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// Remove a download from the list public void clearDownload(int row) { downloadListremove(row); // Fire table row deletion notification to table fireTableRowsDeleted(row, row); }

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After removing the Download from the internal list, a table row deleted event notification is fired to alert the table that a row has been deleted

The getColumnClass( ) method, shown here, returns the class type for the data displayed in the specified column:

The init process is the patron of all processes It is always the first process that gets started in any Linux/UNIX-based system The init daemon as it was traditionally known has been largely replaced on most new Linux distributions by a new upstart named upstart (pun intended!) According to Upstart s documentation, upstart is an event-based replacement for the init daemon which handles starting of tasks and services during boot, stopping them during shutdown, and supervising them while the system is running This same description of upstart pretty much describes the function of the init daemon except that upstart tries to achieve its stated objectives in a more elegant and robust manner Another stated objective of upstart is to achieve complete backward compatibility with init (sysvinit) Because upstart handles this backward compatibility with init so well and transparently, the rest of this section will focus mostly on the traditional init way of doing things The process ID for init is always 1 Should init ever fail, the rest of the system will most likely follow suit NOTE If one wants to be strictly technically correct, init is not actually the very first process that gets run But in order to remain politically correct, we ll assume that it is! You should also keep in mind that some so-called security-hardened Linux systems deliberately randomize the process identification (PID) of init, so don t be surprised if you ever find yourself on such a system and notice that the PID of init is not 1 The init process serves two roles The first is being the ultimate parent process Because init never dies, the system can always be sure of its presence and, if necessary, make reference to it The need to refer to init usually happens when a process dies before all of its spawned child processes have completed This causes the children to inherit init.

Place a series of blue and red circles on the floor in a long straight line. Have SPOT roll forward and follow the line of circles. When SPOT is over a red circle, yell out STOP! Create a program that will only stop SPOT s movement when both the color red is detected and the Sound sensor detects a noise over a level of 75.

// Get a column's class public Class getColumnClass(int col) { return columnClasses[col]; }

8:

All columns are displayed as text (that is, String objects) except for the Progress column, which is displayed as a progress bar (which is an object of type JProgressBar)

The getValueAt( ) method, shown next, is called to get the current value that should be displayed for each of the table s cells:

as their parent process A quick execution of the ps -ef command will show a number of processes that will have a parent process ID (PPID) of 1 The second job for init is to handle the various runlevels by executing the appropriate programs when a particular runlevel is reached This behavior is defined by the /etc/ inittab file

// Get value for a specific row and column combination public Object getValueAt(int row, int col) { Download download = downloadListget(row); switch (col) { case 0: // URL return downloadgetUrl(); case 1: // Size int size = downloadgetSize(); return (size == -1) "" : IntegertoString(size); case 2: // Progress return new Float(downloadgetProgress()); case 3: // Status

Part IV:

upstart: Die init Die Now!

return DownloadSTATUSES[downloadgetStatus()]; } return ""; }

This method first looks up the Download corresponding to the row specified Next, the column specified is used to determine which one of the Download s property values to return