/// <summary>
/// Returns the original unmodified entity for the provided <paramref name="clientEntity"/>.
/// </summary>
/// <remarks>
/// Note that only members marked with <see cref="RoundtripOriginalAttribute"/> will be set
/// in the returned instance.
/// </remarks>
/// <typeparam name="TEntity">The entity type.</typeparam>
/// <param name="clientEntity">The client modified entity.</param>
/// <returns>The original unmodified entity for the provided <paramref name="clientEntity"/>.</returns>
/// <exception cref="ArgumentNullException">if <paramref name="clientEntity"/> is null.</exception>
/// <exception cref="ArgumentException">if <paramref name="clientEntity"/> is not in the change set.</exception>
public TEntity GetOriginal <TEntity>(TEntity clientEntity) where TEntity : class
{
if (clientEntity == null)
{
throw Error.ArgumentNull("clientEntity");
}
ChangeSetEntry entry = _changeSetEntries.FirstOrDefault(p => Object.ReferenceEquals(p.Entity, clientEntity));
if (entry == null)
{
throw Error.Argument(Resource.ChangeSet_ChangeSetEntryNotFound);
}
if (entry.Operation == ChangeOperation.Insert)
{
throw Error.InvalidOperation(Resource.ChangeSet_OriginalNotValidForInsert);
}
return((TEntity)entry.OriginalEntity);
}
private void InvokeAction(HttpActionDescriptor action, object[] parameters, ChangeSetEntry changeSetEntry)
{
try
{
Collection <HttpParameterDescriptor> pds = action.GetParameters();
Dictionary <string, object> paramMap = new Dictionary <string, object>(pds.Count);
for (int i = 0; i < pds.Count; i++)
{
paramMap.Add(pds[i].ParameterName, parameters[i]);
}
// TODO - Issue #103
// This method is not correctly observing the execution results, the catch block below is wrong.
// Submit should be Task<bool>, not bool, and should model bind for the CancellationToken which would then
// be propagated through to all the helper methods (one or more of which might also need to be made async,
// once we start respecting the fact that the read/write actions should be allowed to be async).
action.ExecuteAsync(ActionContext.ControllerContext, paramMap, CancellationToken.None);
}
catch (TargetInvocationException tie)
{
ValidationException vex = tie.GetBaseException() as ValidationException;
if (vex != null)
{
ValidationResultInfo error = new ValidationResultInfo(vex.Message, 0, String.Empty, vex.ValidationResult.MemberNames);
if (changeSetEntry.ValidationErrors != null)
{
changeSetEntry.ValidationErrors = changeSetEntry.ValidationErrors.Concat(new ValidationResultInfo[] { error }).ToArray();
}
else
{
changeSetEntry.ValidationErrors = new ValidationResultInfo[] { error };
}
}
else
{
throw;
}
}
}
public override Task <object> ExecuteAsync(HttpControllerContext controllerContext, IDictionary <string, object> arguments, CancellationToken cancellationToken)
{
return(TaskHelpers.RunSynchronously <object>(() =>
{
// create the changeset
object entity = arguments.Single().Value; // there is only a single parameter - the entity being submitted
ChangeSetEntry[] changeSetEntries = new ChangeSetEntry[]
{
new ChangeSetEntry
{
Id = 1,
ActionDescriptor = _updateAction,
Entity = entity,
Operation = _updateAction.ChangeOperation
}
};
ChangeSet changeSet = new ChangeSet(changeSetEntries);
changeSet.SetEntityAssociations();
DomainController controller = (DomainController)controllerContext.Controller;
if (!controller.Submit(changeSet) &&
controller.ActionContext.Response != null)
{
// If the submit failed due to an authorization failure,
// return the authorization response directly
return controller.ActionContext.Response;
}
// return the entity
entity = changeSet.ChangeSetEntries[0].Entity;
// REVIEW does JSON make sense here?
return new HttpResponseMessage()
{
Content = new ObjectContent(_updateAction.EntityType, entity, new JsonMediaTypeFormatter())
};
}, cancellationToken));
}
/// <summary>
/// This method invokes the user overridable <see cref="PersistChangeSet"/> method wrapping the call
/// with the appropriate exception handling logic. All framework calls to <see cref="PersistChangeSet"/>
/// must go through this method. Some data sources have their own validation hook points,
/// so if a <see cref="ValidationException"/> is thrown at that level, we want to capture it.
/// </summary>
/// <returns>True if the <see cref="ChangeSet"/> was persisted successfully, false otherwise.</returns>
private bool PersistChangeSetInternal()
{
try
{
PersistChangeSet();
}
catch (ValidationException e)
{
// if a validation exception is thrown for one of the entities in the changeset
// set the error on the corresponding ChangeSetEntry
if (e.Value != null && e.ValidationResult != null)
{
IEnumerable <ChangeSetEntry> updateOperations =
ChangeSet.ChangeSetEntries.Where(
p => p.Operation == ChangeOperation.Insert ||
p.Operation == ChangeOperation.Update ||
p.Operation == ChangeOperation.Delete);
ChangeSetEntry operation = updateOperations.SingleOrDefault(p => Object.ReferenceEquals(p.Entity, e.Value));
if (operation != null)
{
ValidationResultInfo error = new ValidationResultInfo(e.ValidationResult.ErrorMessage, e.ValidationResult.MemberNames);
error.StackTrace = e.StackTrace;
operation.ValidationErrors = new List <ValidationResultInfo>()
{
error
};
}
}
else
{
throw;
}
}
return(!ChangeSet.HasError);
}
public override Task<object> ExecuteAsync(HttpControllerContext controllerContext, IDictionary<string, object> arguments, CancellationToken cancellationToken)
{
return TaskHelpers.RunSynchronously<object>(() =>
{
// create the changeset
object entity = arguments.Single().Value; // there is only a single parameter - the entity being submitted
ChangeSetEntry[] changeSetEntries = new ChangeSetEntry[]
{
new ChangeSetEntry
{
Id = 1,
ActionDescriptor = _updateAction,
Entity = entity,
Operation = _updateAction.ChangeOperation
}
};
ChangeSet changeSet = new ChangeSet(changeSetEntries);
changeSet.SetEntityAssociations();
DomainController controller = (DomainController)controllerContext.Controller;
if (!controller.Submit(changeSet) &&
controller.ActionContext.Response != null)
{
// If the submit failed due to an authorization failure,
// return the authorization response directly
return controller.ActionContext.Response;
}
// return the entity
entity = changeSet.ChangeSetEntries[0].Entity;
// REVIEW does JSON make sense here?
return new HttpResponseMessage()
{
Content = new ObjectContent(_updateAction.EntityType, entity, new JsonMediaTypeFormatter())
};
}, cancellationToken);
}
private void InvokeAction(HttpActionDescriptor action, object[] parameters, ChangeSetEntry changeSetEntry)
{
try
{
Collection<HttpParameterDescriptor> pds = action.GetParameters();
Dictionary<string, object> paramMap = new Dictionary<string, object>(pds.Count);
for (int i = 0; i < pds.Count; i++)
{
paramMap.Add(pds[i].ParameterName, parameters[i]);
}
// TODO - Issue #103
// This method is not correctly observing the execution results, the catch block below is wrong.
// Submit should be Task<bool>, not bool, and should model bind for the CancellationToken which would then
// be propagated through to all the helper methods (one or more of which might also need to be made async,
// once we start respecting the fact that the read/write actions should be allowed to be async).
action.ExecuteAsync(ActionContext.ControllerContext, paramMap, CancellationToken.None);
}
catch (TargetInvocationException tie)
{
ValidationException vex = tie.GetBaseException() as ValidationException;
if (vex != null)
{
ValidationResultInfo error = new ValidationResultInfo(vex.Message, 0, String.Empty, vex.ValidationResult.MemberNames);
if (changeSetEntry.ValidationErrors != null)
{
changeSetEntry.ValidationErrors = changeSetEntry.ValidationErrors.Concat(new ValidationResultInfo[] { error }).ToArray();
}
else
{
changeSetEntry.ValidationErrors = new ValidationResultInfo[] { error };
}
}
else
{
throw;
}
}
}
