public static DuplexStreamMessage CreateSubscribeResponse(DuplexCallbackId id, int clientSubscriptionId, StreamQbservableProtocol protocol)
{
Contract.Requires(protocol != null);
Contract.Ensures(Contract.Result <DuplexStreamMessage>() != null);
return(new DuplexStreamMessage(QbservableProtocolMessageKind.DuplexSubscribeResponse, id, clientSubscriptionId, Serialize(id, clientSubscriptionId, protocol)));
}
public virtual async void SendOnNext(string name, DuplexCallbackId id, object value)
{
#if TRACE
var sourceId = GetSourceId(id);
Log.OnNext(name, value, false, false, sourceId, LogMessages.Sending);
#endif
try
{
await Protocol.SendMessageSafeAsync(CreateOnNext(id, value)).ConfigureAwait(false);
}
catch (SerializationException ex)
{
SendOnError(name, id, ExceptionDispatchInfo.Capture(ex));
}
catch (Exception ex)
{
if (Protocol.ServiceOptions.SendServerErrorsToClients)
{
SendOnError(name, id, ExceptionDispatchInfo.Capture(ex));
}
else
{
Fail(ExceptionDispatchInfo.Capture(ex));
}
}
}
public static DuplexStreamMessage CreateOnCompleted(DuplexCallbackId id, StreamQbservableProtocol protocol)
{
Contract.Requires(protocol != null);
Contract.Ensures(Contract.Result <DuplexStreamMessage>() != null);
return(CreateWithoutValue(QbservableProtocolMessageKind.DuplexOnCompleted, id, protocol));
}
protected void MoveNext(DuplexCallbackId id)
{
var enumerator = GetEnumerator(id.ClientId);
object current;
bool result;
try
{
if (enumerator != null && enumerator.MoveNext())
{
result = true;
current = enumerator.Current;
}
else
{
result = false;
current = null;
}
}
catch (Exception ex)
{
SendEnumeratorError(id, ex);
return;
}
SendEnumeratorResponse(id, result, current);
}
public Tuple <DuplexCallbackId, IDisposable> RegisterObservableCallbacks(int clientId, Action <object> onNext, Action <Exception> onError, Action onCompleted, Action <int> dispose)
{
var serverId = Interlocked.Increment(ref lastObservableId);
var id = new DuplexCallbackId(clientId, serverId);
var actions = Tuple.Create(onNext, onError, onCompleted, dispose);
if (!observableCallbacks.TryAdd(id, actions))
{
throw new InvalidOperationException(Errors.ProtocolDuplicateDuplexIdForObservable);
}
return(Tuple.Create(
id,
Disposable.Create(() =>
{
lock (actions)
{
int?clientSubscriptionId = null;
if (TryGetOrAddSubscriptionOneTime(id, ref clientSubscriptionId))
{
Contract.Assume(clientSubscriptionId.HasValue); // Disposable.Create ensures that this code only runs once
actions.Item4(clientSubscriptionId.Value);
}
}
})));
}
protected void GetEnumerator(DuplexCallbackId id)
{
var enumerable = GetEnumerable(id.ClientId);
#if TRACE
var sourceId = GetSourceId(id);
Log.Enumerating(enumerable.Name, false, sourceId, LogMessages.Received);
#endif
IEnumerator enumerator;
try
{
enumerator = enumerable.GetEnumerator();
}
catch (Exception ex)
{
SendGetEnumeratorError(id, ExceptionDispatchInfo.Capture(ex));
return;
}
var enumeratorId = RegisterEnumerator(new NamedEnumerator(enumerable.Name, enumerator));
SendGetEnumeratorResponse(id, enumeratorId);
}
public static DuplexStreamMessage CreateInvoke(DuplexCallbackId id, object[] arguments, StreamQbservableProtocol protocol)
{
Contract.Requires(protocol != null);
Contract.Ensures(Contract.Result <DuplexStreamMessage>() != null);
return(new DuplexStreamMessage(QbservableProtocolMessageKind.DuplexInvoke, id, arguments, Serialize(id, arguments, protocol)));
}
public void SendOnError(string name, DuplexCallbackId id, ExceptionDispatchInfo error)
{
#if TRACE
Contract.Requires(!string.IsNullOrEmpty(name));
#endif
Contract.Requires(error != null);
}
protected void Subscribe(DuplexCallbackId id)
{
Func <int, IDisposable> subscribe;
if (!obsevableCallbacks.TryGetValue(id.ClientId, out subscribe))
{
throw new InvalidOperationException(Errors.ProtocolInvalidDuplexId);
}
var subscription = new SingleAssignmentDisposable();
var subscriptionId = RegisterSubscription(subscription);
try
{
subscription.Disposable = subscribe(id.ServerId);
}
catch (Exception ex)
{
SendOnError(id, ex);
return;
}
SendSubscribeResponse(id, subscriptionId);
}
public static DuplexStreamMessage CreateOnNext(DuplexCallbackId id, object value, StreamQbservableProtocol protocol)
{
Contract.Requires(protocol != null);
Contract.Ensures(Contract.Result <DuplexStreamMessage>() != null);
return(new DuplexStreamMessage(QbservableProtocolMessageKind.DuplexOnNext, id, value, Serialize(id, value, protocol)));
}
private DuplexStreamMessage(QbservableProtocolMessageKind kind, DuplexCallbackId id, ExceptionDispatchInfo error, byte[] data)
: base(kind, data, data.Length)
{
Contract.Requires(error != null);
Id = id;
Error = error;
}
public static DuplexStreamMessage CreateOnError(DuplexCallbackId id, ExceptionDispatchInfo error, StreamQbservableProtocol protocol)
{
Contract.Requires(error != null);
Contract.Requires(protocol != null);
Contract.Ensures(Contract.Result <DuplexStreamMessage>() != null);
return(new DuplexStreamMessage(QbservableProtocolMessageKind.DuplexOnError, id, error, Serialize(id, error.SourceException, protocol)));
}
public static DuplexStreamMessage CreateEnumeratorResponse(DuplexCallbackId id, bool result, object current, StreamQbservableProtocol protocol)
{
Contract.Requires(protocol != null);
Contract.Ensures(Contract.Result <DuplexStreamMessage>() != null);
var value = Tuple.Create(result, current);
return(new DuplexStreamMessage(QbservableProtocolMessageKind.DuplexEnumeratorResponse, id, value, Serialize(id, value, protocol)));
}
private DuplexStreamMessage(QbservableProtocolMessageKind kind, DuplexCallbackId id, object value, byte[] data, long length)
: base(kind, data, length)
{
Contract.Requires(length >= 0);
Contract.Requires(length == 0 || data != null);
Contract.Requires(length == 0 || data.Length >= length);
Id = id;
Value = value;
}
private Tuple <Action <object>, Action <Exception> > GetEnumeratorCallbacks(DuplexCallbackId id)
{
Tuple <Action <object>, Action <Exception> > actions;
if (!enumeratorCallbacks.TryGetValue(id, out actions))
{
throw new InvalidOperationException(Errors.ProtocolInvalidDuplexIdForEnumerator);
}
return(actions);
}
protected virtual async void SendError(DuplexCallbackId id, ExceptionDispatchInfo error)
{
try
{
await Protocol.SendMessageSafeAsync(CreateErrorResponse(id, error)).ConfigureAwait(false);
}
catch (Exception ex)
{
Fail(ExceptionDispatchInfo.Capture(ex));
}
}
protected virtual async void SendEnumeratorResponse(DuplexCallbackId id, bool result, object current)
{
try
{
await Protocol.SendMessageSafeAsync(CreateEnumeratorResponse(id, result, current)).ConfigureAwait(false);
}
catch (Exception ex)
{
Fail(ExceptionDispatchInfo.Capture(ex));
}
}
protected virtual async void SendGetEnumeratorResponse(DuplexCallbackId id, int clientEnumeratorId)
{
try
{
await Protocol.SendMessageSafeAsync(CreateGetEnumeratorResponse(id, clientEnumeratorId)).ConfigureAwait(false);
}
catch (Exception ex)
{
Fail(ExceptionDispatchInfo.Capture(ex));
}
}
public DuplexCallbackId RegisterEnumeratorCallback(int clientId, Action <object> callback, Action <Exception> onError)
{
var serverId = Interlocked.Increment(ref lastEnumeratorId);
var id = new DuplexCallbackId(clientId, serverId);
if (!enumeratorCallbacks.TryAdd(id, Tuple.Create(callback, onError)))
{
throw new InvalidOperationException(Errors.ProtocolDuplicateDuplexIdForEnumerator);
}
return(id);
}
protected void ResetEnumerator(DuplexCallbackId id)
{
var enumerator = GetEnumerator(id.ClientId);
try
{
enumerator.Reset();
}
catch (Exception ex)
{
SendEnumeratorError(id, ex);
}
}
protected virtual async void SendEnumeratorError(DuplexCallbackId id, ExceptionDispatchInfo error)
{
Contract.Requires(error != null);
try
{
await Protocol.SendMessageSafeAsync(CreateEnumeratorError(id, error)).ConfigureAwait(false);
}
catch (Exception ex)
{
Fail(ExceptionDispatchInfo.Capture(ex));
}
}
private static byte[] Serialize(DuplexCallbackId id, object value, QbservableProtocol protocol)
{
var idData = BitConverter.GetBytes(id);
long serializedDataLength;
var serializedData = protocol.Serialize(value, out serializedDataLength);
var data = new byte[idData.Length + serializedDataLength];
Array.Copy(idData, data, idData.Length);
Array.Copy(serializedData, 0, data, idData.Length, serializedDataLength);
return(data);
}
private void TryInvokeObservableCallback(
DuplexCallbackId id,
Action <Tuple <Action <object>, Action <Exception>, Action, Action <int> > > action)
{
Tuple <Action <object>, Action <Exception>, Action, Action <int> > callbacks;
if (observableCallbacks.TryGetValue(id, out callbacks))
{
action(callbacks);
}
/* It's acceptable for the callbacks to be missing due to a race condition between the
* client sending notifications and the server disposing of the subscription, which causes
* the callbacks to be removed.
*/
}
private static byte[] Serialize(DuplexCallbackId id, object value, StreamQbservableProtocol protocol)
{
Contract.Requires(protocol != null);
Contract.Ensures(Contract.Result <byte[]>() != null);
var idData = BitConverter.GetBytes(id);
long serializedDataLength;
var serializedData = protocol.Serialize(value, out serializedDataLength);
var data = new byte[idData.Length + serializedDataLength];
Array.Copy(idData, data, idData.Length);
Array.Copy(serializedData, 0, data, idData.Length, serializedDataLength);
return(data);
}
protected void DisposeEnumerator(DuplexCallbackId id)
{
var enumerator = GetEnumerator(id.ClientId);
#if TRACE
var sourceId = GetSourceId(id);
Log.Enumerated(enumerator.Name, false, sourceId, LogMessages.Received);
#endif
var disposable = enumerator.Decorated as IDisposable;
if (disposable != null)
{
disposable.Dispose();
}
}
public virtual async void SendOnCompleted(string name, DuplexCallbackId id)
{
#if TRACE
var sourceId = GetSourceId(id);
Log.OnCompleted(name, false, false, sourceId, LogMessages.Sending);
#endif
try
{
await Protocol.SendMessageSafeAsync(CreateOnCompleted(id)).ConfigureAwait(false);
}
catch (Exception ex)
{
Fail(ExceptionDispatchInfo.Capture(ex));
}
}
private bool TryGetOrAddSubscriptionOneTime(DuplexCallbackId id, ref int?clientSubscriptionId)
{
int?s;
if (subscriptions.TryGetValue(id, out s))
{
subscriptions.Remove(id);
clientSubscriptionId = s;
return(true);
}
else
{
subscriptions.Add(id, clientSubscriptionId);
}
return(false);
}
protected void MoveNext(DuplexCallbackId id)
{
var enumerator = GetEnumerator(id.ClientId);
#if TRACE
var sourceId = GetSourceId(id);
if (enumerator != null)
{
Log.MoveNext(enumerator.Name, false, sourceId, LogMessages.Received);
}
#endif
object current;
bool result;
try
{
if (enumerator != null && enumerator.MoveNext())
{
result = true;
current = enumerator.Current;
}
else
{
result = false;
current = null;
}
}
catch (Exception ex)
{
SendEnumeratorError(id, ExceptionDispatchInfo.Capture(ex));
return;
}
#if TRACE
if (result)
{
Log.Current(enumerator.Name, current, false, sourceId, LogMessages.Sending);
}
#endif
SendEnumeratorResponse(id, result, current);
}
protected void GetEnumerator(DuplexCallbackId id)
{
var enumerable = GetEnumerable(id.ClientId);
IEnumerator enumerator;
try
{
enumerator = enumerable();
}
catch (Exception ex)
{
SendGetEnumeratorError(id, ex);
return;
}
var enumeratorId = RegisterEnumerator(enumerator);
SendGetEnumeratorResponse(id, enumeratorId);
}
protected void Invoke(DuplexCallbackId id, object[] arguments)
{
Contract.Requires(arguments != null);
IInvokeDuplexCallback callback;
if (!invokeCallbacks.TryGetValue(id.ClientId, out callback))
{
throw new InvalidOperationException(Errors.ProtocolInvalidDuplexId);
}
#if TRACE
var sourceId = GetSourceId(id);
Log.Invoking(callback.Name, arguments, false, sourceId, LogMessages.Received);
#endif
object result;
try
{
result = callback.Invoke(arguments);
}
catch (Exception ex)
{
SendError(id, ExceptionDispatchInfo.Capture(ex));
return;
}
var duplex = result as DuplexCallback;
if (duplex != null)
{
duplex.SetClientProtocol(Protocol);
}
#if TRACE
Log.Invoked(callback.Name, arguments, result, false, sourceId, LogMessages.Sending);
#endif
SendResponse(id, result);
}
