1 files changed, 143 insertions, 0 deletions
diff --git a/sources/protocols/implementations/VSOnePhaseCommitProtocol.java b/sources/protocols/implementations/VSOnePhaseCommitProtocol.java
new file mode 100644
index 0000000..985378e
--- /dev/null
+++ b/sources/protocols/implementations/VSOnePhaseCommitProtocol.java
@@ -0,0 +1,143 @@
+/*
+ * VS is (c) 2008 by Paul C. Buetow
+ * vs@dev.buetow.org
+ */
+package protocols.implementations;
+
+import java.util.ArrayList;
+import java.util.Vector;
+
+import protocols.VSAbstractProtocol;
+import core.VSMessage;
+
+/**
+ * The Class VSOnePhaseCommitProtocol.
+ */
+public class VSOnePhaseCommitProtocol extends VSAbstractProtocol {
+    private static final long serialVersionUID = 1L;
+
+    /* Client variables, coordinator */
+    private ArrayList<Integer> pids;
+
+    /* 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(2);
+        vec.add(3);
+
+        initVector("pids", vec, "PIDs beteilitger Prozesse");
+        initLong("timeout", 2500, "Zeit bis erneuerter 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();
+            scheduleAt(timeout); /* Will run onServerSchedule() at the specified local time */
+
+            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;
+
+            logg("ACK von Prozess " + pid + " erhalten!");
+
+            if (pids.size() == 0)
+                logg("ACKs von allen beteiligten Prozessen erhalten! Festgeschrieben!");
+        }
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onServerSchedule()
+     */
+    public void onServerSchedule() {
+        onServerStart();
+    }
+
+    /* (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;
+        logg("Festgeschrieben");
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#onClientSchedule()
+     */
+    public void onClientSchedule() {
+    }
+
+    /* (non-Javadoc)
+     * @see protocols.VSAbstractProtocol#toString()
+     */
+    public String toString() {
+        return super.toString();
+    }
+}