- PreDestroy : cancel pingTask
no message
Merge pull request #81 from thinker0/feature/cancelPingTask

- PreDestroy : cancel pingTask
Merge commit '82fbd6f94120a99205f1c1059abd8c09815477e0'

* commit '82fbd6f94120a99205f1c1059abd8c09815477e0':
  no message
  - PreDestroy : cancel pingTask