.NET/ASP.NET/C#/VB.NET PDF Document SDK

The default behavior is for the Framework to automatically generate the 128-character key value used for encryption This can become a problem in a Web Farm Consider a request that server A services that uses its own generated key to encrypt ViewState data The user posts the page back to the server, and the load-balancing algorithm routes the request to server B This server uses its own auto-generated key to try and decrypt ViewState, it fails, and a run-time error is thrown To avoid this, when you re using a Web Farm, the load balancer must use sticky sessions (so each user is routed back to the same server once he or she has made an initial request), or you must manually specify the key value to use for encryption and decryption within the Machineconfig file for each server in the Farm You do this using the <machineKey> element.

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The following DemoImplicitConnectionCaching class illustrates how implicit connection caching works. First, we declare the class and the main() method after importing the required classes: /* This program demonstrates implicit connection caching. * COMPATIBLITY NOTE: runs successfully 10.1.0.2.0 */ import java.sql.Connection; import java.util.Properties; import oracle.jdbc.pool.OracleDataSource; import book.util.InputUtil; class DemoImplicitConnectionCaching { public static void main(String args[]) throws Exception { Next, in the main() method, we instantiate the OracleDataSource object, which will hold our implicit cache: OracleDataSource ods = new OracleDataSource(); ods.setURL ( "jdbc:oracle:thin:@rmenon-lap:1521:ora10g" ); ods.setUser("scott"); // username ods.setPassword("tiger"); // password We then enable the implicit caching: // enable implicit caching ods.setConnectionCachingEnabled( true );

Programming systems such as .NET support debugging as a primary activity through tools to help programmers inspect the program for possible errors. The debugger is one of the most important of these tools, and it allows you to inspect the program state during the execution. It is possible to execute the program stepwise and analyze its state during execution.

We set the cache properties with an initial and minimum limit of three connections and a maximum limit of fifteen connections The cache, when first set up, should pre-establish three connections, and it should never shrink below three connections later Note that in production code, you should use a properties file to set these properties instead of using the setProperty() method in your Java code This makes it easier to change them during runtime // set cache properties Properties cacheProperties = new Properties(); cachePropertiessetProperty( "InitialLimit", "3" ); cachePropertiessetProperty( "MinLimit", "3" ); cachePropertiessetProperty( "MaxLimit", "15" ); odssetConnectionCacheProperties(cacheProperties); We first establish two connections to the SCOTT user, followed by one connection to the BENCHMARK user We calculate and print the time it took to establish each of these connections We also interject pauses using the InputUtilwaitTillUserHitsEnter() method (explained earlier in this chapter) after each connection establishment step.

The debugger requires support from debugged programs in order to work properly; for interpreted languages, it is the interpreter that supervises the program execution, and the debugger must interact with it Compiled languages, on the other hand, must include this support during compilation so that the debugger can properly interact with the running program The CLR provides support for program debugging, and compiled programs provide information to the debugger via a file with a pdb file extension, which is the program debugging database Since the compilation process maps high-level programming constructs into equivalent ones in a less expressive language (in this case the intermediate language), some information gets lost during this process even if the semantics of the program are preserved An example is the name of local variables that in the intermediate language are referred to use indexes into an array rather than names.

This configuration element is also where the encryption type is specified Here we see a sample machine key element, with the key values truncated for brevity <machineKey validationKey="F1213F81D AD2D58F8FB0D9096F" decryptionKey="E177A93C 0A608553FA73FDD99" validation="SHA1" /> This element is then added to the <systemweb> section of the Machineconfig or the Webconfig file at the root of the web server While you can add it to the configuration file of an individual IIS application, this would only make sense in an environment where different encryption is being used for different applications in the same Web Farm..