add coroutines

src/main/kotlin/drills/drill03/exercise1/Main.kt

@@ -1,12 +1,14 @@
 package drills.drill03.exercise1
 
+import kotlinx.coroutines.cancelAndJoin
+import kotlinx.coroutines.runBlocking
 import util.active.toActive
 import kotlin.time.ExperimentalTime
 import kotlin.time.measureTime
 
 @ExperimentalTime
-fun main() {
-    val math = MathImpl().toActive(Math::class.java)
+fun main() = runBlocking {
+    val (math, job) = MathImpl().toActive(Math::class.java)
 
     val elapsed = measureTime {
         for (i in 0 until 1000)
@@ -14,4 +16,6 @@ fun main() {
     }
 
     println("Elapsed time: $elapsed")
+
+    job.cancelAndJoin()
 }

src/main/kotlin/drills/drill03/exercise3/AddTask.kt

@@ -1,7 +0,0 @@
-package drills.drill03.exercise3
-
-import java.io.Serializable
-
-class AddTask(private val a: Int, private val b: Int) : Task {
-    override fun execute(): Serializable = a + b
-}

src/main/kotlin/drills/drill03/exercise3/Client.kt

@@ -1,26 +0,0 @@
-package drills.drill03.exercise3
-
-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(AddTask(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(FactTask(n))
-    println("The factorial of $n is $fact")
-}
-
-fun fact(n: Int): Long = if (n <= 1) 1 else n * fact(n - 1)

src/main/kotlin/drills/drill03/exercise3/FactTask.kt

@@ -1,9 +0,0 @@
-package drills.drill03.exercise3
-
-import java.io.Serializable
-
-class FactTask(private val n: Int) : Task {
-    override fun execute(): Serializable = fact(n)
-
-    private fun fact(n: Int): Long = if (n <= 1) 1 else n * fact(n - 1)
-}

src/main/kotlin/drills/drill03/exercise3/Rev.kt

@@ -1,15 +0,0 @@
-package drills.drill03.exercise3
-
-import java.io.Serializable
-import java.rmi.Remote
-import java.rmi.RemoteException
-import java.rmi.server.UnicastRemoteObject
-
-interface Rev : Remote {
-    @Throws(RemoteException::class)
-    fun executeTask(task: Task): Serializable
-}
-
-class RevImpl : Rev, UnicastRemoteObject() {
-    override fun executeTask(task: Task): Serializable = task.execute()
-}

src/main/kotlin/drills/drill03/exercise3/Server.kt

@@ -1,11 +0,0 @@
-package drills.drill03.exercise3
-
-import util.rmi.Server
-
-fun main() {
-    Server {
-        System.setSecurityManager(SecurityManager())
-        val rev: Rev = RevImpl()
-        Server.bind(rev, "rev")
-    }.start()
-}

src/main/kotlin/drills/drill03/exercise3/Task.kt

@@ -1,7 +0,0 @@
-package drills.drill03.exercise3
-
-import java.io.Serializable
-
-interface Task : Serializable {
-    fun execute(): Serializable
-}

src/main/kotlin/util/active/ActiveObjectHandler.kt

@@ -1,20 +1,18 @@
 package util.active
 
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.isActive
+import kotlinx.coroutines.launch
 import java.lang.reflect.InvocationHandler
 import java.lang.reflect.Method
 import java.lang.reflect.Proxy
 import java.util.concurrent.LinkedBlockingQueue
+import java.util.concurrent.TimeUnit
 
 class ActiveObjectHandler(private val target: Any) : InvocationHandler {
     private val queue = LinkedBlockingQueue<Call>()
 
-    init {
-        Thread {
-            while (true)
-                queue.take().executeOn(target)
-        }.start()
-    }
-
     override fun invoke(proxy: Any?, method: Method?, args: Array<out Any>?): Any {
         if (method != null && args != null)
             queue.add(Call(method, args))
@@ -22,6 +20,15 @@ class ActiveObjectHandler(private val target: Any) : InvocationHandler {
         return Unit
     }
 
+    fun start(): Job {
+        return GlobalScope.launch {
+            while (isActive || queue.isNotEmpty()) {
+                queue.poll(100, TimeUnit.MILLISECONDS)
+                    ?.executeOn(target) ?: continue
+            }
+        }
+    }
+
     data class Call(val method: Method, val args: Array<out Any>) {
         fun executeOn(target: Any) {
             method.invoke(target, *args)
@@ -29,10 +36,16 @@ class ActiveObjectHandler(private val target: Any) : InvocationHandler {
     }
 }
 
-fun <T> Any.toActive(inter: Class<T>): T {
-    return Proxy.newProxyInstance(
-        this::class.java.classLoader,
-        arrayOf(inter),
-        ActiveObjectHandler(this)
-    ) as T
+fun <T> Any.toActive(inter: Class<T>): Pair<T, Job> {
+    val active = ActiveObjectHandler(this)
+
+    val job = active.start()
+
+    return Pair(
+        Proxy.newProxyInstance(
+            this::class.java.classLoader,
+            arrayOf(inter),
+            active
+        ) as T, job
+    )
 }