Examples with MonitoredEventItem org.eclipse.milo.opcua.sdk.server.items.MonitoredEventItem used on opensource projects

Example 1 with MonitoredEventItem

use of org.eclipse.milo.opcua.sdk.server.items.MonitoredEventItem in project milo by eclipse.

the class SubscriptionManager method createMonitoredItem.

private BaseMonitoredItem<?> createMonitoredItem(MonitoredItemCreateRequest request, Subscription subscription, TimestampsToReturn timestamps, Map<NodeId, AttributeGroup> attributeGroups) throws UaException {
    NodeId nodeId = request.getItemToMonitor().getNodeId();
    UInteger attributeId = request.getItemToMonitor().getAttributeId();
    QualifiedName dataEncoding = request.getItemToMonitor().getDataEncoding();
    if (!AttributeId.isValid(attributeId)) {
        throw new UaException(StatusCodes.Bad_AttributeIdInvalid);
    }
    if (dataEncoding.isNotNull()) {
        if (!AttributeId.Value.isEqual(attributeId)) {
            throw new UaException(StatusCodes.Bad_DataEncodingInvalid);
        }
        if (!dataEncoding.equals(DEFAULT_BINARY_ENCODING) && !dataEncoding.equals(DEFAULT_XML_ENCODING)) {
            throw new UaException(StatusCodes.Bad_DataEncodingUnsupported);
        }
    }
    AttributeGroup attributeGroup = attributeGroups.get(nodeId);
    if (attributeId.equals(AttributeId.EventNotifier.uid())) {
        UByte eventNotifier = attributeGroup.getEventNotifier();
        // Verify that the SubscribeToEvents bit is set
        if (eventNotifier == null || (eventNotifier.intValue() & 1) == 0) {
            throw new UaException(StatusCodes.Bad_AttributeIdInvalid);
        }
        Object filterObject = request.getRequestedParameters().getFilter().decode(server.getSerializationContext());
        MonitoringFilter filter = validateEventItemFilter(filterObject, attributeGroup);
        UInteger requestedQueueSize = request.getRequestedParameters().getQueueSize();
        AtomicReference<UInteger> revisedQueueSize = new AtomicReference<>(requestedQueueSize);
        try {
            server.getAddressSpaceManager().onCreateEventItem(request.getItemToMonitor(), requestedQueueSize, revisedQueueSize::set);
        } catch (Throwable t) {
            throw new UaException(StatusCodes.Bad_InternalError, t);
        }
        MonitoredEventItem monitoredEventItem = new MonitoredEventItem(server, session, uint(subscription.nextItemId()), subscription.getId(), request.getItemToMonitor(), request.getMonitoringMode(), timestamps, request.getRequestedParameters().getClientHandle(), 0.0, revisedQueueSize.get(), request.getRequestedParameters().getDiscardOldest());
        monitoredEventItem.installFilter(filter);
        return monitoredEventItem;
    } else {
        if (attributeId.equals(AttributeId.Value.uid())) {
            UByte accessLevel = attributeGroup.getAccessLevel();
            if (accessLevel == null)
                accessLevel = ubyte(0);
            UByte userAccessLevel = attributeGroup.getUserAccessLevel();
            if (userAccessLevel == null)
                userAccessLevel = ubyte(0);
            EnumSet<AccessLevel> accessLevels = AccessLevel.fromValue(accessLevel);
            EnumSet<AccessLevel> userAccessLevels = AccessLevel.fromValue(userAccessLevel);
            if (!accessLevels.contains(AccessLevel.CurrentRead)) {
                throw new UaException(StatusCodes.Bad_NotReadable);
            }
            if (!userAccessLevels.contains(AccessLevel.CurrentRead)) {
                throw new UaException(StatusCodes.Bad_UserAccessDenied);
            }
        }
        // Validate the requested index range by parsing it.
        String indexRange = request.getItemToMonitor().getIndexRange();
        if (indexRange != null)
            NumericRange.parse(indexRange);
        Double minimumSamplingInterval = -1.0;
        try {
            minimumSamplingInterval = attributeGroup.getMinimumSamplingInterval();
            if (minimumSamplingInterval == null) {
                minimumSamplingInterval = server.getConfig().getLimits().getMinSupportedSampleRate();
            }
        } catch (UaException e) {
            if (e.getStatusCode().getValue() != StatusCodes.Bad_AttributeIdInvalid) {
                throw e;
            }
        }
        MonitoringFilter filter = MonitoredDataItem.DEFAULT_FILTER;
        try {
            ExtensionObject filterXo = request.getRequestedParameters().getFilter();
            if (filterXo != null && !filterXo.isNull()) {
                Object filterObject = filterXo.decode(server.getSerializationContext());
                filter = validateDataItemFilter(filterObject, attributeId, attributeGroup);
            }
        } catch (UaSerializationException e) {
            logger.debug("error decoding MonitoringFilter", e);
            throw new UaException(StatusCodes.Bad_MonitoredItemFilterInvalid, e);
        }
        double requestedSamplingInterval = getSamplingInterval(subscription, minimumSamplingInterval, request.getRequestedParameters().getSamplingInterval());
        UInteger requestedQueueSize = request.getRequestedParameters().getQueueSize();
        AtomicReference<Double> revisedSamplingInterval = new AtomicReference<>(requestedSamplingInterval);
        AtomicReference<UInteger> revisedQueueSize = new AtomicReference<>(requestedQueueSize);
        try {
            server.getAddressSpaceManager().onCreateDataItem(request.getItemToMonitor(), requestedSamplingInterval, requestedQueueSize, (rsi, rqs) -> {
                revisedSamplingInterval.set(rsi);
                revisedQueueSize.set(rqs);
            });
        } catch (Throwable t) {
            throw new UaException(StatusCodes.Bad_InternalError, t);
        }
        MonitoredDataItem monitoredDataItem = new MonitoredDataItem(server, session, uint(subscription.nextItemId()), subscription.getId(), request.getItemToMonitor(), request.getMonitoringMode(), timestamps, request.getRequestedParameters().getClientHandle(), revisedSamplingInterval.get(), revisedQueueSize.get(), request.getRequestedParameters().getDiscardOldest());
        monitoredDataItem.installFilter(filter);
        return monitoredDataItem;
    }
}