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Let s take a moment to look at how to implement one of the primitive Async<'a> actions we ve been using earlier in the chapter. Listing 13-8 shows the essence of the implementation of Stream.ReadAsync, which is a primitive asynchronous action that wraps a pair of Stream.BeginRead and Stream.EndRead calls using Async.Primitive. We implement this as an extension to the System.IO.Stream type to ensure it is easy to find the asynchronous version of this functionality alongside existing functions (extension members were described in 6). Listing 13-8. An Implementation of an Async.Primitive open System let trylet f x = (try Choice2_1 (f x) with exn -> Choice2_2(exn)) let protect cont econt f x = match trylet f x with | Choice2_1 v -> cont v | Choice2_2 exn -> econt exn type System.IO.Stream with member stream.ReadAsync (buffer,offset,count) = Async.Primitive (fun (cont,econt) -> stream.BeginRead (buffer=buffer, offset=offset, count=count, state=null, callback=AsyncCallback(protect cont econt stream.EndRead)) |> ignore) The type of Async.Primitive is as follows:

names. But more commonly, the source object will be a business object, in which case the list of public properties and fields is returned.

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The inferred type of the extension to the System.IO.Stream type in Listing 13-8 is as follows: type System.IO.Stream with member ReadAsync: buffer:byte[] * offset:int * count:int -> Async<int> In Listing 13-8, Async.Primitive builds an Async<int> value, where the integer result indicates the number of bytes read from the stream. But what are all these function values As you saw earlier, asynchronous computations work via continuations. This means a primitive step is given two continuation functions, cont and econt, which must be called upon success and/or exceptional failure of the operation. The previous implementation calls BeginRead and passes it a callback that will be invoked when the asynchronous operation returns. Note that the call to BeginRead uses named arguments, covered in 6. The callback calls EndRead to retrieve the result and passes this result to the success continuation cont; the call to EndRead is protected by an exception handler that calls the exception continuation econt should something go wrong. The simple wrapper shown in Listing 13-8 now allows us to use ReadAsync in workflows, such as in the following line of our asynchronous image processor: async { use inStream = File.OpenRead(sprintf "Image%d.tmp" i) let! pixels = inStream.ReadAsync(numPixels) ... } Note that the econt continuation of a primitive step should be called if an exception occurs. The example includes the try/catch handlers required to catch exceptions from EndRead. For more details, see the full implementation of ReadAsync and other similar wrappers in the F# library source code.

Note Notice that even though the problem was caused by a specific browser, there s still no need to use browser-sniffing code. Sniffing for a specific browser name and number is bound to cause problems and result in very convoluted code.

The GetColumns() method determines the type of the source object and dispatches the work to typespecific helper methods: private List<string> GetColumns(object source) { List<string> result; // first handle DataSet/DataTable object innerSource; IListSource iListSource = source as IListSource; if (iListSource != null) innerSource = iListSource.GetList(); else innerSource = source; DataView dataView = innerSource as DataView; if (dataView != null) result = ScanDataView(dataView); else { // now handle lists/arrays/collections IEnumerable iEnumerable = innerSource as IEnumerable; if (iEnumerable != null) { Type childType = Utilities.GetChildItemType( innerSource.GetType()); result = ScanObject(childType); } else { // the source is a regular object result = ScanObject(innerSource.GetType()); } } return result; } As in GetIList(), if the source object implements IListSource, then its GetList() method is called to retrieve the underlying IList object.

Async.Parallel can appear magical. Computation tasks are created, executed, and resynchronized almost without effort. However, Listing 13-9 shows that a basic implementation of this operator is simple and again helps you see how Async<'a> values work under the hood. Listing 13-9. A Basic Implementation of Async.Parallel let Parallel(taskSeq) = Async.Primitive (fun (cont,econt) -> let tasks = Seq.to_array taskSeq let count = ref tasks.Length let results = Array.zero_create tasks.Length tasks |> Array.iteri (fun i p -> Async.Spawn (async { let! res = p do results.[i] <- res; let n = System.Threading.Interlocked.Decrement(count) do if n=0 then cont results })))

Next, that object is checked to see if it is a DataView. If so, a ScanDataView() method is called to pull the column names off the DataView object: private List<string> ScanDataView(DataView ds) { List<string> result = new List<string>(); for (int field = 0; field < ds.Table.Columns.Count; field++) result.Add(ds.Table.Columns[field].ColumnName); return result; }

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