/// <summary>
/// Notifies the connected digital shelf/shelves when a shopping cart has been manipulated in the It-System.
/// </summary>
/// <param name="shoppingCart">The shopping cart that has been manipulated.</param>
/// <returns><c>true</c> if the shopping cart update message was sent successfully, <c>false</c> otherwise.</returns>
public bool UpdateShoppingCart(IShoppingCart shoppingCart)
{
if (shoppingCart == null)
{
throw new ArgumentException("No shopping cart specified.");
}
if (!this.Connected)
{
throw new InvalidOperationException("The digital shelf is currently not connected.");
}
var message = new ShoppingCartUpdateMessageEnvelope()
{
ShoppingCartUpdateMessage = new ShoppingCartUpdateMessage()
{
Id = MessageId.Next,
Destination = _destinationId,
Source = SubscriberID,
ShoppingCart = (ShoppingCart)shoppingCart
}
};
if (!_messageObjectStream.Write(message))
{
throw new ApplicationException("Sending 'ShoppingCartUpdateMessage' to digital shelf failed.");
}
return(true);
}
/// <summary>
/// Sends the specified message envelope and waits for the response in form of the specified message type.
/// </summary>
/// <param name="messageEnvelope">The message envelope to send.</param>
/// <param name="messageId">The message identifier to use while waiting for the response.</param>
/// <param name="responseType">The type of the response message to wait for.</param>
/// <param name="waitTimeoutMilliseconds">The wait timeout milliseconds.</param>
/// <returns>
/// Requested response message if it was received; null otherwise.
/// </returns>
public MessageBase SendAndWaitForResponse(object messageEnvelope,
string messageId,
Type responseType,
int waitTimeoutMilliseconds = 0)
{
if (messageEnvelope == null)
{
throw new ArgumentException("Invalid messageEnvelope specified.");
}
if (responseType == null)
{
throw new ArgumentException("Invalid responseType specified.");
}
MessageInterceptor interceptor = null;
try
{
lock (_syncLock)
{
if (_messageObjectStream == null)
{
return(null);
}
interceptor = new MessageInterceptor(messageId, responseType);
AddInterceptor(interceptor);
if (_messageObjectStream.Write(messageEnvelope) == false)
{
throw new ApplicationException(string.Format("Sending '{0}' to storage system failed.", messageEnvelope.GetType().Name));
}
}
if (waitTimeoutMilliseconds == 0)
{
interceptor.Wait();
return(interceptor.Message);
}
else
{
if (interceptor.Wait(waitTimeoutMilliseconds))
{
return(interceptor.Message);
}
return(null);
}
}
finally
{
if (interceptor != null)
{
RemoveInterceptor(interceptor);
interceptor.Dispose();
}
}
}
/// <summary>
/// Sends the specified message envelope and waits for the response in form of the specified message type.
/// </summary>
/// <param name="messageEnvelope">The message envelope to send.</param>
/// <param name="messageId">The message identifier to use while waiting for the response.</param>
/// <param name="responseType">The type of the response message to wait for.</param>
/// <param name="waitTimeoutMilliseconds">The wait timeout milliseconds.</param>
/// <returns>
/// Requested response message if it was received; null otherwise.
/// </returns>
public MessageBase SendAndWaitForResponse(object messageEnvelope,
string messageId,
Type responseType,
int waitTimeoutMilliseconds = 0)
{
if (messageEnvelope == null)
{
throw new ArgumentException("Invalid messageEnvelope specified.");
}
if (responseType == null)
{
throw new ArgumentException("Invalid responseType specified.");
}
MessageInterceptor interceptor = null;
try
{
lock (_syncLock)
{
if (_messageObjectStream == null)
{
return(null);
}
this.Trace("Initialize a new Message Interceptor and add it to the internal interceptor list.");
interceptor = new MessageInterceptor(messageId, responseType);
AddInterceptor(interceptor);
this.Trace($"Start sending {messageEnvelope.GetType().Name} to Storage System.");
if (_messageObjectStream.Write(messageEnvelope) == false)
{
throw new ApplicationException(string.Format("Sending '{0}' to storage system failed.", messageEnvelope.GetType().Name));
}
}
this.Trace("Waiting for the message interception notification and return the intercepted message.");
if (waitTimeoutMilliseconds == 0)
{
interceptor.Wait();
return(interceptor.Message);
}
else
{
if (interceptor.Wait(waitTimeoutMilliseconds))
{
return(interceptor.Message);
}
return(null);
}
}
finally
{
if (interceptor != null)
{
RemoveInterceptor(interceptor);
interceptor.Dispose();
}
}
}
/// <summary>
/// Reads the next Mosaic message from the underlying connection and returns it. This method will block until a new Mosaic message
/// has been read, the converter stream has been cancelled or an error occurred.
/// </summary>
/// <returns>
/// Read Mosaic message if successful; <c>null</c> otherwise.
/// </returns>
public MosaicMessage Read()
{
while (true)
{
IMessageConversion message = null;
while (message == null)
{
object readMessage = _objectStream.Read();
if (readMessage == null)
{
return(null);
}
if (readMessage.GetType() == typeof(KeepAliveRequestEnvelope))
{
var request = (KeepAliveRequestEnvelope)readMessage;
var response = new KeepAliveResponseEnvelope()
{
KeepAliveResponse = new KeepAliveResponse()
{
Id = request.KeepAliveRequest.Id,
Source = _configuration.SubscriberID,
Destination = request.KeepAliveRequest.Source
}
};
if (_objectStream.Write(response) == false)
{
this.Error("Sending keep alive response with ID '{0}' failed.", request.KeepAliveRequest.Id);
return(null);
}
continue;
}
if (readMessage.GetType() == typeof(KeepAliveResponseEnvelope))
{
var response = (KeepAliveResponseEnvelope)readMessage;
if (TypeConverter.ConvertInt(response.KeepAliveResponse.Id) == _keepAliveID)
{
System.Threading.Interlocked.Exchange(ref _lastKeepAlive, 0);
continue;
}
this.Error("Received orphan keep alive response with ID '{0}' but expected ID '{1}'.",
response.KeepAliveResponse.Id, _keepAliveID);
return(null);
}
message = readMessage as IMessageConversion;
if (message == null)
{
this.Error("Ignored unsupported message of type '{0}'.", readMessage.GetType().FullName);
continue;
}
}
var mosaicMessage = message.ToMosaicMessage(this);
if (mosaicMessage != null)
{
mosaicMessage.TenantID = _tenantID;
}
return(mosaicMessage);
}
}