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Listing 9-9 Client Application Using Cookies for the Session
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static void Main(string[] args) { Attendee attendee = new Attendee(); attendeeFirstName = "Arnold"; attendeeLastName = "Schwarzenegger"; CourseClientlocalhostService1 ws = new CourseClientlocalhostService1(); wsCookieContainer = new SystemNetCookieContainer(); Course[] courses = wsGetCourseMapForAttendee(attendee); // get the cookies to use them again for the next // web service method SystemNetCookieContainer cookies = wsCookieContainer; // }
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The session gets automatically deactivated after a timeout By default, the session is deactivated when the client is inactive for 20 minutes, although you can change the session timeout value in the Web configuration file webconfig The session is configured with the <sessionState> element, as shown in Listing 9-10 The timeout attribute defines the session timeout in minutes Other than configuring the timeout, you can also configure a session state server, if you are using a Web farm, so that the session state is passed to a session state server or stored inside the database
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Listing 9-10 Session Configuration
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<sessionState mode="InProc" stateConnectionString="tcpip=127001:42424" sqlConnectionString= "data source=127001;Trusted_Connection=yes" cookieless="false" timeout="20" />
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Session State in a Web Service Farm
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If you are using session state in a Web service farm, the session data must be available to all Web servers This can be done either by storing the session data in a session state server or by storing the session data in the database Part of the ASPNET runtime is the Windows service ASPNET state service This service must be started on one host, and the configuration files of all Web services must reference this service You can do this by setting the mode attribute (see Listing 9-6) to StateServer and by setting thestateConnectionString to the host of the service If you use a database for the session state (this has the advantage that with a database cluster there is no single point of failure), the mode attribute must be set to SQLServer, and the sqlConnectionString must reference the database You can create the database by starting the scripts InstallPersistSqlStatesql that you can find in the NET Framework runtime directory <windir>/MicrosoftNET/Framework/<version>
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When the session timeout occurs, the Session_End event is raised in the globalasax file In this event procedure, you can write the session state to a permanent store to read it again when the session is started in the Session_Start method The methods are shown in Listing 9-11
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Listing 9-11 Session Start and End Events
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protected void Session_Start(Object sender, EventArgs e) { } protected void Session_End(Object sender, EventArgs e) { }
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Cache
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You can use the ASPNET cache to store session-independent data in memory The cache is represented by the class SystemWebCachingCache class, and is flexible in the way the cache can be invalidated The dependencies that can be configured with the cache are shown in Table 9-3
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Table 9-3 Cache Dependencies
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Cache Dependencies Absolute expiration Sliding expiration Description
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With the absolute expiration, you can set a DateTime when the cache should be invalidated Instead of setting an absolute time span, you can define a sliding time when the cache should be invalidated, with a TimeSpan value If the sliding expiration is set, the absolute expiration must be set to DateTimeMaxValue Conversely, if the absolute expiration is set, the sliding expiration must be set to TimeSpanZero
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Priority
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The cache can also be invalidated if the memory is low If the memory is low, the ASPNET runtime removes items from the cache depending on their priority setting Cache objects with lower priorities are removed before cache objects with higher priorities The priority is set with a value of the enumeration CacheItemPriority With the cache, you can make a direct dependency on files The cache automatically gets invalidated when a file changes that is defined with the dependencies If the state of the cache is read from a file, you can automatically update the cache when the file changes You can also specify variables that are responsible for the invalidation of the cache As soon as a value of the defined variables changes, the cache is invalidated
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