private void SaveState(IAsyncStateMachine stateMachine)
{
using (var stream = new MemoryStream())
{
stateMachine.SaveTo(stream);
savedState = stream.ToArray();
}
}
public IAwaitable Setup()
{
var awaiter = new YieldingAwaiter(continuation =>
{
stateMachine = AsyncUtil.GetStateMachine(continuation);
machineContinuation = continuation;
if (savedState == null)
{
SaveState(stateMachine);
}
else
{
stateMachine.LoadFrom(new MemoryStream(savedState));
}
});
return awaiter.NewAwaitable();
}
public void SetStateMachine(IAsyncStateMachine stateMachine)
{
}
//przekazanie referencji do siebie samej: case heap vs stack
public void SetStateMachine(IAsyncStateMachine stateMachine)
{
//tutaj znajdujemy się w momencie ewakuacji
}
void IAsyncStateMachine.SetStateMachine(IAsyncStateMachine stateMachine)
{
this.builder.SetStateMachine(stateMachine);
}
public void SetStateMachine(IAsyncStateMachine stateMachine)
{
this.m_coreState.SetStateMachine(stateMachine);
}
public AwaiterSerializableCallback(Action continuation, IAsyncStateMachine stateMachine, string awaiterResultType, bool isUiThread, IAsyncOperation asyncOperation)
{
IsUiThread = isUiThread;
AwaiterResultType = awaiterResultType;
Initialize(continuation, stateMachine, asyncOperation);
}
void IAsyncStateMachineAware.SetStateMachine(IAsyncStateMachine stateMachine)
{
_stateMachine = stateMachine;
}
public void SetStateMachine(IAsyncStateMachine stateMachine)
{
//set state machine
}
public void SetStateMachine(IAsyncStateMachine stateMachine)
{
// Method is not implemented as it is not needed for our purpose.
throw new NotImplementedException();
}
public void SetStateMachine(IAsyncStateMachine stateMachine)
{
// Should not get called as we don't implement the optimization that this method is used for.
throw new NotImplementedException();
}
/// <summary>
/// Associates the builder with the specified state machine.
/// </summary>
/// <param name="stateMachine"></param>
public void SetStateMachine(IAsyncStateMachine stateMachine)
{
Debug.WriteLine($"AsyncTaskMethodBuilder:SetStateMachine");
}
private static FieldInfo BuilderField(this IAsyncStateMachine sm) => sm.GetType().GetField("<>t__builder") ?? sm.GetType().GetField("$Builder");
public void SetStateMachine(IAsyncStateMachine stateMachine) => SetStateMachineDelegate?.Invoke(stateMachine);
void IAsyncStateMachine.SetStateMachine(IAsyncStateMachine stateMachine)
{
/* Данный метод не играет важной роли в этом примере. */
throw new NotImplementedException();
}
void IAsyncStateMachine.SetStateMachine(IAsyncStateMachine stateMachine)
{
throw new NotImplementedException();
}
/// <summary>Associates the builder with the specified state machine.</summary> /// <param name="stateMachine">The state machine instance to associate with the builder.</param> public void SetStateMachine(IAsyncStateMachine stateMachine) => AsyncMethodBuilderCore.SetStateMachine(stateMachine, task: null);
public void SetStateMachine(IAsyncStateMachine stateMachine)
{
_asyncStateMachine = stateMachine;
}
public void SetStateMachine(IAsyncStateMachine stateMachine)
{
this.asyncStateMachineImplementation.SetStateMachine(stateMachine);
}
void IAsyncStateMachine.SetStateMachine(IAsyncStateMachine stateMachine)
{
}
public void SetStateMachine(IAsyncStateMachine stateMachine)
{
Log();
methodBuilder.SetStateMachine(stateMachine);
}
public extern void SetStateMachine(IAsyncStateMachine stateMachine);
public void SetStateMachine(IAsyncStateMachine stateMachine)
{
throw new NotImplementedException();
}
private void InvokeInternal(IOperationResult result)
{
if (StateMachineType == null || FieldSnapshots == null)
{
Tracer.Error("The await callback cannot be executed empty serialization state property " +
(StateMachineType == null ? "StateMachineType" : "FieldSnapshots"));
return;
}
var type = Type.GetType(StateMachineType, true);
IAsyncStateMachine stateMachine = null;
#if WINDOWSCOMMON || XAMARIN_FORMS
if (type.GetTypeInfo().IsValueType)
#else
if (type.IsValueType)
#endif
{
try
{
#if WINDOWSCOMMON
stateMachine = (IAsyncStateMachine)Activator.CreateInstance(type);
#else
stateMachine = (IAsyncStateMachine)GetDefault(type);
#endif
}
catch
{
;
}
}
else
{
try
{
var constructor = type.GetConstructor(Empty.Array <Type>());
if (constructor != null)
{
stateMachine = (IAsyncStateMachine)constructor.InvokeEx();
}
}
catch
{
;
}
}
if (stateMachine == null)
{
Exception e = null;
try
{
#if WINDOWSCOMMON
if (type.GetTypeInfo().IsValueType)
{
stateMachine = (IAsyncStateMachine)GetDefault(type);
}
else
{
stateMachine = (IAsyncStateMachine)Activator.CreateInstance(type);
}
#else
stateMachine = (IAsyncStateMachine)Activator.CreateInstance(type);
#endif
}
catch (Exception ex)
{
e = ex;
}
if (e != null)
{
Tracer.Error("The await callback cannot be executed missing constructor, state machine " + type +
" " + e.Flatten(true));
return;
}
}
var viewModels = CollectViewModels(result);
var items = new Dictionary <Type, object>();
if (result.Source != null)
{
items[result.Source.GetType()] = result.Source;
}
//we need to sort fields, to restore builder as last operation.
FieldSnapshots.Sort((x1, x2) => x1.FieldType.CompareTo(x2.FieldType));
for (int index = 0; index < FieldSnapshots.Count; index++)
{
var fieldSnapshot = FieldSnapshots[index];
if (!fieldSnapshot.Restore(type, stateMachine, items, viewModels, AwaiterResultType, result))
{
object fieldInfo = (object)type.GetFieldEx(fieldSnapshot.Name,
MemberFlags.NonPublic | MemberFlags.Public | MemberFlags.Instance) ?? fieldSnapshot.Name;
Tracer.Error("The await callback cannot be executed, field ({0}) cannot be restored source {1}", fieldInfo, result.Source);
break;
}
}
}
private void SetStateMachine(IAsyncStateMachine stateMachine)
{
}
/// <summary>Associates the builder with the state machine it represents.</summary>
/// <param name="stateMachine">The heap-allocated state machine object.</param>
/// <exception cref="System.ArgumentNullException">The <paramref name="stateMachine"/> argument was null (Nothing in Visual Basic).</exception>
/// <exception cref="System.InvalidOperationException">The builder is incorrectly initialized.</exception>
public void SetStateMachine(IAsyncStateMachine stateMachine)
{
AsyncMethodBuilderCore.SetStateMachine(stateMachine, m_moveNextAction); // argument validation handled by AsyncMethodBuilderCore
}
void IAsyncStateMachine.SetStateMachine(IAsyncStateMachine stateMachine)
{
//ILSpy generated this explicit interface implementation from .override directive in SetStateMachine
this.SetStateMachine(stateMachine);
}
public void SetStateMachine(IAsyncStateMachine _) => Counters.SetStateMachine.Increment();
private AsyncTaskMethodBuilder(Task <TResult> task)
{
this.task = task;
this.stateMachine = null;
}
/// <summary>
/// This is the core to find the continuation delegate(s) inside the given async state machine.
/// The chain of objects is like this: async state machine -> async method builder -> task -> continuation object -> action.
/// </summary>
/// <remarks>
/// There are 3 types of "async method builder": AsyncVoidMethodBuilder, AsyncTaskMethodBuilder, AsyncTaskMethodBuilder<T>.
/// We don't cover AsyncVoidMethodBuilder as it is used rarely and it can't be awaited either;
/// AsyncTaskMethodBuilder is a wrapper on top of AsyncTaskMethodBuilder<VoidTaskResult>.
/// </remarks>
private static IEnumerable <Delegate> FindContinuationDelegates(IAsyncStateMachine stateMachine)
{
Requires.NotNull(stateMachine, nameof(stateMachine));
var builder = GetStateMachineFieldValueOnSuffix(stateMachine, "__builder");
if (builder == null)
{
yield break;
}
var task = GetFieldValue(builder, "m_task");
if (task == null)
{
// Probably this builder is an instance of "AsyncTaskMethodBuilder", so we need to get its inner "AsyncTaskMethodBuilder<VoidTaskResult>"
builder = GetFieldValue(builder, "m_builder");
if (builder != null)
{
task = GetFieldValue(builder, "m_task");
}
}
if (task == null)
{
yield break;
}
// "task" might be an instance of the type deriving from "Task", but "m_continuationObject" is a private field in "Task",
// so we need to use "typeof(Task)" to access "m_continuationObject".
var continuationField = typeof(Task).GetTypeInfo().GetDeclaredField("m_continuationObject");
if (continuationField == null)
{
yield break;
}
var continuationObject = continuationField.GetValue(task);
if (continuationObject == null)
{
yield break;
}
if (continuationObject is IEnumerable items)
{
foreach (var item in items)
{
var action = item as Delegate ?? GetFieldValue(item, "m_action") as Delegate;
if (action != null)
{
yield return(action);
}
}
}
else
{
var action = continuationObject as Delegate ?? GetFieldValue(continuationObject, "m_action") as Delegate;
if (action != null)
{
yield return(action);
}
}
}
public void SetStateMachine(IAsyncStateMachine stateMachine)
{
builder.SetStateMachine(stateMachine);
}
/// <summary>
/// Set the state machine.
/// </summary>
/// <param name="stateMachine">State machine.</param>
public void SetStateMachine(IAsyncStateMachine stateMachine)
{
}
private void SetStateMachine(IAsyncStateMachine stateMachine)
{
this.asyncTaskMethodBuilder_0.SetStateMachine(stateMachine);
}
public void SetStateMachine(IAsyncStateMachine stateMachine)
{
mb.SetStateMachine(stateMachine);
}
_methodBuilder.Start(ref stateMachine); // will provide the right ExecutionContext semantics
/// <summary>Associates the builder with the specified state machine.</summary>
/// <param name="stateMachine">The state machine instance to associate with the builder.</param>
public void SetStateMachine(IAsyncStateMachine stateMachine) => _methodBuilder.SetStateMachine(stateMachine);
void IAsyncStateMachine.SetStateMachine(IAsyncStateMachine machine)
{
builder.SetStateMachine(machine);
}
private AsyncVoidMethodBuilder(SynchronizationContext context)
{
this.context = context;
this.stateMachine = null;
}
void IAsyncStateMachine.SetStateMachine(IAsyncStateMachine machine)
{
builder.SetStateMachine(machine);
}
void IAsyncStateMachine.SetStateMachine(IAsyncStateMachine param0)
{
this.builder.SetStateMachine(param0);
}
