private CompositionResult TrySatisfyImports(ComposablePart part, bool shouldTrackImports)
{
Assumes.NotNull(part);
var result = CompositionResult.SucceededResult;
PartManager partManager = GetPartManager(part);
var originalState = partManager.State;
// Track number of recursive iterations and throw an exception before the stack
// fills up and debugging the root cause becomes tricky
if (this._recursionStateStack.Count >= MaximumNumberOfCompositionIterations)
{
return(result.MergeError(
ErrorBuilder.ComposeTookTooManyIterations(MaximumNumberOfCompositionIterations)));
}
// Maintain the stack to detect whether recursive loops cross prerequisites
this._recursionStateStack.Push(partManager);
try
{
result = result.MergeResult(
TrySatisfyImportsStateMachine(partManager, part));
}
finally
{
this._recursionStateStack.Pop();
}
if (shouldTrackImports)
{
StartSatisfyingImports(partManager, null);
}
return(result);
}
private CompositionResult TrySatisfyImports(PartManager partManager, ComposablePart part, bool shouldTrackImports)
{
if (part == null)
{
throw new ArgumentNullException(nameof(part));
}
var result = CompositionResult.SucceededResult;
// get out if the part is already composed
if (partManager.State == ImportState.Composed)
{
return(result);
}
// Track number of recursive iterations and throw an exception before the stack
// fills up and debugging the root cause becomes tricky
if (_recursionStateStack.Count >= MaximumNumberOfCompositionIterations)
{
return(result.MergeError(
ErrorBuilder.ComposeTookTooManyIterations(MaximumNumberOfCompositionIterations)));
}
// Maintain the stack to detect whether recursive loops cross prerequisites
_recursionStateStack.Push(partManager);
try
{
result = result.MergeResult(
TrySatisfyImportsStateMachine(partManager, part));
}
finally
{
_recursionStateStack.Pop();
}
if (shouldTrackImports)
{
StartSatisfyingImports(partManager, null);
}
return(result);
}
