update to 3.0.0-alpha2 (build 610): refactor driver

src/ZM/Store/Lock/FileLock.php

@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ZM\Store\Lock;
+
+use ZM\Exception\ZMKnownException;
+
+class FileLock
+{
+    private static $lock_file_handle = [];
+
+    private static $name_hash = [];
+
+    /**
+     * 基于文件的锁，适用于跨进程操作资源用的
+     *
+     * @throws ZMKnownException
+     */
+    public static function lock(string $name)
+    {
+        self::$name_hash[$name] = self::$name_hash[$name] ?? md5($name);
+        $lock_file = is_dir('/tmp') ? '/tmp' : WORKING_DIR . '.zm_' . zm_instance_id() . self::$name_hash[$name] . '.lock';
+        self::$lock_file_handle[$name] = fopen($lock_file, 'w');
+        if (self::$lock_file_handle[$name] === false) {
+            logger()->critical("Can not create lock file {$lock_file}\n");
+            throw new ZMKnownException('E99999', 'Can not create lock file ' . $lock_file);
+        }
+        if (!flock(self::$lock_file_handle[$name], LOCK_EX)) {
+            logger()->error("File Lock \"{$name}\"already exists.\n");
+        }
+    }
+
+    /**
+     * 解锁
+     *
+     * @param string $name 锁名
+     */
+    public static function unlock(string $name)
+    {
+        if ((self::$lock_file_handle[$name] ?? false) !== false) {
+            fclose(self::$lock_file_handle[$name]);
+        }
+    }
+}