DCAE-Controller : Loading of CDAP Configuration, Preferences...

Hi,

I'm trying to understand -

1. How DCAE-Collector is sending Configuration & Preferences to TCA(CDAP)?
2. From where those configuration data are comming to DCAE-Collector?

I see in CdapPackageImpl.initializePackageContents(), this configuration are created as follows -

initEClass(cdapInternalApplicationConfigurationEClass, CdapInternalApplicationConfiguration.class, "CdapInternalApplicationConfiguration", !IS_ABSTRACT, !IS_INTERFACE, IS_GENERATED_INSTANCE_CLASS);
initEReference(getCdapInternalApplicationConfiguration_Config(), theCdapPackage_1.getCdapKeyPair(), null, "config", null, 0, -1, CdapInternalApplicationConfiguration.class, !IS_TRANSIENT, !IS_VOLATILE, IS_CHANGEABLE, IS_COMPOSITE, !IS_RESOLVE_PROXIES, !IS_UNSETTABLE, IS_UNIQUE, !IS_DERIVED, !IS_ORDERED);
initEReference(getCdapInternalApplicationConfiguration_Preferences(), theCdapPackage_1.getCdapKeyPair(), null, "preferences", null, 0, -1, CdapInternalApplicationConfiguration.class, !IS_TRANSIENT, !IS_VOLATILE, IS_CHANGEABLE, IS_COMPOSITE, !IS_RESOLVE_PROXIES, !IS_UNSETTABLE, IS_UNIQUE, !IS_DERIVED, !IS_ORDERED);
initEReference(getCdapInternalApplicationConfiguration_Apps(), theCdapPackage_1.getCdapEntityWithPreferences(), null, "apps", null, 0, -1, CdapInternalApplicationConfiguration.class, !IS_TRANSIENT, !IS_VOLATILE, IS_CHANGEABLE, IS_COMPOSITE, !IS_RESOLVE_PROXIES, !IS_UNSETTABLE, IS_UNIQUE, !IS_DERIVED, !IS_ORDERED);
initEReference(getCdapInternalApplicationConfiguration_Workers(), theCdapPackage_1.getCdapEntityWithPreferences(), null, "workers", null, 0, -1, CdapInternalApplicationConfiguration.class, !IS_TRANSIENT, !IS_VOLATILE, IS_CHANGEABLE, IS_COMPOSITE, !IS_RESOLVE_PROXIES, !IS_UNSETTABLE, IS_UNIQUE, !IS_DERIVED, !IS_ORDERED);
initEReference(getCdapInternalApplicationConfiguration_Flows(), theCdapPackage_1.getCdapEntityWithPreferences(), null, "flows", null, 0, -1, CdapInternalApplicationConfiguration.class, !IS_TRANSIENT, !IS_VOLATILE, IS_CHANGEABLE, IS_COMPOSITE, !IS_RESOLVE_PROXIES, !IS_UNSETTABLE, IS_UNIQUE, !IS_DERIVED, !IS_ORDERED);
initEReference(getCdapInternalApplicationConfiguration_Services(), theCdapPackage_1.getCdapEntityWithPreferences(), null, "services", null, 0, -1, CdapInternalApplicationConfiguration.class, !IS_TRANSIENT, !IS_VOLATILE, IS_CHANGEABLE, IS_COMPOSITE, !IS_RESOLVE_PROXIES, !IS_UNSETTABLE, IS_UNIQUE, !IS_DERIVED, !IS_ORDERED);
......
Can someone please tell me  -

1.  Where those values are coming from?
2. How initEClass(), initEReference() work? or where I can get doc on it?
3. What does bellow line mean?

org.openecomp.ncomp.cdap.CdapPackage theCdapPackage_1 = (org.openecomp.ncomp.cdap.CdapPackage)EPackage.Registry.INSTANCE.getEPackage(org.openecomp.ncomp.cdap.CdapPackage.eNS_URI);