Config Annotation binding?

[Guoqin Zheng]

Hey all,

I am trying to inject configuration pojo with guice by annotation. But I
find difficulty to do that. Basically what I want to achieve is like
following:

Say I have the following classes

@Retention(RUNTIME)
@Target({ FIELD, PARAMETER })
@BindingAnnotation
public @interface Config {
/**
* The config key to bind
*/
String key();
}


/**
* A tag interface to indicate that a class is a Configuration.

*/
public interface Configuration {

}


/**
* An example: App Configuration
*/

public class AppConfiguration implements Configuration {
private String appId;
private String appOwner;
private String appDesc;
}



/**
* Another config example: MySql Connection setting
*/

public static class MysqlConnection implements Configuration {
private String host;
private int port;
private int timeout;
}


You could define any other configuration POJOs.


Also, assuming I have a config provider that could load the config file and map to the pojo:


public interface ConfigurationProvider {

/**
* Get the configuration pojo at the node path
*/
<T extends Configuration> T getConfiguration(
Class<T> configKlass,
String nodePath) throws ConfigurationProviderException;
}


Now, I would like Guice to inject these configuration somehow like:


public class MyService {
@Inject
public MyService(
@Config("app_config")Configuration.AppConfiguration appConfig,
@Config("mysql_conn")Configuration.MysqlConnection mysqlConnection) {

}
}


Just curious if this is possible with Guice injection? If yes, how can I achieve that?


Thank you!