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Mediator.kt
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Mediator.kt
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import org.junit.jupiter.api.Test
class ChatUser(private val mediator: ChatMediator, private val name: String) {
fun send(msg: String) {
println("$name: Sending Message= $msg")
mediator.sendMessage(msg, this)
}
fun receive(msg: String) {
println("$name: Message received: $msg")
}
}
class ChatMediator {
private val users: MutableList<ChatUser> = ArrayList()
fun sendMessage(msg: String, user: ChatUser) {
users
.filter { it != user }
.forEach {
it.receive(msg)
}
}
fun addUser(user: ChatUser): ChatMediator =
apply { users.add(user) }
}
class MediatorTest {
@Test
fun Mediator() {
val mediator = ChatMediator()
val john = ChatUser(mediator, "John")
mediator
.addUser(ChatUser(mediator, "Alice"))
.addUser(ChatUser(mediator, "Bob"))
.addUser(john)
john.send("Hi everyone!")
}
}