What is the use of SET_INJECTION & few other methods in DPC class of OData service?

Hello,

I can see there are few methods in DPC class like below.

1] /IWBEP/IF_SB_DPC_COMM_SERVICES~SET_INJECTION

2] /IWBEP/IF_SB_DPC_COMM_SERVICES~GET_GENERATION_STRATEGY

3] /IWBEP/IF_MGW_APPL_SRV_RUNTIME~GET_IS_CONDITIONAL_IMPLEMENTED

4] /IWBEP/IF_MGW_CONV_SRV_RUNTIME~GET_RESPONSE_UTIL

5] /IWBEP/IF_MGW_SOST_SRV_RUNTIME~OPERATION_START

What are these methods used for?