ASP.NET Web PDF Document Viewer/Editor Control Library

This is a very simple interface, which exposes an integer for you to use to report the count of session variables at the moment session state is restored. This code allows you to move custom information from a preprocessor into an instance of a request handler. To pass this information to any handler, the implementation needs only to inherit from this interface: public class CreateSessionVars : System.Web.UI.Page, ISessionCounter { private int _SessionVarCount; public int SessionVarCount { get { return _SessionVarCount; } set { _SessionVarCount = value; } } //Snip This page uses implementation inheritance with System.Web.UI.Page as its base class, as is the usual case for ASPX code-behinds, but then takes the additional step of implementing the ISessionCounter interface. The page will now be instructed by the request preprocessor as to how many session variables existed when the session state was first restored. It can do whatever it needs to with this information. In this case, you ll use it to expose a button to create a user-selected number of session variables, and then track the deltas as postbacks occur. Leveraging this interface-based approach to polymorphic handler types is a common method to check type information on the handler in a preprocessor, and pass information from the preprocessor pipeline into a handler. You can use custom attributes this way as well, for an aspect-based approach yielding similar polymorphic behavior. Figure 2-2 shows the page as it appears when it s first rendered.

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public static void main(String args[]) throws Exception { _checkProgramUsage( args ); Connection conn = null; try { conn = JDBCUtil.getConnection("benchmark", "benchmark", args[0]); We first invoke the method _fetchArray(), which retrieves the array from the database using techniques covered earlier: ARRAY array = _fetchArray( conn ); We then set the auto-buffering and auto-indexing flag based on the values passed at the command line: array.setAutoBuffering( autoBufferingFlag ); array.setAutoIndexing( autoIndexingFlag ); To identify which option we are running, we create a description of the option we chose (the setting of auto-buffering and auto-indexing). We will pass this to the individual methods we invoke later. String optionsDesc = " AutoBuffering: " + autoBufferingFlag + " AutoIndexing: " + autoIndexingFlag; Recall that auto-indexing makes sense only if the array members are being accessed randomly. To do that, we create 10,000 random indexes that range from 0 to 9999. We use the method random() in the java.lang.Math class to generate a number greater than or equal to 0.00 but less than 1.00. We multiply it by 9999 and then truncate it to an int to get random numbers within our desired range. We store these numbers in an int array. int[] indexes = new int[ 10000 ]; for( int i=0; i < 10000; i++ ) { int randomNumber = (int)(Math.random()* 9999); indexes[i] = randomNumber; } We then invoke the method _runBenchmark(), passing the relevant information as parameters: new BenchmarkCollectionRetrievalMethods()._runBenchmark( conn, new Object[] { array, indexes }, optionsDesc ); } finally { // release JDBC resources in the finally clause. JDBCUtil.close( conn ); } }

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The method fetchArray() simply retrieves our varray collection as an ARRAY object using techniques we have already covered: private static ARRAY _fetchArray( Connection conn ) throws SQLException { PreparedStatement pstmt = null; ResultSet rset = null; ARRAY array = null; try { // Step 1 - prepare and execute the statement String stmtString = "select varray_column from number_varray_table" + " where rownum <= 1"; pstmt = conn.prepareStatement( stmtString ); rset = pstmt.executeQuery(); if( rset.next() ) { array = (ARRAY) rset.getArray(1); } } finally { JDBCUtil.close( rset); JDBCUtil.close( pstmt); } return array; } The method _runBenchmark() simply invokes the method timeMethod() inherited from the JBenchmark class, passing in the relevant information to the method: private void _runBenchmark( Connection conn, Object[] parameters, String optionsDesc) throws Exception { timeMethod( JBenchmark.FIRST_METHOD, conn, parameters, GET_ARRAY_DESC + optionsDesc ); timeMethod( JBenchmark.SECOND_METHOD, conn, parameters, GET_ORACLE_ARRAY_DESC + optionsDesc ); timeMethod( JBenchmark.THIRD_METHOD, conn, parameters, GET_RESULT_SET_DESC + optionsDesc ); } We override the first method to use the method getArray() of the ARRAY class. Notice how we retrieve each object based on the random indexes we generated in the int array: public void firstMethod( Connection conn, Object[] parameters ) throws Exception

COM+ has its own infrastructure for enforcing role-based security. You can apply roles at the component, interface, or method level. From Serviced Components, the .NET developer has two main tasks: creating COM+ roles and enforcing security at the appropriate level to make sure a caller is in the required role for the service it s attempting to call. Role creation is done with an assembly-level attribute: [assembly: [assembly: [assembly: [assembly: SecurityRole("Executive")] SecurityRole("Director")] SecurityRole("Manager")] SecurityRole("Grunt")]

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