diff --git a/src/tools/CMakeLists.txt b/src/tools/CMakeLists.txt
index f10c70d..4113960 100644
--- a/src/tools/CMakeLists.txt
+++ b/src/tools/CMakeLists.txt
@@ -25,6 +25,8 @@ add_mnode_dev_executable(mana_auto_replay)
 target_link_libraries(mana_auto_replay PRIVATE mana mnode::resources)
 add_mnode_dev_executable(mana_nng_client)
 target_link_libraries(mana_nng_client PRIVATE mana mnode::resources)
+add_mnode_dev_executable(mana1)
+target_link_libraries(mana1 PRIVATE mana mnode::resources)
 
 add_mnode_proto_dev_executable(mnode_proto_test1)
 add_mnode_proto_dev_executable(mnode_proto_ping_client)
diff --git a/src/tools/mana1.cc b/src/tools/mana1.cc
new file mode 100644
index 0000000..46421bd
--- /dev/null
+++ b/src/tools/mana1.cc
@@ -0,0 +1,112 @@
+#include <algorithm>
+#include <iostream>
+#include <memory>
+#include <spdlog/fmt/fmt.h>
+#include <string>
+#include <vector>
+
+struct ArrayDescriptor
+{
+    std::string data_type;
+    size_t size;
+    size_t bits;
+    double lower_limit;
+    double upper_limit;
+    std::vector<std::string> names;
+};
+
+namespace detail
+{
+template <typename T> struct Node: public std::enable_shared_from_this<Node<T>>
+{
+    std::string name;
+    std::weak_ptr<Node<T>> parent;
+    std::vector<std::shared_ptr<Node<T>>> children;
+    T data;
+
+    std::shared_ptr<Node<T>> add_child(const std::string &name)
+    {
+        auto child = std::make_shared<Node<T>>();
+        child->name = name;
+        child->parent = this->shared_from_this();
+        children.push_back(child);
+        return child;
+    }
+
+    std::shared_ptr<Node<T>> get(const std::string &name) const
+    {
+        if (auto it = std::find_if(std::begin(children), std::end(children),
+                                   [&](const auto &child) { return child->name == name; });
+            it != std::end(children))
+        {
+            return *it;
+        }
+
+        return {};
+    }
+
+    std::shared_ptr<Node<T>> get(const std::string &name)
+    {
+        if (auto ret = const_cast<const Node<T> *>(this)->get(name))
+            return ret;
+        return add_child(name);
+    }
+};
+} // namespace detail
+
+using Node = detail::Node<ArrayDescriptor>;
+
+void print_preorder(const std::shared_ptr<Node> &node, int depth)
+{
+    for (int i = 0; i < depth; ++i)
+        std::cout << "  ";
+    std::cout << "name=" << node->name;
+    if (node->data.size > 0)
+        std::cout << ", size=" << node->data.size;
+    std::cout << std::endl;
+
+    for (const auto &child: node->children)
+        print_preorder(child, depth + 1);
+}
+
+void print_bfs(const std::shared_ptr<Node> &node)
+{
+    std::vector<std::shared_ptr<Node>> queue;
+    queue.push_back(node);
+
+    while (!queue.empty())
+    {
+        auto current = queue.front();
+        queue.erase(queue.begin());
+
+        std::cout << "name=" << current->name;
+        if (current->data.size > 0)
+            std::cout << ", size=" << current->data.size;
+        std::cout << std::endl;
+
+        for (const auto &child: current->children)
+            queue.push_back(child);
+    }
+}
+
+int main(int argc, char *argv[])
+{
+    auto root = std::make_shared<Node>();
+    root->name = "root";
+    root->get("m0")->get("a00")->data.size = 16;
+    root->get("m0")->get("a01")->data.size = 16;
+    root->get("m1")->get("a10")->data.size = 32;
+    root->get("m1")->get("a10")->add_child("a100")->data.size = 32;
+    root->get("m1")->get("a10")->add_child("a101")->data.size = 4;
+    root->get("m1")->get("a11")->add_child("a110")->data.size = 32;
+    root->get("m1")->get("a12")->data.size = 8;
+    root->get("m1")->get("a12")->add_child("a120")->data.size = 16;
+    root->get("m1")->get("a12")->add_child("a121")->data.size = 16;
+    root->get("m1")->get("a12")->add_child("a122")->data.size = 16;
+
+    std::cout << "preorder:\n";
+    print_preorder(root, 0);
+
+    std::cout << "bfs:\n";
+    print_bfs(root);
+}