/// <summary>
/// Initializes a new instance of the <see cref="SubscriptionBase"/> class.
/// </summary>
public SubscriptionBase()
{
this.application = UaApplication.Current;
this.application?.Completion.ContinueWith(t => this.stateMachineCts?.Cancel());
this.logger = this.application?.LoggerFactory?.CreateLogger(this.GetType());
this.errors = new ErrorsContainer <string>(p => this.ErrorsChanged?.Invoke(this, new DataErrorsChangedEventArgs(p)));
this.progress = new Progress <CommunicationState>(s => this.State = s);
this.propertyChanged += this.OnPropertyChanged;
this.whenSubscribed = new TaskCompletionSource <bool>();
this.whenUnsubscribed = new TaskCompletionSource <bool>();
this.whenUnsubscribed.TrySetResult(true);
// register the action to be run on the ui thread, if there is one.
if (SynchronizationContext.Current != null)
{
this.actionBlock = new ActionBlock <PublishResponse>(pr => this.OnPublishResponse(pr), new ExecutionDataflowBlockOptions {
SingleProducerConstrained = true, TaskScheduler = TaskScheduler.FromCurrentSynchronizationContext()
});
}
else
{
this.actionBlock = new ActionBlock <PublishResponse>(pr => this.OnPublishResponse(pr), new ExecutionDataflowBlockOptions {
SingleProducerConstrained = true
});
}
// read [Subscription] attribute.
var typeInfo = this.GetType().GetTypeInfo();
var sa = typeInfo.GetCustomAttribute <SubscriptionAttribute>();
if (sa != null)
{
this.endpointUrl = sa.EndpointUrl;
this.publishingInterval = sa.PublishingInterval;
this.keepAliveCount = sa.KeepAliveCount;
this.lifetimeCount = sa.LifetimeCount;
}
// read [MonitoredItem] attributes.
foreach (var propertyInfo in typeInfo.DeclaredProperties)
{
var mia = propertyInfo.GetCustomAttribute <MonitoredItemAttribute>();
if (mia == null || string.IsNullOrEmpty(mia.NodeId))
{
continue;
}
MonitoringFilter filter = null;
if (mia.AttributeId == AttributeIds.Value && (mia.DataChangeTrigger != DataChangeTrigger.StatusValue || mia.DeadbandType != DeadbandType.None))
{
filter = new DataChangeFilter()
{
Trigger = mia.DataChangeTrigger, DeadbandType = (uint)mia.DeadbandType, DeadbandValue = mia.DeadbandValue
};
}
var propType = propertyInfo.PropertyType;
if (propType == typeof(DataValue))
{
this.monitoredItems.Add(new DataValueMonitoredItem(
target: this,
property: propertyInfo,
nodeId: NodeId.Parse(mia.NodeId),
indexRange: mia.IndexRange,
attributeId: mia.AttributeId,
samplingInterval: mia.SamplingInterval,
filter: filter,
queueSize: mia.QueueSize,
discardOldest: mia.DiscardOldest));
continue;
}
if (propType == typeof(BaseEvent) || propType.GetTypeInfo().IsSubclassOf(typeof(BaseEvent)))
{
this.monitoredItems.Add(new EventMonitoredItem(
target: this,
property: propertyInfo,
nodeId: NodeId.Parse(mia.NodeId),
indexRange: mia.IndexRange,
attributeId: mia.AttributeId,
samplingInterval: mia.SamplingInterval,
filter: new EventFilter()
{
SelectClauses = EventHelper.GetSelectClauses(propType)
},
queueSize: mia.QueueSize,
discardOldest: mia.DiscardOldest));
continue;
}
if (propType == typeof(ObservableQueue <DataValue>))
{
this.monitoredItems.Add(new DataValueQueueMonitoredItem(
target: this,
property: propertyInfo,
nodeId: NodeId.Parse(mia.NodeId),
indexRange: mia.IndexRange,
attributeId: mia.AttributeId,
samplingInterval: mia.SamplingInterval,
filter: filter,
queueSize: mia.QueueSize,
discardOldest: mia.DiscardOldest));
continue;
}
if (propType.IsConstructedGenericType && propType.GetGenericTypeDefinition() == typeof(ObservableQueue <>))
{
var elemType = propType.GenericTypeArguments[0];
if (elemType == typeof(BaseEvent) || elemType.GetTypeInfo().IsSubclassOf(typeof(BaseEvent)))
{
this.monitoredItems.Add((MonitoredItemBase)Activator.CreateInstance(
typeof(EventQueueMonitoredItem <>).MakeGenericType(elemType),
this,
propertyInfo,
NodeId.Parse(mia.NodeId),
mia.AttributeId,
mia.IndexRange,
MonitoringMode.Reporting,
mia.SamplingInterval,
new EventFilter()
{
SelectClauses = EventHelper.GetSelectClauses(elemType)
},
mia.QueueSize,
mia.DiscardOldest));
continue;
}
}
this.monitoredItems.Add(new ValueMonitoredItem(
target: this,
property: propertyInfo,
nodeId: NodeId.Parse(mia.NodeId),
indexRange: mia.IndexRange,
attributeId: mia.AttributeId,
samplingInterval: mia.SamplingInterval,
filter: filter,
queueSize: mia.QueueSize,
discardOldest: mia.DiscardOldest));
}
this.stateMachineCts = new CancellationTokenSource();
this.stateMachineTask = Task.Run(() => this.StateMachineAsync(this.stateMachineCts.Token));
}
/// <summary>
/// Initializes a new instance of the <see cref="MonitoredItemCollection"/> class.
/// Attributes found in the given subscription are added to the collection.
/// </summary>
/// <param name="subscription">the instance that will be inspected for [MonitoredItem] attributes.</param>
public MonitoredItemCollection(ISubscription subscription)
{
var typeInfo = subscription.GetType().GetTypeInfo();
foreach (var propertyInfo in typeInfo.DeclaredProperties)
{
var itemAttribute = propertyInfo.GetCustomAttribute <MonitoredItemAttribute>();
if (itemAttribute == null || string.IsNullOrEmpty(itemAttribute.NodeId))
{
continue;
}
MonitoringFilter filter = null;
if (itemAttribute.AttributeId == AttributeIds.Value && (itemAttribute.DataChangeTrigger != DataChangeTrigger.StatusValue || itemAttribute.DeadbandType != DeadbandType.None))
{
filter = new DataChangeFilter()
{
Trigger = itemAttribute.DataChangeTrigger, DeadbandType = (uint)itemAttribute.DeadbandType, DeadbandValue = itemAttribute.DeadbandValue
};
}
var propType = propertyInfo.PropertyType;
if (propType == typeof(DataValue))
{
this.Add(new DataValueMonitoredItem(
target: subscription,
property: propertyInfo,
nodeId: NodeId.Parse(itemAttribute.NodeId),
indexRange: itemAttribute.IndexRange,
attributeId: itemAttribute.AttributeId,
samplingInterval: itemAttribute.SamplingInterval,
filter: filter,
queueSize: itemAttribute.QueueSize,
discardOldest: itemAttribute.DiscardOldest));
continue;
}
if (propType == typeof(ObservableQueue <DataValue>))
{
this.Add(new DataValueQueueMonitoredItem(
target: subscription,
property: propertyInfo,
nodeId: NodeId.Parse(itemAttribute.NodeId),
indexRange: itemAttribute.IndexRange,
attributeId: itemAttribute.AttributeId,
samplingInterval: itemAttribute.SamplingInterval,
filter: filter,
queueSize: itemAttribute.QueueSize,
discardOldest: itemAttribute.DiscardOldest));
continue;
}
if (propType == typeof(BaseEvent) || propType.GetTypeInfo().IsSubclassOf(typeof(BaseEvent)))
{
this.Add(new EventMonitoredItem(
target: subscription,
property: propertyInfo,
nodeId: NodeId.Parse(itemAttribute.NodeId),
indexRange: itemAttribute.IndexRange,
attributeId: itemAttribute.AttributeId,
samplingInterval: itemAttribute.SamplingInterval,
filter: new EventFilter()
{
SelectClauses = EventHelper.GetSelectClauses(propType)
},
queueSize: itemAttribute.QueueSize,
discardOldest: itemAttribute.DiscardOldest));
continue;
}
if (propType.IsConstructedGenericType && propType.GetGenericTypeDefinition() == typeof(ObservableQueue <>))
{
var elemType = propType.GenericTypeArguments[0];
if (elemType == typeof(BaseEvent) || elemType.GetTypeInfo().IsSubclassOf(typeof(BaseEvent)))
{
this.Add((MonitoredItemBase)Activator.CreateInstance(
typeof(EventQueueMonitoredItem <>).MakeGenericType(elemType),
subscription,
propertyInfo,
NodeId.Parse(itemAttribute.NodeId),
itemAttribute.AttributeId,
itemAttribute.IndexRange,
MonitoringMode.Reporting,
itemAttribute.SamplingInterval,
new EventFilter()
{
SelectClauses = EventHelper.GetSelectClauses(elemType)
},
itemAttribute.QueueSize,
itemAttribute.DiscardOldest));
continue;
}
}
this.Add(new ValueMonitoredItem(
target: subscription,
property: propertyInfo,
nodeId: NodeId.Parse(itemAttribute.NodeId),
indexRange: itemAttribute.IndexRange,
attributeId: itemAttribute.AttributeId,
samplingInterval: itemAttribute.SamplingInterval,
filter: filter,
queueSize: itemAttribute.QueueSize,
discardOldest: itemAttribute.DiscardOldest));
}
}
