About UnicastRemoteObject
Our class must extend UnicastRemoteObject,
and implement our interface Chat.
- UnicastRemoteObject provides us with an implementation of method exportObject, which makes our object available to receive remote calls.
- exportObject is static, so you can use it to export objects if you do not want your server to extend UnicastRemoteObject.
- It comes with a default constructor, but we can use other constructors to specify a port and possibly a RMIClientSocketFactory and RMIServerSocketFactory.
- We use these factories to create our own, custom sockets. But why would we want to do that? Actually, it's fairly common. You can make a custom socket class if you want to implement a particular security or encryption mechanism, such as Triple DES.
- UnicastRemoteObject is made to run with TCP connections.