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Monitored Item Example Uses Deprecated Implementation
August 26, 2014
12:35, EEST
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OndrejBlazek
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July 22, 2014
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In the “Prosys_OPC_UA_Java_SDK_Client_Tutorial” that comes with the JAVA SDK, the suggested code for monitoring a tag for changes is along the lines of:

MonitoredDataItem monitorItem = new MonitoredDataItem(tagNode, Attributes.Value, MonitoringMode.Reporting);
monitorItem.setSamplingInterval(SamplingRate);
monitorItem.addChangeListener(dataChangeListener);
clientSubscription.addItem(monitorItem);

This however produces a warning (not an error so the code is still usable as is but not recommended because of possible compatibility issues in the future) indicating that:

addChangeListener(MonitoredDatatItemListener) from the type MonitoredDataItem is deprecated

The code works fine with this warning and Eclipse even provide an option for suppressing the warning but it seems that this method may be removed in future versions of the SDK. What is the proper, non-deprecated, way to add data change listeners without using the deprecated addChangeListener method?

August 27, 2014
10:07, EEST
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Jouni Aro
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December 21, 2011
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Yes the new way to register the listener is to use setDataChangeListener() – the previous list backend was changed to a single instance to improve performance. addChangeLIstener() will call that one, if it’s not set already.

This has been changed in the SampleConsoleClient, but the Tutorial doc was still referring to the old method. Will be fixed in the next release.

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