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From "Edward Capriolo (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-6881) Replace static singletons potentially use dependency injection
Date Tue, 18 Mar 2014 14:39:54 GMT

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

Edward Capriolo updated CASSANDRA-6881:
---------------------------------------

    Summary: Replace static singletons potentially use dependency injection  (was: Replace
static singletons potentiall use dependency injection)

> Replace static singletons potentially use 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.



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