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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.PMR.Diagnostics;
namespace Tango.Integration.Operation
{
/// <summary>
/// Represents the default machine events state provider.
/// </summary>
/// <seealso cref="Tango.Integration.Operation.IMachineEventsStateProvider" />
public class DefaultMachineEventsStateProvider : IMachineEventsStateProvider
{
private ReadOnlyCollection<Event> _events;
/// <summary>
/// Gets the current machine events.
/// </summary>
public ReadOnlyCollection<Event> Events
{
get
{
return _events;
}
}
/// <summary>
/// Occurs when new events are available.
/// </summary>
public event EventHandler<IEnumerable<Event>> NewEvents;
/// <summary>
/// Occurs when a new events states has been received.
/// </summary>
public event EventHandler<IEnumerable<Event>> EventsReceived;
/// <summary>
/// Initializes a new instance of the <see cref="DefaultMachineEventsStateProvider"/> class.
/// </summary>
public DefaultMachineEventsStateProvider()
{
_events = new ReadOnlyCollection<Event>(new Collection<Event>());
}
/// <summary>
/// Applies the collection of events received from the machine operator.
/// </summary>
/// <param name="events">The events.</param>
public void ApplyEvents(IEnumerable<Event> events)
{
List<Event> currentEvents = Events.ToList();
List<Event> newEvents = events.Where(x => !currentEvents.Exists(y => y.Type == x.Type)).ToList();
_events = new ReadOnlyCollection<Event>(new Collection<Event>(events.ToList()));
OnNewEvents(newEvents);
OnEventsReceived(events);
}
/// <summary>
/// Called when the new has been events
/// </summary>
/// <param name="events">The events.</param>
protected virtual void OnNewEvents(IEnumerable<Event> events)
{
NewEvents?.Invoke(this, events);
}
/// <summary>
/// Called when the events has been received
/// </summary>
/// <param name="events">The events.</param>
protected virtual void OnEventsReceived(IEnumerable<Event> events)
{
EventsReceived?.Invoke(this, events);
}
}
}
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