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Another way of managing content is the use of a Java package. Packages help you manage content within a project in the same way as a folder helps group files in the drawer of your filing cabinet. This is particularly useful when creating artifacts like ADF Business Components, which can be compartmentalized into different functional packages. Furthermore, packages are important to avoid conflicts when it comes to integration or deployment to a production system where potentially files with the same name already exist.
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Creating a Package You can explicitly create a package by selecting File | New and, in the
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New Gallery dialog, selecting General and then Java Package. Alternatively, when creating a Java class, or artifacts like ADF Business Components, you can enter a new package name, and that package will be created for you. Package names usually follow a naming hierarchy separated by a period. So, a package name might follow a convention like companyname.application .name.
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You should now feel comfortable exploring the JDeveloper windows and the structure of a Fusion application. Specifically, you learned: How to manage the windows within JDeveloper. Which are the most commonly utilized windows and what they are used for. How your source files can be managed via applications, projects, and packages.
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As you become more comfortable finding your way around JDeveloper, the next step is to build your first Fusion application, starting with the business services layer, as described in the next chapter.
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Building Business Services
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Building ADF Business Components
Quick Start Guide to Oracle Fusion Development
his chapter will take you through the concepts, building blocks, and steps to create a first-cut business service based on ADF Business Components. As a Fusion developer, you have the challenge of building a business service based on a number of tables in an Oracle database.
NOTe The examples used in this book are based on the OE (Order Entry) Sample schema available with the Oracle database.
The Goals for ADF Business Components
As outlined in 2, there are a number of goals for a business services framework like ADF Business Components. At the most fundamental level, a business service is required to query information from an underlying database and cache that data while various operations are performed on it. It then has to validate the data changes and complete the transaction by committing the data back to the database. This use case can be broken down into the following high-level tasks: Defining application objects that map to database tables Managing data and business logic validation Creating application-specific views of the data Coordinating master/detail behavior of the business model based on foreign key relationships Providing default operations such as commit, delete, and update on the data model
ADF Business Components provides these core features within the framework in a generic way, allowing these generic services to be adapted for the application-specific case. However, before embarking on creating a business service based on ADF Business Components, let s first look behind the scenes at the various ADF Business Components building blocks.
How ADF Business Components Works
The core features and functionality of the ADF Business Components framework are implemented in Java. For the most part, the Java classes responsible for the previously noted features, and more, are hidden from the Fusion developer. Instead, the developer generates and maintains metadata through property pages and declarative editors, and it is this metadata that drives the generic Java framework classes when the application runs.
Building a Default Business Service
JDeveloper offers a number of different ways to build ADF Business Components, including visually through modelers or by stepping through wizards. Regardless of the actual method you choose, JDeveloper does the same job for you behind the scenes. When building ADF Business Components, JDeveloper queries the database and reads information about the tables on which the business service is to be based. For example, it discovers what columns are in the table, what data types, their precision, whether the field can be null, and whether it is a foreign key. This information is then encoded into XML files as part of the application project.