/// <summary>
/// Constructor
/// </summary>
/// <param name="plc"> The plc object that is used to forward all calls to the <see cref="IPlc"/> interface to. </param>
/// <param name="plcItemMonitorConfigurations"> <see cref="PlcItemMonitorConfigurations"/> for specifying special polling frequencies for some <see cref="IPlcItem"/>s. </param>
public PollingMonitorablePlc(IPlc plc, PlcItemMonitorConfigurations plcItemMonitorConfigurations)
{
// Save parameters.
_decoratedPlc = plc;
// Initialize fields.
_plcMonitor = new PollingPlcMonitor(plc, plcItemMonitorConfigurations);
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="plc"> <see cref="IPlc"/> instance used to poll for changes in the monitored <see cref="IPlcItem"/>s. </param>
/// <param name="plcItemMonitorConfigurations"> <see cref="PlcItemMonitorConfigurations"/> for specifying special polling frequencies for some <see cref="IPlcItem"/>s. </param>
public PollingPlcMonitor(IPlc plc, PlcItemMonitorConfigurations plcItemMonitorConfigurations)
{
// Save parameters.
_plc = plc;
_plcItemMonitorConfigurations = plcItemMonitorConfigurations ?? new PlcItemMonitorConfigurations();
// Initialize fields.
_lock = new object();
_plcItemHandlers = new Dictionary <int, PlcItemMonitorHandler>();
}
/// <summary>
/// Gets the polling frequency for the <paramref name="plcItem"/>.
/// </summary>
/// <param name="plcItem"> The <see cref="IPlcItem"/> whose polling frequency to get. </param>
/// <returns> The polling frequency. </returns>
public TimeSpan GetPollingFrequencyForPlcItem(IPlcItem plcItem)
{
// Use the defined value for the item if available.
if (plcItem.Identifier != null && base.Contains(plcItem.Identifier))
{
return(PlcItemMonitorConfigurations.ValidatePollingFrequency(TimeSpan.FromMilliseconds(base[plcItem.Identifier].PollingFrequency)));
}
// Otherwise the default polling frequency is used.
return(PlcItemMonitorConfigurations.DefaultPollingFrequency);
}
