[jira] [Updated] (CASSANDRA-6881) Replace static singletons potentially using dependency injection

["Edward Capriolo (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-6881?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Edward Capriolo updated CASSANDRA-6881:
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    Summary: Replace static singletons potentially using dependency injection  (was: Replace static singletons potentially use dependency injection)

> 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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