Patrón de comando - devuelva un valor

Question

Estoy usando el patrón de comando para pasar un comando de un cliente a un servidor a través de un socket TCP / IP.El servidor tomará el objeto de comando, deserializará y luego llamará a ejecutar () en el objeto de comando.Sin embargo, necesito pasar un valor a la persona que llama sobre el zócalo.¿El patrón de comando permite esto?Si no, ¿hay un trabajo alrededor?He mirado el ejemplo de interruptor de luz en Wikipedia, que es genial, pero no hay valores de retorno. Cualquier consejo enormemente apreciado.

Answer 1

You should not have an "execute()" method on the Command sent to the remote server, this is bad in lots of ways, especially in Java. The Command should represent the action the recipient should take. Which in this case is to call a method on some object.

The Command Pattern is to represent actions taken or to be taken, not the implementation of those actions. Think more of a set of instructions to be carried out.

What your are describing is basically an over-engineer RPC call mechanism. Don't re-invent this wheel. Looks at existing RPC mechanisms, there are plenty to choose from in the Java world. Then you need to decide if the RPC is synchronous or asynchronous.

A REST based API is what is popular and will last longer as an API than any native language specific mechanism like RMI.