/// <summary>
/// Ctor.
/// </summary>
/// <param name="filterSpec">specifies what events we are interested in.</param>
/// <param name="viewSpecs">specifies what view to use to derive data</param>
/// <param name="optionalStreamName">stream name, or null if none supplied</param>
/// <param name="streamSpecOptions">additional options such as unidirectional stream in a join</param>
public FilterStreamSpecCompiled(
FilterSpecCompiled filterSpec,
ViewSpec[] viewSpecs,
string optionalStreamName,
StreamSpecOptions streamSpecOptions)
: base(optionalStreamName, viewSpecs, streamSpecOptions)
{
FilterSpecCompiled = filterSpec;
}
public ViewFactoryForgeArgs(
int streamNum,
bool isSubquery,
int subqueryNumber,
StreamSpecOptions options,
string optionalCreateNamedWindowName,
StatementRawInfo statementRawInfo,
StatementCompileTimeServices compileTimeServices)
{
StatementRawInfo = statementRawInfo;
StreamNum = streamNum;
Options = options;
IsSubquery = isSubquery;
SubqueryNumber = subqueryNumber;
OptionalCreateNamedWindowName = optionalCreateNamedWindowName;
CompileTimeServices = compileTimeServices;
}
public ViewFactoryChain CreateFactories(int streamNum, EventType parentEventType, ViewSpec[] viewSpecDefinitions, StreamSpecOptions options, StatementContext context, bool isSubquery, int subqueryNumber)
{
// Clone the view spec list to prevent parameter modification
IList <ViewSpec> viewSpecList = new List <ViewSpec>(viewSpecDefinitions);
// Inspect views and add merge views if required
ViewServiceHelper.AddMergeViews(viewSpecList);
// Instantiate factories, not making them aware of each other yet
var viewFactories = ViewServiceHelper.InstantiateFactories(streamNum, viewSpecList, context, isSubquery, subqueryNumber);
ViewFactory parentViewFactory = null;
IList <ViewFactory> attachedViewFactories = new List <ViewFactory>();
for (var i = 0; i < viewFactories.Count; i++)
{
var factoryToAttach = viewFactories[i];
try
{
factoryToAttach.Attach(parentEventType, context, parentViewFactory, attachedViewFactories);
attachedViewFactories.Add(viewFactories[i]);
parentEventType = factoryToAttach.EventType;
}
catch (ViewParameterException ex)
{
var text = "Error attaching view to parent view";
if (i == 0)
{
text = "Error attaching view to event stream";
}
throw new ViewProcessingException(text + ": " + ex.Message, ex);
}
}
// obtain count of data windows
var dataWindowCount = 0;
var firstNonDataWindowIndex = -1;
for (var i = 0; i < viewFactories.Count; i++)
{
var factory = viewFactories[i];
if (factory is DataWindowViewFactory)
{
dataWindowCount++;
continue;
}
if ((factory is GroupByViewFactoryMarker) || (factory is MergeViewFactory))
{
continue;
}
if (firstNonDataWindowIndex == -1)
{
firstNonDataWindowIndex = i;
}
}
var isAllowMultipleExpiry = context.ConfigSnapshot.EngineDefaults.ViewResources.IsAllowMultipleExpiryPolicies;
var isRetainIntersection = options.IsRetainIntersection;
var isRetainUnion = options.IsRetainUnion;
// Set the default to retain-intersection unless allow-multiple-expiry is turned on
if ((!isAllowMultipleExpiry) && (!isRetainUnion))
{
isRetainIntersection = true;
}
// handle multiple data windows with retain union.
// wrap view factories into the union view factory and handle a group-by, if present
if ((isRetainUnion || isRetainIntersection) && dataWindowCount > 1)
{
viewFactories = GetRetainViewFactories(parentEventType, viewFactories, isRetainUnion, context);
}
return(new ViewFactoryChain(parentEventType, viewFactories));
}
