Dependencies

[Michiel ten Hagen]

All

I have two classes, Cache and CacheMonitor.  If someone binds the Cache I want the CacheMonitor to be initiated.

Currently I have the Cache class depend on the CacheMonitor but this creates a unnecassary dependency, the Cache should be able to be used without the CacheMonitor.

Is there a way to specify that CacheMonitor should be loaded only if the Cache is binded?

Regards,

Michiel

[Nate Bauernfeind]

Maybe you want to make CacheMonitor an optional dependency?

See: https://github.com/google/guice/wiki/Injections#optional-injections

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[Fred Faber]

An idiomatic solution is to create a CacheModule which you would ask clients of Cache to install.

Within the module you would:

1. create the binding for Cache
2. add any additional logic for your CacheMonitor

Not knowing anything about either of these classes it's difficult to say what (2) would look like. If there is significant work to "initiate" the monitor then consider binding this as a Guava Service and using a ServiceManager to execute the logic within your server's main().

Fred