Retry Generator

The retry generator creates a strongly typed RetryPolicy<TResult> factory from declarative attributes. It is useful when a team wants retry rules to live beside the operation contract while still producing the same runtime policy as the fluent API.

[GenerateRetryPolicy(
    typeof(InventoryResponse),
    FactoryMethodName = nameof(CreateGeneratedPolicy),
    PolicyName = "inventory-availability",
    MaxAttempts = 3,
    InitialDelayMilliseconds = 25,
    BackoffFactor = 2)]
public static partial class InventoryRetryPolicy
{
    [RetryResultPredicate]
    private static bool ShouldRetry(InventoryResponse response)
        => response.StatusCode == 408 || response.StatusCode == 429 || response.StatusCode >= 500;

    [RetryExceptionPredicate]
    private static bool ShouldRetry(Exception exception)
        => exception is TimeoutException;
}

The generated factory returns PatternKit.Cloud.Retry.RetryPolicy<InventoryResponse> and applies any declared result and exception predicates.

Rules

• The host type must be partial.
• MaxAttempts must be at least 1.
• InitialDelayMilliseconds must be non-negative.
• BackoffFactor must be at least 1.
• Result predicates must be static bool methods with one TResult parameter.
• Exception predicates must be static bool methods with one Exception parameter.

Diagnostics use the PKRET prefix.