From c077d789e25a88d8be8f8082c321d7aadb83cd96 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Magdalena=20Grodzi=C5=84ska?= <mag.grodzinska@gmail.com>
Date: Wed, 15 Jan 2020 03:24:48 +0100
Subject: Add cleaning to UDUP

---
 .../pl/edu/mimuw/cloudatlas/agent/AgentConfig.java |  2 +-
 .../mimuw/cloudatlas/agent/modules/UDUPServer.java | 30 +++++++++++++++++++---
 2 files changed, 27 insertions(+), 5 deletions(-)

diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/agent/AgentConfig.java b/src/main/java/pl/edu/mimuw/cloudatlas/agent/AgentConfig.java
index 2363f4b..ad0f3bd 100644
--- a/src/main/java/pl/edu/mimuw/cloudatlas/agent/AgentConfig.java
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/agent/AgentConfig.java
@@ -52,7 +52,7 @@ public class AgentConfig {
         modules.put(ModuleType.QUERY, new Qurnik());
         modules.put(ModuleType.GOSSIP, new GossipGirl());
 
-        UDUPServer server = new UDUPServer(serverAddr, port, bufsize);
+        UDUPServer server = new UDUPServer(serverAddr, port, bufsize, freshnessPeriod);
         modules.put(ModuleType.UDP, new UDUP(port, timeout, bufsize, server));
         return modules;
     }
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUPServer.java b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUPServer.java
index dae0420..677bf67 100644
--- a/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUPServer.java
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUPServer.java
@@ -9,9 +9,7 @@ import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.net.*;
 import java.nio.ByteBuffer;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.NoSuchElementException;
+import java.util.*;
 import java.util.concurrent.atomic.AtomicBoolean;
 
 public class UDUPServer implements Runnable {
@@ -20,25 +18,45 @@ public class UDUPServer implements Runnable {
     private DatagramSocket socket;
     private InetAddress address;
     private HashMap<String, ArrayList<byte[]>> partialPackets;
+    private HashMap<String, Long> partialPacketTimestamps;
     private int bufSize;
     private final AtomicBoolean running;
+    private long freshnessPeriod;
 
-    public UDUPServer(InetAddress addr, int port, int bufSize) throws SocketException {
+    public UDUPServer(InetAddress addr, int port, int bufSize, long freshnessPeriod) throws SocketException {
         this.socket = new DatagramSocket(port);
         this.address = addr;
         this.bufSize = bufSize;
         this.partialPackets = new HashMap<>();
         this.serializer = new ByteSerializer();
         this.running = new AtomicBoolean(false);
+        this.freshnessPeriod = freshnessPeriod;
+        this.partialPacketTimestamps = new HashMap<>();
     }
 
     public void setUDUP(UDUP udup) {
         this.udp = udup;
     }
 
+    private void purgeData() {
+        long currentTime = System.currentTimeMillis();
+        ArrayList<String> packetsToRemove = new ArrayList<>();
+        for (Map.Entry<String, Long> packetTimestamp : partialPacketTimestamps.entrySet()) {
+            if (packetTimestamp.getValue() + freshnessPeriod < currentTime) {
+                packetsToRemove.add(packetTimestamp.getKey());
+            }
+        }
+
+        for (String packetToRemove : packetsToRemove) {
+            partialPacketTimestamps.remove(packetToRemove);
+            partialPackets.remove(packetToRemove);
+        }
+    }
+
     public void run() {
         System.out.println("UDP server running");
         this.running.getAndSet(true);
+
         while(this.running.get()) {
             try {
                 this.acceptMessage();
@@ -71,6 +89,8 @@ public class UDUPServer implements Runnable {
             msg.getContent().setSenderAddress(packet.getAddress());
             sendMessageFurther(msg);
         }
+
+        purgeData();
     }
 
     private DatagramPacket receivePacket() throws IOException {
@@ -120,6 +140,7 @@ public class UDUPServer implements Runnable {
 
         previousPacketData.add(newPacketNo - 1, newPacketData);
         this.partialPackets.put(transmissionID, previousPacketData);
+        this.partialPacketTimestamps.put(transmissionID, System.currentTimeMillis());
 
         if (previousPacketData.contains(null)) {
             throw new NoSuchElementException("Packet is not full");
@@ -135,6 +156,7 @@ public class UDUPServer implements Runnable {
     public UDUPMessage addPartialMessageAndCheckSerialization(String transmissionID, int newPacketNo, byte[] packetData) {
         UDUPMessage msg = null;
 
+        this.partialPacketTimestamps.put(transmissionID, System.currentTimeMillis());
         if (this.partialPackets.containsKey(transmissionID)) {
             try {
                 byte[] allPacketData = concatPacketData(transmissionID, newPacketNo, packetData);
-- 
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