1Z0-807 무료 덤프문제 온라인 액세스

While analyzing an existing web application, you observe the following issues in the source code:
-Duplicatecontrol code is scattered throughout various view. -Businessand presentationlogicare mixed within these view.
The next phase of the project involves refactoring the existing code to address these two issues.
Which design pattern, if employed in the refactoring exercise, would most directly address the two issues?

• A.Composite View
• B.Service to Worker
• C.Dispatcher view
• D.DAO

ABC Travel offers a night reservation service, exposed as a web service. XYZ Stays offers a hotel reservation service, also exposed as a web service. ABC and XYZ will not change their web service. A startup company has contacted you for advice about designing a new service that combines flight and hotel reservations, which they will offer as a web service.
The startup company plans to provide their service by implementing a portable Java EE solution that aggregates the two services offered by ABC Travel and XYZ Stays, a combined reservation succeeded Only if both the flight reservation and the hotel reservation succeed.
Which is the most effective way to meet the business requirement?

• A.The startup company should implement their new service as aweb service by calling the two existing services, and implementing their owncompensating transaction.
• B.The startup company cannot implement their new service as a web service, but must use an enterprise JavaBean (EJB) component to gain transaction propagation.
• C.The startup company should implement their new service as a web service that uses an XA transaction manager.
• D.The startup company can implement their new service as a web service by calling the two existing services in a single transaction, relying on transaction propagation to support this business rule.

What are two consequences of using the Composite View pattern?

• A.Avoids duplicate content
• B.Improves performance
• C.Restricts all sub views to have a consistent view technology
• D.Allows tables to be reused in multiple locations
• E.Forces a whole-part dependency

Which two statements are true about delegation as an Object-Oriented Design technique?

• A.It allows you to replace Inheritance with composition.
• B.It is applied to a system only at compile time.
• C.It always requires that at least two objects are involved in handling a request.
• D.It is an essential element of the Singleton pattern.
• E.In Java technology, it is always implemented through the use of generics.

Which two statements are true about the timer service of a business component container?

• A.When a transaction is rolled back, the timer creation within the transaction is also rolled back.
• B.When stateful session bean instance is removed, the container detaches the timers associated with the instance and allocates them to the new instance.
• C.Each instance of messagedriven beans has unique timers.
• D.When the server is shut down,the timer is persisted automatically and becomes active again when the server is restarted.
• E.Timed notifications for all types of session beans can be scheduled by using this service.