StoreAndForward exception

Module Development
1

I’m trying to manually store tag history using the following lines:

[code]HistoricalTagValue histValue = new PackedHistoricalTagValue(this.getTagPath(), this.getDataTypeClass(), InterpolationMode.Discrete, TimestampSource.Value, new BasicTagValue(value, DataQuality.GOOD_DATA, timeStamp));

context.getHistoryManager().storeHistory(getAttribute(TagProp.PrimaryHistoryProvider).getValue().toString(), histValue);[/code]

However this generates an class cast exception in StoreAndForward and the values are quarantined.

[code]
MemoryForwardTransaction Error forwarding data: com.inductiveautomation.ignition.gateway.history.PackedHistoricalTagValue cannot be cast to com.inductiveautomation.ignition.gateway.history.ScanclassHistorySet

java.lang.ClassCastException: com.inductiveautomation.ignition.gateway.history.PackedHistoricalTagValue cannot be cast to com.inductiveautomation.ignition.gateway.history.ScanclassHistorySet
at com.inductiveautomation.ignition.gateway.sqltags.history.storage.TagHistoryDatasourceSink.storeDataToDatasource(TagHistoryDatasourceSink.java:308)
at com.inductiveautomation.ignition.gateway.history.sinks.AbstractDatasourceSink.storeToDatasource(AbstractDatasourceSink.java:123)
at com.inductiveautomation.ignition.gateway.history.sinks.AbstractDatasourceSink.storeData(AbstractDatasourceSink.java:99)
at com.inductiveautomation.ignition.gateway.history.sinks.AggregateSink.storeData(AggregateSink.java:147)
at com.inductiveautomation.ignition.gateway.history.forwarders.ForwarderThread.run(ForwarderThread.java:138)[/code]

Do I need to be using BasicScanclassHistorySet to store data? Anything I’m missing here?

Cheers
Ivan

2

Hi,

Yes, apparently you do need to use the ScanclassHistorySet. It shouldn’t necessarily be like that, but that’s how it goes for now. Just use [tt]BasicScanclassHistorySet[/tt], create it with any name you want and a rate of 0 (the 0 rate will tell the system not to actually store execution statistics for it), and add your values to it.

Regards,