private Api getApiInternal(String apiOrgId, String apiId, String apiVersion) {
        String key = getApiIndex(apiOrgId, apiId, apiVersion);
        Api api;
        synchronized (mutex) {
            api = (Api) getMap().get(key);
        }
        return api;
    }
Gets an API by its unique identifying info (orgid, id, version).

@return an Api or null if not found
gateway/engine/core/src/main/java/io/apiman/gateway/engine/impl/InMemoryRegistry.java