public static String buildRelationId(EndpointRelationDefine define) {
            return define.sourceServiceId
                + Const.RELATION_ID_CONNECTOR
                + encode(define.source)
                + Const.RELATION_ID_CONNECTOR
                + define.destServiceId
                + Const.RELATION_ID_CONNECTOR
                + encode(define.dest);
        }
@return the endpoint relationship string id.
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/IDManager.java