public DefaultFunctionContext(IServiceScopeFactory serviceScopeFactory, IInvocationFeatures features)
{
_serviceScopeFactory = serviceScopeFactory ?? throw new ArgumentNullException(nameof(serviceScopeFactory));
Features = features ?? throw new ArgumentNullException(nameof(features));
_invocation = features.Get <FunctionInvocation>() ?? throw new InvalidOperationException($"The '{nameof(FunctionInvocation)}' feature is required.");
FunctionDefinition = features.Get <FunctionDefinition>() ?? throw new InvalidOperationException($"The {nameof(Worker.FunctionDefinition)} feature is required.");
}
public FunctionContext CreateContext(IInvocationFeatures features)
{
var invocation = features.Get <FunctionInvocation>() ?? throw new InvalidOperationException($"The {nameof(FunctionInvocation)} feature is required.");
var functionDefinition = _functionMap[invocation.FunctionId];
features.Set <FunctionDefinition>(functionDefinition);
return(_functionContextFactory.Create(features));
}
/// <summary>
/// Gets a feature of type <typeparamref name="T"/> from the <see cref="IInvocationFeatures"/>.
/// </summary>
/// <typeparam name="T">The type of the feature to get.</typeparam>
/// <param name="features">The <see cref="IInvocationFeatures"/>.</param>
/// <returns>A feature object of type <typeparamref name="T"/>.</returns>
/// <exception cref="InvalidOperationException">There is no feature of type <typeparamref name="T"/>.</exception>
public static T GetRequired <T>(this IInvocationFeatures features)
{
var feature = features.Get <T>();
if (feature is null)
{
throw new InvalidOperationException($"No feature is registered with the type {typeof(T)}.");
}
return(feature);
}
/// <summary>
/// Tries to get a feature of type <typeparamref name="T"/> from the <see cref="IInvocationFeatures"/>.
/// </summary>
/// <typeparam name="T">The type of the feature to get.</typeparam>
/// <param name="features">The <see cref="IInvocationFeatures"/>.</param>
/// <param name="feature">The feature, if found. Otherwise, null.</param>
/// <returns>True if the feature was found. Otherwise, false.</returns>
public static bool TryGet <T>(this IInvocationFeatures features, out T?feature)
{
feature = features.Get <T>();
return(feature is not null);
}