@Override
    protected Object doHandle(final String handle, final List<CommonUpstream> aliveList) {
        List<DubboUpstream> existList = updateStatusAndFilter(convert(handle), aliveList);
        aliveList.stream().filter(alive -> existList.stream().noneMatch(valid -> valid.getUpstreamUrl().equals(alive.getUpstreamUrl())))
                .forEach(alive -> existList.add(CommonUpstreamUtils.buildAliveDubboUpstream(alive.getUpstreamUrl())));
        existList.removeIf(e -> aliveList.stream().noneMatch(alive -> alive.getUpstreamUrl().equals(e.getUpstreamUrl())));
        return existList;
    }
The type Dubbo selector handle converter.
shenyu-admin/src/main/java/org/apache/shenyu/admin/service/converter/DubboSelectorHandleConverter.java