# Simple Azure Table Persistence Usage


## Prerequisites

Ensure that an instance of the latest [Azurite Emulator](https://learn.microsoft.com/en-us/azure/storage/common/storage-use-azurite) or [Azure Cosmos DB Emulator](https://learn.microsoft.com/en-us/azure/cosmos-db/local-emulator) is running.

## Projects

### SharedMessages

* The shared message contracts used by all endpoints.

### Client

* Sends the `StartOrder` message to `Server`.
* Receives and handles the `OrderCompleted` event.

### Server

* Receive the `StartOrder` message and initiate an `OrderSaga`.
* `OrderSaga` requests a timeout with an instance of `CompleteOrder` with the saga data.
* `OrderSaga` publishes an `OrderCompleted` event when the `CompleteOrder` timeout fires.

## Persistence config

Configure the endpoint to use Azure Table Persistence.

<!-- snippet: AzureTableConfig -->

```cs
var useStorageTable = true;
var endpointConfiguration = new EndpointConfiguration("Samples.AzureTable.Simple.Server");

var persistence = endpointConfiguration.UsePersistence<AzureTablePersistence>();

var connection = useStorageTable ? "UseDevelopmentStorage=true" :
    "TableEndpoint=https://localhost:8081/;AccountName=AzureTableSamples;AccountKey=C2y6yDjf5/R+ob0N8A7Cgv30VRDJIWEHLM+4QDU5DE2nQ9nDuVTqobD4b8mGGyPMbIZnqyMsEcaGQy67XIw/Jw==";

var tableServiceClient = new TableServiceClient(connection);
persistence.UseTableServiceClient(tableServiceClient);
```

<!-- endsnippet -->

In the non-transactional mode the saga id is used as a partition key.

## Order saga data

<!-- snippet: sagadata -->

```cs
public class OrderSagaData :
    ContainSagaData
{
    public Guid OrderId { get; set; }
    public string OrderDescription { get; set; }
}
```

<!-- endsnippet -->

## Order saga

<!-- snippet: thesaga -->

```cs
public class OrderSaga(ILogger<OrderSaga> logger) :
    Saga<OrderSagaData>,
    IAmStartedByMessages<StartOrder>,
    IHandleTimeouts<CompleteOrder>
{
    protected override void ConfigureHowToFindSaga(SagaPropertyMapper<OrderSagaData> mapper)
    {
        mapper.MapSaga(saga => saga.OrderId).ToMessage<StartOrder>(msg => msg.OrderId);
    }

    public Task Handle(StartOrder message, IMessageHandlerContext context)
    {
        var orderDescription = $"The saga for order {message.OrderId}";
        Data.OrderDescription = orderDescription;

        logger.LogInformation("Received StartOrder message {OrderId}. Starting Saga", message.OrderId);

        var shipOrder = new ShipOrder
        {
            OrderId = message.OrderId
        };

        logger.LogInformation("Order will complete in 5 seconds");
        var timeoutData = new CompleteOrder
        {
            OrderDescription = orderDescription,
        };

        return Task.WhenAll(
            context.SendLocal(shipOrder),
            RequestTimeout(context, TimeSpan.FromSeconds(5), timeoutData)
        );
    }

    public Task Timeout(CompleteOrder state, IMessageHandlerContext context)
    {
        logger.LogInformation("Saga with OrderId {OrderId} completed", Data.OrderId);
        MarkAsComplete();
        var orderCompleted = new OrderCompleted
        {
            OrderId = Data.OrderId
        };
        return context.Publish(orderCompleted);
    }
}
```

<!-- endsnippet -->