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Need help in implementing AggregateFilter .

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Need help in implementing AggregateFilter .

January 25, 2019
17:48, EET

dipankar.invi@gmail.com

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Hi Experts,

Does Prosys supports aggregate filter ?
Could you please provide some example showing implementation of aggregate filter ?

Thanks in advance Smile

Regards,
Dipankar

January 28, 2019
15:07, EET

Teppo Uimonen

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Hi Dipankar,

Nice to hear that you found use for Aggregate Filters. Do you need an example for the Client or the Server side implementation?

Unfortunately, our Server side doesn’t support aggregate filters at the moment so that we cannot provide. However, the Client side does but of course requires a Server that supports them too.

We aim to add Server support and improve the Aggregate Filter situation in future releases Smile

January 31, 2019
12:58, EET

dipankar.invi@gmail.com

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Hi Teppo,

Thanks for your response Smile
I want client side example .

January 31, 2019
16:51, EET

Teppo Uimonen

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Most importantly, you define the used Aggregate Function with class “Identifiers”. If you need average calculation, for example, you can create an AggregateFilter for a MonitoredDataItem as follows:

MonitoredDataItem dataItem = new MonitoredDataItem(nodeId, attributeId, MonitoringMode.Reporting, subscription.getPublishingInterval());
AggregateConfiguration configuration = new AggregateConfiguration();
AggregateFilter filter = new AggregateFilter(DateTime.currentTime(), Identifiers.AggregateFunction_Average, new Double(10000), configuration);
dataItem.setAggregateFilter(filter);

This sample will start calculating average values from now on every ten seconds. Again, I remind you that AggregateFilters in Subscription are rarely supported by OPC UA Servers. In this case you may need to use a regular Subscription and do the calculation in your own code.

If you, however, want to use an AggregateFilter for HistoryRead you need to use the historyReadProcessed function of UaClient:

DataValue[] values = client.historyReadProcessed(nodeId, startTime, endTime, processingInterval, Identifiers.AggregateFunction_Average,
aggregateConfiguration, indexRange, TimestampsToReturn.Source);

January 31, 2019
19:36, EET

dipankar.invi@gmail.com

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Thanks for providing the sample code and suggestions.

February 1, 2019
7:10, EET

nisha.kale1122

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Excellent topic. Great answers by experts. It was helpful for me. Thank you.

Java Developer

August 3, 2022
17:22, EEST

miky

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Is there any way to check if AggregateFilters in Subscription is supported by OPC UA server?

Thank you

August 4, 2022
15:40, EEST

Bjarne Boström

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(adding a note here that the above aggregate filter question is being handled at https://forum.prosysopc.com/forum/opc-ua-java-sdk/aggregatefilters-in-subscription/ )

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