[Example] Migrate example to the new module

example/src/main/java/Graph.java

@@ -0,0 +1,65 @@
+import java.util.HashMap;
+import java.util.Map;
+
+public final class Graph {
+    public int nextNodeId = 1;
+    public int nextPinId = 100;
+
+    public final Map<Integer, GraphNode> nodes = new HashMap<>();
+
+    public Graph() {
+        final GraphNode first = createGraphNode();
+        final GraphNode second = createGraphNode();
+        first.outputNodeId = second.nodeId;
+    }
+
+    public GraphNode createGraphNode() {
+        final GraphNode node = new GraphNode(nextNodeId++, nextPinId++, nextPinId++);
+        this.nodes.put(node.nodeId, node);
+        return node;
+    }
+
+    public GraphNode findByInput(final long inputPinId) {
+        for (GraphNode node : nodes.values()) {
+            if (node.getInputPinId() == inputPinId) {
+                return node;
+            }
+        }
+        return null;
+    }
+
+    public GraphNode findByOutput(final long outputPinId) {
+        for (GraphNode node : nodes.values()) {
+            if (node.getOutputPinId() == outputPinId) {
+                return node;
+            }
+        }
+        return null;
+    }
+
+    public static final class GraphNode {
+        public final int nodeId;
+        public final int inputPinId;
+        public final int outputPinId;
+
+        public int outputNodeId = -1;
+
+        public GraphNode(final int nodeId, final int inputPinId, final int outputPintId) {
+            this.nodeId = nodeId;
+            this.inputPinId = inputPinId;
+            this.outputPinId = outputPintId;
+        }
+
+        public int getInputPinId() {
+            return inputPinId;
+        }
+
+        public int getOutputPinId() {
+            return outputPinId;
+        }
+
+        public String getName() {
+            return "Node " + (char) (64 + nodeId);
+        }
+    }
+}