public void ParametersProperty() {
// Act
AsyncManager helper = new AsyncManager();
// Assert
Assert.IsNotNull(helper.Parameters);
}
public void OutstandingOperationsProperty() {
// Act
AsyncManager helper = new AsyncManager();
// Assert
Assert.IsNotNull(helper.OutstandingOperations);
}
public void Post() {
// Arrange
Mock<SynchronizationContext> mockSyncContext = new Mock<SynchronizationContext>();
mockSyncContext
.Expect(c => c.Send(It.IsAny<SendOrPostCallback>(), null))
.Callback(
delegate(SendOrPostCallback d, object state) {
d(state);
});
AsyncManager helper = new AsyncManager(mockSyncContext.Object);
bool wasCalled = false;
// Act
helper.Post(() => { wasCalled = true; });
// Assert
Assert.IsTrue(wasCalled);
}
public static void RegisterTask(this AsyncManager asyncManager, Func <AsyncCallback, IAsyncResult> beginDelegate, Action <IAsyncResult> endDelegate)
{
if (asyncManager == null)
{
throw new ArgumentNullException("asyncManager");
}
if (beginDelegate == null)
{
throw new ArgumentNullException("beginDelegate");
}
if (endDelegate == null)
{
throw new ArgumentNullException("endDelegate");
}
// need to wait to execute the callback until after BeginXxx() has completed
object delegateExecutingLockObj = new object();
AsyncCallback callback = ar =>
{
lock (delegateExecutingLockObj)
{
// this empty lock is required to synchronized with the beginDelegate call
}
if (!ar.CompletedSynchronously)
{
try
{
asyncManager.Sync(() => endDelegate(ar)); // called on different thread, so have to take application lock
}
catch
{
// Need to swallow exceptions, as otherwise unhandled exceptions on a ThreadPool thread
// can bring down the entire worker process.
}
finally
{
asyncManager.OutstandingOperations.Decrement();
}
}
};
IAsyncResult asyncResult;
asyncManager.OutstandingOperations.Increment();
try
{
lock (delegateExecutingLockObj)
{
asyncResult = beginDelegate(callback);
}
}
catch
{
asyncManager.OutstandingOperations.Decrement();
throw;
}
if (asyncResult.CompletedSynchronously)
{
try
{
endDelegate(asyncResult); // call on same thread
}
finally
{
asyncManager.OutstandingOperations.Decrement();
}
}
}
public void TimeoutPropertyThrowsIfDurationIsOutOfRangs() {
// Arrange
int timeout = -30;
AsyncManager helper = new AsyncManager();
// Act & assert
ExceptionHelper.ExpectArgumentOutOfRangeException(
delegate {
helper.Timeout = timeout;
}, "value",
@"The timeout period must be a non-negative number or Timeout.Infinite.
Parameter name: value");
}
public void TimeoutProperty() {
// Arrange
int setValue = 50;
AsyncManager helper = new AsyncManager();
// Act
int defaultTimeout = helper.Timeout;
helper.Timeout = setValue;
int newTimeout = helper.Timeout;
// Assert
Assert.AreEqual(30000, defaultTimeout);
Assert.AreEqual(setValue, newTimeout);
}
public void SynchronizationContextProperty() {
// Arrange
SynchronizationContext syncContext = new SynchronizationContext();
// Act
AsyncManager helper = new AsyncManager(syncContext);
// Assert
Assert.AreEqual(syncContext, helper.SynchronizationContext);
}
public override IAsyncResult BeginExecute(ControllerContext controllerContext, IDictionary <string, object> parameters, AsyncCallback callback, object state)
{
if (controllerContext == null)
{
throw new ArgumentNullException("controllerContext");
}
if (parameters == null)
{
throw new ArgumentNullException("parameters");
}
AsyncManager asyncHelper = GetAsyncManager(controllerContext.Controller);
SingleFireEvent setupCompletedEvent = new SingleFireEvent();
BeginInvokeCallback beginCallback = (innerCallback, innerState) => {
ManualAsyncResult asyncResult = new ManualAsyncResult()
{
AsyncState = innerState
};
// Get parameters for async setup method, then execute
ParameterInfo[] setupParametersInfos = SetupMethod.GetParameters();
var rawSetupParameterValues = from parameterInfo in setupParametersInfos
select ExtractParameterFromDictionary(parameterInfo, parameters, SetupMethod);
object[] setupParametersArray = rawSetupParameterValues.ToArray();
// to simplify the logic, force an asynchronous callback
asyncHelper.OutstandingOperations.Completed += delegate {
if (setupCompletedEvent.Signal())
{
ThreadPool.QueueUserWorkItem(o => {
asyncResult.MarkCompleted(false /* completedSynchronously */, innerCallback);
});
}
};
MethodDispatcher setupDispatcher = DispatcherCache.GetDispatcher(SetupMethod);
asyncHelper.OutstandingOperations.Increment();
setupDispatcher.Execute(controllerContext.Controller, setupParametersArray);
asyncHelper.OutstandingOperations.Decrement();
return(asyncResult);
};
AsyncCallback <object> endCallback = ar => {
if (setupCompletedEvent.Signal())
{
// the setup method did not complete before this callback executed
throw new InvalidOperationException(MvcResources.AsyncActionDescriptor_EndExecuteCalledPrematurely);
}
// Get parameters for action method, then execute
ParameterInfo[] completionParametersInfos = CompletionMethod.GetParameters();
var rawCompletionParameterValues = from parameterInfo in completionParametersInfos
select ExtractParameterOrDefaultFromDictionary(parameterInfo, asyncHelper.Parameters);
object[] completionParametersArray = rawCompletionParameterValues.ToArray();
MethodDispatcher completionDispatcher = DispatcherCache.GetDispatcher(CompletionMethod);
object actionReturnValue = completionDispatcher.Execute(controllerContext.Controller, completionParametersArray);
return(actionReturnValue);
};
// Set the timeout and go
int timeout = asyncHelper.Timeout;
return(AsyncResultWrapper.WrapWithTimeout(callback, state, beginCallback, endCallback, timeout, _executeTag));
}
