// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
// Swagger.
services.AddSwaggerGen(c =>
{
c.SwaggerDoc("v1", new Info {
Title = "AspNetCore Sample", Version = "v1"
});
});
// Repository.
services.AddSingleton <IProductRepository, InMemoryProductRepository>();
// Register command handlers.
SetupContainerRegistration(services);
SetupAttributeRegistration(services);
SetupBasicRegistration(services);
// Command dispatcher.
services.AddSingleton <ICommandAsyncDispatcher>(serviceProvider =>
{
// Wrap ASP NET Core service provider in a resolver.
ICommandHandlerResolver containerResolver = new ContainerCommandAsyncHandlerResolver(new AspNetCoreServiceProviderAdapter(serviceProvider));
// CommandHandlerAttributeRegistration implements ICommandHandlerResolver.
ICommandHandlerResolver attributeResolver = serviceProvider.GetRequiredService <CommandHandlerAttributeRegistration>();
// CommandHandlerRegistration implements ICommandHandlerResolver.
ICommandHandlerResolver basicResolver = serviceProvider.GetRequiredService <CommandHandlerRegistration>();
// Merge all resolvers.
var compositeResolver = new CompositeCommandHandlerResolver(new ICommandHandlerResolver[]
{
// Order is followed when resolving handlers.
containerResolver,
attributeResolver,
basicResolver
}, (ex) => true); // Handle any exception if exception is thrown from a resolver, we can return true to allow the dispatcher to proceed to next resolver.
return(new CommandDispatcher(compositeResolver));
});
services.AddMvc();
}
public async Task Should_Invoke_Registered_Command_Handler_With_Composite_Resolver()
{
var commandHandler = new TestCommandHandler(_outputHelper);
var container = new Container();
container.Register <ICommandHandler <DoSomethingCommand> >(() => commandHandler, Lifestyle.Singleton);
container.Register <ICommandAsyncHandler <DoSomethingWithCancellationCommand> >(() => commandHandler, Lifestyle.Singleton);
var containerAdapter = new SimpleInjectorContainerAdapter(container);
var containerAsyncHandlerResolver = new ContainerCommandAsyncHandlerResolver(containerAdapter);
var containerHandlerResolver = new ContainerCommandHandlerResolver(containerAdapter);
Func <Exception, bool> exceptionHandler = (ex) =>
{
var exception = ex as NoCommandHandlerResolvedException;
if (exception != null)
{
_outputHelper.WriteLine($"Ignoring encountered exception while trying to resolve command handler for {exception.CommandType.Name}...");
// Notify as handled if no command handler is resolved from other resolvers.
return(true);
}
return(false);
};
var compositeResolver = new CompositeCommandHandlerResolver(new List <ICommandHandlerResolver>()
{
containerAsyncHandlerResolver,
containerHandlerResolver
}, exceptionHandler); // Pass in an exception handler.
var dispatcher = new CommandDispatcher(compositeResolver); // Composite resolver
await dispatcher.DispatchAsync(new DoSomethingCommand());
await dispatcher.DispatchAsync(new DoSomethingWithCancellationCommand());
Assert.Equal(2, commandHandler.HandledCommands.Count);
Assert.Contains(commandHandler.HandledCommands, c => c is DoSomethingCommand);
Assert.Contains(commandHandler.HandledCommands, c => c is DoSomethingWithCancellationCommand);
}
