What is WCF?
WCF is a service Oriented programming in .net framework 3.0 which provide unique platform for all type of Communications in .net for distributed Applications.
It is the latest service oriented technology; Interoperability is the fundamental characteristics of WCF.
Address: Basically URL, specifies where this WCF service is hosted .Client will use this url to connect to the service.
e.g http://localhost:3446/Service1.svc.
Binding: Binding will describes how client will communicate with service. There are different protocols available for the WCF to communicate to the Client. You can mention the protocol type based on your requirements.
Contract: Collection of operation that specifies what the endpoint will communicate with outside world. Usually name of the Interface will be mentioned in the Contract, so the client application will be aware of the operations which are exposed to the client. Each operation is a simple exchange pattern such as one-way, duplex and request/reply
Operation Contract: Attribute Which is used to define the Method as part of Service.
Message Contract: Default SOAP message format is provided by the WCF runtime for communication between Client and service. If it is not meeting your requirements then we can create our own message format. This can be achieved by using Message Contract attribute.
Policies and Binding: Specify conditions required to communicate with a service e.g security requirement to communicate with service, protocol and encoding used for binding.
Service Runtime: It contains the behaviors that occur during runtime of service.
Throttling Behavior- Controls how many messages are processed.
Error Behavior - Specifies what occurs, when internal error occurs on the service.
Metadata Behavior - Tells how and whether metadata is available to outside world.
Instance Behavior - Specifies how many instance of the service has to be created while running.
Transaction Behavior - Enables the rollback of transacted operations if a failure occurs.
Dispatch Behavior - Controls how a message is processed by the WCF Infrastructure.
Messaging
Messaging layer is composed of channels. A channel is a component that processes a message in some way, for example, by authenticating a message. A set of channels is also known as a channel stack. Channels are the core abstraction for sending message to and receiving message from an Endpoint. Broadly we can categories channels as
Transport Channels: Handles sending and receiving message from network. Protocols like HTTP, TCP, name pipes and MSMQ.
Protocol Channels: Implements SOAP based protocol by processing and possibly modifying message. E.g. WS-Security and WS-Reliability.
Activation and Hosting
Services can be hosted or executed, so that it will be available to everyone accessing from the client. WCF service can be hosted by following mechanism
IIS: Internet information Service provides number of advantages if a Service uses Http as protocol. It does not require Host code to activate the service, it automatically activates service code.
Windows Activation Service: (WAS) is the new process activation mechanism that ships with IIS 7.0. In addition to HTTP based communication, WCF can also use WAS to provide message-based activation over other protocols, such as TCP and named pipes.
Self-Hosting: WCF service can be self hosted as console application, Win Forms or WPF application with graphical UI.
Windows Service: WCF can also be hosted as a Windows Service, so that it is under control of the Service Control Manager (SCM).
WCF is a service Oriented programming in .net framework 3.0 which provide unique platform for all type of Communications in .net for distributed Applications.
It is the latest service oriented technology; Interoperability is the fundamental characteristics of WCF.
Basic Bare Bones of WCF.Endpoints (ABC terms).
- Address
- Binding
- Contract
All the WCF communications are take place through end point. End point consists of three components.(i.e ABC)
Address: Basically URL, specifies where this WCF service is hosted .Client will use this url to connect to the service.
e.g http://localhost:3446/Service1.svc.
Binding: Binding will describes how client will communicate with service. There are different protocols available for the WCF to communicate to the Client. You can mention the protocol type based on your requirements.
Contract: Collection of operation that specifies what the endpoint will communicate with outside world. Usually name of the Interface will be mentioned in the Contract, so the client application will be aware of the operations which are exposed to the client. Each operation is a simple exchange pattern such as one-way, duplex and request/reply
Service Contract: Service contracts describe the operation that service can provide.
Operation Contract: Attribute Which is used to define the Method as part of Service.
Message Contract: Default SOAP message format is provided by the WCF runtime for communication between Client and service. If it is not meeting your requirements then we can create our own message format. This can be achieved by using Message Contract attribute.
Policies and Binding: Specify conditions required to communicate with a service e.g security requirement to communicate with service, protocol and encoding used for binding.
Service Runtime: It contains the behaviors that occur during runtime of service.
Throttling Behavior- Controls how many messages are processed.
Error Behavior - Specifies what occurs, when internal error occurs on the service.
Metadata Behavior - Tells how and whether metadata is available to outside world.
Instance Behavior - Specifies how many instance of the service has to be created while running.
Transaction Behavior - Enables the rollback of transacted operations if a failure occurs.
Dispatch Behavior - Controls how a message is processed by the WCF Infrastructure.
Messaging
Messaging layer is composed of channels. A channel is a component that processes a message in some way, for example, by authenticating a message. A set of channels is also known as a channel stack. Channels are the core abstraction for sending message to and receiving message from an Endpoint. Broadly we can categories channels as
Transport Channels: Handles sending and receiving message from network. Protocols like HTTP, TCP, name pipes and MSMQ.
Protocol Channels: Implements SOAP based protocol by processing and possibly modifying message. E.g. WS-Security and WS-Reliability.
Activation and Hosting
Services can be hosted or executed, so that it will be available to everyone accessing from the client. WCF service can be hosted by following mechanism
IIS: Internet information Service provides number of advantages if a Service uses Http as protocol. It does not require Host code to activate the service, it automatically activates service code.
Windows Activation Service: (WAS) is the new process activation mechanism that ships with IIS 7.0. In addition to HTTP based communication, WCF can also use WAS to provide message-based activation over other protocols, such as TCP and named pipes.
Self-Hosting: WCF service can be self hosted as console application, Win Forms or WPF application with graphical UI.
Windows Service: WCF can also be hosted as a Windows Service, so that it is under control of the Service Control Manager (SCM).
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