async Task IShellDescriptorManagerEventHandler.Changed(ShellDescriptor descriptor, string tenant)
{
// deduce and apply state changes involved
var shellState = await _stateManager.GetShellStateAsync();
foreach (var feature in descriptor.Features)
{
var featureName = feature.Name;
var featureState = shellState.Features.SingleOrDefault(f => f.Name == featureName);
if (featureState == null)
{
featureState = new ShellFeatureState
{
Name = featureName
};
}
if (!featureState.IsInstalled)
{
_stateManager.UpdateInstalledState(featureState, ShellFeatureState.State.Rising);
}
if (!featureState.IsEnabled)
{
_stateManager.UpdateEnabledState(featureState, ShellFeatureState.State.Rising);
}
}
foreach (var featureState in shellState.Features)
{
var featureName = featureState.Name;
if (descriptor.Features.Any(f => f.Name == featureName))
{
continue;
}
if (!featureState.IsDisabled)
{
_stateManager.UpdateEnabledState(featureState, ShellFeatureState.State.Falling);
}
}
FireApplyChangesIfNeeded();
}
public void UpdateInstalledState(ShellFeatureState featureState, ShellFeatureState.State value)
{
if (Logger.IsEnabled(LogLevel.Debug))
{
Logger.LogDebug("Feature {0} InstallState changed from {1} to {2}", featureState.Name, featureState.InstallState, value);
}
var previousFeatureState = GetOrCreateFeatureState(featureState.Name);
if (previousFeatureState.InstallState != featureState.InstallState)
{
if (Logger.IsEnabled(LogLevel.Warning))
{
Logger.LogWarning("Feature {0} prior InstallState was {1} when {2} was expected",
featureState.Name, previousFeatureState.InstallState, featureState.InstallState);
}
}
previousFeatureState.InstallState = value;
featureState.InstallState = value;
UpdateShellState();
}
static bool IsRising(ShellFeatureState state)
{
return state.InstallState == ShellFeatureState.State.Rising ||
state.EnableState == ShellFeatureState.State.Rising;
}
private static bool FeatureShouldBeLoadedForStateChangeNotifications(ShellFeatureState shellFeatureState)
{
return FeatureIsChanging(shellFeatureState) || shellFeatureState.EnableState == ShellFeatureState.State.Up;
}
private static bool FeatureIsChanging(ShellFeatureState shellFeatureState)
{
if (shellFeatureState.EnableState == ShellFeatureState.State.Rising ||
shellFeatureState.EnableState == ShellFeatureState.State.Falling)
{
return true;
}
if (shellFeatureState.InstallState == ShellFeatureState.State.Rising ||
shellFeatureState.InstallState == ShellFeatureState.State.Falling)
{
return true;
}
return false;
}
private ShellFeatureState GetOrCreateFeatureState(string name)
{
var featureState = GetShellStateAsync().Result.Features.FirstOrDefault(x => x.Name == name);
if (featureState == null)
{
featureState = new ShellFeatureState() { Name = name };
_shellState.Features.Add(featureState);
}
return featureState;
}