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;
}
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));
}
/// <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());
}
}
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 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));
}
}
public IxResolveContext(
IIxInstance originInstance,
[CanBeNull] IxResolveContext parentContext,
IReadOnlyDictionary <IxIdentifier, object> arguments)
{
Critical.CheckedAssert(originInstance != null, "Origin instance should be null.");
Critical.CheckedAssert(arguments != null, "Arguments dictionary should not be null.");
Arguments = arguments;
_originInstance = originInstance;
ParentContext = parentContext;
_rootContext = parentContext?._rootContext ?? this;
Critical.CheckedAssert(_rootContext != null, "Root context should not be null.");
}
/// <summary>
/// Second initialization phase.
/// </summary>
/// <param name="config">Host configuration.</param>
/// <returns>Async execution TPL task.</returns>
public async Task Initialize(IIxHostConfig config)
{
var allConfigNodes = new HashSet <IIxProviderNodeConfig>();
config.Nodes.Add(
new IxStdProviderConfig
{
Identifier = new IxIdentifier(typeof(IIxHost)),
InstanceBuilder = new IxExistingInstanceFactoryConfig <IIxHost>(this),
DisposeHandler = obj => TaskEx.CompletedTask
});
Action <IIxProviderNodeConfig, IxProviderNode> buildNodeAction = null;
buildNodeAction = (nodeConfig, parentNode) =>
{
if (!allConfigNodes.Add(nodeConfig))
{
throw new InvalidOperationException(
"Configuration contains the same object multiple times. Currently it's not allowed to avoid visitor cycles.");
}
IxProviderNode node = ProviderNodeBuilder.Delegate(nodeConfig, parentNode);
// parent node is null only for root scope.
if (parentNode == null)
{
_rootScope = (IxScope)node;
}
foreach (IIxProviderNodeConfig childConfig in nodeConfig.Nodes)
{
buildNodeAction(childConfig, node);
}
};
buildNodeAction(config, null);
Action <IxProviderNode> importRegistrationsFromChildren = null;
importRegistrationsFromChildren = node =>
{
foreach (IxProviderNode child in node.Nodes)
{
importRegistrationsFromChildren(child);
// Applying export to parent filter
// while Blocking from exporting resolve pathes with zero-length.
foreach (KeyValuePair <IxIdentifier, IxResolvePath> kvp in
child.VisibleNodes.Where(
x => child.ExportToParentFilter(x.Key) &&
x.Value.Path.Any()))
{
if (node.VisibleNodes.ContainsKey(kvp.Key))
{
throw new InvalidOperationException("Export to parent node conflict.");
}
node.VisibleNodes.Add(kvp.Key, kvp.Value.ReRoot(node));
}
}
};
importRegistrationsFromChildren(_rootScope);
Action <IxProviderNode> exportRegistrationsToChildren = null;
exportRegistrationsToChildren = node =>
{
KeyValuePair <IxIdentifier, IxResolvePath>[] registrationsToExport =
node.VisibleNodes.Where(x => node.ExportFilter(x.Key)).ToArray();
if (!registrationsToExport.Any())
{
return;
}
foreach (IxProviderNode child in node.Nodes)
{
foreach (KeyValuePair <IxIdentifier, IxResolvePath> kvp in
registrationsToExport.Where(x => child.ImportFilter(x.Key)))
{
IxResolvePath resolvePath;
if (child.VisibleNodes.TryGetValue(kvp.Key, out resolvePath))
{
// Skipping self to children.
if (resolvePath.Path.Any())
{
// Direct cycle resolution replacement.
if (!resolvePath.Target.ParentReplacementNodes.ContainsKey(kvp.Key))
{
resolvePath.Target.ParentReplacementNodes.Add(kvp.Key, kvp.Value);
}
}
}
else
{
child.VisibleNodes.Add(kvp.Key, kvp.Value);
}
}
exportRegistrationsToChildren(child);
}
};
exportRegistrationsToChildren(_rootScope);
_rootScopeInstance = _rootScope.GetRootInstance();
var resolveContext = new IxResolveContext(_rootScopeInstance, null, new Dictionary <IxIdentifier, object>());
using (IIxInstanceLock rootResolverLock = await Resolve(
_rootScopeInstance,
new IxIdentifier(typeof(IIxResolver)),
resolveContext,
null))
{
var resolver = (IxResolver)rootResolverLock.Target.Object;
Critical.CheckedAssert(
resolver.ParentContext == null && resolver.ParentFrame == null,
"After resolve finished, resolver should not be bound to any context.");
Resolver = resolver;
}
}
public void ClearParentResolveContext()
{
ParentFrame = null;
ParentContext = null;
}
