Examples with DataValueListener org.eclipse.milo.opcua.sdk.client.subscriptions.ManagedDataItem.DataValueListener used on opensource projects

Example 1 with DataValueListener

use of org.eclipse.milo.opcua.sdk.client.subscriptions.ManagedDataItem.DataValueListener in project milo by eclipse.

the class ManagedSubscription method createDataItemsAsync.

/**
 * Create {@link ManagedDataItem}s monitoring the Nodes and Attributes identified by {@code readValueIds}.
 * <p>
 * {@code consumer} will receive each item as it is created to provide an opportunity to add a
 * {@link DataValueListener} before the first value change has arrived.
 * <p>
 * The operation results should be checked before each item is used further.
 * See {@link ManagedDataItem#getStatusCode()}.
 * <p>
 * This call completes asynchronously.
 *
 * @param samplingInterval the sampling interval to request.
 * @param readValueIds     the {@link ReadValueId}s identifying the Nodes and Attributes.
 * @param consumer         a {@link Consumer} that will receive each item as it is created.
 * @return a {@link CompletableFuture} that completes successfully with a List of {@link ManagedDataItem} or
 * completes exceptionally if a service-level error occurs.
 */
public CompletableFuture<List<ManagedDataItem>> createDataItemsAsync(double samplingInterval, List<ReadValueId> readValueIds, Consumer<ManagedDataItem> consumer) {
    final ExtensionObject filter = getDefaultDataFilter();
    final UInteger queueSize = getDefaultQueueSize();
    final boolean discardOldest = getDefaultDiscardOldest();
    List<MonitoredItemCreateRequest> createRequests = readValueIds.stream().map(readValueId -> {
        MonitoringParameters parameters = new MonitoringParameters(subscription.nextClientHandle(), samplingInterval, filter, queueSize, discardOldest);
        return new MonitoredItemCreateRequest(readValueId, getDefaultMonitoringMode(), parameters);
    }).collect(Collectors.toList());
    CompletableFuture<List<UaMonitoredItem>> monitoredItems = subscription.createMonitoredItems(getDefaultTimestamps(), createRequests, (item, id) -> {
        ManagedDataItem dataItem = createAndTrackDataItem(item);
        consumer.accept(dataItem);
    });
    return monitoredItems.thenApply(items -> items.stream().map(item -> dataItems.get(item.getClientHandle())).filter(Objects::nonNull).collect(Collectors.toList()));
}