Question

If I have a client defined as follows:-

public interface Client {
    void send(String message);
}

And an implementation as follows:-

final class SocketClient {

    private Integer port;

    @Inject
    SocketClient(Integer port) {
        this.port = port;
    }

    @Override
    public void send(String message) {
        System.out.println("Sending message:- "+message+" to port "+port);
    }
}

How would I use Guice to instantiate multiple instances of the SocketClient, each connecting to different ports?

Answer 1

The first solution that comes to mind is to create a SocketClientFactory interface that looks like

interface SocketClientFactory {
  SocketClient createForPort(int port);
}

and then get factory instances using the assisted injection extension.