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));
}
#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);
}
/// <summary>
/// Initializes a new instance of the <see cref="IxResolveTargetNotFound"/> class with a specified error message and inner
/// exception.
/// </summary>
/// <param name="message">The message that describes the error. </param>
/// <param name="identifier">Resolve target identifier.</param>
/// <param name="innerException">Inner error.</param>
public IxResolveTargetNotFound(string message, IxIdentifier identifier, Exception innerException)
: base(message, innerException)
{
if (identifier == default(IxIdentifier))
{
throw new ArgumentException("Identifier should not be empty.", nameof(identifier));
}
Identifier = identifier;
}
/// <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;
}
}
public async ValueTask <IIxInstanceLock> Resolve(
IxIdentifier identifier,
IReadOnlyDictionary <IxIdentifier, object> arguments = null)
{
var context = new IxResolveContext(
OwnerInstance,
ParentContext,
arguments ?? new Dictionary <IxIdentifier, object>());
using (new IxInstancePinLock(OwnerInstance))
{
return(await Host.Resolve(OwnerInstance, identifier, context, ParentFrame));
}
}
/// <summary>
/// Tries to get argument value for the provided identifier.
/// </summary>
/// <param name="identifier">Argument identifier.</param>
/// <param name="context">The resolve context.</param>
/// <returns>Argument instance lock or null, if no argument found for the provided identifier.</returns>
public IIxInstanceLock TryGetInstance(IxIdentifier identifier, IxHost.IxResolveContext context)
{
IxHost.IxResolveContext curContext = context;
while (curContext != null)
{
if (context.Arguments.TryGetValue(identifier, out var result))
{
return(new IxInstancePinLock(new IxArgumentInstance(this, result)));
}
curContext = context.ParentContext;
}
// ReSharper disable once AssignNullToNotNullAttribute
return(null);
}
public abstract ValueTask <IIxInstanceLock> GetInstance(
IIxInstance parentInstance,
IxIdentifier identifier,
IxHost.IxResolveContext context,
[CanBeNull] IxResolveFrame frame);