/// <summary>
/// Reads the specified group items using MaxAge. If the information in the cache is within the MaxAge, then the data
/// will be obtained from the cache, otherwise the server must access the device for the requested information.
/// //In addition, the ability to Read from a group based on a "MaxAge" is provided.
/// //from cache or device as determined by "staleness" of cache data
/// </summary>
/// <param name="items">The group items.</param>
/// <param name="maxAge">The MaxAge for all items.</param>
/// <returns>
/// The values of the group items.
/// </returns>
public OpcDaItemValue[] ReadMaxAge(IList <OpcDaItem> items, TimeSpan maxAge)
{
CheckItems(items);
CheckSupported(OpcDaGroupFeatures.ReadMaxAge);
TimeSpan[] maxAges = ArrayHelpers.CreateMaxAges(items.Count, maxAge);
return(ReadMaxAge(items, maxAges));
}
/// <summary>
/// Asynchronously reads the specified group items using MaxAge. If the information in the cache is within the MaxAge,
/// then the data will be obtained from the cache, otherwise the server must access the device for the requested
/// information.
/// </summary>
/// <param name="items">The group items.</param>
/// <param name="maxAge">The MaxAge for all items.</param>
/// <param name="token">The task cancellation token.</param>
/// <returns>
/// The values of the group items.
/// </returns>
public Task <OpcDaItemValue[]> ReadMaxAgeAsync(IList <OpcDaItem> items, TimeSpan maxAge,
CancellationToken token)
{
TimeSpan[] maxAges = ArrayHelpers.CreateMaxAges(items.Count, maxAge);
return(ReadMaxAgeAsync(items, maxAges, token));
}