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This basic implementation Parallel first converts the input task sequence to an array and then creates mutable state count and results to record the progress of the parallel computations. It then iterates through the tasks and queues each for execution in the .NET thread pool. Upon completion, each writes its result and decrements the counter using an atomic Interlocked. Decrement operator, discussed further in the section Understanding Shared-Memory Concurrency at the end of this chapter. The last process to finish calls the continuation with the collected results. In practice, Parallel is implemented slightly differently to take into account exceptions and cancellation; once again, see the F# library code for full details.

This is the simplest scenario, since the DataView object provides an easy interface to retrieve the list of columns.

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If the source object isn t a DataView, but does directly implement the IEnumerable interface, then the type of the child object is retrieved using a helper method from the Utilities class named GetChildItemType(): IEnumerable iEnumerable = innerSource as IEnumerable; if (iEnumerable != null) { Type childType = Utilities.GetChildItemType( innerSource.GetType()); result = ScanObject(childType); } The Utilities.GetChildItemType() helper method checks to see if the type is an array. If so, it returns the array s element type otherwise, it scans the properties of listType to find the indexer: public static Type GetChildItemType(Type listType) { Type result = null; if (listType.IsArray) result = listType.GetElementType(); else { DefaultMemberAttribute indexer = (DefaultMemberAttribute)Attribute.GetCustomAttribute( listType, typeof(DefaultMemberAttribute)); if (indexer != null) foreach (PropertyInfo prop in listType.GetProperties( BindingFlags.Public | BindingFlags.Instance | BindingFlags.FlattenHierarchy)) { if (prop.Name == indexer.MemberName) result = Utilities.GetPropertyType(prop.PropertyType); } } return result; } The indexer property can be identified because it will have the [DefaultMember()] attribute added by the compiler. If an indexer is found, the type returned by that indexer property is returned as a result. If neither the array nor indexer approaches work, then it isn t possible to determine the type of the child object, so null is returned.

Two recurring topics in asynchronous programming are exceptions and cancellation. Let s first explore some of the behavior of asynchronous programs with regard to exceptions. > let failingTask = async { do failwith "fail" };; val failingTask: Async<unit> > Async.Run failingTask;; Microsoft.FSharp.Core.FailureException: fail stopped due to error > let failingTasks = [ async { do failwith "fail A" }; async { do failwith "fail B" }; ];; val failingTasks: Async<unit> > Async.Run (Async.Parallel failingTasks);; Microsoft.FSharp.Core.FailureException: fail A stopped due to error > Async.Run (Async.Parallel failingTasks);; Microsoft.FSharp.Core.FailureException: fail B stopped due to error From this you can see the following: Tasks fail only when they are actually executed. The construction of a task using the async { ... } syntax will never fail. Tasks run using Async.Run report any failure back to the controlling thread as an exception. It is nondeterministic which task will fail first. Tasks composed using Async.Parallel report the first failure from amongst the collected set of tasks. An attempt is made to cancel other tasks by setting the cancellation flag for the group of tasks, and any further failures are ignored. You can wrap a task using the Async.Catch combinator. This has the following type:

Back in the GetColumns() method, a ScanObject() method is called, passing the type of the child object as a parameter. The ScanObject() uses reflection against that type. If you recall, the GetColumns() method itself might also call ScanObject() if it detects that the source object wasn t a collection but was a single, complex struct or object: // the source is a regular object return ScanObject(innerSource.GetType());

For example: > Async.Run (Async.Catch failingTask);; val it : Choice<unit,exn> = Choice2_2 (FailureException ()) You can also handle errors by using try/finally in an async { ... } workflow.

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