Figure 56 Output controlling the number of concurrent instances in .NET framework

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Figure 56 Output controlling the number of concurrent instances
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Controlling the Number of Concurrent Calls When is speci ed as , WCF creates a single instance within the host, regardless of how many client requests are made When is speci ed as , WCF creates a thread per request (up to system limits) for parallel execution of the service methods behavior controls how many conTo throttle this, the current calls can be active
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service with and vice operation takes 20 seconds to complete
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Listing 59 Service Using Behavior and
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Listing
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behaviors for The ser-
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Listing 510 shows the le for the service The behavior is set to ve, indicating that no more than ve calls can be currently active at the same time
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Listing 510 Throttling Concurrency with
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Concurrency and Instancing (Ser vice Behavior)
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Figure 57 shows the output from the client in Listing 57 (left) and service (right) In the client, note that ten calls are made immediately when the program starts Of those ten requests, ve results come back after 20 seconds and the remaining ve results come back after another 20 seconds In the service output, note that only one instance is ever created Also note that start immediately after, each on its own thread When ve calls to those ve calls complete, the threads are reused and subsequent calls from the client are handled
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Controlling the Number of Concurrent Sessions When is speci ed as , WCF creates an instance for each session that connects to the service To control the number of sesbehavior can be sions connected to a service, the used When the maximum is reached, the next client that attempts to create a session will wait until another session is closed This setting is useful for limiting the number of users (or clients or servers) that can connect to a service
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Figure 57 Output controlling the number of concurrent calls
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Listing 511 shows a service with and behaviors The service operation takes 20 seconds to complete
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Listing 511 Service Using Behavior and
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Listing 512 shows the le for the service The behavior is set to 5, indicating that no more than ve sessions can be created from clients to the service at the same time is used rather than because Notice that the latter doesn t support sessions
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Listing 512 Throttling Concurrency with
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Figure 58 shows the output from the client in Listing 57 (left) and service (right) In the client, ten calls are made immediately when the program starts Of those ten requests, ve results come back after 20 seconds and the remaining ve results come back after another 20 seconds In the service are output, note that ve sessions are created and ve calls to started immediately after the client calls the service After those ve calls
5: Behaviors
complete and the client closes the connection, subsequent sessions can be created
Figure 58 Output controlling the number of concurrent sessions
Exporting and Publishing Metadata (Service Behavior)
The ABCs of a service its addresses, bindings, and contracts are represented in metadata so that potential clients know where, how, and what to communicate This information is collectively referred to as service metadata The metadata service behavior is the rst behavior that most developers encounter, because it s referenced in the con guration les generated by Visual Studio 2008 when you create WCF project This behavior works in concert with a metadata endpoint to make metadata available to clients Two steps are necessary to make metadata useful for clients: export it in a format that they can read and publish it somewhere that they can nd it The default export format is WSDL, so as long as clients can read standardsbased metadata format, they can understand how to communicate with the service WCF publishes the metadata using the WS-MetadataExchange protocol over any supported transport, or it can publish the metadata in response to an HTTP GET Both of these steps, the export and publishing the in a service metadata, are implemented by the Metadata is exposed from a service through a Metadata Exchange (MEX) endpoint A MEX endpoint is like any other WCF endpoint: It has an
Exporting and Publishing Metadata (Ser vice Behavior)
address, a binding, and a contract Like any other endpoint, a MEX endpoint can be added to a service either through con guration or through code interface as its A MEX endpoint should expose the , this interface procontract De ned in vides methods that inspect a service and expose its metadata as WSDL A number of system-supplied bindings are available for MEX endpoints, such , , or as The address of a MEX endpoint can be either relative or absolute, following the normal addressing rules for endpoints Listing 513 shows a con guration le that de nes and exposes metabehavior The behavior is quali ed with data using the , directing WCF to respond to HTTP GET requests on the endpoint in addition to WS-MEX requests The service contract includes an endpoint that exposes an interface The endpoint uses relative addressing, using the HTTP transport, so the absolute address of the endpoint is http://local, which host:8000/EssentialWCF/mex The endpoint uses without security creates a