How Can I Optimize ServiceStack Request DTO Design for Efficient Service Implementation?

ServiceStack Request DTO Design

Problem:

Designing optimal request DTOs for ServiceStack services can be challenging when migrating from WCF-style RPC services. Issues arise when attempting to reduce duplicate code and efficiently handle multiple request scenarios.

Best Practices:

Message-Based Design:

• Instead of exposing method signatures as RPC calls, encapsulate the entire query within the Request DTO.
• Services should capture all necessary information in the Request DTO, eliminating the need for parameter lists in service methods.
• Leverage the message-based design to combine multiple RPC calls into a single service implementation.

Grouping by Call Semantics and Response Types:

• Organize services based on call semantics (filter vs. combinator) and response types (single item vs. collection).
• Maintain a consistent naming scheme, using verbs for service operations and nouns for DTO types.

Re-factoring Example:

Consider the following example of re-factoring the GetBookingLimit and GetBookingLimits services:

Original:

[Route("/bookinglimit", "GET")]<br>public class GetBookingLimit : IReturn<GetBookingLimitResponse><br>{</p>
<pre class="brush:php;toolbar:false">public int Id { get; set; }

}
public class GetBookingLimitResponse
{

// ...

}

[Route("/bookinglimits", "GET")]
public class GetBookingLimits : IReturn
{

public DateTime Date { get; set; }

}
public class GetBookingLimitsResponse
{

// ...

}

Re-factored:

[Route("/bookinglimits/{Id}")]<br>public class GetBookingLimit : IReturn<BookingLimit><br>{</p>
<pre class="brush:php;toolbar:false">public int Id { get; set; }

}
public class BookingLimit
{

// ...

}

[Route("/bookinglimits/search")]
public class FindBookingLimits : IReturn>
{

public DateTime BookedAfter { get; set; }

}

Additional Considerations:

• Remove ResponseStatus properties from Response DTOs to rely on the generic ErrorResponse DTO for error handling.
• Apply authentication attributes at the service level, rather than on individual Request DTOs.
• Implement validation using Fluent Validation by registering validators with the ServiceStack container.

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