In which case does a oneway call block a client?
If the number of queued messages has exceeded the queue’s capacity, then the client will block, even when issuing a one-way call. However, once the call is queued, the client is unblocked and can continue executing while the service processes the operation in the background.
What is duplex communication in WCF?
A duplex contract allows clients and servers to communicate with each other independently so that either can initiate calls to the other. The duplex contract is one of three message patterns available to Windows Communication Foundation (WCF) services. The other two message patterns are one-way and request-reply.
What is callback contract?
Callback contracts that have one-way operations represent calls from the service that the client can handle. The ServiceContractAttribute attribute is ignored on callback contracts. To configure runtime behavior of callback objects, use the System. ServiceModel. CallbackBehaviorAttribute.
Which HTTP binding is used for duplex contracts?
This is the WsDualHttpBinding. This binding is designed for use with Duplex Service contracts, which allows both the Services and clients to send and receive the messages.
What is difference between WCF and Web API?
KEY DIFFERENCE WCF is used for developing SOAP-based services whereas Web API is used for both SOAP-based and RESTful services. WCF does not offer any support for MVC features whereas Web API supports MVC features. WCF supports HTTP, UDP, and custom transport protocol whereas Web API supports only HTTP protocol.
Which of the security modes are supported in WCF?
Windows Communication Foundation (WCF) security has three common security modes that are found on most predefined bindings: transport, message, and “transport with message credential.” Two additional modes are specific to two bindings: the “transport-credential only” mode found on the BasicHttpBinding, and the “Both” …
What is service callback?
Callback is a service developed for companies, institutions and organizations that have a large number of incoming calls in a shorter timespan. With the Callback function you can create phone queues so that the customers don’t have to wait for their turn with the phone in their hands.
What is message contract in WCF?
A message contract is used to control the structure of a message body and serialization process. It is used to send/access the information in the soap header. By use of a Message Contract we can customize the parameters sent using a SOAP message between the client and the server.
What is a duplex service?
A duplex service contract is a message exchange pattern in which both endpoints can send messages to the other independently. A duplex service, therefore, can send messages back to the client endpoint, providing event-like behavior.
Can we call web API from WCF service?
WCF offers webHttpBinding which is used to access any REST API. The WebChannelFactory class uses a ServiceContract interface as template. It accepts the binding and the URL information to create a factory object. Using the WCF client, we call an interface method to invoke the API.