public static IQueryHandler <TQuery, TResponse> Default <TQuery, TResponse>(object handler, IServiceProvider provider) where TQuery : IQuery <TResponse>
{
var logger = provider.GetService <ILogger>();
var validations = provider.GetServices <IValidator <TQuery> >();
var loggingDecorator = new LoggingQueryDecorator <TQuery, TResponse>((IQueryHandler <TQuery, TResponse>)handler, logger);
var validationDecorator = new ValidationQueryDecorator <TQuery, TResponse>(loggingDecorator, validations);
var retryDecorator = new RetryQueryDecorator <TQuery, TResponse>(validationDecorator, logger);
return(retryDecorator); // order is revers for decorators
}
public void Test_ReturnsCorrectValueOnNoErrors()
{
// Arrange
int expected = 5;
var queryMock = new Mock <IQuery <int, int> >();
queryMock.SetupSequence(x => x.Execute(It.IsAny <int>()))
.Returns(expected);
var sut = new RetryQueryDecorator <int, int>(queryMock.Object);
// Act
var actual = sut.Execute(0);
// Assert
Assert.Equal(expected, actual);
queryMock.Verify(x => x.Execute(It.IsAny <int>()), Times.Exactly(1));
}
public void Test_ThrowsAfterRetriesOnErrors()
{
// Arrange
var queryMock = new Mock <IQuery <int, int> >();
queryMock.SetupSequence(x => x.Execute(It.IsAny <int>()))
.Throws(new ArgumentException())
.Throws(new ArgumentException())
.Throws(new ArgumentException())
.Throws(new ArgumentException())
.Throws(new ArgumentException())
.Throws(new ArgumentException());
var sut = new RetryQueryDecorator <int, int>(queryMock.Object);
// Act
Assert.Throws <ArgumentException>(() => sut.Execute(0));
queryMock.Verify(x => x.Execute(It.IsAny <int>()), Times.Exactly(5));
}
