new branches

11 files changed, 1600 insertions, 0 deletions

diff --git a/VS-Sim-Sources/sources/protocols/implementations/README b/VS-Sim-Sources/sources/protocols/implementations/README
new file mode 100644
index 0000000..fd8effa
--- /dev/null
+++ b/VS-Sim-Sources/sources/protocols/implementations/README
@@ -0,0 +1,10 @@
+How to add a new protocol:
+
+1. Copy the file VSDummyProtocol.java into VSYourOwnNiceProtocol.java
+
+2. Edit VSYourOwnNiceProtocol.java and replace the classname!
+
+3. Edit the initialize method of events.RegisteredEvents.java and add the classname
+of your protocol.  E.g.: "protocols.implementations.VSYourOwnNiceProtocol"
+
+
diff --git a/VS-Sim-Sources/sources/protocols/implementations/VSBasicMulticastProtocol.java b/VS-Sim-Sources/sources/protocols/implementations/VSBasicMulticastProtocol.java
new file mode 100644
index 0000000..76b13b5
--- /dev/null
+++ b/VS-Sim-Sources/sources/protocols/implementations/VSBasicMulticastProtocol.java
@@ -0,0 +1,112 @@
+/*
+ * 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 protocols.VSAbstractProtocol;
+import core.VSMessage;
+
+/**
+ * The class VSBasicMulticastProtocol, an implementation of the basic multicast
+ * protocol.
+ *
+ * @author Paul C. Buetow
+ */
+public class VSBasicMulticastProtocol extends VSAbstractProtocol {
+    /** The serial version uid */
+    private static final long serialVersionUID = 1L;
+
+    /**
+     * Instantiates a new VSBasicMulticast object.
+     */
+    public VSBasicMulticastProtocol() {
+        super(VSAbstractProtocol.HAS_ON_CLIENT_START);
+        setClassname(getClass().toString());
+    }
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onClientInit()
+     */
+    public void onClientInit() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientReset()
+     */
+    public void onClientReset() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientStart()
+     */
+    public void onClientStart() {
+        VSMessage message = new VSMessage();
+        message.setBoolean("isMulticast", true);
+        sendMessage(message);
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientRecv(core.VSMessage)
+     */
+    public void onClientRecv(VSMessage recvMessage) {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientSchedule()
+     */
+    public void onClientSchedule() {
+    }
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onServerInit()
+     */
+    public void onServerInit() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerReset()
+     */
+    public void onServerReset() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerRecv(core.VSMessage)
+     */
+    public void onServerRecv(VSMessage recvMessage) {
+        if (recvMessage.getBoolean("isMulticast"))
+            log("Multicast erhalten");
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerSchedule()
+     */
+    public void onServerSchedule() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#toString()
+     */
+    public String toString() {
+        return super.toString();
+    }
+}
diff --git a/VS-Sim-Sources/sources/protocols/implementations/VSBerkelyTimeProtocol.java b/VS-Sim-Sources/sources/protocols/implementations/VSBerkelyTimeProtocol.java
new file mode 100644
index 0000000..1b69b72
--- /dev/null
+++ b/VS-Sim-Sources/sources/protocols/implementations/VSBerkelyTimeProtocol.java
@@ -0,0 +1,229 @@
+/*
+ * 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 protocols.VSAbstractProtocol;
+import core.VSMessage;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Vector;
+
+/**
+ * The class VSBerkelyTimeProtocol, an implementation of the berkely time
+ * protocol.
+ *
+ * @author Paul C. Buetow
+ */
+public class VSBerkelyTimeProtocol extends VSAbstractProtocol {
+    private static final long serialVersionUID = 1L;
+
+    /**
+     * Instantiates a new berkely time protocol.
+     */
+    public VSBerkelyTimeProtocol() {
+        super(VSAbstractProtocol.HAS_ON_SERVER_START);
+        setClassname(getClass().toString());
+    }
+
+    /** Integer: Process ID, Long: Local time of the process */
+    private HashMap<Integer,Long> processTimes = new HashMap<Integer,Long>();
+
+    /** Integer: Process ID, Long: Time of receiving the response from the
+     * process
+     */
+    private HashMap<Integer,Long> recvTimes = new HashMap<Integer,Long>();
+
+    /** Integer: Process ID, Long: Calculated process times (using the RTT) */
+    private HashMap<Integer,Long> realTimesRTT = new HashMap<Integer,Long>();
+
+    /** Contains all process IDs of processes which want to justify their
+     * time
+     */
+    private ArrayList<Integer> peers = new ArrayList<Integer>();
+
+    /** Time the request/response has started */
+    private long requestTime;
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onServerInit()
+     */
+    public void onServerInit() {
+        Vector<Integer> vec = new Vector<Integer>();
+        vec.add(1);
+        vec.add(3);
+        initVector("pids", vec, "PIDs beteiliger Prozesse");
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerReset()
+     */
+    public void onServerReset() {
+        //System.out.println("FOOBAR");
+        processTimes.clear();
+        recvTimes.clear();
+        realTimesRTT.clear();
+        peers.clear();
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerStart()
+     */
+    public void onServerStart() {
+        //System.out.println("FOO");
+        peers.addAll(getVector("pids"));
+        requestTime = process.getTime();
+        VSMessage message = new VSMessage();
+        message.setBoolean("isRequest", true);
+        sendMessage(message);
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerRecv(core.VSMessage)
+     */
+    public void onServerRecv(VSMessage recvMessage) {
+        /* Ignore all protocol messages which are not a response message,
+           e.g. itself */
+        if (!recvMessage.getBoolean("isResponse"))
+            return;
+
+        Integer processID = recvMessage.getIntegerObj("processID");
+
+        if (peers.contains(processID))
+            peers.remove(processID);
+        else
+            return; /* Process has been handled already or is not listed */
+
+        Long time = new Long(recvMessage.getLong("time"));
+
+        processTimes.put(processID, time);
+        recvTimes.put(processID, new Long(process.getTime()));
+
+        /* All peers have told their times */
+        if (peers.size() == 0) {
+            long avgTime = calculateAverageTime();
+            /* Set the local's process time to the new avg reference time */
+            process.setTime(avgTime);
+            /* Tell all other processes what to do in order to justify their
+               times */
+            sendJustifyRequests(avgTime);
+            /* Start "clean" next time */
+            onServerReset();
+        }
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerSchedule()
+     */
+    public void onServerSchedule() {
+    }
+
+    /**
+     * Calculate the new average time.
+     *
+     * @return the long
+     */
+    private long calculateAverageTime() {
+        long sum = 0;
+        for (Integer processID : processTimes.keySet()) {
+            Long localTime = processTimes.get(processID);
+            Long recvTime = recvTimes.get(processID);
+            long rtt = recvTime.longValue() - requestTime;
+            long realProcessTime = localTime + (long) (rtt / 2);
+            realTimesRTT.put(processID, new Long(realProcessTime));
+            sum += realProcessTime;
+        }
+        /* Include the time of the local process */
+        sum += process.getTime();
+        return (long) sum / (getVector("pids").size() + 1);
+    }
+
+    /**
+     * Sends to all clients a value to justify their local clocks.
+     *
+     * @param avgTime the avg time
+     */
+    private void sendJustifyRequests(long avgTime) {
+        for (Integer processID : processTimes.keySet()) {
+            long realProcessTime = realTimesRTT.get(processID).longValue();
+            long diff = avgTime - realProcessTime;
+            VSMessage message = new VSMessage();
+            message.setBoolean("isJustify", true);
+            message.setLong("timeDiff", diff);
+            message.setInteger("receiverProcessID", processID);
+            sendMessage(message);
+        }
+    }
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onClientInit()
+     */
+    public void onClientInit() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientReset()
+     */
+    public void onClientReset() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientRecv(core.VSMessage)
+     */
+    public void onClientRecv(VSMessage recvMessage) {
+        if (recvMessage.getBoolean("isRequest")) {
+            VSMessage message = new VSMessage();
+            message.setInteger("processID", process.getProcessID());
+            message.setLong("time", process.getTime());
+            message.setBoolean("isResponse", true);
+            sendMessage(message);
+
+        } else if (recvMessage.getBoolean("isJustify")) {
+            /* Check if it's "my" justify message */
+            if (recvMessage.getInteger("receiverProcessID") !=
+                    process.getProcessID())
+                return;
+
+            long timeDiff = recvMessage.getLong("timeDiff");
+            //long recvTime = process.getTime();
+            long newTime = process.getTime() + timeDiff;
+            log("Neue Zeit: " + newTime);
+
+            process.setTime(newTime);
+        }
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientSchedule()
+     */
+    public void onClientSchedule() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#toString()
+     */
+    public String toString() {
+        return super.toString();
+    }
+}
diff --git a/VS-Sim-Sources/sources/protocols/implementations/VSBroadcastProtocol.java b/VS-Sim-Sources/sources/protocols/implementations/VSBroadcastProtocol.java
new file mode 100644
index 0000000..0ae8fae
--- /dev/null
+++ b/VS-Sim-Sources/sources/protocols/implementations/VSBroadcastProtocol.java
@@ -0,0 +1,129 @@
+/*
+ * 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 core.VSMessage;
+import protocols.VSAbstractProtocol;
+
+/**
+ * The class VSBroadcastProtocol, an implementation of the broadcast
+ * sturm protocol.
+ *
+ * @author Paul C. Buetow
+ */
+public class VSBroadcastProtocol extends VSAbstractProtocol {
+    /** The serial version uid */
+    private static final long serialVersionUID = 1L;
+
+    /** The sent messages. */
+    private ArrayList<Integer> sentMessages;
+
+    /** The broadcast count. */
+    private static int broadcastCount;
+
+    /**
+     * Instantiates a new broadcast sturm protocol.
+     */
+    public VSBroadcastProtocol() {
+        super(VSAbstractProtocol.HAS_ON_CLIENT_START);
+        setClassname(getClass().toString());
+        sentMessages = new ArrayList<Integer>();
+    }
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onClientInit()
+     */
+    public void onClientInit() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientReset()
+     */
+    public void onClientReset() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientStart()
+     */
+    public void onClientStart() {
+        VSMessage message = new VSMessage();
+        message.setInteger("Broadcast", broadcastCount++);
+        sentMessages.add(message.getIntegerObj("Broadcast"));
+        sendMessage(message);
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientRecv(core.VSMessage)
+     */
+    public void onClientRecv(VSMessage recvMessage) {
+        onServerRecv(recvMessage);
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientSchedule()
+     */
+    public void onClientSchedule() {
+    }
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onServerInit()
+     */
+    public void onServerInit() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerReset()
+     */
+    public void onServerReset() {
+        sentMessages.clear();
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerSchedule()
+     */
+    public void onServerSchedule() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerRecv(core.VSMessage)
+     */
+    public void onServerRecv(VSMessage recvMessage) {
+        if (!sentMessages.contains(recvMessage.getIntegerObj("Broadcast"))) {
+            VSMessage message = new VSMessage();
+            message.setInteger("Broadcast",
+                               recvMessage.getInteger("Broadcast"));
+            sentMessages.add(message.getIntegerObj("Broadcast"));
+            sendMessage(message);
+        }
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#toString()
+     */
+    public String toString() {
+        return super.toString();
+    }
+}
diff --git a/VS-Sim-Sources/sources/protocols/implementations/VSDummyProtocol.java b/VS-Sim-Sources/sources/protocols/implementations/VSDummyProtocol.java
new file mode 100644
index 0000000..b06e256
--- /dev/null
+++ b/VS-Sim-Sources/sources/protocols/implementations/VSDummyProtocol.java
@@ -0,0 +1,124 @@
+/*
+ * 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 protocols.VSAbstractProtocol;
+import core.VSMessage;
+
+/**
+ * The class VSDummyProtocol, can be used as a template in order to create
+ * own protocols.
+ *
+ * @author Paul C. Buetow
+ */
+public class VSDummyProtocol extends VSAbstractProtocol {
+    /** The serial version uid */
+    private static final long serialVersionUID = 1L;
+
+    /**
+     * Instantiates a new dummy protocol object.
+     */
+    public VSDummyProtocol() {
+        super(VSAbstractProtocol.HAS_ON_CLIENT_START);
+        setClassname(getClass().toString());
+    }
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onClientInit()
+     */
+    public void onClientInit() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientReset()
+     */
+    public void onClientReset() {
+        log("onClientReset()");
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientStart()
+     */
+    public void onClientStart() {
+        log("onClientStart()");
+
+        VSMessage message = new VSMessage();
+        message.setString("Greeting", "Hello World!");
+        message.setInteger("A number", 1);
+        message.setBoolean("A boolean", true);
+        message.setFloat("A float", 1.2f);
+        sendMessage(message);
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientRecv(core.VSMessage)
+     */
+    public void onClientRecv(VSMessage recvMessage) {
+        log("onClientRecv("+recvMessage+")");
+
+        String s = recvMessage.getString("Greeting");
+        int n = recvMessage.getInteger("A number");
+        boolean b = recvMessage.getBoolean("A boolean");
+        float f = recvMessage.getFloat("A float");
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientSchedule()
+     */
+    public void onClientSchedule() {
+    }
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onServerInit()
+     */
+    public void onServerInit() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerReset()
+     */
+    public void onServerReset() {
+        log("onClientReset()");
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerRecv(core.VSMessage)
+     */
+    public void onServerRecv(VSMessage recvMessage) {
+        log("onServerRecv("+recvMessage+")");
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerSchedule()
+     */
+    public void onServerSchedule() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#toString()
+     */
+    public String toString() {
+        return super.toString() + "; Dummy Test";
+    }
+}
diff --git a/VS-Sim-Sources/sources/protocols/implementations/VSExternalTimeSyncProtocol.java b/VS-Sim-Sources/sources/protocols/implementations/VSExternalTimeSyncProtocol.java
new file mode 100644
index 0000000..3bb5eb9
--- /dev/null
+++ b/VS-Sim-Sources/sources/protocols/implementations/VSExternalTimeSyncProtocol.java
@@ -0,0 +1,145 @@
+/*
+ * 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 core.VSMessage;
+import protocols.VSAbstractProtocol;
+
+/**
+ * The class VSExternalTimeSyncProtocol, an implementation of the external
+ * time synchronisation protocol.
+ *
+ * @author Paul C. Buetow
+ */
+public class VSExternalTimeSyncProtocol extends VSAbstractProtocol {
+    /** The serial version uid */
+    private static final long serialVersionUID = 1L;
+
+    /** The request time. */
+    private long requestTime;
+
+    /** The server is waiting for response, if true. */
+    private boolean waitingForResponse;
+
+    /**
+     * Instantiates a new external time sync protocol object.
+     */
+    public VSExternalTimeSyncProtocol() {
+        super(VSAbstractProtocol.HAS_ON_CLIENT_START);
+        setClassname(getClass().toString());
+    }
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onClientInit()
+     */
+    public void onClientInit() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientReset()
+     */
+    public void onClientReset() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientStart()
+     */
+    public void onClientStart() {
+        requestTime = process.getTime();
+        waitingForResponse = true;
+
+        /* Multicast message to all processes */
+        VSMessage message = new VSMessage();
+        message.setBoolean("isClientRequest", true);
+        sendMessage(message);
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientRecv(core.VSMessage)
+     */
+    public void onClientRecv(VSMessage recvMessage) {
+        if (!recvMessage.getBoolean("isServerResponse"))
+            return;
+
+        if (waitingForResponse)
+            waitingForResponse = false;
+        else
+            return;
+
+        long recvTime = process.getTime();
+        long roundTripTime = recvTime - requestTime;
+        long serverTime = recvMessage.getLong("time");
+        long newTime = serverTime + (long) (roundTripTime / 2);
+
+        log("Server Zeit: " + serverTime + "; RTT: " + roundTripTime +
+            "; Alte Zeit: " + recvTime + "; Neue Zeit: " + newTime +
+            "; Offset: " + (newTime - recvTime));
+        process.setTime(newTime);
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientSchedule()
+     */
+    public void onClientSchedule() {
+    }
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onServerInit()
+     */
+    public void onServerInit() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerReset()
+     */
+    public void onServerReset() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerRecv(core.VSMessage)
+     */
+    public void onServerRecv(VSMessage recvMessage) {
+        if (!recvMessage.getBoolean("isClientRequest"))
+            return;
+
+        /* Multicast message to all processes */
+        VSMessage message = new VSMessage();
+        message.setLong("time", process.getTime());
+        message.setBoolean("isServerResponse", true);
+        sendMessage(message);
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerSchedule()
+     */
+    public void onServerSchedule() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#toString()
+     */
+    public String toString() {
+        return super.toString();
+    }
+}
diff --git a/VS-Sim-Sources/sources/protocols/implementations/VSInternalTimeSyncProtocol.java b/VS-Sim-Sources/sources/protocols/implementations/VSInternalTimeSyncProtocol.java
new file mode 100644
index 0000000..c52b0ed
--- /dev/null
+++ b/VS-Sim-Sources/sources/protocols/implementations/VSInternalTimeSyncProtocol.java
@@ -0,0 +1,149 @@
+/*
+ * 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 core.VSMessage;
+import protocols.VSAbstractProtocol;
+
+/**
+ * The class VSInternalTimeSyncProtocol, an implementation of the internal
+ * time synchronisation protocol.
+ *
+ * @author Paul C. Buetow
+ */
+public class VSInternalTimeSyncProtocol extends VSAbstractProtocol {
+    /** The serial version uid */
+    private static final long serialVersionUID = 1L;
+
+    /** The waiting for response. */
+    private boolean waitingForResponse;
+
+    /**
+     * Instantiates a new internal time sync protocol.
+     */
+    public VSInternalTimeSyncProtocol() {
+        super(VSAbstractProtocol.HAS_ON_CLIENT_START);
+        setClassname(getClass().toString());
+    }
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onClientInit()
+     */
+    public void onClientInit() {
+        initLong("t_min", 2000, "Max. Übetragungszeit", "ms");
+        initLong("t_max", 500, "Min. Übertragungszeit", "ms");
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientReset()
+     */
+    public void onClientReset() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientStart()
+     */
+    public void onClientStart() {
+        waitingForResponse = true;
+
+        /* Multicast message to all processes */
+        VSMessage message = new VSMessage();
+        message.setBoolean("isClientRequest", true);
+        sendMessage(message);
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientRecv(core.VSMessage)
+     */
+    public void onClientRecv(VSMessage recvMessage) {
+        /* Ignore all protocol messages which are not a response message,
+           e.g. itself */
+        if (!recvMessage.getBoolean("isServerResponse"))
+            return;
+
+        if (waitingForResponse)
+            waitingForResponse = false;
+        else
+            return;
+
+        long tMax = getLong("t_max");
+        long tMin = getLong("t_min");
+        long serverTime = recvMessage.getLong("time");
+        long newTime = serverTime + (long) ((tMax + tMin) / 2 );
+
+        log("Server Zeit: " + serverTime + "; (t_min,t_max): (" + tMin +
+            "," + tMax + "); Alte Zeit: " + process.getTime() +
+            "; Neue Zeit: " + newTime + "; Offset: " +
+            (process.getTime() - newTime));
+
+        process.setTime(newTime);
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientSchedule()
+     */
+    public void onClientSchedule() {
+    }
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onServerInit()
+     */
+    public void onServerInit() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerReset()
+     */
+    public void onServerReset() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerRecv(core.VSMessage)
+     */
+    public void onServerRecv(VSMessage recvMessage) {
+        /* Ignore all protocol messages which are not a request message,
+           e.g. itself */
+        if (!recvMessage.getBoolean("isClientRequest"))
+            return;
+
+        /* Multicast message to all processes */
+        VSMessage message = new VSMessage();
+        message.setLong("time", process.getTime());
+        message.setBoolean("isServerResponse", true);
+        sendMessage(message);
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerSchedule()
+     */
+    public void onServerSchedule() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#toString()
+     */
+    public String toString() {
+        return super.toString();
+    }
+}
diff --git a/VS-Sim-Sources/sources/protocols/implementations/VSOnePhaseCommitProtocol.java b/VS-Sim-Sources/sources/protocols/implementations/VSOnePhaseCommitProtocol.java
new file mode 100644
index 0000000..feb4dd5
--- /dev/null
+++ b/VS-Sim-Sources/sources/protocols/implementations/VSOnePhaseCommitProtocol.java
@@ -0,0 +1,174 @@
+/*
+ * 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();
+    }
+}
diff --git a/VS-Sim-Sources/sources/protocols/implementations/VSPingPongProtocol.java b/VS-Sim-Sources/sources/protocols/implementations/VSPingPongProtocol.java
new file mode 100644
index 0000000..f82d991
--- /dev/null
+++ b/VS-Sim-Sources/sources/protocols/implementations/VSPingPongProtocol.java
@@ -0,0 +1,136 @@
+/*
+ * 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 core.VSMessage;
+import protocols.VSAbstractProtocol;
+
+/**
+ * The class VSPingPongProtocol, an implementation of the ping pong protocol.
+ *
+ * @author Paul C. Buetow
+ */
+public class VSPingPongProtocol extends VSAbstractProtocol {
+    /** The serial version uid */
+    private static final long serialVersionUID = 1L;
+
+    /** The client counter. */
+    private int clientCounter;
+
+    /** The server counter. */
+    private int serverCounter;
+
+    /**
+     * Instantiates a new ping pong protocol.
+     */
+    public VSPingPongProtocol() {
+        super(VSAbstractProtocol.HAS_ON_CLIENT_START);
+        setClassname(getClass().toString());
+    }
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onClientInit()
+     */
+    public void onClientInit() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientReset()
+     */
+    public void onClientReset() {
+        clientCounter = 0;
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientStart()
+     */
+    public void onClientStart() {
+        VSMessage message = new VSMessage();
+        message.setBoolean("fromClient", true);
+        message.setInteger("counter", ++clientCounter);
+        sendMessage(message);
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientRecv(core.VSMessage)
+     */
+    public void onClientRecv(VSMessage recvMessage) {
+        if (!recvMessage.getBoolean("fromServer"))
+            return;
+
+        log("message: " + recvMessage.getInteger("counter"));
+
+        VSMessage message = new VSMessage();
+        message.setBoolean("fromClient", true);
+        message.setInteger("counter", ++clientCounter);
+        sendMessage(message);
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientSchedule()
+     */
+    public void onClientSchedule() {
+    }
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onServerInit()
+     */
+    public void onServerInit() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerReset()
+     */
+    public void onServerReset() {
+        serverCounter = 0;
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerRecv(core.VSMessage)
+     */
+    public void onServerRecv(VSMessage recvMessage) {
+        if (!recvMessage.getBoolean("fromClient"))
+            return;
+
+        log("message: " + recvMessage.getInteger("counter"));
+
+        VSMessage message = new VSMessage();
+        message.setBoolean("fromServer", true);
+        message.setInteger("counter", ++serverCounter);
+        sendMessage(message);
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerSchedule()
+     */
+    public void onServerSchedule() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#toString()
+     */
+    public String toString() {
+        return super.toString();
+    }
+}
diff --git a/VS-Sim-Sources/sources/protocols/implementations/VSReliableMulticastProtocol.java b/VS-Sim-Sources/sources/protocols/implementations/VSReliableMulticastProtocol.java
new file mode 100644
index 0000000..23f5857
--- /dev/null
+++ b/VS-Sim-Sources/sources/protocols/implementations/VSReliableMulticastProtocol.java
@@ -0,0 +1,168 @@
+/*
+ * 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 VSReliableMulticastProtocol, an implementation of the reliable
+ * multicast protocol.
+ *
+ * @author Paul C. Buetow
+ */
+public class VSReliableMulticastProtocol extends VSAbstractProtocol {
+    /** The serial version uid */
+    private static final long serialVersionUID = 2L;
+
+    /**
+     * 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);
+
+        initVector("pids", vec, "PIDs beteiligter Prozesse");
+        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 von Prozess " + pid + " erhalten!");
+
+            if (pids.size() == 0) {
+                log("ACKs von allen beteiligten Prozessen " +
+                    "erhalten!");
+
+                /* 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 erneut versendet");
+
+            } else {
+                log("ACK versendet");
+                ackSent = true;
+            }
+        }
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerSchedule()
+     */
+    public void onServerSchedule() {
+    }
+}
diff --git a/VS-Sim-Sources/sources/protocols/implementations/VSTwoPhaseCommitProtocol.java b/VS-Sim-Sources/sources/protocols/implementations/VSTwoPhaseCommitProtocol.java
new file mode 100644
index 0000000..2a0a4f2
--- /dev/null
+++ b/VS-Sim-Sources/sources/protocols/implementations/VSTwoPhaseCommitProtocol.java
@@ -0,0 +1,224 @@
+/*
+ * 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 VSTwoPhaseCommitProtocol, an implementation of the two phase
+ * commit protocol.
+ *
+ * @author Paul C. Buetow
+ */
+public class VSTwoPhaseCommitProtocol extends VSAbstractProtocol {
+    /** The serial version uid */
+    private static final long serialVersionUID = 1L;
+
+    /**
+     * Instantiates a two phase commit protocol object.
+     */
+    public VSTwoPhaseCommitProtocol() {
+        super(VSAbstractProtocol.HAS_ON_SERVER_START);
+        setClassname(getClass().toString());
+    }
+
+    /** PIDs of all processes which still have to vote */
+    private ArrayList<Integer> votePids;
+
+    /** PIDs of all processes which have to acknowledge that they recv the
+     * global vote result
+     */
+    private ArrayList<Integer> ackPids;
+
+    /** The gloal vote result */
+    private boolean voteResult;
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onServerInit()
+     */
+    public void onServerInit() {
+        Vector<Integer> vec = new Vector<Integer>();
+        vec.add(2);
+        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 (votePids != null) {
+            voteResult = true;
+            votePids.clear();
+            votePids.addAll(getVector("pids"));
+            ackPids.clear();
+            ackPids.addAll(getVector("pids"));
+        }
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerStart()
+     */
+    public void onServerStart() {
+        if (votePids == null) {
+            voteResult = true;
+            votePids = new ArrayList<Integer>();
+            votePids.addAll(getVector("pids"));
+            ackPids = new ArrayList<Integer>();
+            ackPids.addAll(getVector("pids"));
+        }
+
+        if (votePids.size() != 0) {
+            long timeout = getLong("timeout") + process.getTime();
+            /* Will run onServerSchedule() at the specified local time */
+            scheduleAt(timeout);
+
+            VSMessage message = new VSMessage();
+            message.setBoolean("wantVote", true);
+            sendMessage(message);
+
+        } else if (ackPids.size() != 0) {
+            long timeout = getLong("timeout") + process.getTime();
+            /* Will run onServerSchedule() at the specified local time */
+            scheduleAt(timeout);
+
+            VSMessage message = new VSMessage();
+            message.setBoolean("isVoteResult", true);
+            message.setBoolean("voteResult", voteResult);
+            sendMessage(message);
+        }
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerRecv(core.VSMessage)
+     */
+    public void onServerRecv(VSMessage recvMessage) {
+        if (votePids.size() != 0 && recvMessage.getBoolean("isVote")) {
+            Integer pid = recvMessage.getIntegerObj("pid");
+            if (votePids.contains(pid))
+                votePids.remove(pid);
+            else
+                return;
+
+            boolean vote = recvMessage.getBoolean("vote");
+            log("Abstimmung von Prozess " + pid +
+                " erhalten! Ergebnis: " + vote);
+
+            if (!vote)
+                voteResult = false;
+
+            if (votePids.size() == 0) {
+                log("Abstimmungen von allen beteiligten Prozessen " +
+                    "erhalten! Globales Ergebnis: " + voteResult);
+
+                /* Remove the active schedule which has been created in the
+                   onServerStart method */
+                removeSchedules();
+                /* Create a new schedule and send the vote result */
+                onServerStart();
+            }
+
+        } else if (ackPids.size() != 0 && recvMessage.getBoolean("isAck")) {
+            Integer pid = recvMessage.getIntegerObj("pid");
+            if (ackPids.contains(pid))
+                ackPids.remove(pid);
+            else
+                return;
+
+            if (ackPids.size() == 0) {
+                /* Remove the active schedule which has been created in the
+                   onServerStart method */
+                removeSchedules();
+                log("Alle Teilnehmer haben die Abstimmung erhalten");
+            }
+        }
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerSchedule()
+     */
+    public void onServerSchedule() {
+        onServerStart();
+    }
+
+    /* Server variables */
+    private boolean voteSent;
+    private boolean myVote;
+
+    /* (non-Javadoc)
+     * @see events.VSAbstractProtocol#onClientInit()
+     */
+    public void onClientInit() {
+        initInteger("ackProb", 50, "Festschreibw'keit", 0, 100, "%");
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientReset()
+     */
+    public void onClientReset() {
+        voteSent = false;
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientRecv(core.VSMessage)
+     */
+    public void onClientRecv(VSMessage recvMessage) {
+        if (recvMessage.getBoolean("wantVote")) {
+            if (!voteSent) {
+                voteSent = true;
+                myVote = process.getRandomPercentage() <= getInteger("ackProb");
+            }
+
+            VSMessage message = new VSMessage();
+            message.setBoolean("isVote", true);
+            message.setBoolean("vote", myVote);
+            message.setInteger("pid", process.getProcessID());
+            sendMessage(message);
+
+            log("Abstimmung " + myVote + " versendet");
+
+        } else if (recvMessage.getBoolean("isVoteResult")) {
+            boolean voteResult = recvMessage.getBoolean("voteResult");
+            log("Globales Abstimmungsergebnis erhalten. Ergebnis: " +
+                voteResult);
+
+            VSMessage message = new VSMessage();
+            message.setBoolean("isAck", true);
+            message.setInteger("pid", process.getProcessID());
+            sendMessage(message);
+        }
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientSchedule()
+     */
+    public void onClientSchedule() {
+    }
+}