update code

README.md

@@ -64,7 +64,7 @@ create a task instance, return task instance.
 
 ```php
 Balancer::task('taskName', $data, function($task){
-    //task`s work
+    //task init work
 });
 ```
 

src/TaskBalancer/Balancer.php

@@ -13,12 +13,6 @@ class Balancer {
      */
     protected static $tasks = [];
 
-    /**
-     * running task instances
-     * @var array
-     */
-    protected static $runningTasks = [];
-
     /**
      * create a task instance
      * @param      $name

src/TaskBalancer/Driver.php

@@ -95,7 +95,7 @@ public static function create(Task $task, $name, $weight = 1, $isBackUp = false,
      * before run driver work
      * @return bool
      */
-    private function beforeRun()
+    protected function beforeRun()
     {
         $this->time['started_at'] = microtime();
         return true;
@@ -123,7 +123,7 @@ public function run()
      *
      * @return mixed
      */
-    private function afterRun($result)
+    protected function afterRun($result)
     {
         $this->time['finished_at'] = microtime();
         return $result;

src/TaskBalancer/Task.php

@@ -157,7 +157,7 @@ public function run($driverName = '')
      * before run task
      * @return bool
      */
-    private function beforeRun()
+    protected function beforeRun()
     {
         $pass = $this->callHookHandler('beforeRun');
         if ($pass) {
@@ -173,7 +173,7 @@ private function beforeRun()
      *
      * @return mixed
      */
-    private function afterRun($success)
+    protected function afterRun($success)
     {
         $this->status = static::FINISHED;
         $this->time['finished_at'] = microtime();