private void UpdateRules(CacheChangeData update)
{
if (update.NewItem == null)
{
throw new ArgumentException("update.NewItem is null: " + update);
}
string ruleName = null;
try
{
ruleName = update.NewItem.Name;
switch (update.Change)
{
case CacheChange.CacheCleared:
_ruleStore.Clear();
break;
case CacheChange.ItemExpired:
case CacheChange.ItemRemoved:
{
var oldExternalRule = (AlertRule)update.OldItem.Data;
// stop old rule
StopOldRule(oldExternalRule, null);
Logger.LogDebug("Rule {0}: Removed.", oldExternalRule.PrivateKey);
}
break;
case CacheChange.ItemCreated:
{
var newExternalRule = (AlertRule)update.NewItem.Data;
var newInternalRule = new InternalRule(newExternalRule);
StartNewRule(newExternalRule, newInternalRule);
Logger.LogDebug("Rule {0}: Created.", newExternalRule.PrivateKey);
}
break;
case CacheChange.ItemUpdated:
{
var oldExternalRule = (AlertRule)update.OldItem.Data;
var newExternalRule = (AlertRule)update.NewItem.Data;
var newInternalRule = new InternalRule(newExternalRule);
StopOldRule(oldExternalRule, newInternalRule);
StartNewRule(newExternalRule, newInternalRule);
Logger.LogDebug("Rule {0}: Updated.", newExternalRule.PrivateKey);
}
break;
}
}
catch (Exception ex)
{
ReportUncaughtError("UpdateRules", ruleName, ex, null);
}
}
private void StopOldRule(AlertRule oldExternalRule, InternalRule newInternalRule)
{
if (_ruleStore.TryGetValue(oldExternalRule.PrivateKey.ToLower(), out var oldInternalRule))
{
if (newInternalRule != null)
{
newInternalRule.LastStatus = oldInternalRule.LastStatus;
}
oldInternalRule.DataSubs?.Cancel();
}
// update rule store
_ruleStore.Remove(oldExternalRule.PrivateKey.ToLower());
}
private void StartNewRule(AlertRule newExternalRule, InternalRule newInternalRule)
{
if (!newInternalRule.Disabled && newInternalRule.DataSubsExpr != null)
{
newInternalRule.DataSubs = IntClient.Target.CreateUntypedSubscription(null, newInternalRule.DataSubsExpr);
newInternalRule.DataSubs.UserCallback =
delegate(ISubscription subscription, ICoreItem item)
{
var rule = (InternalRule)subscription.UserContext;
ICoreItem lastItem = rule.CurrentReceivedItem;
if (lastItem == null || (item.Created > lastItem.Created))
{
rule.CurrentReceivedItem = item;
}
};
newInternalRule.DataSubs.UserContext = newInternalRule;
newInternalRule.DataSubs.DataTypeName = newInternalRule.DataTypeName;
newInternalRule.DataSubs.WaitForExisting = true;
newInternalRule.DataSubs.Start();
Thread.Sleep(2000);
}
// update rule store
_ruleStore[newExternalRule.PrivateKey.ToLower()] = newInternalRule;
}
