question: public void close ( ) { synchronized ( this ) { if ( channel != null ) { try { channel . close ( ) ; } catch ( Exception ex ) { } channel = null ; } if ( m_out != null ) { m_out . shutdown ( ) ; m_out = null ; } if ( m_in != null ) { m_in . shutdown ( ) ; m_in = null ; } } List < TcpRequest > ls = new ArrayList < > ( requestMap . values ( ) ) ; for ( TcpRequest tr : ls ) { tr . weekup ( ) ; } }
target:  Close the packet handler