/// <summary>
/// Initializes a new instance of the <see cref="IxSingletonInstance"/> class.
/// </summary>
/// <param name="providerNode">Singleton provider.</param>
/// <param name="parentInstance">Parent instance.</param>
/// <param name="context">The resolve context.</param>
/// <param name="frame">The resolution frame in the resolve sequence.</param>
/// <param name="creatorTempLock">First temp lock for the creator of a new instance.</param>
public IxSingletonInstance(
IxSingletonProvider providerNode,
IIxInstance parentInstance,
IxHost.IxResolveContext context,
[CanBeNull] IxResolveFrame frame,
out IIxInstanceLock creatorTempLock)
: base(providerNode, parentInstance, out creatorTempLock)
{
if (parentInstance == null)
{
throw new ArgumentNullException(nameof(parentInstance));
}
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
Debug.Assert(ProviderNode.InstanceFactory != null, "IxSingletonProvider always have instance factory.");
var newFrame = new IxResolveFrame(frame, this);
SetObjectCreationTask(
ProviderNode.InstanceFactory.Factory(
this,
parentInstance,
context,
newFrame));
}
private async ValueTask <IIxInstanceLock> Resolve(
IIxInstance originInstance,
IxIdentifier identifier,
IxResolveContext context,
[CanBeNull] IxResolveFrame frame)
{
if (originInstance == null)
{
throw new ArgumentNullException(nameof(originInstance));
}
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (originInstance.ProviderNode.Host != this)
{
throw new InvalidOperationException("You cannot use resolver from different host.");
}
////if (context.IsFailed)
////{
//// throw new InvalidOperationException("You cannot do anything inside failed resolve context.");
////}
return(await ResolveHandler.Delegate(originInstance, identifier, context, frame));
}
public IxResolver(
IxHost host,
IIxInstance ownerInstance,
[CanBeNull] IxResolveContext parentContext,
[CanBeNull] IxResolveFrame parentFrame)
{
if (host == null)
{
throw new ArgumentNullException(nameof(host));
}
if (ownerInstance == null)
{
throw new ArgumentNullException(nameof(ownerInstance));
}
if (parentFrame != null)
{
if (parentContext == null)
{
throw new ArgumentNullException();
}
}
Host = host;
OwnerInstance = ownerInstance;
ParentFrame = parentFrame;
ParentContext = parentContext;
}
public IxResolveFrame(
[CanBeNull] IxResolveFrame parentFrame,
IIxInstance instance)
{
ParentFrame = parentFrame;
Instance = instance;
}
#pragma warning disable CS1998 // Async method lacks 'await' operators and will run synchronously
/// <inheritdoc/>
public override async ValueTask <IIxInstanceLock> GetInstance(
IIxInstance parentInstance,
IxIdentifier identifier,
IxHost.IxResolveContext context,
[CanBeNull] IxResolveFrame frame)
{
if (parentInstance == null)
{
throw new ArgumentNullException(nameof(parentInstance));
}
lock (Host.InstanceTreeSyncRoot)
{
IIxInstanceLock scopeLock;
IxScopeInstance singleton;
object data = parentInstance.GetData(this);
if (data == null)
{
singleton = new IxScopeInstance(this, parentInstance, out scopeLock);
parentInstance.SetData(this, singleton);
}
else
{
singleton = (IxScopeInstance)data;
scopeLock = new IxInstancePinLock(singleton);
}
return(scopeLock);
}
}
/// <summary>
/// Resolves list of <c>dependencies</c> from the specified origin. TODO: Implement <c>this</c> method with parallel
/// resolution.
/// </summary>
/// <typeparam name="TResult">Target operation result type.</typeparam>
/// <param name="originInstance">Origin instance. Where <c>dependencies</c> are queried.</param>
/// <param name="dependencies">List of dependency identifiers.</param>
/// <param name="context">Resolve <c>context</c>.</param>
/// <param name="frame">The resolve sequence frame.</param>
/// <param name="targetOperation">Operation that should be performed with resolved <c>dependencies</c>.</param>
/// <returns>Result of target opration.</returns>
public async ValueTask <TResult> ResolveList <TResult>(
IIxInstance originInstance,
HashSet <IxIdentifier> dependencies,
IxResolveContext context,
[CanBeNull] IxResolveFrame frame,
Func <Dictionary <IxIdentifier, IIxInstance>, ValueTask <TResult> > targetOperation)
{
if (originInstance == null)
{
throw new ArgumentNullException(nameof(originInstance));
}
if (dependencies == null)
{
throw new ArgumentNullException(nameof(dependencies));
}
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (targetOperation == null)
{
throw new ArgumentNullException(nameof(targetOperation));
}
using (HashSet <IxIdentifier> .Enumerator enumerator = dependencies.GetEnumerator())
{
var result = new Dictionary <IxIdentifier, IIxInstance>();
async ValueTask <TResult> ResolveItem()
{
// ReSharper disable once AccessToDisposedClosure
if (!enumerator.MoveNext())
{
return(await targetOperation(result));
}
// ReSharper disable once AccessToDisposedClosure
IxIdentifier identifier = enumerator.Current;
using (IIxInstanceLock instanceLock = await Resolve(originInstance, identifier, context, frame))
{
result.Add(identifier, instanceLock.Target);
TResult resultItem = await ResolveItem();
if (identifier.Type == typeof(IIxResolver))
{
(instanceLock.Target as IxResolver)?.ClearParentResolveContext();
}
return(resultItem);
}
}
return(await ResolveItem());
}
}
public override ValueTask <IIxInstanceLock> GetInstance(
IIxInstance parentInstance,
IxIdentifier identifier,
IxHost.IxResolveContext context,
[CanBeNull] IxResolveFrame frame)
{
throw new NotImplementedException();
}
/// <inheritdoc/>
public override async ValueTask <IIxInstanceLock> GetInstance(
IIxInstance parentInstance,
IxIdentifier identifier,
IxHost.IxResolveContext context,
[CanBeNull] IxResolveFrame frame)
{
Critical.Assert(false, "Not supported.");
return(null);
}
/// <inheritdoc/>
public override async ValueTask <IIxInstanceLock> GetInstance(
IIxInstance parentInstance,
IxIdentifier identifier,
IxHost.IxResolveContext context,
[CanBeNull] IxResolveFrame frame)
{
if (parentInstance == null)
{
throw new ArgumentNullException(nameof(parentInstance));
}
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
IIxInstanceLock creatorLock = null;
IxSingletonInstance instance;
// Re-implement this with more advanced Half-Instantiation with loop detection.
lock (Host.InstanceTreeSyncRoot)
{
instance = parentInstance.GetData(this) as IxSingletonInstance;
if (instance == null)
{
// TODO: Detect cycles.
Debug.Assert(InstanceFactory != null, "InstanceFactory != null");
instance = new IxSingletonInstance(this, parentInstance, context, frame, out creatorLock);
parentInstance.SetData(this, instance);
}
}
try
{
await instance.ObjectCreationTask;
return(creatorLock ?? new IxInstancePinLock(instance));
}
catch
{
if (creatorLock != null)
{
lock (Host.InstanceTreeSyncRoot)
{
parentInstance.SetData(this, null);
}
creatorLock.Dispose();
}
throw;
}
}
private async ValueTask <IIxInstanceLock> RegistrationScopeBinder(
IIxInstance originInstance,
IxResolvePath resolvePath,
IxResolveContext context,
[CanBeNull] IxResolveFrame frame,
IxResolveBoundDelegate resolveBound)
{
IIxInstance curInstance = originInstance;
Critical.Assert(resolvePath.Path.Any(), "Registration scope binder does not support empty path.");
lock (InstanceTreeSyncRoot)
{
while (curInstance != null)
{
if (curInstance.ProviderNode == resolvePath.Root)
{
break;
}
curInstance = curInstance.ParentInstance;
}
}
if (curInstance == null)
{
throw new InvalidOperationException("Resolve algorithms problems");
}
Func <IIxInstance, int, ValueTask <IIxInstanceLock> > resolvePathElements = null;
resolvePathElements = async(parentInstance, index) =>
{
if (index < resolvePath.Path.Count - 1)
{
using (IIxInstanceLock instanceLock = await Resolve(
parentInstance,
resolvePath.Path[index].Identifier,
context,
frame))
{
return(await resolvePathElements(instanceLock.Target, index + 1));
}
}
return(await resolveBound(parentInstance, resolvePath.Path.Last(), context));
};
IIxInstanceLock resultInstanceLock = await resolvePathElements(curInstance, 0);
return(resultInstanceLock);
}
public abstract ValueTask <IIxInstanceLock> GetInstance(
IIxInstance parentInstance,
IxIdentifier identifier,
IxHost.IxResolveContext context,
[CanBeNull] IxResolveFrame frame);
