private async Task WaitForCompletion(CollectionRuleContext context,
Action startCallback,
IDictionary <string, CollectionRuleActionResult> allResults,
ActionCompletionEntry entry,
CancellationToken cancellationToken)
{
try
{
await WaitForCompletion(context, startCallback, allResults, entry.Action, entry.Options, cancellationToken);
}
catch (Exception ex) when(ShouldHandleException(ex, context.Name, entry.Options.Type))
{
throw new CollectionRuleActionExecutionException(ex, entry.Options.Type, entry.Index);
}
finally
{
await DisposableHelper.DisposeAsync(entry.Action);
}
}
private async Task WaitForCompletion(CollectionRuleContext context,
Action startCallback,
IDictionary <string, CollectionRuleActionResult> allResults,
ICollectionRuleAction action,
CollectionRuleActionOptions actionOption,
CancellationToken cancellationToken)
{
//Before we wait for any other action to complete, we signal that execution has started.
//This allows process resume to occur.
startCallback?.Invoke();
CollectionRuleActionResult results = await action.WaitForCompletionAsync(cancellationToken);
if (!string.IsNullOrEmpty(actionOption.Name))
{
allResults.Add(actionOption.Name, results);
}
_logger.CollectionRuleActionCompleted(context.Name, actionOption.Type);
}
//CONSIDER Only named rules currently return results since only named results can be referenced
public async Task <IDictionary <string, CollectionRuleActionResult> > ExecuteActions(
CollectionRuleContext context,
Action startCallback,
CancellationToken cancellationToken)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
bool started = false;
Action wrappedStartCallback = () =>
{
if (!started)
{
started = true;
startCallback?.Invoke();
}
};
int actionIndex = 0;
List <ActionCompletionEntry> deferredCompletions = new(context.Options.Actions.Count);
var actionResults = new Dictionary <string, CollectionRuleActionResult>(StringComparer.Ordinal);
var dependencyAnalyzer = ActionOptionsDependencyAnalyzer.Create(context);
try
{
// Start and optionally wait for each action to complete
foreach (CollectionRuleActionOptions actionOption in context.Options.Actions)
{
KeyValueLogScope actionScope = new();
actionScope.AddCollectionRuleAction(actionOption.Type, actionIndex);
using IDisposable actionScopeRegistration = _logger.BeginScope(actionScope);
_logger.CollectionRuleActionStarted(context.Name, actionOption.Type);
try
{
IList <CollectionRuleActionOptions> actionDependencies = dependencyAnalyzer.GetActionDependencies(actionIndex);
foreach (CollectionRuleActionOptions actionDependency in actionDependencies)
{
for (int i = 0; i < deferredCompletions.Count; i++)
{
ActionCompletionEntry deferredCompletion = deferredCompletions[i];
if (string.Equals(deferredCompletion.Options.Name, actionDependency.Name, StringComparison.Ordinal))
{
deferredCompletions.RemoveAt(i);
i--;
await WaitForCompletion(context, wrappedStartCallback, actionResults, deferredCompletion, cancellationToken);
break;
}
}
}
ICollectionRuleActionFactoryProxy factory;
if (!_actionOperations.TryCreateFactory(actionOption.Type, out factory))
{
throw new InvalidOperationException(Strings.ErrorMessage_CouldNotMapToAction);
}
object newSettings = dependencyAnalyzer.SubstituteOptionValues(actionResults, actionIndex, actionOption.Settings);
ICollectionRuleAction action = factory.Create(context.EndpointInfo, newSettings);
try
{
await action.StartAsync(cancellationToken);
// Check if the action completion should be awaited synchronously (in respect to
// starting the next action). If not, add a deferred entry so that it can be completed
// after starting each action in the list.
if (actionOption.WaitForCompletion.GetValueOrDefault(CollectionRuleActionOptionsDefaults.WaitForCompletion))
{
await WaitForCompletion(context, wrappedStartCallback, actionResults, action, actionOption, cancellationToken);
}
else
{
deferredCompletions.Add(new(action, actionOption, actionIndex));
// Set to null to skip disposal
action = null;
}
}
finally
{
await DisposableHelper.DisposeAsync(action);
}
}
catch (Exception ex) when(ShouldHandleException(ex, context.Name, actionOption.Type))
{
throw new CollectionRuleActionExecutionException(ex, actionOption.Type, actionIndex);
}
++actionIndex;
}
// Notify that all actions have started
wrappedStartCallback?.Invoke();
// Wait for any actions whose completion has been deferred.
while (deferredCompletions.Count > 0)
{
ActionCompletionEntry deferredCompletion = deferredCompletions[0];
deferredCompletions.RemoveAt(0);
await WaitForCompletion(context, wrappedStartCallback, actionResults, deferredCompletion, cancellationToken);
}
return(actionResults);
}
finally
{
// Always dispose any deferred action completions so that those actions
// are stopped before leaving the action list executor.
foreach (ActionCompletionEntry deferredCompletion in deferredCompletions)
{
await DisposableHelper.DisposeAsync(deferredCompletion.Action);
}
}
}