diff --git a/src/id_generator.rs b/src/id_generator.rs
new file mode 100644
index 0000000..2e89049
--- /dev/null
+++ b/src/id_generator.rs
@@ -0,0 +1,39 @@
+use std::collections::VecDeque;
+use std::sync::atomic::{AtomicUsize, Ordering};
+
+
+
+pub struct IdGenerator {
+    name: String,
+    counter: AtomicUsize,
+    max_count: usize,
+    cache: VecDeque<usize>,
+}
+
+impl IdGenerator {
+    fn new(name: &str, max_count: usize) -> Self {
+        IdGenerator {
+            name: String::from(name),
+            counter: AtomicUsize::new(0),
+            max_count,
+            cache: VecDeque::new(),
+        }
+    }
+
+    fn name(&self) -> &String {
+        &self.name
+    }
+
+    fn poll(&mut self) -> usize {
+        if self.cache.is_empty() {
+            self.fill();
+        }
+        self.cache.pop_front().unwrap()
+    }
+
+    fn fill(&mut self) {
+        let current = self.counter.fetch_add(self.max_count, Ordering::Relaxed);
+        let new_ids = (current..(current + self.max_count)).collect::<Vec<usize>>();
+        self.cache.extend(new_ids);
+    }
+}
diff --git a/src/my_rpc_server.rs b/src/my_rpc_server.rs
index b02254f..2301637 100644
--- a/src/my_rpc_server.rs
+++ b/src/my_rpc_server.rs
@@ -21,13 +21,9 @@ pub mod bidirectional {
 }
 
 // my service
-pub mod id_generator;
 pub mod my_rpc_service;
-pub mod object_pool;
 pub mod quick_rpc_service;
-use id_generator::IdGenerator;
 use my_rpc_service::MyRpcService;
-use object_pool::ObjectPool;
 
 
 
diff --git a/src/object_pool.rs b/src/object_pool.rs
new file mode 100644
index 0000000..14bd5c6
--- /dev/null
+++ b/src/object_pool.rs
@@ -0,0 +1,49 @@
+use std::collections::HashMap;
+use std::sync::atomic::{AtomicPtr, Ordering};
+
+
+
+pub struct ObjectPool<T> {
+    objects: AtomicPtr<HashMap<String, T>>,
+}
+
+impl<T> ObjectPool<T> {
+    fn new() -> Self {
+        ObjectPool {
+            objects: AtomicPtr::new(std::ptr::null_mut()),
+        }
+    }
+
+    pub fn invoke<F1, F2, R>(&mut self, name: String, new_fn: F1, invoke_fn: F2) -> R
+    where
+        F1: FnOnce() -> T,
+        F2: FnOnce(&mut T) -> R,
+    {
+        let objects_map_ptr = self.objects.load(Ordering::Acquire);
+        let mut objects_map = unsafe { &mut *objects_map_ptr };
+
+        if objects_map_ptr.is_null() {
+            let new_map = Box::new(HashMap::new());
+            let new_map_ptr = Box::into_raw(new_map);
+            if self
+                .objects
+                .compare_exchange(objects_map_ptr, new_map_ptr, Ordering::Release, Ordering::Relaxed)
+                .is_ok()
+            {
+                objects_map = unsafe { &mut *new_map_ptr };
+            }
+        }
+
+        match objects_map.entry(name.clone()) {
+            std::collections::hash_map::Entry::Occupied(mut occupied_entry) => {
+                return invoke_fn(occupied_entry.get_mut());
+            }
+            std::collections::hash_map::Entry::Vacant(vacant_entry) => {
+                let mut new_object = new_fn();
+                let result = invoke_fn(&mut new_object);
+                vacant_entry.insert(new_object);
+                return result;
+            }
+        }
+    }
+}