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diff --git a/VS-Sim-Sources/sources/protocols/implementations/VSOnePhaseCommitProtocol.java b/VS-Sim-Sources/sources/protocols/implementations/VSOnePhaseCommitProtocol.java
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+/*
+ * Copyright (c) 2008 Paul C. Buetow, vs@dev.buetow.org
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * All icons of the icons/ folder are 	under a Creative Commons
+ * Attribution-Noncommercial-Share Alike License a CC-by-nc-sa.
+ *
+ * The icon's homepage is http://code.google.com/p/ultimate-gnome/
+ */
+
+package protocols.implementations;
+
+import java.util.ArrayList;
+import java.util.Vector;
+
+import protocols.VSAbstractProtocol;
+import core.VSMessage;
+
+/**
+ * The class VSOnePhaseCommitProtocol, an implementation of the one phase
+ * commit protocol.
+ *
+ * @author Paul C. Buetow
+ */
+public class VSOnePhaseCommitProtocol extends VSAbstractProtocol {
+    /** The serial version uid */
+    private static final long serialVersionUID = 1L;
+
+    /* Server variables */
+    private boolean ackSent;
+
+    /**
+     * Instantiates a one phase commit protocol.
+     */
+    public VSOnePhaseCommitProtocol() {
+        super(VSAbstractProtocol.HAS_ON_SERVER_START);
+        setClassname(getClass().toString());
+    }
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onServerInit()
+     */
+    public void onServerInit() {
+        /* Can be changed via GUI variables editor of each process */
+        Vector<Integer> vec = new Vector<Integer>();
+        vec.add(1);
+        vec.add(3);
+
+        initVector("pids", vec, "PIDs beteiligter Prozesse");
+        initLong("timeout", 2500, "Zeit bis erneute Anfrage", "ms");
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerReset()
+     */
+    public void onServerReset() {
+        if (pids != null) {
+            pids.clear();
+            pids.addAll(getVector("pids"));
+        }
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerStart()
+     */
+    public void onServerStart() {
+        if (pids == null) {
+            pids = new ArrayList<Integer>();
+            pids.addAll(getVector("pids"));
+        }
+
+        if (pids.size() != 0) {
+            long timeout = getLong("timeout") + process.getTime();
+            /* Will run onServerSchedule() at the specified local time */
+            scheduleAt(timeout);
+
+            VSMessage message = new VSMessage();
+            message.setBoolean("wantAck", true);
+            sendMessage(message);
+        }
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerRecv(core.VSMessage)
+     */
+    public void onServerRecv(VSMessage recvMessage) {
+        if (pids.size() == 0)
+            return;
+
+        if (recvMessage.getBoolean("isAck")) {
+            Integer pid = recvMessage.getIntegerObj("pid");
+            if (pids.contains(pid))
+                pids.remove(pid);
+            else
+                return;
+
+            log("ACK von Prozess " + pid + " erhalten!");
+
+            if (pids.size() == 0) {
+                log("ACKs von allen beteiligten Prozessen erhalten! " +
+                    "Festgeschrieben!");
+
+                /* Remove the active schedule which has been created in the
+                   onServerStart method */
+                removeSchedules();
+            }
+        }
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerSchedule()
+     */
+    public void onServerSchedule() {
+        onServerStart();
+    }
+
+
+    /* Client variables, coordinator */
+    private ArrayList<Integer> pids;
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onClientInit()
+     */
+    public void onClientInit() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientReset()
+     */
+    public void onClientReset() {
+        ackSent = false;
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientRecv(core.VSMessage)
+     */
+    public void onClientRecv(VSMessage recvMessage) {
+        if (ackSent)
+            return;
+
+        VSMessage message = new VSMessage();
+        message.setBoolean("isAck", true);
+        message.setInteger("pid", process.getProcessID());
+        sendMessage(message);
+        ackSent = true;
+        log("Festgeschrieben");
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientSchedule()
+     */
+    public void onClientSchedule() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#toString()
+     */
+    public String toString() {
+        return super.toString();
+    }
+}