public void UpdateTable(
ICollection<EventBean> eventsUnsafeIter,
TableInstance instance,
EventBean[] eventsPerStream,
ExprEvaluatorContext exprEvaluatorContext)
{
// copy references to array - as it is allowed to pass an index-originating collection
// and those same indexes are being changed now
var events = new EventBean[eventsUnsafeIter.Count];
var count = 0;
foreach (var @event in eventsUnsafeIter) {
events[count++] = @event;
}
// remove from affected indexes
foreach (var affectedIndexName in affectedIndexNames) {
var index = instance.GetIndex(affectedIndexName);
index.Remove(events, instance.AgentInstanceContext);
}
// update (no-copy unless original values required)
foreach (var @event in events) {
eventsPerStream[0] = @event;
var updatedEvent = (ObjectArrayBackedEventBean) @event;
// if "initial.property" is part of the assignment expressions, provide initial value event
if (updateHelper.IsRequiresStream2InitialValueEvent) {
var prev = new object[updatedEvent.Properties.Length];
Array.Copy(updatedEvent.Properties, 0, prev, 0, prev.Length);
eventsPerStream[2] = new ObjectArrayEventBean(prev, updatedEvent.EventType);
}
// apply in-place updates
updateHelper.UpdateNoCopy(updatedEvent, eventsPerStream, exprEvaluatorContext);
instance.HandleRowUpdated(updatedEvent);
}
// add to affected indexes
foreach (var affectedIndexName in affectedIndexNames) {
var index = instance.GetIndex(affectedIndexName);
index.Add(events, instance.AgentInstanceContext);
}
}
public void UpdateTable(
ICollection<EventBean> eventsUnsafeIter,
TableInstance instance,
EventBean[] eventsPerStream,
ExprEvaluatorContext exprEvaluatorContext)
{
// copy references to array - as it is allowed to pass an index-originating collection
// and those same indexes are being changed now
var events = new EventBean[eventsUnsafeIter.Count];
var count = 0;
foreach (var @event in eventsUnsafeIter) {
events[count++] = @event;
}
// remove from affected indexes
foreach (var affectedIndexName in _affectedIndexNames) {
var index = instance.GetIndex(affectedIndexName);
index.Remove(events, exprEvaluatorContext);
}
// copy event data, since we are updating unique keys and must guarantee rollback (no half update)
var previousData = new object[events.Length][];
// copy and then update
for (var i = 0; i < events.Length; i++) {
eventsPerStream[0] = events[i];
// copy non-aggregated value references
var updatedEvent = (ObjectArrayBackedEventBean) events[i];
var prev = new object[updatedEvent.Properties.Length];
Array.Copy(updatedEvent.Properties, 0, prev, 0, prev.Length);
previousData[i] = prev;
// if "initial.property" is part of the assignment expressions, provide initial value event
if (_updateHelper.IsRequiresStream2InitialValueEvent) {
eventsPerStream[2] = new ObjectArrayEventBean(prev, updatedEvent.EventType);
}
// apply in-place updates
instance.HandleRowUpdateKeyBeforeUpdate(updatedEvent);
_updateHelper.UpdateNoCopy(updatedEvent, eventsPerStream, exprEvaluatorContext);
instance.HandleRowUpdateKeyAfterUpdate(updatedEvent);
}
// add to affected indexes
try {
foreach (var affectedIndexName in _affectedIndexNames) {
var index = instance.GetIndex(affectedIndexName);
index.Add(events, exprEvaluatorContext);
}
}
catch (EPException) {
// rollback
// remove updated events
foreach (var affectedIndexName in _affectedIndexNames) {
var index = instance.GetIndex(affectedIndexName);
index.Remove(events, exprEvaluatorContext);
}
// rollback change to events
for (var i = 0; i < events.Length; i++) {
var oa = (ObjectArrayBackedEventBean) events[i];
oa.PropertyValues = previousData[i];
}
// add old events
foreach (var affectedIndexName in _affectedIndexNames) {
var index = instance.GetIndex(affectedIndexName);
index.Add(events, exprEvaluatorContext);
}
throw;
}
}
