Rewrite

- rewritten all the sim code in a way to make easier to read and collect stats

src/main/java/net/berack/upo/valpre/ServerNode.java

@@ -0,0 +1,58 @@
+package net.berack.upo.valpre;
+
+import java.util.ArrayList;
+import java.util.List;
+import net.berack.upo.valpre.rand.Distribution;
+import net.berack.upo.valpre.rand.Rng;
+
+public class ServerNode {
+    public final String name;
+    public final int maxServers;
+    public final Distribution distribution;
+    public final boolean isSink;
+    public final boolean isSource;
+    private final List<NodeChild> children = new ArrayList<>();
+    private double sumProbabilities = 0.0;
+
+    public static ServerNode createSource(String name, Distribution distribution) {
+        return new ServerNode(name, Integer.MAX_VALUE, distribution, false, true);
+    }
+
+    public static ServerNode createQueue(String name, int maxServers, Distribution distribution) {
+        return new ServerNode(name, maxServers, distribution, false, false);
+    }
+
+    public ServerNode(String name, int maxServers, Distribution distribution, boolean isSink, boolean isSource) {
+        this.name = name;
+        this.maxServers = maxServers;
+        this.distribution = distribution;
+        this.isSink = isSink;
+        this.isSource = isSource;
+    }
+
+    public void addChild(ServerNode node, double probability) {
+        this.children.add(new NodeChild(node, probability));
+        this.sumProbabilities += probability;
+    }
+
+    public ServerNode getChild(Rng rng) {
+        var random = rng.random();
+        for (var child : this.children) {
+            random -= child.probability / this.sumProbabilities;
+            if (random <= 0) {
+                return child.node;
+            }
+        }
+        return null;
+    }
+
+    public static class NodeChild {
+        public final ServerNode node;
+        public final double probability;
+
+        public NodeChild(ServerNode node, double probability) {
+            this.node = node;
+            this.probability = probability;
+        }
+    }
+}