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​​