Merge branch 'master' into gossip-girl

1 files changed, 73 insertions, 0 deletions

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..e616c93
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUP.java
@@ -0,0 +1,73 @@
+package pl.edu.mimuw.cloudatlas.agent.modules;
+
+import pl.edu.mimuw.cloudatlas.agent.messages.UDUPMessage;
+
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.SocketException;
+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
+ */
+
+// TODO set server port in global config - must be the same everywhere
+// TODO same with buffer size
+
+public class UDUP extends Module implements Runnable {
+    private UDUPClient client;
+    private UDUPServer server;
+    private final AtomicBoolean running;
+
+    public UDUP(InetAddress serverAddr,
+                int serverPort,
+                int timeout,
+                int bufferSize) {
+        super(ModuleType.UDP);
+        this.running = new AtomicBoolean(false);
+        try {
+            this.client = new UDUPClient(this, serverPort, bufferSize);
+            this.server = new UDUPServer(this, serverAddr, serverPort, bufferSize);
+            this.running.getAndSet(true);
+        } catch (SocketException e) {
+            e.printStackTrace();
+            this.client.close();
+            this.server.close();
+        }
+    }
+
+    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());
+        try {
+            this.client.sendMessage(event);
+        } catch (IOException e) {
+            System.out.println("UDP send message failed");
+            e.printStackTrace();
+        }
+    }
+}