@ConfigurationProperties should have an option to have properties read each time from Environment

Originally raised on the SPR issue tracker: https://jira.springsource.org/browse/SPR-11289

@ConfigurationProperties objects should have some mechanism for allowing some or all properties to be read from a propertySource on each get invocation. It seems like instead of injected a concrete implementation into the AppContext we should inject a proxy for the Config object which can reference the Environment abstraction.

The usecase for this would be when we have implemented a custom PropertySource which is aware of property changes.

[dsyer]

FYI spring-cloud-config isn’t needed for @RefreshScope, and also @RefreshScope is not needed for @ConfigurationProperties. Just put spring-cloud-commons on the classpath - it’s very lightweight, really - the only dependency is Spring Boot.

[Code2Life]

Hi @philwebb @dsyer @wilkinsona,

I think the original feature this issue requests have been implemented in my project: https://github.com/Code2Life/spring-boot-dynamic-config

Adding @DynamicConfig on @ConfigurationProperties simply works !

With Spring Boot native features leveraged, and with the file watcher and hot-reload mechanism implemented by only 400+ lines of code, @Value @ConfigurationProperties could always be the newest value.

This lib is widely used in 20+ core applications for more than half a year in the company I’m working for. Hope this feature becomes a built-in feature of Spring Boot. @philwebb @dsyer @wilkinsona Would you like to take a look at the source codes and put some suggestions? Thanks !