add drill02 ex 1 & 2

This commit is contained in:
Raffaele Mignone 2020-03-21 22:24:48 +01:00
parent a6ae9aa30f
commit ac35528eab
Signed by: norangebit
GPG Key ID: F5255658CB220573
8 changed files with 137 additions and 2 deletions

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@ -0,0 +1,25 @@
package drills.drill02.exercise1
import util.rmi.Client
fun main() {
Client(clientHandler).start()
}
val clientHandler = {
val chat = Client.lookup("chat") as RemoteObservable
val observer: RemoteObserver = ChatObserver()
chat.attach(observer)
print("Send> ")
var line = readLine() ?: "."
while (line != ".") {
chat.notify(line)
println("Send> ")
line = readLine() ?: "."
}
chat.detach(observer)
}

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@ -0,0 +1,34 @@
package drills.drill02.exercise1
import java.rmi.Remote
import java.rmi.RemoteException
import java.rmi.server.UnicastRemoteObject
interface RemoteObservable : Remote {
@Throws(RemoteException::class)
fun attach(o: RemoteObserver)
@Throws(RemoteException::class)
fun detach(o: RemoteObserver)
@Throws(RemoteException::class)
fun notify(obj: Any)
}
abstract class AbstractRemoteObservable : RemoteObservable, UnicastRemoteObject() {
private val observers = mutableListOf<RemoteObserver>()
override fun attach(o: RemoteObserver) {
observers.add(o)
}
override fun detach(o: RemoteObserver) {
observers.remove(o)
}
override fun notify(obj: Any) {
observers.forEach {
it.update(obj)
}
}
}

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@ -0,0 +1,16 @@
package drills.drill02.exercise1
import java.rmi.Remote
import java.rmi.RemoteException
import java.rmi.server.UnicastRemoteObject
interface RemoteObserver : Remote {
@Throws(RemoteException::class)
fun update(obj: Any)
}
class ChatObserver : RemoteObserver, UnicastRemoteObject() {
override fun update(obj: Any) {
println("Received> ${obj as String}")
}
}

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@ -0,0 +1,10 @@
package drills.drill02.exercise1
import util.rmi.Server
fun main() {
Server {
val chat = object : AbstractRemoteObservable() {}
Server.bind(chat, "chat")
}.start()
}

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@ -0,0 +1,26 @@
package drills.drill02.exercise2
import util.rmi.Client
fun main() {
Client(clientHandler).start()
}
val clientHandler = {
val rev = Client.lookup("rev") as Rev
println("Enter two numbers:")
val a = readLine()?.toInt() ?: 0
val b = readLine()?.toInt() ?: 0
val sum = rev.executeTask { a + b }
println("The sum of $a and $b is $sum")
println("Enter the number of which you want to calculate the factorial:")
val n = readLine()?.toInt() ?: 0
val fact = rev.executeTask { fact(n) }
println("The factorial of $n is $fact")
}
fun fact(n: Int): Long = if (n <= 1) 1 else n * fact(n - 1)

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package drills.drill02.exercise2
import java.rmi.Remote
import java.rmi.RemoteException
import java.rmi.server.UnicastRemoteObject
interface Rev : Remote {
@Throws(RemoteException::class)
fun <T> executeTask(task: () -> T): T
}
class RevImpl : Rev, UnicastRemoteObject() {
override fun <T> executeTask(task: () -> T): T = task()
}

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@ -0,0 +1,10 @@
package drills.drill02.exercise2
import util.rmi.Server
fun main() {
Server {
val rev: Rev = RevImpl()
Server.bind(rev, "rev")
}.start()
}

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@ -25,9 +25,9 @@ class Server(private val handler: () -> Unit) {
} }
companion object { companion object {
fun bind(remote: Remote, name: String, port: Int = 4242) { fun bind(remote: Remote, name: String, host: String = "localhost", port: Int = 4242) {
LocateRegistry.createRegistry(port) LocateRegistry.createRegistry(port)
Naming.bind("rmi://localhost:$port/$name", remote) Naming.bind("rmi://$host:$port/$name", remote)
} }
} }
} }