private void OnPropertyChanged(object sender, PropertyChangedEventArgs e)
{
this.client.VerifyAccess();
this.client.VerifyConnected();
// Check if object is ignored
if (this.IgnoreChanges)
{
return;
}
if (!this.IsDynamic && this.IsIgnoredProperty(e.PropertyName))
{
return;
}
// Check if object is connected
if (!this.IsConnected)
{
throw new InvalidOperationException("Changes cannot be made to this named object until it is connected with the server");
}
// Try to extract property information
SharedProperty property;
// If dynamic, pull value from dictionary
object dynamicVal = null;
if (this.IsDynamic)
{
var dictionary = this.Object as IDictionary<string, object>;
if (!dictionary.TryGetValue(e.PropertyName, out dynamicVal))
{
throw new ArgumentException("Dictionary doesn't contains the value: " + e.PropertyName);
}
}
if (!this.Properties.TryGetValue(e.PropertyName, out property))
{
if (this.IsDynamic)
{
// Add new property if dynamic
if (dynamicVal != null)
{
property = new SharedProperty()
{
Attributes = new SharedAttributes(),
Index = -1,
ETag = new ETag(this.client.ClientId),
Name = e.PropertyName,
PropertyType = DynamicTypeMapping.Instance.GetValueFromType(dynamicVal.GetType())
};
}
}
if (property == null)
{
throw new ArgumentException("Dictionary doesn't contains the value: " + e.PropertyName);
}
}
// Throw exception if property cannot be updated by the client
if (property.IsServerAppliedProperty())
{
throw new InvalidOperationException("Client cannot modify properties with server-applied attributes");
}
// Create payload
PropertyChangedPayload data = new PropertyChangedPayload(this.client.ClientId, property.Index, this.Id, property.ETag, this.IsDynamic ? dynamicVal : this.Object.GetPropertyValue(e.PropertyName));
if (this.IsDynamic)
{
data.PropertyName = e.PropertyName;
// Property type might change, we need to re-get each time
data.PropertyType = DynamicTypeMapping.Instance.GetValueFromType(dynamicVal.GetType());
}
// Add to pending update list
property.LocalUpdates.Add(new PropertyUpdateOperation() { Payload = data, ReapplyUpdate = false });
// Send to server
this.client.SendPublishEvent(data);
}
public bool IsStudentProgressReportProperty(PropertyChangedPayload<IStudentInformationService> payload)
{
return payload.PropertyName == "StudentProgressReport";
}
private void UpdateSharedObject(PropertyChangedPayload data)
{
Debug.Assert(this.client.CheckAccess());
ObjectEntry entry = null;
try
{
if (!this.TryGetValue(data.ObjectId, out entry))
{
// Received update for an object we are not tracking
Debug.WriteLine("[PropertyChanged] Missing shared object for update in incoming event.");
return;
}
SharedProperty property = entry.IsDynamic ? entry.Properties[data.PropertyName] : entry.Properties[data.PropertyIndex];
// In case of dynamic properties, this could be the first time this property is seen
if (property == null && entry.IsDynamic)
{
property = new SharedProperty()
{
Attributes = new SharedAttributes(),
Index = (short)entry.Properties.Count,
Name = data.PropertyName,
ETag = new ETag(this.client.ClientId),
PropertyType = data.PropertyType
};
entry.Properties.Add(property.Index, property);
}
// Ignore changes for given object, add to list
entry.IgnoreChanges = true;
// Don't apply update if we made it locally
bool applyUpdate = data.ClientId != this.client.ClientId;
bool conflictDetected = false;
PropertyUpdateOperation matchingUpdate = property.LocalUpdates.Where(x => x.Payload.Equals(data)).FirstOrDefault();
if (matchingUpdate != null)
{
// Remove update from pending list
Debug.WriteLine("[PropertyChanged] Received acknowledgement of matching property update");
if (matchingUpdate.ReapplyUpdate)
{
applyUpdate = true;
}
property.LocalUpdates.Remove(matchingUpdate);
}
// Check for conflict, but won't stop us from applying update
conflictDetected = data.IsConflict(property.LocalUpdates) &&
!property.IsServerAppliedProperty() && (property.Attributes.ConcurrencyAttribute != ConcurrencyPolicy.Overwrite);
if (applyUpdate)
{
// Mark pending updates to re-apply if we are applying a change from another endpoint
if (data.ClientId != this.client.ClientId)
{
property.LocalUpdates.ForEach(x => x.ReapplyUpdate = true);
}
if (entry.IsDynamic)
{
var dictionary = entry.Object as IDictionary <string, object>;
if (dictionary == null)
{
throw new ArgumentException("Dictionary is null");
}
// Insert up-to-date value for property
dictionary[data.PropertyName] = Json.ReadObject(DynamicTypeMapping.Instance.GetTypeFromValue(data.PropertyType), data.PropertyValue);
}
else
{
Json.AssignProperty(entry.Object, property.Name, data.PropertyValue);
}
property.Value = data.PropertyValue;
}
property.ETag = data.ETag;
if (conflictDetected)
{
Debug.WriteLine("[PropertyChanged] Conflict detected on property update");
IEnumerable <PropertyChangedPayload> rejectedUpdates = property.LocalUpdates.Select(x => x.Payload);
if (property.Attributes.ConcurrencyAttribute == ConcurrencyPolicy.RejectAndNotify)
{
var notify = new ConcurrencyUpdateRejectedEventArgs(entry.Object, property.Name, rejectedUpdates.Select(x => Json.ReadProperty(entry.Object, property.Name, x.PropertyValue)));
this.client.RaiseError(notify);
}
property.LocalUpdates.Clear();
}
}
finally
{
if (entry != null)
{
entry.IgnoreChanges = false;
}
}
}
public void StudentProgressReportChanged(PropertyChangedPayload<IStudentInformationService> payload)
{
AssignStudentProgressReport(payload.Sender);
}
private void OnPropertyChanged(object sender, PropertyChangedEventArgs e)
{
this.client.VerifyAccess();
this.client.VerifyConnected();
// Check if object is ignored
if (this.IgnoreChanges)
{
return;
}
if (!this.IsDynamic && this.IsIgnoredProperty(e.PropertyName))
{
return;
}
// Check if object is connected
if (!this.IsConnected)
{
throw new InvalidOperationException("Changes cannot be made to this named object until it is connected with the server");
}
// Try to extract property information
SharedProperty property;
// If dynamic, pull value from dictionary
object dynamicVal = null;
if (this.IsDynamic)
{
var dictionary = this.Object as IDictionary <string, object>;
if (!dictionary.TryGetValue(e.PropertyName, out dynamicVal))
{
throw new ArgumentException("Dictionary doesn't contains the value: " + e.PropertyName);
}
}
if (!this.Properties.TryGetValue(e.PropertyName, out property))
{
if (this.IsDynamic)
{
// Add new property if dynamic
if (dynamicVal != null)
{
property = new SharedProperty()
{
Attributes = new SharedAttributes(),
Index = -1,
ETag = new ETag(this.client.ClientId),
Name = e.PropertyName,
PropertyType = DynamicTypeMapping.Instance.GetValueFromType(dynamicVal.GetType())
};
}
}
if (property == null)
{
throw new ArgumentException("Dictionary doesn't contains the value: " + e.PropertyName);
}
}
// Throw exception if property cannot be updated by the client
if (property.IsServerAppliedProperty())
{
throw new InvalidOperationException("Client cannot modify properties with server-applied attributes");
}
// Create payload
PropertyChangedPayload data = new PropertyChangedPayload(this.client.ClientId, property.Index, this.Id, property.ETag, this.IsDynamic ? dynamicVal : this.Object.GetPropertyValue(e.PropertyName));
if (this.IsDynamic)
{
data.PropertyName = e.PropertyName;
// Property type might change, we need to re-get each time
data.PropertyType = DynamicTypeMapping.Instance.GetValueFromType(dynamicVal.GetType());
}
// Add to pending update list
property.LocalUpdates.Add(new PropertyUpdateOperation()
{
Payload = data, ReapplyUpdate = false
});
// Send to server
this.client.SendPublishEvent(data);
}