public Task<EventInStorage> Fetch(FetchEventRequest request)
{
if (_queue.Count >= _maxSize)
throw new StorageReaderBusyException(_maxSize);
var entry = new Entry(request, _maxAgeBeforeDrop);
_queue.Enqueue(entry);
return entry.Task;
}
public Dictionary<Guid, EventInStorage> FetchEvent(FetchEventRequest[] request)
{
var results = _events.Join(request, x => new Tuple<Guid, string, object>(x.EventId, x.Context, x.Stream),
x => new Tuple<Guid, string, object>(x.EventId, x.Context, x.Stream),
(x, y) => new KeyValuePair<Guid, EventInStorage>(y.RequestId, x))
.ToDictionary(x => x.Key, x => x.Value);
ReadCount++;
return results;
}
public Dictionary<Guid, EventInStorage> FetchEvent(FetchEventRequest[] request)
{
try
{
return doFetchEvents(request);
}
catch (Exception e)
{
throw new EventStorageException(e);
}
}
public Entry(FetchEventRequest request, TimeSpan maxAge)
{
Request = request;
_maxAge = maxAge;
_dropTime = DateTime.Now.Add(maxAge);
_task = new TaskCompletionSource<EventInStorage>();
}
public EventNotFoundException(FetchEventRequest request)
: base(string.Format("The event with context: {0}, stream: {1}, eventId: {2} was not found.", request.Context, request.Stream, request.EventId))
{
Request = request;
}
private SqlParameter getFetchParameter(FetchEventRequest[] requestses)
{
var table = getEmptyFetchEventsTable();
addFetchRequestsToTable(requestses, table);
var parameter = new SqlParameter("Events", SqlDbType.Structured);
parameter.Value = table;
parameter.TypeName = "EventRequestParameter";
return parameter;
}
private Dictionary<Guid, EventInStorage> doFetchEvents(FetchEventRequest[] request)
{
var results = new Dictionary<Guid, EventInStorage>();
var parameter = getFetchParameter(request);
using (var connection = new SqlConnection(_connectionString))
using (var command = new SqlCommand("FetchEvent", connection))
{
command.CommandType = CommandType.StoredProcedure;
command.Parameters.Add(parameter);
command.Connection.Open();
using (var reader = command.ExecuteReader())
{
while (reader.Read())
{
var requestId = reader.GetGuid(0);
var e = readEventInStorage(reader, 1);
results[requestId] = e;
}
return results;
}
}
}
private void addFetchRequestsToTable(FetchEventRequest[] requestses, DataTable table)
{
foreach (var request in requestses)
{
table.Rows.Add(request.EventId, request.Stream, request.Context, request.RequestId);
}
}