From 1d99762c7965d351510cfb5e08eac25e48d96038 Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Fri, 6 Jun 2025 08:02:52 +0300
Subject: Modernize project structure, update Maven config, move sources, add
 logging config, update README and .gitignore

---
 .../VSReliableMulticastProtocol.java               | 143 +++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 src/main/java/protocols/implementations/VSReliableMulticastProtocol.java

(limited to 'src/main/java/protocols/implementations/VSReliableMulticastProtocol.java')

diff --git a/src/main/java/protocols/implementations/VSReliableMulticastProtocol.java b/src/main/java/protocols/implementations/VSReliableMulticastProtocol.java
new file mode 100644
index 0000000..170533a
--- /dev/null
+++ b/src/main/java/protocols/implementations/VSReliableMulticastProtocol.java
@@ -0,0 +1,143 @@
+package protocols.implementations;
+
+import java.util.ArrayList;
+import java.util.Vector;
+
+import core.VSMessage;
+import protocols.VSAbstractProtocol;
+
+/**
+ * The class VSReliableMulticastProtocol, an implementation of the reliable
+ * multicast protocol.
+ *
+ * @author Paul C. Buetow
+ */
+public class VSReliableMulticastProtocol extends VSAbstractProtocol {
+    /**
+     * Instantiates a two phase commit protocol object.
+     */
+    public VSReliableMulticastProtocol() {
+        super(VSAbstractProtocol.HAS_ON_CLIENT_START);
+        setClassname(getClass().toString());
+    }
+
+    /** PIDs of all processes which still have to send an ACK */
+    private ArrayList<Integer> pids;
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onClientInit()
+     */
+    public void onClientInit() {
+        Vector<Integer> vec = new Vector<Integer>();
+        vec.add(1);
+        vec.add(3);
+
+        super.initVector("pids", vec, "PIDs beteiligter Prozesse");
+        super.initLong("timeout", 2500, "Zeit bis erneute Anfrage", "ms");
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientReset()
+     */
+    public void onClientReset() {
+        if (pids != null) {
+            pids.clear();
+            pids.addAll(getVector("pids"));
+        }
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientStart()
+     */
+    public void onClientStart() {
+        if (pids == null) {
+            pids = new ArrayList<Integer>();
+            pids.addAll(getVector("pids"));
+        }
+
+        if (pids.size() != 0) {
+            long timeout = getLong("timeout") + process.getTime();
+            /* Will run onClientSchedule() at the specified local time */
+            scheduleAt(timeout);
+
+            VSMessage message = new VSMessage();
+            message.setBoolean("isMulticast", true);
+            sendMessage(message);
+        }
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientRecv(core.VSMessage)
+     */
+    public void onClientRecv(VSMessage recvMessage) {
+        if (pids.size() != 0 && recvMessage.getBoolean("isAck")) {
+            Integer pid = recvMessage.getIntegerObj("pid");
+
+            if (pids.contains(pid))
+                pids.remove(pid);
+            else
+                return;
+
+            log("ACK from process " + pid + " received!");
+
+
+            if (pids.size() == 0) {
+                log("ACKs from all involved processes received!");
+
+                /* Remove the active schedule which has been created in the
+                   onClientStart method */
+                removeSchedules();
+            }
+        }
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientSchedule()
+     */
+    public void onClientSchedule() {
+        onClientStart();
+    }
+
+    /** True if ACK has been sent already */
+    private boolean ackSent;
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onServerInit()
+     */
+    public void onServerInit() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerReset()
+     */
+    public void onServerReset() {
+        ackSent = false;
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerRecv(core.VSMessage)
+     */
+    public void onServerRecv(VSMessage recvMessage) {
+        if (recvMessage.getBoolean("isMulticast")) {
+            VSMessage message = new VSMessage();
+            message.setBoolean("isAck", true);
+            message.setInteger("pid", process.getProcessID());
+            sendMessage(message);
+
+            if (ackSent) {
+                log("ACK sent again");
+
+            } else {
+                log("ACK sent");
+
+                ackSent = true;
+            }
+        }
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerSchedule()
+     */
+    public void onServerSchedule() {
+    }
+}
-- 
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