An object for the purpose of sending data to a receiver.

The System.Type returned by message.GetType().

In principle just a function that takes a message as a parameter.

void Handle(RegisterAccountCommand command);

interface IMessageHandler<RegisterAccountCommand>
{
    void Handle(RegisterAccountCommand aMessage);
}

The mechanism by which messages are delivered to handlers.

A component which decouples message senders from message handlers. Instead of client code calling handler methods, clients send and receive messages via the bus. The bus is responsible for routing the messages to the appropriate handler(s) and invoking them.

serviceInstance.RegisterAccount(arguments....

bus.Send(new RegisterAccountCommand(

A message that instructs the handler to perform an action.

class RegisterAccountCommand
{
    AccountId AccountId { get; }
    Password Password { get; }
    Email Email { get; }
}

A message that informs handlers about something that has happened.

interface IAccountRegisteredEvent
{
    AccountId AccountId { get; }
    Password Password { get; }
    Email Email { get; }
}

A message that asks the handler to supply some data.

class RecentlyRegisteredAccountsQuery
{
    TimeSpan MaxAge { get; }
}

A message handler for a command. Must ensure that the command is successfully executed or throw an exception.

A message handler for a query. Must ensure that the query is successfully executed or throw an exception.

A message handler for an event.

Same as Event Handler.

The action of registering an Event Handler with a service bus.

An event handler registered on a service bus.

Asking a service bus to deliver a message to its handler.

Delivering an event to all it’s subscribers.

Same as Publishing an event