![]() The following steps show you how to use Apache Ant to compile, build, and run the DictionaryServiceDemo sample: The DictionaryServiceDemo sample includes Apache Ant build files, which are all named build.xml. ![]() It is These steps assume that you unzipped the contents of this file into the directory C:\DictionaryServiceDemo.Ĭhange the current directory to C:\DictionaryServiceDemo\DictionaryDemo and follow the step Run the Client.Ĭompiling and Running the DictionaryServiceDemo Sample Running the DictionaryServiceDemo Sampleīecause the zip file DictionaryServiceDemo.zip contains compiled class files, you can unzip this file to your computer and run the sample without compiling it by following these steps:ĭownload and unzip the sample code: Download and unzip the file DictionaryServiceDemo.zip to your computer. Note: The build directories contain the compiled class files of the Java source files contained in the src directory in the same level. This sample, which is packaged in the zip file DictionaryServiceDemo.zip, consists of the following files: The DictionaryServiceDemo sample shows you how to implement a Dictionary service, create Dictionary service providers that add additional dictionaries, and create a simple Dictionary service client that tests the service. Ideally, the customer is able to create or purchase new dictionaries and add them to the existing application. Dictionary service clients - your application code - retrieve an instance of this service, and the service will search, instantiate, and use Dictionary service providers.Īlthough the word-processor developer would most likely provide a basic, general dictionary with the original product, the customer might require a specialized dictionary, perhaps containing legal or technical terms. (See the section The Singleton Design Pattern for more information.) This object retrieves definitions of words from Dictionary providers. The DictionaryService provides a singleton DictionaryService object. ![]() One way is to define a service represented by a class named DictionaryService and a service provider interface named Dictionary. Dictionary Service ExampleĬonsider how you might design a dictionary service in a word processor or editor. An application with extensible services enable you, vendors, and customers to add service providers without modifying the original application. The SPI defines the classes and methods available to your application. Service provider interface (SPI) The set of public interfaces and abstract classes that a service defines. Instead, it relies on a service provider to implement that functionality. In the word-processor example, a dictionary service can define a way to retrieve a dictionary and the definition of a word, but it does not implement the underlying feature set. The service can define the interfaces for the functionality and a way to retrieve an implementation. The following are terms and definitions important to understand extensible applications: Service A set of programming interfaces and classes that provide access to some specific application functionality or feature. In this example, the word processor provides a dictionary or spelling feature that other developers, or even customers, can extend by providing their own implementation of the feature. One example of an extensible application is a word processor that allows the end user to add a new dictionary or spelling checker. By designing an extensible application, you provide a way to upgrade or enhance specific parts of a product without changing the core application. This section describes how to create applications with extensible services, which enable you or others to provide service implementations that require no modifications to the original application. Developers, software vendors, and customers can add new functionality or application programming interfaces (APIs) by adding a new Java Archive (JAR) file onto the application class path or into an application-specific extension directory. You can enhance its functionality with new plug-ins or modules. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |