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Starts the process on a separate thread asynchronously. Called from the main thread. Set the CancellationPending flag of the background task. Called from the main thread. Set to true by raising CancelAsync. Used by the worker thread. Set to true if the worker can support progress updates. Used by the main thread. Set to true if the worker can support cancellation of the current task in progress. Used by the main thread. Indicate the progress of the operation. Used by the worker thread. Fires in response to a call to RunWorkerAsync. Invoked on the worker thread. Fires when the background operation is canceled, when the operation is completed, or when an exception is thrown. Invoked on the main thread. Fires whenever the ReportProgress property is set. Invoked on the main thread.

I hope you will come away from this chapter with a better understanding of what it takes to build a storage engine and a proper respect for those MySQL storage engines that implement indexing and transaction support Neither of these tasks are trivial endeavors Finally, I must tell you that I have seen several areas of improvement for the data and index classes I have provided While the data class seems fine for most applications, the index class could be improved If you plan to use these classes as a jumping-off point for your own storage engine, I suggest getting your storage engine working with the classes as they are now and then going back and either updating or replacing them There are several areas in particular I recommend updating in the index class.

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Render = let pt x y = PointF(float32 x, float32 y) let rec draw (gra: Graphics) opt x y psize = function | Symbol (s, size) -> let font = if optIsSuper then optSmallFont else optNormalFont let x', y' = sizeCenterOnMidline psize x y graDrawString(s, font, optBrush, pt x' y') | Power (e1, e2, size) -> let x', y' = sizeCenterOnMidline psize x y draw gra opt x' (y'+e2Height) e1Size e1 draw gra { opt with IsSuper=true } (x'+e1Width) y' e2Size e2 | Sequence (exps, size) -> let x', y' = sizeCenterOnMidline psize x y Listfold (fun (x, y) (e: VisualElement) -> let psize' = { width = eWidth; height = psizeheight; midline=sizemidline; } draw gra opt x y psize' e x+e.

ReportProgress: int -> unit DoWork: IEvent<DoWorkEventArgs> RunWorkerCompleted: IEvent<RunWorkerCompletedEventArgs> ProgressChanged: IEvent<ProgressChangedEventArgs>

Perhaps the most important change I recommend is changing the internal buffer to a more efficient tree structure There are many to choose from, like the ubiquitous B-tree or hash mechanism I also suggest that you change the way the class handles range queries Lastly, there are several changes that need to be made to handle transaction support The class needs to support whatever buffer mechanism you use to handle commits and rollbacks In the next chapter, I ll examine one of the more popular extensions of the MySQL system This includes adding your own user-defined functions (UDFs), extending an existing SQL command, and adding your own SQL commands to the server These techniques permit the MySQL system to evolve even further to meet your specific needs for your environment..

Width, y) (x', y') exps |> ignore | Fraction (e1, e2, size) as e -> let psize1 = { psize with height=e1Height; midline=e1Midline } let psize2 = { psize with height=e2Height; midline=e2Midline } draw gra opt x y psize1 e1 graDrawLine(selfRenderOptionsPen, x, y+sizemidline, x+psizewidth, y+sizemidline); draw gra opt x (y+e1Height+sizeFracSepHeight opt) psize2 e2 let bmp = new Bitmap(selfExpressionWidth, selfExpressionHeight, PixelFormatFormat32bppArgb) let gra = GraphicsFromImage(bmp) graFillRectangle(new SolidBrush(ColorWhite), 0, 0, selfExpressionWidth+1, selfExpressionHeight+1) draw gra selfRenderOptions 0 0 selfExpressionSize selfExpression bmp.

Note Objects such as a BackgroundWorker are two-faced : they have some methods and events that are for use from the main thread and some that are for use on the worker thread. This is common in concurrent programming. In particular, be careful to understand which thread an event is raised on. For BackgroundWorker, the RunWorkerAsync and CancelAsync methods are for use from the GUI thread, and the ProgressChanged and RunWorkerCompleted events are raised on the GUI thread. The DoWork event is raised on the worker thread, and the ReportProgress method and the CancellationPending property are for use from the worker thread when handling this event.

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