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Forking is where an instance of a program (a process) duplicates itself, resulting in two processes of that program running concurrently. You can run other programs from this second process by using exec, and the first (parent) process will continue running the original program. fork is a method provided by the Kernel module that creates a fork of the current process. It returns the child process s process ID in the parent, but nil in the child process you can use this to determine which process a script is in. The following example forks the current process into two processes, and only executes the exec command within the child process (the process generated by the fork):

protected void drawTimeSlots(PdfContentByte directcontent) { directcontent.saveState(); float x; for (int i = 1; i < TIMESLOTS; i++) { x = OFFSET_LEFT + (i * WIDTH_TIMESLOT); directcontent.moveTo(x, OFFSET_BOTTOM); Constructs directcontent.lineTo(x, OFFSET_BOTTOM + HEIGHT); path for line } directcontent.setLineWidth(0.3f); Changes directcontent.setColorStroke(BaseColor.GRAY); state directcontent.setLineDash(3, 1); directcontent.stroke(); Draws all directcontent.restoreState(); lines at once }

if fork.nil exec "ruby some_other_file.rb" end puts "This Ruby script now runs alongside some_other_file.rb"

In listing 3.3, you used stroke() or closePathStroke() after drawing every shape, but that wasn t really necessary. You can postpone changing the state until after you ve constructed all the paths. When you call stroke() in listing 3.4, the lines are drawn as 0.3 pt thick, gray dashed lines. You ve constructed the grid using the methods drawTimeTable() and drawTimeSlots(); now it s time to add screenings to the grid.

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If the other program (being run by exec) is expected to finish at some point, and you want to wait for it to finish executing before doing something in the parent program, you can use Process.wait to wait for all child processes to finish before continuing. Here s an example:

Just like you did on many occasions in chapter 2, you can let the PojoFactory query the database for you. Besides Movie, Director, and Country objects, the PojoFactory can create collections of Category, Entry, and Screening POJOs. Here you ll use a method that returns a List of locations (String objects) and festival days (java.sql.Date).

child = fork do sleep 3 puts "Child says 'hi'!" end puts "Waiting for the child process..." Process.wait child puts "All done!"

PdfContentByte over = writer.getDirectContent(); PdfContentByte under = writer.getDirectContentUnder(); try { DatabaseConnection connection = new HsqldbConnection("filmfestival"); locations = PojoFactory.getLocations(connection); Gets locations/dates List<Date> days = PojoFactory.getDays(connection); from database List<Screening> screenings; for (Date day : days) { drawTimeTable(under); Adds drawTimeSlots(over); background screenings = PojoFactory.getScreenings(connection, day); grid and for (Screening screening : screenings) { screenings drawBlock(screening, under, over); Starts new page } for new day document.newPage(); } connection.close(); }

Waiting for the child process... <3 second delay> Child says 'hi'! All done!

All of the .NET Framework classes reside in the System namespace. The System namespace is further subdivided by functionality. The functionality required to work with a database is contained in the System.Data namespace. Some namespaces run several levels deep; for example, the functionality used to connect to a SQL Server database is contained in the System.Data.SqlClient namespace. An assembly may be organized into a single namespace or multiple namespaces. Several assemblies may also be organized into the same namespace. To gain access to the classes in the .NET Framework, you need to reference the assembly that contains the namespace in your code. Then you can access classes in the assembly by providing their fully qualified names. For example, if you want to add a text box to a form, you create an instance of the System.Windows.Forms.TextBox class, like so: Private WithEvents textBox1 as System.Windows.Forms.TextBox Fortunately, in VB, you can use the imports statement so that you do not need to continually reference the fully qualified name in the code: Imports System.Windows.Forms Private WithEvents textBox1 as TextBox

You reuse the drawTimeTable() method from listing 3.3 to draw the table to the lowest direct content layer, and the drawTimeSlots() method to draw dashed lines to the upper direct content layer. The drawBlock() method that is called for every screening shouldn t hold too many secrets for you.

Note Forking is not possible with the Windows version of Ruby, as POSIX-style forking is not natively

Listing 3.6 MovieTimeBlocks.java (continued)

supported on that platform. However, threads, covered later in this chapter, provide a good alternative.

protected void drawBlock(Screening screening, PdfContentByte under, PdfContentByte over) { under.saveState(); BaseColor color = WebColors.getRGBColor( Translates color "#" + screening.getMovie().getEntry() code to BaseColor .getCategory().getColor()); under.setColorFill(color); Rectangle rect = getPosition(screening); under.rectangle(rect.getLeft(), rect.getBottom(), Fills rectangle under rect.getWidth(), rect.getHeight()); existing content under.fill(); over.rectangle(rect.getLeft(), rect.getBottom(), Strokes rectangle on rect.getWidth(), rect.getHeight()); top of existing content over.stroke(); under.restoreState(); }

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