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itext pdf java new page

Figure 7-3. Click the SETTINGS tab to view configuration settings. Figure 7-4 shows the next two configuration settings. Maximum alias length is the maximum length of a generated URL, which is capped at 255. The Maximum component length setting is the maximum length of any replacement pattern, such as the [node:nid]. I usually leave these at their default settings.

Most enterprise applications contain a large number of components Enterprise applications are designed to solve a unique type of customer problem, but they share many common characteristics For example, most enterprise applications have some kind of user interface and they implement business processes, model a problem domain, and save data into a database Because of these commonalities, you can a follow a common architecture or design principle for building enterprise applications known as patterns For server-side development, the dominant pattern is layered architectures In a layered architecture, components are grouped into tiers Each tier in the application has a well-defined purpose, sort of like a profession but more like a section of a factory assembly line Each section of the assembly line performs its designated task and passes the remaining work down the line In layered architectures, each layer delegates work to a layer underneath it.

EJB allows you to build applications using two different layered architectures: the traditional four-tier architecture and domain-driven design (DDD) Let s take a brief look at each of these architectures Traditional four-tier layered architecture Figure 14 shows the traditional four-tier server architecture This architecture is pretty intuitive and enjoys a wide popularity In this architecture, the presentation layer is responsible for rendering the graphical user interface (GUI) and handling user input The presentation layer passes down each request for application functionality to the business logic layer The business logic layer is the heart of the application and contains workflow and processing logic In other words, business logic layer components model distinct actions or processes the application can perform, such as billing, searching, ordering, and user account maintenance The business logic layer retrieves data from and saves data into the database by utilizing the persistence tier.

in Figure 7-17.

The persistence layer provides a high-level object-oriented (OO) abstraction over the database layer The database layer typically consists of a relational database management system (RDBMS) like Oracle, DB2, or SQL Server..

Figure 7-4. Click the SETTINGS tab to view configuration settings. Figure 7-5 shows the final group of general settings. Update action determines what happens when a node is saved and a replacement pattern is changed, such as the [node:title]. By default, Pathauto is set to create a new alias and delete the old. As explained in the previous section, I do not recommend changing URL paths after a site has gone into production. You could change this to create a new alias and leave the existing alias functioning, basically creating two URLs to access the same node. The issue with this is that a search engine may penalize your search rankings if it finds duplicate content on your site.

Session beans are a lot more than just business logic holders. Remember the EJB services we briefly mentioned in chapter 1 The majority of those services are specifically geared toward session beans. They make developing a robust, featurerich, impressive business logic tier remarkably easy (and maybe even a little fun). Let s take a look at some of the most important of these services. Concurrency and thread safety The whole point of building server-side applications is that they can be shared by a large number of remote clients at the same time. Because session beans are specifically meant to handle client requests, they must support a high degree of concurrency safely and robustly. In our ActionBazaar example, it is likely thousands of concurrent users will be using the PlaceBid session bean we introduced in chapter 2. The container employs a number of techniques to automagically

5. Close the Storyboard by clicking the Close Storyboard button, as I am doing in Figure 7-18.