Modernize project structure, update Maven config, move sources, add logging config, update README and .gitignore

1 files changed, 196 insertions, 0 deletions

diff --git a/src/main/java/protocols/implementations/VSTwoPhaseCommitProtocol.java b/src/main/java/protocols/implementations/VSTwoPhaseCommitProtocol.java
new file mode 100644
index 0000000..8f9e4a3
--- /dev/null
+++ b/src/main/java/protocols/implementations/VSTwoPhaseCommitProtocol.java
@@ -0,0 +1,196 @@
+package protocols.implementations;
+
+import java.util.ArrayList;
+import java.util.Vector;
+
+import core.VSMessage;
+import protocols.VSAbstractProtocol;
+
+/**
+ * The class VSTwoPhaseCommitProtocol, an implementation of the two phase
+ * commit protocol.
+ *
+ * @author Paul C. Buetow
+ */
+public class VSTwoPhaseCommitProtocol extends VSAbstractProtocol {
+    /**
+     * 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("Vote from process " + pid + " received! Result: " + vote);
+
+            if (!vote)
+                voteResult = false;
+
+            if (votePids.size() == 0) {
+                log("Votes from all involved processes received! Global result: " + 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("All participants have received the vote");
+            }
+        }
+    }
+
+    /* (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("Vote " + myVote + " sent");
+
+
+        } else if (recvMessage.getBoolean("isVoteResult")) {
+            boolean voteResult = recvMessage.getBoolean("voteResult");
+            log("Global voting result received. Result: " + 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() {
+    }
+}