diff --git a/PoolItem.php b/PoolItem.php
index 7f511bf..5f63df1 100644
--- a/PoolItem.php
+++ b/PoolItem.php
@@ -1,147 +1,163 @@
-<?php
-declare(strict_types=1);
-
-namespace Kiri\Pool;
-
-use Closure;
-use Swoole\Coroutine\Channel;
-use Swoole\Coroutine;
-
-class PoolItem
-{
-
-
-    /**
-     * @var Channel|SplQueue
-     */
-    private Channel|SplQueue $_items;
-
-
-    /**
-     * @var int
-     */
-    private int $created = 0;
-
-
-    /**
-     * @param int $maxCreated
-     * @param Closure|array $callback
-     */
-    public function __construct(readonly public int $maxCreated, readonly public Closure|array $callback)
-    {
-        $this->reconnect();
-    }
-
-
-    /**
-     * @return bool
-     */
-    public function isClose(): bool
-    {
-        if ($this->_items instanceof Channel) {
-            return $this->_items->errCode == SWOOLE_CHANNEL_CLOSED;
-        }
-        return false;
-    }
-
-
-    /**
-     * @return void
-     */
-    public function reconnect(): void
-    {
-        if (Coroutine::getCid() > -1) {
-            $this->_items = new Channel($this->maxCreated);
-        } else {
-            $this->_items = new SplQueue($this->maxCreated);
-        }
-    }
-
-
-    /**
-     * @param Channel|SplQueue $items
-     */
-    public function setItems(Channel|SplQueue $items): void
-    {
-        $this->_items = $items;
-    }
-
-
-    /**
-     * @param mixed $item
-     * @return void
-     */
-    public function push(mixed $item): void
-    {
-        if (is_null($item)) {
-            return;
-        }
-        $this->_items->push($item);
-    }
-
-
-    /**
-     * @return bool
-     */
-    public function isEmpty(): bool
-    {
-        return $this->_items->isEmpty();
-    }
-
-
-    /**
-     * @return int
-     */
-    public function size(): int
-    {
-        return $this->_items->length();
-    }
-
-
-    /**
-     * @return bool
-     */
-    public function close(): bool
-    {
-        return $this->_items->close();
-    }
-
-
-    /**
-     * @param int $min
-     * @return void
-     */
-    public function tailor(int $min = 0): void
-    {
-        while ($this->_items->length() > $min) {
-            $connection = $this->_items->pop(0.000001);
-            if ($connection instanceof StopHeartbeatCheck) {
-                $connection->stopHeartbeatCheck();
-            }
-            $connection = null;
-        }
-    }
-
-
-    /**
-     * @return void
-     */
-    public function abandon(): void
-    {
-        $this->created -= 1;
-    }
-
-
-    /**
-     * @param int $waite
-     * @return mixed
-     */
-    public function pop(int $waite = 10): mixed
-    {
-        if ($this->_items->isEmpty()) {
-            return call_user_func($this->callback);
-        } else {
-            return $this->_items->pop($waite);
-        }
-    }
-}
+<?php
+declare(strict_types=1);
+
+namespace Kiri\Pool;
+
+use Closure;
+use Swoole\Coroutine\Channel;
+use Swoole\Coroutine;
+
+class PoolItem
+{
+
+
+    /**
+     * @var Channel|SplQueue
+     */
+    private Channel|SplQueue $_items;
+
+
+    /**
+     * @var int 当前已创建的连接数
+     */
+    private int $created = 0;
+
+
+    /**
+     * @param int $maxCreated 最大允许创建的连接数
+     * @param Closure|array $callback 创建新连接的回调函数
+     */
+    public function __construct(readonly public int $maxCreated, readonly public Closure|array $callback)
+    {
+        $this->reconnect();
+    }
+
+
+    /**
+     * @return bool 判断 Channel 是否已关闭
+     */
+    public function isClose(): bool
+    {
+        if ($this->_items instanceof Channel) {
+            return $this->_items->errCode == SWOOLE_CHANNEL_CLOSED;
+        }
+        return false;
+    }
+
+
+    /**
+     * 重新创建内部存储队列（Channel 或 SplQueue）
+     * @return void
+     */
+    public function reconnect(): void
+    {
+        if (Coroutine::getCid() > -1) {
+            $this->_items = new Channel($this->maxCreated);
+        } else {
+            $this->_items = new SplQueue($this->maxCreated);
+        }
+		$this->created = 0;
+    }
+
+
+    /**
+     * @param Channel|SplQueue $items
+     */
+    public function setItems(Channel|SplQueue $items): void
+    {
+        $this->_items = $items;
+    }
+
+
+    /**
+     * 将连接推回池中
+     * @param mixed $item 连接对象
+     * @return void
+     */
+    public function push(mixed $item): void
+    {
+        if (is_null($item)) {
+            return;
+        }
+        $this->_items->push($item);
+    }
+
+
+    /**
+     * @return bool 判断池是否为空
+     */
+    public function isEmpty(): bool
+    {
+        return $this->_items->isEmpty();
+    }
+
+
+    /**
+     * @return int 当前池中可用连接数
+     */
+    public function size(): int
+    {
+        return $this->_items->length();
+    }
+
+
+    /**
+     * @return bool 关闭连接池
+     */
+    public function close(): bool
+    {
+        return $this->_items->close();
+    }
+
+
+    /**
+     * 缩容连接池，将连接数缩减至 min 个
+     * @param int $min 保留的最小连接数
+     * @return void
+     */
+    public function tailor(int $min = 0): void
+    {
+        while ($this->_items->length() > $min) {
+            $connection = $this->_items->pop(0.000001);
+            if ($connection instanceof StopHeartbeatCheck) {
+                $connection->stopHeartbeatCheck();
+            }
+			// 关闭连接释放底层资源
+			if (is_object($connection) && method_exists($connection, 'close')) {
+				$connection->close();
+			}
+			$this->created--;
+            $connection = null;
+        }
+    }
+
+
+    /**
+     * 创建连接失败时回退计数器
+     * @return void
+     */
+    public function abandon(): void
+    {
+		if ($this->created > 0) {
+			$this->created -= 1;
+		}
+    }
+
+
+    /**
+     * 从连接池中获取一个连接
+     * 当未达到最大创建数时直接创建新连接，达到上限后阻塞等待归还
+     * @param int $waite 等待超时时间（秒）
+     * @return mixed 连接对象，超时返回 false
+     */
+    public function pop(int $waite = 10): mixed
+    {
+		// 未达到最大创建数，直接创建新连接
+        if ($this->created < $this->maxCreated) {
+			$this->created++;
+			return call_user_func($this->callback);
+        }
+		// 已达到最大创建数，阻塞等待连接归还
+        return $this->_items->pop($waite);
+    }
+}