// runs, updates and commits itself, all in one.
public void Run(IEnumerable <IShielded> trigger)
{
Shield.InTransaction(() =>
{
var oldItems = _items.Value;
if (oldItems == null || !oldItems.Overlaps(trigger))
{
return; // not subscribed anymore..
}
bool test = false;
var testItems = Shield.IsolatedRun(() => test = Test());
if (test)
{
Trans();
}
// _locals will have value if Trans() called Dispose on "itself".
if (!_locals.HasValue && !testItems.SetEquals(oldItems))
{
if (!testItems.Any())
{
// get rid of all entries first.
Remover(oldItems);
throw new InvalidOperationException(
"A conditional test function must access at least one shielded field.");
}
_items.Value = testItems;
UpdateEntries();
}
});
}
public CommitSubscription(CommitSubscriptionContext context, Func <bool> test, Action trans)
{
Context = context;
Test = test;
Trans = trans;
Shield.InTransaction(() => {
var items = Shield.IsolatedRun(() => Test());
if (!items.Any())
{
throw new InvalidOperationException(
"Test function must access at least one shielded field.");
}
_items.Value = items;
UpdateEntries();
});
}