internal MjolnirConfigurationObserver(MjolnirConfiguration currentConfig,
Func <MjolnirConfiguration, T> propertyToCheck, Action <T> onChange)
{
_expression = propertyToCheck;
_currentValue = _expression(currentConfig);
_onChange = onChange;
}
public void OnNext(MjolnirConfiguration value)
{
var newValue = _expression(value);
var hasChanged = !Equals(_currentValue, newValue);
if (!hasChanged)
{
return;
}
try
{
// Invoke onChange action to act apon config change.
_onChange(newValue);
}
catch (Exception)
{
// Even if onChange implementation returns exception we still want to process other changes. Exception
// here should not affect observable implementation.
}
finally
{
_currentValue = newValue;
}
}
internal static IDisposable OnConfigurationChanged <T>(this MjolnirConfiguration currentConfig, Func <MjolnirConfiguration, T> propertyToCheck, Action <T> onChangeAction)
{
var observer = new MjolnirConfigurationObserver <T>(currentConfig, propertyToCheck, onChangeAction);
return(currentConfig.Subscribe(observer));
}
