c# upc-a

c# upc check digit

upc code generator c#

c# generate upc barcode

c# upc barcode generator

c# upc check digit,

c# upc-a,

c# upc check digit,

c# upc barcode generator,
c# upc check digit,
c# upc check digit,
upc code generator c#,
c# upc check digit,
c# upc barcode generator,
c# upc check digit,
upc code generator c#,
c# upc barcode generator,
c# upc-a,

c# calculate upc check digit,
c# calculate upc check digit,
c# upc-a,
c# generate upc barcode,
c# calculate upc check digit,
c# upc barcode generator,
c# upc-a,
c# upc check digit,
upc code generator c#,
c# upc barcode generator,
c# upc barcode generator,
c# upc barcode generator,
c# generate upc barcode,
c# generate upc barcode,
c# upc barcode generator,
c# generate upc barcode,
c# calculate upc check digit,

c# calculate upc check digit,
c# upc barcode generator,
c# upc check digit,
c# upc check digit,
upc code generator c#,
c# upc-a,
c# upc check digit,
c# upc barcode generator,
c# calculate upc check digit,
c# upc-a,
upc code generator c#,
c# calculate upc check digit,
c# calculate upc check digit,
c# calculate upc check digit,
c# generate upc barcode,
c# upc check digit,
c# upc check digit,
c# upc check digit,
c# upc check digit,
upc code generator c#,
c# upc barcode generator,
c# upc barcode generator,
c# upc-a,
c# upc check digit,
c# upc barcode generator,
c# upc check digit,
c# upc check digit,
c# upc-a,
c# calculate upc check digit,
c# upc barcode generator,
c# upc barcode generator,
c# calculate upc check digit,
c# upc check digit,
c# upc-a,
upc code generator c#,
upc code generator c#,
c# upc-a,
c# upc-a,
c# upc-a,
c# upc check digit,
c# calculate upc check digit,
c# calculate upc check digit,
upc code generator c#,
c# upc check digit,
c# upc-a,
c# calculate upc check digit,
c# generate upc barcode,
c# calculate upc check digit,
c# upc check digit,

his chapter discusses the architecture and design details of a sample application that we ll use as a case study to demonstrate the strengths of AOP within the J2EE environment. This well-known, simple sample application serves to present the material in an understandable manner. The sample is developed from the Duke s Bank application of the Sun ONE J2EE application server. This application does not depend on Sun ONE specifically, and it can be used efficiently on any J2EE application server by adapting the deployment scripts. Since this book focuses on AOP, this chapter does not go into the details of J2EE programming, but instead provides sufficient information on AOP and where it can be useful. A portion of this chapter, however, is a review of the J2EE design patterns used by the sample application. Please note that these patterns are different from the GOF patterns presented in 8. Additionally, we do not present the application s full code here; rather, we simply depict its design. If you d like more detailed information on the application, please visit the Downloads area of the Apress web site (http://www.apress.com) to access the case study code. If you aren t familiar with J2EE, we highly recommend doing some further reading on the subject before you examine the code in detail.

These annotations are used for declarative transaction management. javax.ejb.TransactionManagement Specifies transaction type, such as BMT or CMT, for an EJB.

@Target(TYPE) @Retention(RUNTIME) public @interface TransactionManagement { TransactionManagementType value() default TransactionManagementType.CONTAINER; }

Create the session bean. Call paginate(), passing in an SQL statement to retrieve data and a statement that counts data. Call next() or previous() as needed. Call cleanup() when you re through with a particular statement.

public enum TransactionManagementType { CONTAINER, BEAN }

@Target({METHOD, TYPE}) @Retention(RUNTIME) public @interface TransactionAttribute { TransactionAttributeType value() default TransactionAttributeType.REQUIRED; } public enum TransactionAttributeType { MANDATORY, REQUIRED, REQUIRES_NEW, SUPPORTS, NOT_SUPPORTED, NEVER }

Duke s Bank is a classic J2EE application composed of tiers commonly found when developing enterprise applications. It is packaged so that the modules corresponding to each tier are clearly separated. To simplify the code, we have slightly modified the Duke s Bank application, notably its packaging. For means of comparison, please refer to the original application, which is available on the Sun Microsystems web site.

import import import import java.sql.*; java.util.*; java.lang.reflect.*; javax.ejb.*;

javax.ejb.ApplicationException Denotes a checked or unchecked exception as an application exception.

@Target(TYPE) @Retention(RUNTIME) public @interface ApplicationException { boolean rollback() default false; }

public class PaginationBean implements SessionBean { private int page = 10; Stores the size of private ResultSet set = null; a page of data private int total = 0; private Connection con = null; private Statement stmt = null; private int firstRowNumber = 1; /****************************** *other bean methods not shown * ******************************/ public void paginate( String sql, String countSQL ) { try { ResultSet temp = executeQuery( countSQL ); Executes the count SQL and total = temp.getInt( 1 ); stores the total number of rows cleanup(); set = executeQuery( sql ); Executes the query SQL }catch( Exception e ){ and stores the result set set = null; e.printStackTrace();

@Target({TYPE}) @Retention(RUNTIME) public @interface DeclareRoles { String[] value(); }

Before we cover the details of the tiers, we ll provide an overview of the whole application and its organization in the sections that follow.

@Target({TYPE, METHOD}) @Retention(RUNTIME) public @interface RolesAllowed { String[] value(); }

@Target ({TYPE, METHOD}) @Retention(RUNTIME) public @interface PermitAll {}

} } public Object[] next() { if( total == 0 ) return null; Object[] rvalue = null; int count = page; //try to return a full page

@Target (METHOD) @Retention(RUNTIME) public @interface DenyAll {}

As J2EE advises, the application is composed of several tiers, as shown in Figure 10-1.

javax.annotation.security.RunAs Specifies that a business method should run under a given role when it is invoked.

try { //see if we can return a total page, // if not get as much as allowed if( (count + set.getRow() ) > total ) { count = total - set.getRow() + 1; } //if count is zero, we are at the end of the set if( count == 0 ) return null; //update the current page index current++; rvalue = new Object[ count ]; for( int i = 0; i < count; i++ ) { rvalue[ i ] = buildObject( set.next() ); } //reset the first row number variable // for previous() comparisons if (set.isAfterLast()) firstRowNumber = total - count + 1; else firstRowNumber = set.getRow() - count; } catch( Exception e ) { e.printStackTrace(); } return rvalue; } public Object[] previous() { if( total == 0 ) return null;

@Target(TYPE) @Retention(RUNTIME) public @interface RunAs { String value(); }

These annotations are used for EJB lifecycle callbacks. javax.annotation.PostConstruct Marks a method in the bean class or an interceptor class as a postconstruct lifecycle callback method.