.eShopOnContainers.Services.Ordering.Domain.AggregatesModel.OrderAggregate;
 using Microsoft.eShopOnContainers.Services.Ordering.Infrastructure;
 using System;
 using System.Data.Common;
 using System.Threading.Tasks;
 
-namespace Ordering.API.IntegrationEvents
+namespace Ordering.API.Application.IntegrationEvents
 {
     public class OrderingIntegrationEventService : IOrderingIntegrationEventService
     {
@@ -19,7 +17,7 @@ namespace Ordering.API.IntegrationEvents
         private readonly OrderingContext _orderingContext;
         private readonly IIntegrationEventLogService _eventLogService;
 
-        public OrderingIntegrationEventService (IEventBus eventBus, OrderingContext orderingContext,
+        public OrderingIntegrationEventService(IEventBus eventBus, OrderingContext orderingContext,
         Func<DbConnection, IIntegrationEventLogService> integrationEventLogServiceFactory)
         {
             _orderingContext = orderingContext ?? throw new ArgumentNullException(nameof(orderingContext));

src/Services/Ordering/Ordering.API/Application/Sagas/OrderProcessSaga.cs

@@ -0,0 +1,126 @@
+using Autofac.Features.OwnedInstances;
+using MediatR;
+using Microsoft.eShopOnContainers.BuildingBlocks.EventBus.Abstractions;
+using Microsoft.eShopOnContainers.Services.Ordering.API.Application.Commands;
+using Microsoft.eShopOnContainers.Services.Ordering.Domain.AggregatesModel.OrderAggregate;
+using Microsoft.eShopOnContainers.Services.Ordering.Infrastructure;
+using Microsoft.eShopOnContainers.Services.Ordering.Infrastructure.Idempotency;
+using Ordering.API.Application.Commands;
+using Ordering.API.Application.IntegrationCommands.Commands;
+using Ordering.Domain.Exceptions;
+using System;
+using System.Threading.Tasks;
+
+namespace Ordering.API.Application.Sagas
+{
+    /// <summary>
+    /// Saga for handling the place order process
+    /// and which is started once the basket.api has 
+    /// successfully processed the items ordered.
+    /// Saga provides a period of grace to give the customer
+    /// the opportunity to cancel the order before proceeding
+    /// with the validations.
+    /// </summary>
+    public class OrderProcessSaga : Saga<Order>,
+        IIntegrationEventHandler<SubmitOrderCommandMsg>,
+        IIntegrationEventHandler<ConfirmGracePeriodCommandMsg>,
+        IAsyncRequestHandler<CancelOrderCommand, bool>
+    {
+        private readonly IMediator _mediator;
+        private readonly Func<Owned<OrderingContext>> _dbContextFactory;
+
+        public OrderProcessSaga(
+            Func<Owned<OrderingContext>> dbContextFactory, OrderingContext orderingContext,
+            IMediator mediator)
+            : base(orderingContext)
+        {
+            _dbContextFactory = dbContextFactory;
+            _mediator = mediator;
+        }
+
+        /// <summary>
+        /// Command handler which starts the create order process
+        /// and initializes the saga
+        /// </summary>
+        /// <param name="command">
+        /// Integration command message which is sent by the
+        /// basket.api once it has successfully process the 
+        /// order items.
+        /// </param>
+        /// <returns></returns>
+        public async Task Handle(SubmitOrderCommandMsg command)
+        {
+            var orderSaga = FindSagaById(command.OrderNumber);
+            CheckValidSagaId(orderSaga);
+
+            // TODO: This handler should change to Integration command handler type once command bus is implemented
+
+            // TODO: Send createOrder Command
+
+            // TODO: Set saga timeout            
+        }
+
+        /// <summary>
+        /// Command handler which confirms that the grace period
+        /// has been completed and order has not been cancelled.
+        /// If so, the process continues for validation. 
+        /// </summary>
+        /// <param name="command">
+        /// Integration command message which is sent by a saga 
+        /// scheduler which provides the sagas that its grace 
+        /// period has completed.
+        /// </param>
+        /// <returns></returns>
+        public async Task Handle(ConfirmGracePeriodCommandMsg command)
+        {
+            var orderSaga = FindSagaById(command.OrderNumber);
+            CheckValidSagaId(orderSaga);
+
+            // TODO: This handler should change to Integration command handler type once command bus is implemented
+
+            // TODO: If order status is not cancelled, change state to awaitingValidation and 
+            // send ConfirmOrderStockCommandMsg to Inventory api           
+        }
+        
+
+        /// <summary>
+        /// Handler which processes the command when
+        /// customer executes cancel order from app
+        /// </summary>
+        /// <param name="command"></param>
+        /// <returns></returns>
+        public async Task<bool> Handle(CancelOrderCommand command)
+        {
+            var orderSaga = FindSagaById(command.OrderNumber);
+            CheckValidSagaId(orderSaga);
+
+            // Set order status tu cancelled
+
+            return true;
+        }
+
+        private void CheckValidSagaId(Order orderSaga)
+        {
+            if (orderSaga is null)
+            {
+                throw new OrderingDomainException("Not able to process order saga event. Reason: no valid orderId");
+            }
+        }
+
+        #region CommandHandlerIdentifiers
+
+        public class CancelOrderCommandIdentifiedHandler : IdentifierCommandHandler<CancelOrderCommand, bool>
+        {
+            public CancelOrderCommandIdentifiedHandler(IMediator mediator, IRequestManager requestManager) : base(mediator, requestManager)
+            {
+            }
+
+            protected override bool CreateResultForDuplicateRequest()
+            {
+                return true;                // Ignore duplicate requests for processing order.
+            }
+        }
+
+        #endregion
+    }
+}

src/Services/Ordering/Ordering.API/Application/Sagas/Saga.cs

@@ -0,0 +1,30 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.eShopOnContainers.Services.Ordering.Domain.Seedwork;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Ordering.API.Application.Sagas
+{
+    public abstract class Saga<TEntity> where TEntity : Entity
+    {
+        private readonly DbContext _dbContext;
+
+        public Saga(DbContext dbContext)
+        {
+            _dbContext = dbContext;
+        }
+
+        protected TEntity FindSagaById(int id, DbContext context = null)
+        {
+            var ctx = context ?? _dbContext;
+            return ctx.Set<TEntity>().Where(x => x.Id == id).SingleOrDefault();
+        }
+
+        protected async Task<bool> SaveChangesAsync(DbContext context = null)
+        {
+            var ctx = context ?? _dbContext;
+            var result = await ctx.SaveChangesAsync();
+            return result > 0;
+        }
+    }
+}

src/Services/Ordering/Ordering.API/Ordering.API.csproj

@@ -79,8 +79,9 @@
   </ItemGroup>
 
   <ItemGroup>
+    <Folder Include="Application\IntegrationCommands\CommandHandlers\" />
+    <Folder Include="Application\IntegrationEvents\EventHandling\" />
     <Folder Include="Infrastructure\IntegrationEventMigrations\" />
-    <Folder Include="IntegrationEvents\EventHandling\" />
   </ItemGroup>
 
 </Project>