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Listing 7-14. Changes to the ha_spartan_exts Array in ha_spartan.cc #define SDE_EXT ".sde" #define SDI_EXT ".sdi" ... static const char *ha_spartan_exts[] = { SDE_EXT, SDI_EXT, NullS }; The first operation you need to add is the create file operation. This will create the empty file to contain the data for the table. Locate the create() method and add the code to get a copy of the share structure, then call the data class create_table() method and close the table. Listing 7-15 shows the updated create method. I ll show you how to add the index class in a later stage. Listing 7-15. Changes to the create() Method in ha_spartan.cc int ha_spartan::create(const char *name, TABLE *table_arg, HA_CREATE_INFO *create_info) { DBUG_ENTER("ha_spartan::create"); char name_buff[FN_REFLEN]; if (!(share = get_share(name, table))) DBUG_RETURN(1); /* Call the data class create table method. Note: the fn_format() method correctly creates a file name from the name passed into the method. */ if (share->data_class->create_table(fn_format(name_buff, name, "", SDE_EXT, MY_REPLACE_EXT|MY_UNPACK_FILENAME))) DBUG_RETURN(-1); share->data_class->close_table(); } The next operation you need to add is the open file operation. This will open the file that contains the data for the table. Locate the open() method and add the code to get a copy of the share structure and open the table. Listing 7-16 shows the updated open method. I ll show you how to add the index class in a later stage. Listing 7-16. Changes to the open() Method in ha_spartan.cc int ha_spartan::open(const char *name, int mode, uint test_if_locked) { DBUG_ENTER("ha_spartan::open"); char name_buff[FN_REFLEN];

let dh = float32(plotBox.Height) / (hi - lo) let sx = int(pixelsPerUnit * i) let dx = int(pixelsPerUnit * (i + 1.0f)) let sy = int(dh * (data.GetValue(pos) - lo)) let dy = int(dh * (data.GetValue(pos + int64 timePerUnit) - lo)) g.DrawLine(linePen, sx, sy, dx, dy); drawSamples (i + 1.0f) (pos + int64 timePerUnit) drawSamples 0.0f initView

midline: int; }

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if (!(share = get_share(name, table))) DBUG_RETURN(1); /* Call the data class open table method. Note: the fn_format() method correctly creates a file name from the name passed into the method. */ share->data_class->open_table(fn_format(name_buff, name, "", SDE_EXT, MY_REPLACE_EXT|MY_UNPACK_FILENAME)); thr_lock_data_init(&share->lock,&lock,NULL); DBUG_RETURN(0); } Notice that I placed the code in a critical section identified between the method calls of pthread_mutex_lock(&spartan_mutex) and pthread_mutex_unlock(&spartan_mutex). I do this because there is only one instance of the data class object and I want to restrict access to the object when the code in the critical section is executed. Although not strictly necessary for all cases (like reading data), it is a good practice. The close operation is done for us in the free_share() method so you don t need to add anything there. The next operation you need to add is the delete file operation. This will delete the files that contain the data for the table. Locate the delete_table() method and add the code to get a copy of the share structure, close the table, and call the my_delete() function to delete the table. Listing 7-17 shows the updated delete method. I ll show you how to add the index class in a later stage. Listing 7-17. Changes to the delete_table() Method in ha_spartan.cc int ha_spartan::delete_table(const char *name) { DBUG_ENTER("ha_spartan::delete_table"); char name_buff[FN_REFLEN]; /* Begin critical section by locking the spartan mutex variable. */ pthread_mutex_lock(&spartan_mutex); if (!(share = get_share(name, table))) DBUG_RETURN(1); share->data_class->close_table(); /* Call the mysql delete file method. Note: the fn_format() method correctly creates a file name from the name passed into the method. */ my_delete(fn_format(name_buff, name, "", SDE_EXT, MY_REPLACE_EXT|MY_UNPACK_FILENAME), MYF(0)); /*

Flickering is a very annoying phenomenon of graphical applications. It happens when two updates of a graphical element are interleaved by a refresh of its background. The graphic adapter sends the video signal to the display, reading bytes from video memory at a given frequency that is different than the update frequency of the paint message. Flickering happens during animations when a pixel is cleared with the background color and then with the desired one. The graphic adapter may display the pixel before the update, making it blink. A standard technique to avoid this phenomenon is known as double buffering: it consists of performing the drawing primitives into a bitmap offscreen; then, when the entire drawing is finished, the bitmap is drawn. You can easily implement double buffering explicitly, although modern frameworks provide support for it. The example uses the SetStyle method inherited from UserControl to enable implicit support for double buffering. If you comment the two invocations to that method, you see flickering in action.

member self.CenterOnMidline size x y = x + (size.width-self.width)/2, y + (size.midline-self.midline) member self.Frac size opt = { width = max self.width size.width; height = self.height + size.height + self.FracSepHeight opt; midline = self.height + (self.FracSepHeight opt)/2; } member self.FracSepHeight (opt: RenderOptions) = max (int (opt.Pen.Width*5.0f)) 4 member self.AddPower (e: VisualElement) = { width = self.width + e.Width; height = self.height + e.Height; midline = self.midline + e.Height; } static member { width height midline ExpandOne (size: ExprSize) (e: VisualElement) = = size.width + e.Width; = max size.height e.Height; = max size.midline e.Midline; }

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