@Override
    public URL mergeUrl(URL remoteUrl, Map<String, String> localParametersMap) {
        Map<String, String> map = new HashMap<>();
        Map<String, String> remoteMap = remoteUrl.getParameters();

        if (remoteMap != null && remoteMap.size() > 0) {
            map.putAll(remoteMap);

            // Remove configurations from provider, some items should be affected by provider.
            map.remove(THREAD_NAME_KEY);
            map.remove(DEFAULT_KEY_PREFIX + THREAD_NAME_KEY);

            map.remove(THREADPOOL_KEY);
            map.remove(DEFAULT_KEY_PREFIX + THREADPOOL_KEY);

            map.remove(CORE_THREADS_KEY);
            map.remove(DEFAULT_KEY_PREFIX + CORE_THREADS_KEY);

            map.remove(THREADS_KEY);
            map.remove(DEFAULT_KEY_PREFIX + THREADS_KEY);

            map.remove(QUEUES_KEY);
            map.remove(DEFAULT_KEY_PREFIX + QUEUES_KEY);

            map.remove(ALIVE_KEY);
            map.remove(DEFAULT_KEY_PREFIX + ALIVE_KEY);

            map.remove(Constants.TRANSPORTER_KEY);
            map.remove(DEFAULT_KEY_PREFIX + Constants.TRANSPORTER_KEY);
        }

        if (localParametersMap != null && localParametersMap.size() > 0) {
            Map<String, String> copyOfLocalMap = new HashMap<>(localParametersMap);

            if (map.containsKey(GROUP_KEY)) {
                copyOfLocalMap.remove(GROUP_KEY);
            }
            if (map.containsKey(VERSION_KEY)) {
                copyOfLocalMap.remove(VERSION_KEY);
            }
            if (map.containsKey(GENERIC_KEY)) {
                copyOfLocalMap.remove(GENERIC_KEY);
            }

            copyOfLocalMap.remove(RELEASE_KEY);
            copyOfLocalMap.remove(DUBBO_VERSION_KEY);
            copyOfLocalMap.remove(METHODS_KEY);
            copyOfLocalMap.remove(TIMESTAMP_KEY);
            copyOfLocalMap.remove(TAG_KEY);

            map.putAll(copyOfLocalMap);

            if (remoteMap != null) {
                map.put(REMOTE_APPLICATION_KEY, remoteMap.get(APPLICATION_KEY));

                // Combine filters and listeners on Provider and Consumer
                String remoteFilter = remoteMap.get(REFERENCE_FILTER_KEY);
                String localFilter = copyOfLocalMap.get(REFERENCE_FILTER_KEY);
                if (remoteFilter != null
                        && remoteFilter.length() > 0
                        && localFilter != null
                        && localFilter.length() > 0) {
                    map.put(REFERENCE_FILTER_KEY, remoteFilter + "," + localFilter);
                }
                String remoteListener = remoteMap.get(INVOKER_LISTENER_KEY);
                String localListener = copyOfLocalMap.get(INVOKER_LISTENER_KEY);
                if (remoteListener != null
                        && remoteListener.length() > 0
                        && localListener != null
                        && localListener.length() > 0) {
                    map.put(INVOKER_LISTENER_KEY, remoteListener + "," + localListener);
                }
            }
        }

        return remoteUrl.clearParameters().addParameters(map);
    }
@Test
    void testUseProviderParams() {
        // present in both local and remote, but uses remote value.
        URL localURL =
                URL.valueOf("dubbo://localhost:20880/DemoService?version=local&group=local&dubbo=local&release=local"
                        + "&methods=local&tag=local&timestamp=local");
        URL remoteURL = URL.valueOf(
                "dubbo://localhost:20880/DemoService?version=remote&group=remote&dubbo=remote&release=remote"
                        + "&methods=remote&tag=remote&timestamp=remote");
        URL mergedUrl = providerURLMergeProcessor.mergeUrl(remoteURL, localURL.getParameters());

        Assertions.assertEquals(remoteURL.getVersion(), mergedUrl.getVersion());
        Assertions.assertEquals(remoteURL.getGroup(), mergedUrl.getGroup());
        Assertions.assertEquals(remoteURL.getParameter(DUBBO_VERSION_KEY), mergedUrl.getParameter(DUBBO_VERSION_KEY));
        Assertions.assertEquals(remoteURL.getParameter(RELEASE_KEY), mergedUrl.getParameter(RELEASE_KEY));
        Assertions.assertEquals(remoteURL.getParameter(METHODS_KEY), mergedUrl.getParameter(METHODS_KEY));
        Assertions.assertEquals(remoteURL.getParameter(TIMESTAMP_KEY), mergedUrl.getParameter(TIMESTAMP_KEY));
        Assertions.assertEquals(remoteURL.getParameter(TAG_KEY), mergedUrl.getParameter(TAG_KEY));

        // present in local url but not in remote url, parameters of remote url is empty
        localURL = URL.valueOf("dubbo://localhost:20880/DemoService?version=local&group=local&dubbo=local&release=local"
                + "&methods=local&tag=local&timestamp=local");
        remoteURL = URL.valueOf("dubbo://localhost:20880/DemoService");
        mergedUrl = providerURLMergeProcessor.mergeUrl(remoteURL, localURL.getParameters());

        Assertions.assertEquals(localURL.getVersion(), mergedUrl.getVersion());
        Assertions.assertEquals(localURL.getGroup(), mergedUrl.getGroup());
        Assertions.assertNull(mergedUrl.getParameter(DUBBO_VERSION_KEY));
        Assertions.assertNull(mergedUrl.getParameter(RELEASE_KEY));
        Assertions.assertNull(mergedUrl.getParameter(METHODS_KEY));
        Assertions.assertNull(mergedUrl.getParameter(TIMESTAMP_KEY));
        Assertions.assertNull(mergedUrl.getParameter(TAG_KEY));

        // present in local url but not in remote url
        localURL = URL.valueOf("dubbo://localhost:20880/DemoService?version=local&group=local&dubbo=local&release=local"
                + "&methods=local&tag=local&timestamp=local");
        remoteURL = URL.valueOf("dubbo://localhost:20880/DemoService?key=value");
        mergedUrl = providerURLMergeProcessor.mergeUrl(remoteURL, localURL.getParameters());

        Assertions.assertEquals(localURL.getVersion(), mergedUrl.getVersion());
        Assertions.assertEquals(localURL.getGroup(), mergedUrl.getGroup());
        Assertions.assertNull(mergedUrl.getParameter(DUBBO_VERSION_KEY));
        Assertions.assertNull(mergedUrl.getParameter(RELEASE_KEY));
        Assertions.assertNull(mergedUrl.getParameter(METHODS_KEY));
        Assertions.assertNull(mergedUrl.getParameter(TIMESTAMP_KEY));
        Assertions.assertNull(mergedUrl.getParameter(TAG_KEY));

        // present in both local and remote, uses local url params
        localURL = URL.valueOf("dubbo://localhost:20880/DemoService?loadbalance=local&timeout=1000&cluster=local");
        remoteURL = URL.valueOf("dubbo://localhost:20880/DemoService?loadbalance=remote&timeout=2000&cluster=remote");
        mergedUrl = providerURLMergeProcessor.mergeUrl(remoteURL, localURL.getParameters());

        Assertions.assertEquals(localURL.getParameter(CLUSTER_KEY), mergedUrl.getParameter(CLUSTER_KEY));
        Assertions.assertEquals(localURL.getParameter(TIMEOUT_KEY), mergedUrl.getParameter(TIMEOUT_KEY));
        Assertions.assertEquals(localURL.getParameter(LOADBALANCE_KEY), mergedUrl.getParameter(LOADBALANCE_KEY));
    }