factor out interfaces for common methods to facilitate easier testing [DATACOUCH-675]

**[Michael Reiche](https://jira.spring.io/secure/ViewProfile.jspa?name=mikereiche)** opened **[DATACOUCH-675](https://jira.spring.io/browse/DATACOUCH-675?redirect=false)** and commented


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No further details from [DATACOUCH-675](https://jira.spring.io/browse/DATACOUCH-675?redirect=false)