public async Task <SimplifiedSchema> GetSchema(int Page = 0, string AccessToken = null, List <ResourcePath> Resources = null)
{
const int MaxResources = 500;
TaskCompletionSource <StanzaIQ> Signal = new TaskCompletionSource <StanzaIQ>();
StanzaIQ Request = new StanzaIQ(StanzaIQ.StanzaIQType.Get);
Request.To = DataSourceAddress;
XElement Payload = new XElement(LWTSD.Namespace + "read-schema");
Payload.SetAttributeValue("format", SchemaFormat.Simplified.GetSerializedValue());
Payload.SetAttributeValue("startindex", Page * MaxResources);
Payload.SetAttributeValue("maxresources", MaxResources);
if (AccessToken != null)
{
XElement AToken = new XElement(LWTSD.Namespace + "accesstoken");
AToken.SetAttributeValue("name", "urn:clayster:cdo:sessionid");
AToken.Value = AccessToken;
Payload.Add(AToken);
}
if (Resources != null)
{
foreach (var res in Resources)
{
XElement Resource = new XElement(LWTSD.Namespace + "resource");
Resource.SetAttributeValue("path", res);
Payload.Add(Resource);
}
}
Request.Payload.Add(Payload);
IQRequests[Request.ID] = Signal;
Uplink.SendStanza(Request);
await Signal.Task;
// Parse signal data
if (Signal.Task.Result == null)
{
throw new Exception("Failed to get schema");
}
XElement ReturnedData = Signal.Task.Result.Payload.Element(LWTSD.Namespace + "simplified-schema");
if (ReturnedData == null)
{
throw new Exception("Failed to get schema");
}
SimplifiedSchema RVal = new SimplifiedSchema(ReturnedData);
return(RVal);
}
public async Task <Tuple <string, DataPage> > SubscribeToData(SimplifiedSchema KnownSchema,
List <ResourcePath> Resources,
Action <Tuple <string, DataPage> > NewDataAction,
Action <string> SubscriptionCancelled,
string AccessToken = null)
{
string SubscriptionID = Guid.NewGuid().ToString();
XElement Payload = new XElement(LWTSD.Namespace + "subscribe");
Payload.SetAttributeValue("subscriptionid", SubscriptionID);
foreach (ResourcePath res in Resources)
{
XElement Trigger = new XElement(LWTSD.Namespace + "trigger");
Trigger.SetAttributeValue("onresource", res);
Payload.Add(Trigger);
}
StanzaIQ Request = new StanzaIQ(StanzaIQ.StanzaIQType.Set);
Request.To = DataSourceAddress;
Subscription NewSubscription = new Subscription();
NewSubscription.ID = SubscriptionID;
NewSubscription.NewData = NewDataAction;
TaskCompletionSource <StanzaIQ> Signal = new TaskCompletionSource <StanzaIQ>();
Request.Payload.Add(Payload);
IQRequests[Request.ID] = Signal;
Uplink.SendStanza(Request);
await Signal.Task;
if (Signal.Task.Result == null)
{
throw new Exception("Failed to subscribe: no data");
}
if (Signal.Task.Result.IQType != StanzaIQ.StanzaIQType.Result)
{
throw new Exception("Subscription failed");
}
DataPage Page = await ReadData(KnownSchema, Resources, AccessToken);
NewSubscription.KnownSchema = Page.Schema;
NewSubscription.Resources = Resources;
NewSubscription.AccessToken = AccessToken;
NewSubscription.SubscriptionCancelled = SubscriptionCancelled;
Subscriptions[NewSubscription.ID] = NewSubscription;
return(new Tuple <string, DataPage>(SubscriptionID, Page));
}
public async Task <DataPage> ReadData(SimplifiedSchema KnownSchema,
List <ResourcePath> Resources,
string AccessToken = null,
int Page = 0)
{
const int NrSchemaMissMatchRetries = 10;
bool SchemaMissMatched = true;
for (int i = 0; i < NrSchemaMissMatchRetries && SchemaMissMatched; i++)
{
SchemaMissMatched = false;
try
{
return(await InnerReadData(KnownSchema, Resources, Page, new List <string>(), AccessToken));
}
catch (DataPage.SchemaMissMatchException)
{
SchemaMissMatched = true;
}
}
throw new Exception("Failed to read data" + (SchemaMissMatched ? ": schema miss matched" : ""));
}
async Task <DataPage> InnerReadData(SimplifiedSchema KnownSchema,
List <ResourcePath> Resources,
int Page = 0,
List <string> ResubscriptionIDs = null,
string AccessToken = null)
{
if (KnownSchema == null)
{
KnownSchema = await GetSchema(0, AccessToken, Resources);
}
TaskCompletionSource <StanzaIQ> Signal = new TaskCompletionSource <StanzaIQ>();
StanzaIQ Request = new StanzaIQ(StanzaIQ.StanzaIQType.Get);
Request.To = DataSourceAddress;
XElement Payload = new XElement(LWTSD.Namespace + "read-data");
Payload.SetAttributeValue("maxpoints", DataPage.PointsPerPage.ToString());
Payload.SetAttributeValue("startindex", (Page * DataPage.PointsPerPage).ToString());
Payload.SetAttributeValue("relativetimeout", "10");
if (AccessToken != null)
{
XElement AToken = new XElement(LWTSD.Namespace + "accesstoken");
AToken.SetAttributeValue("name", "urn:clayster:cdo:sessionid");
AToken.Value = AccessToken;
Payload.Add(AToken);
}
if (ResubscriptionIDs != null)
{
foreach (string sid in ResubscriptionIDs)
{
XElement el = new XElement(LWTSD.Namespace + "re-subscribe");
el.SetAttributeValue("subscriptionid", sid);
Payload.Add(el);
}
}
foreach (ResourcePath Path in Resources)
{
XElement el = new XElement(LWTSD.Namespace + "read");
el.SetAttributeValue("resource-path", Path);
el.SetAttributeValue("maxpoints", "1");
Payload.Add(el);
}
Request.Payload.Add(Payload);
IQRequests[Request.ID] = Signal;
Uplink.SendStanza(Request);
await Signal.Task;
// Parse signal data
if (Signal.Task.Result == null)
{
throw new Exception("Failed to get data: no return value");
}
XElement ReturnedData = Signal.Task.Result.Payload.Element(LWTSD.Namespace + "data");
if (ReturnedData == null)
{
throw new Exception("Failed to get data: invalid data: " + Signal.Task.Result.Payload.ToString());
}
// This is wrong for more than one or two iterations, Need to re-read the data. Recurse?
DataPage RVal = new DataPage(ReturnedData, KnownSchema, Page);
return(RVal);
}
public DataPage()
{
Page = 0;
NrTotalPages = 1;
Schema = null;
}
public DataPage(XElement Element, SimplifiedSchema KnownSchema, int Page)
{
if (KnownSchema == null)
{
throw new SchemaMissMatchException();
}
string NewSchemaVersion = Element.Attribute("schemaversion").Value;
if (NewSchemaVersion != KnownSchema.GetVersion())
{
throw new SchemaMissMatchException();
}
Schema = KnownSchema;
this.NrTotalPages = (int)(((double)Convert.ToInt32(Element.Attribute("totalpoints").Value) + 0.5) / (double)PointsPerPage);
foreach (var it in Element.Elements(LWTSD.Namespace + "resource"))
{
ResourcePath Path = it.Attribute("path").Value;
switch (KnownSchema.Resources[Path].SimpleType)
{
case SimplifiedType.String:
Data.Add(new ResourceString(it));
break;
case SimplifiedType.Integer:
Data.Add(new ResourceInteger(it));
break;
case SimplifiedType.Base64Binary:
Data.Add(new ResourceBase64Binary(it));
break;
case SimplifiedType.DateTime:
Data.Add(new ResourceDateTime(it));
break;
case SimplifiedType.Boolean:
Data.Add(new ResourceBoolean(it));
break;
case SimplifiedType.Decimal:
Data.Add(new ResourceDecimal(it));
break;
case SimplifiedType.Duration:
Data.Add(new ResourceDuration(it));
break;
case SimplifiedType.Float:
Data.Add(new ResourceFloat(it));
break;
case SimplifiedType.Time:
Data.Add(new ResourceTime(it));
break;
case SimplifiedType.Double:
Data.Add(new ResourceDouble(it));
break;
}
}
}
