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https://issues.apache.org/jira/browse/CASSANDRA-6881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13939419#comment-13939419
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Edward Capriolo commented on CASSANDRA-6881:
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"There are 4.5k occurences of "static final" in the code base. "
I realize this, but if we do not do this now, there might be 8.5k occurrences
by next time someone brings it up. :)
> Replace static singletons potentially using dependency injection
> ----------------------------------------------------------------
>
> Key: CASSANDRA-6881
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6881
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Edward Capriolo
> Assignee: Edward Capriolo
>
> I have noticed several places in the cassandra codebase where
> unit,functional, and end-to-end testing is made more difficult due to the
> pattern of using singleton objects with static initialization.
> An example is StorageProxy
> {code}static final boolean OPTIMIZE_LOCAL_REQUESTS = true; // set to false to
> test messagingservice path on single node
> {code}
> There is no coverage for this. It turns out to be very difficult to test for
> a variety of reasons. Mostly that everything it interacts with is hidden
> behind other static singletons.
> The goal here would be to remove static stuff, have have a context, (spring,
> guice, or do out own). For the majority of things stop accessing them through
> static singleton, instead pass the objects (DatabaseDescriptor, Storageproxy)
> around or get them from the context. I think this will make a clearer API and
> allow us to provide better coverage on features that cross cut the
> components. It will *also* provide us better isolation for things like
> triggers/ udfs/ as they wont be able to acquire references to things they
> should not be able to.
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