not working the code

[vikptest]

Thanks for the solution , i am using this code to run clear cache feature when saving a post in wordpress. But my run_action () not executing .Can you please help:
This is my code in functions.php
include 'wp-async-task.php';

class ApiStatusTask extends WP_Async_Task {

protected $action = 'save_post';

/**

• Prepare data for the asynchronous request
• @throws Exception If for any reason the request should not happen
• @param array $data An array of data sent to the hook
• @return array
  */
  protected function prepare_data( $data ) {
  return array(
  'api_url' => $data[0]
  );
  }

/**

• Run the async task action
  */
  protected function run_action() {
  if(isset($POST['api_url'])){
  do_action("wp_async$this->action", $_POST['api_url']);
  }
  // cache clear feature
  }

}

add_action( 'wp_async_save_post', 'josh_send_to_api' );
function josh_send_to_api( $id ) {
wp_mail("vinshakp7@gmail.com","subject","Content")
}