Protect cache get operation with a lock (#674)
Protect cache get operation with a lock (#674)

Signed-off-by: Plamen Doychev <d3e9917358ad8b9235d847739ba7e90655242992@sap.com>
cloudfoundry-incubator/cf-abacus,cloudfoundry-incubator/cf-abacus,cloudfoundry-incubator/cf-abacus