What is concurrency mode in WCF?

Concurrency is the control of multiple threads active in an InstanceContext at any given time. WCF concurrency will help us to configure how WCF service instances can serve multiple requests at the same time. There are three basic types of concurrency supported by WCF 4.0: Single Concurrency Mode.

How many modes are of concurrency in WCF?

three concurrency modes
There are three concurrency modes available: Single : Each service instance processes one message at a time. This is the default concurrency mode. Multiple : Each service instance processes multiple messages concurrently.

What is session in WCF?

In Windows Communication Foundation (WCF) applications, a session correlates a group of messages into a conversation. WCF sessions are different than the session object available in ASP.NET applications, support different behaviors, and are controlled in different ways.

What are the different instance modes in WCF?

The WCF framework has defined the following three Instance Context modes: PerCall, PerSession, and Single.

Is WCF client thread safe?

Yes, it is thread-safe. However, you should know that WCF will automatically serialize the execution of CalculateSomething when it is called from more than one thread using the same ClientBase instance.

How many requests can a WCF service handle?

one request
WCF service can handle one request at a time.

Can you explain transactions in WCF?

WCF – Transactions. A transaction in WCF is a set of operations that follow some properties, collectively known as ACID. Here, if a single operation fails, the entire system fails automatically. When an order is placed online, a transaction takes place.

Is WCF stateless or stateful?

2 Answers. Per-call services are the Windows Communication Foundation default instantiation mode. So, by default, WCF services do not maintain state.

What is throttling in WCF?

Throttling in WCF is used to limit the service throughput so that the resource consumption (memory, processor, disk, network, etc.) in the system is at an acceptable level, i.e., ensure the service doesn’t consume resources beyond acceptable limits.

What is default instance mode in WCF?

Per-call service is the default instance activation mode of WCF. When a WCF service is configured for a per-call service, a CLR object is created for the timespan a client call or request is in progress.

Which instance mode of WCF is shared among all user?

WCF supports three types of instance activation: per-call services allocate (and destroy) a new service instance for each client request; sessionful services allocate a service instance for each client connection; and singleton services share the same service instance for all clients, across all connections and …

What are the bindings in WCF?

Bindings are objects that are used to specify the communication details that are required to connect to the endpoint of a Windows Communication Foundation (WCF) service. Each endpoint in a WCF service requires a binding to be well-specified.

How is instancing and Concurrency related in WCF?

Instancing is about how the objects are created on the server, such as single or multiple objects are created on the server side. Concurrency is about how the requests are handled by the WCF object, such as single or multiple threads are created on the server side to process the client requests.

How many WCF instances are created per session?

In this combination, one WCF service instance is created for every WCF client session because the WCF instance mode is set to per session. All the method calls are executed in a sequential manner one by one. In other words]

How are new instances created in concurrency mode?

With the instance mode percall, new instances will be created for every service method call. When the concurrency mode is Multiple, Multiple threads will be created on the server to manage all the requests from each client. In the above diagram you can find that a server instance will be created on every method call that the client does.

How are requests processed at the same time in WCF?

In other words, requests are processed at the same time by spawning multiple threads on the WCF server object. So you have great throughput here but you need to ensure concurrency issues related to WCF server objects.