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In order to support the enhanced for loop, the SQLException class now implements the Iterable<T> interface, where T is Throwable. The internal vector of SQLException objects can be looped through easily in the catch clause of your JDBC code.

Returns true if the Task has been cancelled (see the Cancelling Tasks section later in this chapter). Returns true if the Task has competed. Returns true if the Task has encountered an exception ( see the Handling Task Exceptions section later in this chapter for more details).

The IsCompleted property will return true if the Task has completed, even if the reason for its completion is because the Task was cancelled or because it encountered an Exception. See the relevant sections later in this chapter for details of cancelling Tasks and handling exceptions in Tasks.

Occasionally, you will want to stop a Task without waiting for it to complete its work; for example, in response to the user clicking a Cancel button. The TPL has a mechanism for supporting Task cancellation using a technique called cooperative cancelation meaning that your Task body has to be written so that it checks to see if the Task has been cancelled. Listing 24-11 shows how to cancel a Task. Listing 24-11. Canceling a Task using System; using System.Threading; using System.Threading.Tasks; class Listing 11 { static void Main(string[] args) { // create a token source CancellationTokenSource cancelTS = new CancellationTokenSource(); // create and start a Task using the Token Task myTask = Task.Factory.StartNew(() => { long total = 0; // do some work

Console.WriteLine("Doing first chunk of work..."); for (int i = 0; i < int.MaxValue; i++) { total += i; } // check to see if we have been canceled if (cancelTS.Token.IsCancellationRequested) { Console.WriteLine("Cancellation detected"); // we can perform any tidying up here - closing streams, etc // throw an exception to show that we have canceled properly throw new OperationCanceledException(cancelTS.Token); } // do some more work Console.WriteLine("Doing second chunk of work..."); for (int i = 0; i > int.MinValue; i--) { total += i; } // print out the total Console.WriteLine("Total: {0}", total); }, cancelTS.Token); // read a line from the Console Console.WriteLine("Press enter to cancel token"); Console.ReadLine(); // cancel the token Console.WriteLine("Token canceled"); cancelTS.Cancel(); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The first step in creating a cancelable Task is to create an instance of the CancellationTokenSource class which can be found in the System.Threading namespace. The Token property of this class returns a CancellationToken object that can be used by the TPL and the Task body to monitor for cancellation. The second step is to create a Task object using the result of the CancellationToken.Token property as a constructor argument. Listing 24-11 uses the StartNew method to create and start the Task in a single statement; the first parameter is the lambda expression containing the Task body, and the second parameter is the result of the Token property. The Task body has to cooperate with the cancellation, which it does by checking the IsCancellationRequested property of the CancellationToken obtained through the Token property of the CancellationToken source, like this:

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if (cancelTS.Token.IsCancellationRequested) {

try { ... } catch (SQLException sqle) { for(Throwable t : sqle) { System.out.println("Throwable: " + t); } }

If the IsCancellationRequested property returns true, the Task should release any resources it is holding and throw an OperationCanceledException exception, created by passing the CancellationToken as a constructor parameter, like this:

throw new OperationCanceledException(cancelTS.Token);