question: private byte [ ] readBytesNonBlocking ( Context ctx ) throws IOException , IOFilterException { ByteBuffer bytes = readBytesFromChannelNoneBlocking ( ctx ) ; if ( bytes == null ) { return null ; } if ( ctx . phase == Context . Phase . FINISH ) { if ( _filterManager == null || ctx . isSystemRequest ( ) ) return bytes . array ( ) ; return _filterManager . handleNoneBlockingContant ( ctx , toByteArray ( bytes ) ) ; } return null ; }
target:  Reads from socket to _bytes.