private Task <T> ExecuteWithinLockAsync <T>(Func <Task <T> > task)
{
return(_gate.ExecuteWithinLockAsync(JoinableCollection, JoinableFactory, task));
}
private async Task UpdateProjectContextAndSubscriptionsAsync()
{
// Prevent concurrent project context updates.
AggregateCrossTargetProjectContext newProjectContext
= await _contextUpdateGate.ExecuteWithinLockAsync(JoinableCollection, JoinableFactory, TryUpdateCurrentAggregateProjectContextAsync);
if (newProjectContext != null)
{
// Dispose existing subscriptions.
DisposeAndClearSubscriptions();
// Add subscriptions for the configured projects in the new project context.
await AddSubscriptionsAsync(newProjectContext);
}
return;
async Task <AggregateCrossTargetProjectContext?> TryUpdateCurrentAggregateProjectContextAsync()
{
AggregateCrossTargetProjectContext?previousContext = _currentAggregateProjectContext;
// Check if we have already computed the project context.
if (previousContext != null)
{
// For non-cross targeting projects, we can use the current project context if the TargetFramework hasn't changed.
// For cross-targeting projects, we need to verify that the current project context matches latest frameworks targeted by the project.
// If not, we create a new one and dispose the current one.
ConfigurationGeneral projectProperties = await _commonServices.ActiveConfiguredProjectProperties.GetConfigurationGeneralPropertiesAsync();
if (!previousContext.IsCrossTargeting)
{
string newTargetFrameworkName = (string)await projectProperties.TargetFramework.GetValueAsync();
ITargetFramework?newTargetFramework = _targetFrameworkProvider.GetTargetFramework(newTargetFrameworkName);
if (previousContext.ActiveTargetFramework.Equals(newTargetFramework))
{
// No change
return(null);
}
}
else
{
// Check if the current project context is up-to-date for the current active and known project configurations.
ProjectConfiguration activeProjectConfiguration = _commonServices.ActiveConfiguredProject.ProjectConfiguration;
IImmutableSet <ProjectConfiguration> knownProjectConfigurations = await _commonServices.Project.Services.ProjectConfigurationsService.GetKnownProjectConfigurationsAsync();
if (knownProjectConfigurations.All(c => c.IsCrossTargeting()) &&
HasMatchingTargetFrameworks(previousContext, activeProjectConfiguration, knownProjectConfigurations))
{
// No change
return(null);
}
}
}
// Force refresh the CPS active project configuration (needs UI thread).
await _commonServices.ThreadingService.SwitchToUIThread();
await _activeProjectConfigurationRefreshService.RefreshActiveProjectConfigurationAsync();
// Create new project context.
AggregateCrossTargetProjectContext newContext = await _contextProvider.Value.CreateProjectContextAsync();
_currentAggregateProjectContext = newContext;
OnAggregateContextChanged(previousContext, newContext);
return(newContext);
}
bool HasMatchingTargetFrameworks(
AggregateCrossTargetProjectContext previousContext,
ProjectConfiguration activeProjectConfiguration,
IReadOnlyCollection <ProjectConfiguration> knownProjectConfigurations)
{
Assumes.True(activeProjectConfiguration.IsCrossTargeting());
ITargetFramework?activeTargetFramework = _targetFrameworkProvider.GetTargetFramework(activeProjectConfiguration.Dimensions[ConfigurationGeneral.TargetFrameworkProperty]);
if (!previousContext.ActiveTargetFramework.Equals(activeTargetFramework))
{
// Active target framework is different.
return(false);
}
var targetFrameworkMonikers = knownProjectConfigurations
.Select(c => c.Dimensions[ConfigurationGeneral.TargetFrameworkProperty])
.Distinct()
.ToList();
if (targetFrameworkMonikers.Count != previousContext.TargetFrameworks.Length)
{
// Different number of target frameworks.
return(false);
}
foreach (string targetFrameworkMoniker in targetFrameworkMonikers)
{
ITargetFramework?targetFramework = _targetFrameworkProvider.GetTargetFramework(targetFrameworkMoniker);
if (targetFramework == null || !previousContext.TargetFrameworks.Contains(targetFramework))
{
// Differing TargetFramework
return(false);
}
}
return(true);
}
void OnAggregateContextChanged(
AggregateCrossTargetProjectContext?oldContext,
AggregateCrossTargetProjectContext newContext)
{
if (oldContext == null)
{
// all new rules will be sent to new context, we don't need to clean up anything
return;
}
var targetsToClean = new HashSet <ITargetFramework>();
ImmutableArray <ITargetFramework> oldTargets = oldContext.TargetFrameworks;
if (newContext == null)
{
targetsToClean.AddRange(oldTargets);
}
else
{
ImmutableArray <ITargetFramework> newTargets = newContext.TargetFrameworks;
targetsToClean.AddRange(oldTargets.Except(newTargets));
}
if (targetsToClean.Count != 0)
{
TryUpdateSnapshot(snapshot => snapshot.RemoveTargets(targetsToClean));
}
}
}