JadConfig classpathRepository 扩展

JadConfig 默认包含了基于内存，properties 文件，系统属性，以及环境变量的Repository，但是对于classpath 的文件处理不是很方便
我们可以自己在扩展

接口实现定义

 

public interface Repository {

 

    /**

     * Opens the configuration repository, e. g. create a database connection, open a file on disk for reading

     *

     * @throws RepositoryException If an error occurred while opening the data source

     */

    void open() throws RepositoryException;

 

    /**

     * Reads the configuration parameter {@literal name} from the backing data source. The {@literal name} is specific

     * to the underlying data source.

     *

     * @param name The parameter name

     * @return The value of the provided {@literal name} as {@link String}

     */

    String read(String name);

 

    /**

     * Closes the underlying data source when it isn't require any more.

     *

     * @throws RepositoryException If an error occurred while closing the underlying data source

     */

    void close() throws RepositoryException;

}

参考实现

public class ClassPathRepository implements Repository {

    private final Properties PROPERTIES = new Properties();

 

    private String fileName = null;

 

    public ClassPathRepository(String filename) {

        this.fileName = filename;

    }

 

    @Override

    public void open() throws RepositoryException {

        if (fileName == null) {

            throw new RepositoryException("Properties file must not be null!");

        }

        InputStream inputStream = null;

        try {

            inputStream = ClassPathRepository.class.getClassLoader().getResourceAsStream(fileName);

            PROPERTIES.load(inputStream);

        } catch (IOException ex) {

            throw new RepositoryException("Couldn't open properties file: " + fileName, ex);

        } finally {

            if (inputStream != null) {

                try {

                    inputStream.close();

                } catch (IOException e) {

                    // Intentionally empty

                }

            }

        }

 

    }

 

    @Override

    public String read(String name) {

        return PROPERTIES.getProperty(name);

    }

 

    @Override

    public void close() throws RepositoryException {

 

    }

}

使用

 JadConfig jadConfig = new JadConfig(new ClassPathRepository("app.properties"),bean);

 jadConfig.process();

说明

以上是一个简单的classpathRepository实现，实际上我们也可以基于其他文件扩展，比如yaml ，nacos 等，可以方便的实现配置管理，JadConfig 对于配置的管理方式还是很支持的借鉴学习的，比如dremio 对于配置也实现了类似的能力，包含check，validator。。。。

参考资料

https://github.com/Graylog2/JadConfig