question: public void serialize ( String name , byte [ ] message , OutputStream out ) throws IOException { byte [ ] header = new byte [ 4 + COMMAND_LEN + 4 + 4 ] ; uint32ToByteArrayBE ( params . getPacketMagic ( ) , header , 0 ) ; for ( int i = 0 ; i < name . length ( ) && i < COMMAND_LEN ; i ++ ) { header [ 4 + i ] = ( byte ) ( name . codePointAt ( i ) & 0xFF ) ; } Utils . uint32ToByteArrayLE ( message . length , header , 4 + COMMAND_LEN ) ; byte [ ] hash = doubleDigest ( message ) ; System . arraycopy ( hash , 0 , header , 4 + COMMAND_LEN + 4 , 4 ) ; out . write ( header ) ; out . write ( message ) ; if ( log . isDebugEnabled ( ) ) log . debug ( "Sending {} message: {}" , name , bytesToHexString ( header ) + bytesToHexString ( message ) ) ; }
target:  Writes message to to the output stream.