Lean PHP Messagebus

A Lean PHP Messagebus (just a demo for my trainings)

CommandBus Design

Middleware

• A Middleware is any class implementing the interface
• A Middleware is invokeable
• A Middleware operates on a message and delegates to the next Middleware

Command

• A command can be any object

CommandBus

• The CommandBus handles a command via its handle method and returns nothing (void)
• The CommandBus is constructed with an array of ordered Middlewares
• The CommandBus ensures all middlewares are called

CommandHandler

• A CommandHandler can be any callable
• The CommandHandler accepts the command

CommandHandlerMiddleware

• The CommandhandlerMiddleware makes the CommandBus
• The CommandHandlerMiddleware delegates a command to its handler
• The CommandHandler uses a HandlerResolver to determine the handler for a given command

HandlerResolver

• A HandlerResolver is any class implementing the interface
• A HandlerResolver determines the command handler for a given command

CommandNameResolver

• A CommandNameResolver is any class implementing the interface
• A CommandName determines the name of a given command