/// <summary>
/// Gets the set of property values to be serialized for the current instance
/// </summary>
/// <returns></returns>
IEnumerator <object> IEnumerable <object> .GetEnumerator()
{
return(Instance.Type.Properties
.Where(property => ExoWeb.IncludeInClientModel(property) && !property.IsStatic)
.Select(property => property.IsList && !HasList(property) ? "?" : JsonConverter.GetPropertyValue(property, Instance))
.GetEnumerator());
}
/// <summary>
/// Raises domain events.
/// </summary>
void RaiseEvents(ServiceResponse response, ModelTransaction transaction)
{
// Process each event in the request
if (Events != null)
{
response.Events = Events
.Select((domainEvent) =>
{
// Restore the instance to be a valid model instance
if (domainEvent.Instance != null)
{
if (transaction != null)
{
domainEvent.Instance = transaction.GetInstance(domainEvent.Instance.Type, domainEvent.Instance.Id);
}
else
{
domainEvent.Instance = domainEvent.Instance.Type.Create(domainEvent.Instance.Id);
}
}
var result = domainEvent.Raise(transaction);
if (result == null)
{
return(null);
}
ModelType type;
ModelInstance[] roots;
bool isList;
if (ExoWeb.TryConvertQueryInstance(result, out type, out roots, out isList))
{
Query newQuery = new Query(type, roots, true, isList, domainEvent.Include);
newQuery.Prepare(response);
Query[] newQueries = new Query[] { newQuery };
Queries = Queries == null ? newQueries : Queries.Union(newQueries).ToArray();
return(isList ? (object)roots : (object)roots[0]);
}
else if (domainEvent.Include != null && domainEvent.Include.Length > 0)
{
Query newQuery = new Query(domainEvent.Instance.Type, new[] { domainEvent.Instance }, true, false, domainEvent.Include);
newQuery.Prepare(response);
Query[] newQueries = new Query[] { newQuery };
Queries = Queries == null ? newQueries : Queries.Union(newQueries).ToArray();
return(result);
}
else
{
return(result);
}
})
.ToArray();
}
}
/// <summary>
/// Creates a query to load an instance and a set of options paths.
/// </summary>
/// <param name="instance"></param>
/// <param name="scope"></param>
/// <param name="paths"></param>
/// <returns></returns>
public static ServiceRequest.Query Query(object instance, ViewScope scope, params string[] paths)
{
ModelType type;
ModelInstance[] roots;
bool isList;
if (ExoWeb.TryConvertQueryInstance(instance, out type, out roots, out isList))
{
return(new ServiceRequest.Query(type, roots, scope == ViewScope.InScope, isList, paths));
}
else
{
return(null);
}
}
public static string ProcessRequest(string json)
{
return(JsonUtility.Serialize(ExoWeb.FromJson <ServiceRequest>(json).Invoke(null)));
}
/// <summary>
/// Outputs the JSON for the specified instance to the response stream.
/// </summary>
/// <param name="response"></param>
internal ServiceResponse Invoke(ModelTransaction initChanges)
{
// Raise the begin request event
ExoWeb.OnBeginRequest(this);
// Create a response for the request
ServiceResponse response = new ServiceResponse();
response.ServerInfo = new ServerInformation();
response.Changes = initChanges;
try
{
// Set the types to return from the request
response.Types = Types;
// Apply view initialization changes
if (Changes != null && Changes.Length > 0 && Changes[0].Source == ChangeSource.Init)
{
response.Changes = Changes[0].Changes;
response.Changes.Perform();
}
// Load root instances
if (Queries != null)
{
foreach (var query in Queries)
{
query.Prepare(response);
query.LoadRoots(response.Changes);
}
}
// Preload the scope of work before applying changes
PerformQueries(response, false, initChanges != null);
// Apply additional changes and raise domain events
ApplyChanges(response);
// Load instances specified by load queries
PerformQueries(response, true, initChanges != null);
// Condense the transaction log
if (response.Changes != null)
{
response.Changes.Condense();
}
// Send conditions for instances loaded in the request
if (response.Instances != null || response.Changes != null)
{
// Add instances created during the request
if (response.Changes != null)
{
foreach (var instance in response.Changes.OfType <ModelInitEvent.InitNew>().Select(modelEvent => modelEvent.Instance))
{
response.inScopeInstances.Add(instance);
}
}
// Ensure conditions are evaluated before extracting them
ExoWeb.OnEnsureConditions(response, response.inScopeInstances);
// Extract conditions for all instances involved in the request
Dictionary <string, List <Condition> > conditionsByType = new Dictionary <string, List <Condition> >();
foreach (var condition in response.inScopeInstances.SelectMany(instance => Condition.GetConditions(instance)))
{
List <Condition> conditions;
if (!conditionsByType.TryGetValue(condition.Type.Code, out conditions))
{
conditionsByType[condition.Type.Code] = conditions = new List <Condition>();
}
if (!conditions.Contains(condition))
{
conditions.Add(condition);
}
}
response.Conditions = conditionsByType;
}
}
finally
{
// Raise the end request event
ExoWeb.OnEndRequest(this, response);
}
// Return the response
return(response);
}
void IJsonSerializable.Serialize(JsonWriter writer)
{
// Types
if (Types != null && Types.Any())
{
writer.WritePropertyName("types");
writer.WriteStartObject();
foreach (var type in Types)
{
writer.WritePropertyName(type);
writer.WriteRawValue(GetTypeJson(type));
}
writer.WriteEndObject();
}
if (Instances != null && Instances.Any())
{
writer.WritePropertyName("instances");
writer.WriteStartObject();
foreach (var typeItem in Instances)
{
writer.WritePropertyName(typeItem.Key);
writer.WriteStartObject();
// Serialize static property values
if (typeItem.Value.StaticProperties.Count > 0)
{
writer.WritePropertyName("static");
writer.Serialize(
typeItem.Value.StaticProperties.ToDictionary(
property => property.Name,
property => JsonConverter.GetPropertyValue(property, property.DeclaringType)));
}
// Serialize instances
foreach (var instanceItem in typeItem.Value.Instances)
{
writer.WritePropertyName(instanceItem.Key);
writer.Serialize(instanceItem.Value);
}
writer.WriteEndObject();
}
writer.WriteEndObject();
}
if (Conditions != null && Conditions.Any())
{
writer.WritePropertyName("conditions");
writer.Serialize(Conditions);
}
if (Events != null && Events.Any())
{
writer.WritePropertyName("events");
writer.Serialize(Events);
}
if (Model != null && Model.Any())
{
writer.WritePropertyName("model");
writer.Serialize(Model);
}
if (ServerInfo != null)
{
writer.WritePropertyName("serverInfo");
writer.Serialize(ServerInfo);
}
if (Changes != null && Changes.Any())
{
writer.WritePropertyName("changes");
writer.Serialize(Changes.Where(modelEvent => !(modelEvent is ModelValueChangeEvent) || ExoWeb.IncludeInClientModel(((ModelValueChangeEvent)modelEvent).Property)));
}
}
/// <summary>
/// Processes incoming requests and routes them to the appropriate JSON handler method.
/// </summary>
/// <param name="context"></param>
void IHttpHandler.ProcessRequest(HttpContext context)
{
IsExecuting = true;
try
{
// Perform the requested operation
switch (context.Request.PathInfo)
{
case "/GetType":
// Enable response caching
context.Response.Cache.SetCacheability(HttpCacheability.Public);
context.Response.Cache.SetExpires(DateTime.Now.AddDays(7));
context.Response.Cache.SetMaxAge(TimeSpan.FromDays(7));
// Output the type metadata
context.Response.ContentType = "application/json";
JsonUtility.Serialize(context.Response.OutputStream, new ServiceRequest(context.Request.QueryString["type"].Replace("\"", "")).Invoke(null));
break;
case "/LogError":
// Raise the error event
context.Response.ContentType = "application/json";
ExoWeb.OnError(JsonUtility.Deserialize <ServiceError>(context.Request.InputStream));
break;
default:
// Deserialize the request
context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
context.Response.Cache.SetNoStore();
ServiceRequest request = JsonUtility.Deserialize <ServiceRequest>(context.Request.InputStream);
// Invoke the request and output the response
context.Response.ContentType = "application/json";
using (var test = new StringWriter())
{
JsonUtility.Serialize(test, request.Invoke(null));
context.Response.Write(test.ToString());
}
break;
}
}
catch (Exception e)
{
// look for an ExoModel.ModelException that may display a more
// abstracted or informative message in the UI. Otherwise, use
// the inner most exception
Exception reported = e;
for (Exception x = e; x != null; x = x.InnerException)
{
reported = x;
if (x is ModelException)
{
break;
}
}
// Create an error to log
var error = new ServiceError();
error.Type = reported.GetType().FullName;
error.StackTrace = GetFullStackTrace(e);
error.Message = reported.Message;
error.Url = context.Request.RawUrl;
if (error.AdditionalInfo == null)
{
error.AdditionalInfo = new Dictionary <string, object>();
}
//error.AdditionalInfo.Add("Client.RequestJson", json);
// Raise the error event
ExoWeb.OnError(error);
// Also send the error information to the client
context.Response.Clear();
context.Response.ContentType = "application/json";
context.Response.StatusCode = 500; // internal server error
// Enable error information on client
if (ExoWeb.EnableExceptionInformation)
{
context.Response.AddHeader("jsonerror", "true");
// Ensure IIS 7 doesn't intercept the error
context.Response.TrySkipIisCustomErrors = true;
}
context.Response.Write(ExoWeb.ToJson(error));
}
}
