From bfd4c421004ce35a9eac307c3ac4976caa1820ae Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Magdalena=20Grodzi=C5=84ska?= <mag.grodzinska@gmail.com>
Date: Sun, 5 Jan 2020 18:00:56 +0100
Subject: UDUP with no serialization working

---
 .../edu/mimuw/cloudatlas/agent/modules/UDUP.java   | 120 +++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUP.java

(limited to 'src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUP.java')

diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUP.java b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUP.java
new file mode 100644
index 0000000..e4a7962
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUP.java
@@ -0,0 +1,120 @@
+package pl.edu.mimuw.cloudatlas.agent.modules;
+
+import com.esotericsoftware.kryo.Kryo;
+import com.esotericsoftware.kryo.io.Input;
+import com.esotericsoftware.kryo.io.Output;
+import com.google.common.primitives.Bytes;
+import pl.edu.mimuw.cloudatlas.agent.EventBus;
+import pl.edu.mimuw.cloudatlas.agent.messages.UDUPMessage;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.SocketException;
+import java.net.UnknownHostException;
+import java.util.HashMap;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/**
+ * Communication over UDP
+ *
+ * Client-server exchange pattern:
+ *  server: init message
+ *  client: ack message
+ *
+ *  retry count
+ *  retry timeout after which retry happens
+ **
+ *  udp sends initiator module success/failure information
+ *
+ *  we have udps on different addresses with the same ports
+ *  due to ValueContact design
+ */
+
+public class UDUP extends Module implements Runnable {
+    public class InvalidConversation extends Exception {
+        public InvalidConversation(String message) { super(message); }
+    }
+
+    public class InvalidContact extends Exception {
+        public InvalidContact(String message) { super(message); }
+    }
+
+    private UDUPClient client;
+    private UDUPServer server;
+    private HashMap<String, UDUPMessage> currentConversations; // TODO find blocking one
+    private final AtomicBoolean running;
+
+    public UDUP(ModuleType moduleType,
+                InetAddress serverAddr,
+                int serverPort,
+                int retryTimeout,
+                int retriesCount,
+                int bufferSize) {
+        super(moduleType);
+        this.currentConversations = new HashMap<>();
+        this.running = new AtomicBoolean(true);
+        try {
+            this.client = new UDUPClient(this, serverPort, retryTimeout, retriesCount, bufferSize);
+            this.server = new UDUPServer(this, serverAddr, serverPort, bufferSize);
+        } catch (SocketException | UnknownHostException e) {
+            e.printStackTrace();
+            this.client.close();
+            this.server.close();
+            this.running.getAndSet(false);
+        }
+    }
+
+    public void run() {
+        System.out.println("UDP server running");
+        while(this.running.get()) {
+            try {
+                this.server.acceptMessage();
+            } catch (IOException | InterruptedException e) {
+                e.printStackTrace();
+                this.running.getAndSet(false);
+                this.server.close();
+            }
+        }
+    }
+
+    public void handleTyped(UDUPMessage event) throws InterruptedException {
+//        System.out.println("UDP sending message " + event.getContent().getMessageId());
+        this.client.sendMessage(event);
+    }
+
+    // also used for updating
+    public void addConversation(UDUPMessage msg) {
+        this.currentConversations.put(msg.getConversationId(), msg);
+    }
+
+    public UDUPMessage fetchConversation(String conversationId) throws InvalidConversation {
+        UDUPMessage ret = this.currentConversations.get(conversationId);
+        if (ret == null) {
+            throw new InvalidConversation("Conversation does not exist");
+        } else {
+            return ret;
+        }
+    }
+
+    // TODO add conversation removal
+    public void removeConversation(String conversationId) {
+        this.currentConversations.remove(conversationId);
+    }
+
+    public UDUPMessage deserialize(ByteArrayInputStream in) {
+        Kryo kryo = new Kryo();
+        Input kryoInput = new Input(in);
+        UDUPMessage msg = kryo.readObject(kryoInput, UDUPMessage.class);
+        return msg;
+    }
+
+    public void serialize(ByteArrayOutputStream out, UDUPMessage msg) {
+        Kryo kryo = new Kryo();
+        Output kryoOut = new Output(out);
+        kryo.writeObject(kryoOut, msg);
+        kryoOut.flush();
+    }
+
+}
-- 
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