internal async Task OnStopped(QueryETag etag, string error)
{
if (_instancesByKey.TryGetValue(etag.Key, out var instance))
{
await _notifier.NotifyStopped(etag, error, instance.ConnectionIds);
}
_changedWindow.OnChanged(etag);
}
internal void OnChanged(QueryETag etag)
{
var now = Clock.Now;
_queriesByKey[etag.Key] = new QueryWindow(etag, now);
if (now - _whenTrimmed > _trimDelay)
{
TrimQueries(now);
}
}
public static Task <QueryContent> ReadQueryContent(this IQueryDb db, string etag, Type type, Id id) =>
db.ReadQueryContent(area =>
{
if (!string.IsNullOrWhiteSpace(etag))
{
return(QueryETag.From(etag, area));
}
var key = FlowKey.From(area.Queries[type], id);
return(QueryETag.From(key, TimelinePosition.None));
});
public async Task SubscribeToChanged(Id connectionId, QueryETag etag)
{
var connection = _connectionsById.GetOrAdd(connectionId, _ => new QueryConnection(connectionId, this));
var instance = _instancesByKey.GetOrAdd(etag.Key, _ => new QueryInstance(etag.Key, this));
connection.Subscribe(instance);
var latestETag = _changedWindow.OnSubscribed(etag);
if (latestETag != etag)
{
await _notifier.NotifyChanged(latestETag, Many.Of(connectionId));
}
}
public QueryContent(QueryETag etag, Stream content)
{
ETag = etag;
_data = content;
}
public QueryContent(QueryETag etag)
{
ETag = etag;
NotModified = true;
}
public Task OnQueryStopped(QueryETag query, string error) => _queries.OnStopped(query, error);
public Task OnQueryChanged(QueryETag query) => _queries.OnChanged(query);
public QueryState(QueryETag etag, Stream content)
{
ETag = etag;
_content = content;
}
public QueryState(QueryETag etag)
{
ETag = etag;
NotModified = true;
}
internal QueryETag GetLatest(QueryETag etag) => _etag.GetLatest(etag);
internal QueryWindow(QueryETag etag, DateTimeOffset whenChanged)
{
_etag = etag;
_whenChanged = whenChanged;
}
internal QueryETag OnSubscribed(QueryETag etag) => _queriesByKey .GetOrAdd(etag.Key, _ => new QueryWindow(etag, Clock.Now)) .GetLatest(etag);