birt code 39

birt code 39

birt code 39

birt code 39

birt code 39

birt code 39,
birt code 39,

birt code 39,
birt code 39,
birt code 39,

birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,

birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,

birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,

aspectjOrder) is true for all the calls made to the addItem method by the Order class This expression excludes any calls to addItem made by other classes Control-Flow Filtering The filtering operators presented previously are static They do not depend on the dynamics of the program or the way the program is run but only on its structure Therefore, all the previous joinpoints can be statically computed without the program needing to be run AspectJ defines two additional filtering operators, cflow and cflowbelow These are referred to as control-flow operators Intuitively, the control flow of a program encompasses all the methods that are visited during the program s execution To illustrate the way that cflow and cflowbelow work, take the example of a simple program that calls the Foofoo and Barbar methods from the main method The Foofoo method also calls Barbar.

Note, though, that there is no guarantee exactly what the Principal name might return. In some environments, it can return the role name, group name, or any other arbitrary String that makes sense for the authentication system. Before you use the Principal.getName method, you should check the documentation of your particular security environment. As you can see, the one great drawback of programmatic security management is the intermixing of security code with business logic as well as the potential hard-coding of role and Principal names. In previous versions of EJB, there was no way of getting around these shortfalls. However, in EJB 3 you can alleviate this problem somewhat by using interceptors. Let s see how to accomplish this next. Using interceptors for programmatic security As you know, in EJB 3 you can set up interceptors that are invoked before and after (around) any EJB business method. This facility is ideal for crosscutting concerns that should not be duplicated in every method, such as programmatic security (discussed in chapter 5) . We could reimplement listing 6.6 using interceptors instead of hard-coding security in the business method (see listing 6.7).

As you develop more and more entity beans, you find yourself also having to create the primary key class. As we emphasized in this chapter, having to code one more class just adds to the time it takes to develop a bean and increases your chances for having source files out of synch.

public class SecurityInterceptor { Marks intercepted invocation @AroundInvoke public Object checkUserRole(InvocationContext context)

Summary

This last method does not perform any calls The following pointcut descriptors intercept the calls to the bar method only if bar is called from foo, so calls to bar from main are ignored: pointcut foopcd(): call( * Foofoo(.) ); pointcut callToBarInFoo(): call( * Barbar(.) ) && cflow( foopcd() ); The callToBarInFoo pointcut descriptor specifies that calls to bar only in the control flow of the foopcd pointcut descriptor are considered The foopcd pointcut descriptor designates all the calls to the foo method Intuitively, you can consider that the control flow of the program enters the foopcd pointcut when foo is called and exits the pointcut when the call returns The expression cflow(foopcd()) designates all the joinpoints located between this entry point and exit point More formally, the cflow operator is associated with a pointcut named p.

To have XDoclet generate a primary key class, use the @ejb.pk tag in your bean source file, use the @ejb.pk-field tag to denote an accessor for the primary key, and modify your <ejbdoclet/> task to include the <entitypk/> subtask. For instance, examine the ItemBean class shown in listing 2.10. The XDoclet tags applicable to this recipe are shown in bold; the others can be found in earlier recipes.

throws Exception { if (!context.getEJBContext().isCallerInRole("CSR")) { throw new SecurityException( Accesses "No permissions to cancel bid"); EJBContext from } InvocationContext return context.proceed(); } }

Specifies interceptor @Stateless for method public class BidManagerBean implements BidManager { @Interceptors(actionbazaar.security.SecurityInterceptor.class) public void cancelBid(Bid bid, Item item) { ... }

package ch2; import javax.ejb.*; /** * @ejb.bean type="CMP" * name="ItemBean" * jndi-name="ejb/ItemBean" Identifies the * view-type="both" primary key field * primkey-field="ID"; * @ejb.pk Adds the primary key tag */ public abstract class ItemBean implements EntityBean { public void setEntityContext( EntityContext context) {} public void unsetEntityContext( ) {} public public public public public void void void void void ejbRemove() {} ejbLoad() {} ejbStore() {} ejbActivate() {} ejbPassivate() {}