The configuration interfaces mechanism allows working with application properties using Java interface methods, providing the following benefits:
-
Typed access – application code works with actual data types (String, Boolean, Integer etc.) and not only with strings.
-
The application code uses interface methods instead of string property identifiers, so IDE can prompt their names.
Example of transaction timeout value access in Middleware block:
@Inject
private ServerConfig serverConfig;
public void doSomething() {
int timeout = serverConfig.getDefaultQueryTimeoutSec();
...
}
If injection is impossible, the configuration interface reference can be obtained via Configuration infrastructure interface:
int timeout = AppBeans.get(Configuration.class)
.getConfig(ServerConfig.class)
.getDefaultQueryTimeoutSec();
Configuration interfaces are not regular Spring beans. They can only be obtained through explicit interface injection or
via Configuration.getConfig() but not through AppBeans.get() .
