attempts to cancel this request . this attempt will fail if the request has already completed , has already been cancelled , or could not be cancelled for some other reason . if successful , and this request has not started when cancel is called , this request should never run . if the request has already started , then the mayinterruptifrunning parameter determines whether the thread executing this request should be interrupted in an attempt to stop the request . after this method returns , subsequent calls to isdone will always return true . subsequent calls to iscancelled will always return true if this method returned true . concode_field_sep Future<?> request concode_field_sep boolean isCancelled concode_elem_sep boolean isFinished
boolean function ( boolean arg0 ) { return this . request != null && request . cancel ( arg0 ) ; }