// Composition root
private IServiceProvider BuildServiceProvider(Options options, IConfigurationSection queueConfig)
{
var services = new ServiceCollection().AddLogging();
services.AddSingleton<IMessageHandlerFactory, MessageHandlerFactory>();
switch (options.QueueType)
{
case "zeromq":
services.AddZeroMq(queueConfig);
break;
case "msmq":
services.AddMsmq(queueConfig);
break;
case "azure":
services.AddAzure(queueConfig);
break;
default:
throw new Exception($"Could not resolve queue type {options.QueueType}");
}
if (!string.IsNullOrWhiteSpace(options.Handler))
{
services.AddTransient(typeof(IMessageHandler), Type.GetType(options.Handler));
}
var provider = services.BuildServiceProvider();
// configure
var loggerFactory = provider.GetRequiredService<ILoggerFactory>();
loggerFactory.MinimumLevel = LogLevel.Debug;
loggerFactory.AddConsole(loggerFactory.MinimumLevel);
return provider;
}
public void Main(string[] args)
{
var runtimeConfig = new ConfigurationBuilder()
.AddCommandLine(args)
.Build();
var options = new Options();
runtimeConfig.Bind(options);
var queueConfig = new ConfigurationBuilder(".")
.AddJsonFile("queues.json")
.Build()
.GetSection(options.QueueType);
var services = BuildServiceProvider(options, queueConfig);
var logger = services.GetRequiredService<ILogger<Program>>();
var handlerFactory = services.GetRequiredService<IMessageHandlerFactory>();
var queueFactory = services.GetRequiredService<IMessageQueueFactory>();
var queue = queueFactory.Get(options.ListenTo);
queue.Listen(msg =>
{
var handler = handlerFactory.GetHandler(msg.Body.GetType());
handler.Handle(msg, queue);
});
}