add gossip

src/main/kotlin/drills/drill09/dbreplica/TestPull.kt

@@ -22,7 +22,7 @@ fun main() {
         println((it as DbNode<Int>).nodeValue)
     }
 
-    alpha.changeValue(TimedPayload(42, System.nanoTime()))
+    alpha.changeValue(TimedPayload.createContent(42))
     Thread.sleep(2000)
 
     network.forEach {

src/main/kotlin/drills/drill09/dbreplica/TestPush.kt

@@ -22,7 +22,7 @@ fun main() {
         println((it as DbNode<Int>).nodeValue)
     }
 
-    alpha.changeValue(TimedPayload(42, System.nanoTime()))
+    alpha.changeValue(TimedPayload.createContent(42))
     Thread.sleep(2000)
 
     network.forEach {

src/main/kotlin/drills/drill09/dbreplica/TestPushPull.kt

@@ -22,7 +22,7 @@ fun main() {
         println((it as DbNode<Int>).nodeValue)
     }
 
-    alpha.changeValue(TimedPayload(42, System.nanoTime()))
+    alpha.changeValue(TimedPayload.createContent(42))
     Thread.sleep(2000)
 
     network.forEach {

src/main/kotlin/drills/drill09/gossip/QueryNode.kt

@@ -0,0 +1,74 @@
+package drills.drill09.gossip
+
+import util.network.epidemic.EpidemicNode
+import util.network.epidemic.packet.EpidemicPacket
+import util.network.epidemic.packet.FeedbackEpidemicPacket
+import util.network.simulator.Address
+import util.network.simulator.Network
+import kotlin.random.Random
+
+class QueryNode<T>(
+    address: Address,
+    network: Network,
+    initialValue: T,
+    bufferSize: Int = 1
+) : EpidemicNode<T, FeedbackEpidemicPacket<T>>(
+    address, network, initialValue, bufferSize
+) {
+    private var queryValue: T = nodeValue
+    private var random = Random(System.currentTimeMillis())
+
+    override fun makeInfectionPacket(
+        receiverAddress: Address,
+        type: EpidemicPacket.Type
+    ): EpidemicPacket<T> {
+        return FeedbackEpidemicPacket(
+            address,
+            receiverAddress,
+            queryValue,
+            type,
+            false
+        )
+    }
+
+    override fun receivePushOrReply(packet: FeedbackEpidemicPacket<T>) {
+        //println(packet)
+        if (nodeState == State.REMOVED)
+            return
+
+        if (nodeState == State.SUSCEPTIBLE) {
+           // println("susceptible")
+            nodeState = State.INFECTED
+
+            queryValue = packet.payload
+            sendPush(1)
+
+            if (packet.payload == nodeValue)
+                println("find on node $address")
+        } else {
+            if (packet.isFeedback && random.nextBoolean()) {
+                nodeState = State.REMOVED
+                println("removed")
+
+            }
+
+            send(
+                FeedbackEpidemicPacket(
+                    address,
+                    packet.senderAddress,
+                    queryValue,
+                    EpidemicPacket.Type.PUSH,
+                    true
+                )
+            )
+        }
+    }
+
+    override fun receivePull(packet: FeedbackEpidemicPacket<T>) {
+        TODO("Not yet implemented")
+    }
+
+    override fun infect() {
+        Thread.interrupted()
+    }
+}

src/main/kotlin/drills/drill09/gossip/TestPush.kt

@@ -0,0 +1,31 @@
+package drills.drill09.gossip
+
+import util.network.epidemic.packet.EpidemicPacket
+import util.network.epidemic.packet.FeedbackEpidemicPacket
+import util.network.simulator.Address
+import util.network.simulator.Network
+
+
+fun main() {
+    val network = Network()
+
+    repeat(10) {
+        QueryNode(Address(it), network, it*2)
+    }
+
+    val alpha = network.getRandomNode() as QueryNode<Int>
+    val beta = network.getRandomNode() as QueryNode<Int>
+
+    val packet = FeedbackEpidemicPacket(
+        alpha.address,
+        beta.address,
+        14,
+        EpidemicPacket.Type.PUSH,
+        false
+    )
+
+    alpha.send(packet)
+
+    network.start()
+}
+

src/main/kotlin/util/network/epidemic/EpidemicNode.kt

@@ -14,7 +14,7 @@ abstract class EpidemicNode<T, P: EpidemicPacket<T>>(
     @Volatile
     var nodeValue = initialValue
         private set
-    private var nodeState = State.SUSCETIBLE
+    protected var nodeState = State.SUSCEPTIBLE
 
     @Synchronized
     fun changeValue(value: T) {
@@ -68,28 +68,7 @@ abstract class EpidemicNode<T, P: EpidemicPacket<T>>(
 
     protected abstract fun infect()
 
-    override fun communicatorFactory(threadGroup: ThreadGroup): CommunicatorFactory {
-        return EpidemicCommunicatorFactory(threadGroup)
-    }
-
-    private enum class State {
-        SUSCETIBLE, INFECTED, REMOVED
-    }
-
-    enum class InfectStrategy {
-        PUSH, PULL, PUSHPULL
-    }
-
-    protected inner class EpidemicReceiver(
-        threadGroup: ThreadGroup
-    ) : Node.Receiver(threadGroup) {
-        override fun run() {
-            while (!isInterrupted)
-                onReceive()
-        }
-
-        private fun onReceive() {
-            val packet = receive() as P
+    protected fun onReceive(packet: P) {
         //println(packet.type)
 
         when (packet.type) {
@@ -102,6 +81,28 @@ abstract class EpidemicNode<T, P: EpidemicPacket<T>>(
             }
         }
     }
+
+    override fun communicatorFactory(threadGroup: ThreadGroup): CommunicatorFactory {
+        return EpidemicCommunicatorFactory(threadGroup)
+    }
+
+    protected enum class State {
+        SUSCEPTIBLE, INFECTED, REMOVED
+    }
+
+    enum class InfectStrategy {
+        PUSH, PULL, PUSHPULL
+    }
+
+    protected inner class EpidemicReceiver(
+        threadGroup: ThreadGroup
+    ) : Node.Receiver(threadGroup) {
+        override fun run() {
+            while (!isInterrupted) {
+                val packet = receive() as P
+                onReceive(packet)
+            }
+        }
     }
 
     protected inner class EpidemicSender(