optimize some code style

dubbo-common/src/main/java/org/apache/dubbo/common/utils/NetUtils.java

@@ -428,7 +428,7 @@ public static boolean matchIpRange(String pattern, String host, int port) throws
 
         host = inetAddress.getHostAddress();
 
-        String[] ip_address = host.split(splitCharacter);
+        String[] ipAddress = host.split(splitCharacter);
         if (pattern.equals(host)) {
             return true;
         }
@@ -442,7 +442,7 @@ public static boolean matchIpRange(String pattern, String host, int port) throws
             }
         }
         for (int i = 0; i < mask.length; i++) {
-            if (mask[i].equals("*") || mask[i].equals(ip_address[i])) {
+            if (mask[i].equals("*") || mask[i].equals(ipAddress[i])) {
                 continue;
             } else if (mask[i].contains("-")) {
                 String[] rangeNumStrs = mask[i].split("-");
@@ -451,13 +451,13 @@ public static boolean matchIpRange(String pattern, String host, int port) throws
                 }
                 Integer min = getNumOfIpSegment(rangeNumStrs[0], isIpv4);
                 Integer max = getNumOfIpSegment(rangeNumStrs[1], isIpv4);
-                Integer ip = getNumOfIpSegment(ip_address[i], isIpv4);
+                Integer ip = getNumOfIpSegment(ipAddress[i], isIpv4);
                 if (ip < min || ip > max) {
                     return false;
                 }
-            } else if ("0".equals(ip_address[i]) && ("0".equals(mask[i]) || "00".equals(mask[i]) || "000".equals(mask[i]) || "0000".equals(mask[i]))) {
+            } else if ("0".equals(ipAddress[i]) && ("0".equals(mask[i]) || "00".equals(mask[i]) || "000".equals(mask[i]) || "0000".equals(mask[i]))) {
                 continue;
-            } else if (!mask[i].equals(ip_address[i])) {
+            } else if (!mask[i].equals(ipAddress[i])) {
                 return false;
             }
         }

dubbo-metadata-report/dubbo-metadata-report-api/src/main/java/org/apache/dubbo/metadata/support/AbstractMetadataReport.java

@@ -74,7 +74,7 @@ public abstract class AbstractMetadataReport implements MetadataReport {
     boolean syncReport;
     // Local disk cache file
     File file;
-    private AtomicBoolean INIT = new AtomicBoolean(false);
+    private AtomicBoolean initialized = new AtomicBoolean(false);
     public MetadataReportRetry metadataReportRetry;
 
     public AbstractMetadataReport(URL reportServerURL) {
@@ -90,7 +90,7 @@ public AbstractMetadataReport(URL reportServerURL) {
                 }
             }
             // if this file exist, firstly delete it.
-            if (!INIT.getAndSet(true) && file.exists()) {
+            if (!initialized.getAndSet(true) && file.exists()) {
                 file.delete();
             }
         }

dubbo-monitor/dubbo-monitor-default/src/main/java/org/apache/dubbo/monitor/dubbo/MetricsFilter.java

@@ -185,8 +185,9 @@ private List<MetricObject> getThreadPoolMessage() {
     }
 
     private MetricObject value2MetricObject(String metric, Integer value, MetricLevel level) {
-        if (metric == null || value == null || level == null)
+        if (metric == null || value == null || level == null) {
             return null;
+        }
 
         return new MetricObject
                 .Builder(metric)

dubbo-plugin/dubbo-qos/src/main/java/org/apache/dubbo/qos/command/impl/Ls.java

@@ -45,7 +45,7 @@ public String execute(CommandContext commandContext, String[] args) {
     public String listProvider() {
         StringBuilder stringBuilder = new StringBuilder();
         stringBuilder.append("As Provider side:" + System.lineSeparator());
-        Collection<ProviderModel> ProviderModelList = ApplicationModel.allProviderModels();
+        Collection<ProviderModel> providerModelList = ApplicationModel.allProviderModels();
 
         TTable tTable = new TTable(new TTable.ColumnDefine[]{
                 new TTable.ColumnDefine(TTable.Align.MIDDLE),
@@ -56,7 +56,7 @@ public String listProvider() {
         tTable.addRow("Provider Service Name", "PUB");
 
         //Content
-        for (ProviderModel providerModel : ProviderModelList) {
+        for (ProviderModel providerModel : providerModelList) {
             tTable.addRow(providerModel.getServiceName(), isRegistered(providerModel.getServiceName()) ? "Y" : "N");
         }
         stringBuilder.append(tTable.rendering());

dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/integration/RegistryProtocol.java

@@ -296,18 +296,18 @@ private URL getRegisteredProviderUrl(final URL providerUrl, final URL registryUr
                     MONITOR_KEY, BIND_IP_KEY, BIND_PORT_KEY, QOS_ENABLE, QOS_PORT, ACCEPT_FOREIGN_IP, VALIDATION_KEY,
                     INTERFACES);
         } else {
-            String extra_keys = registryUrl.getParameter(EXTRA_KEYS_KEY, "");
+            String extraKeys = registryUrl.getParameter(EXTRA_KEYS_KEY, "");
             // if path is not the same as interface name then we should keep INTERFACE_KEY,
             // otherwise, the registry structure of zookeeper would be '/dubbo/path/providers',
             // but what we expect is '/dubbo/interface/providers'
             if (!providerUrl.getPath().equals(providerUrl.getParameter(Constants.INTERFACE_KEY))) {
-                if (StringUtils.isNotEmpty(extra_keys)) {
-                    extra_keys += ",";
+                if (StringUtils.isNotEmpty(extraKeys)) {
+                    extraKeys += ",";
                 }
-                extra_keys += Constants.INTERFACE_KEY;
+                extraKeys += Constants.INTERFACE_KEY;
             }
             String[] paramsToRegistry = getParamsToRegistry(DEFAULT_REGISTER_PROVIDER_KEYS
-                    , Constants.COMMA_SPLIT_PATTERN.split(extra_keys));
+                    , Constants.COMMA_SPLIT_PATTERN.split(extraKeys));
             return URL.valueOf(providerUrl, paramsToRegistry, providerUrl.getParameter(METHODS_KEY, (String[]) null));
         }
 

dubbo-registry/dubbo-registry-nacos/src/main/java/org/apache/dubbo/registry/nacos/NacosRegistryFactory.java

@@ -48,6 +48,7 @@ public class NacosRegistryFactory extends AbstractRegistryFactory {
 
     private final Logger logger = LoggerFactory.getLogger(getClass());
 
+    @Override
     protected Registry createRegistry(URL url) {
         return new NacosRegistry(url, buildNamingService(url));
     }

dubbo-remoting/dubbo-remoting-etcd3/src/main/java/org/apache/dubbo/remoting/etcd/jetcd/JEtcdClientWrapper.java

@@ -186,7 +186,9 @@ public List<String> getChildren(String path) {
                                     int index = len, count = 0;
                                     if (key.length() > len) {
                                         for (; (index = key.indexOf(Constants.PATH_SEPARATOR, index)) != -1; ++index) {
-                                            if (count++ > 1) break;
+                                            if (count++ > 1) {
+                                                break;
+                                            }
                                         }
                                     }
                                     return count == 1;

dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/filter/ActiveLimitFilter.java

@@ -47,12 +47,12 @@ public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcExcept
         String methodName = invocation.getMethodName();
         int max = invoker.getUrl().getMethodParameter(methodName, Constants.ACTIVES_KEY, 0);
         RpcStatus count = RpcStatus.getStatus(invoker.getUrl(), invocation.getMethodName());
-        if (!count.beginCount(url, methodName, max)) {
+        if (!RpcStatus.beginCount(url, methodName, max)) {
             long timeout = invoker.getUrl().getMethodParameter(invocation.getMethodName(), Constants.TIMEOUT_KEY, 0);
             long start = System.currentTimeMillis();
             long remain = timeout;
             synchronized (count) {
-                while (!count.beginCount(url, methodName, max)) {
+                while (!RpcStatus.beginCount(url, methodName, max)) {
                     try {
                         count.wait(remain);
                     } catch (InterruptedException e) {
@@ -79,7 +79,7 @@ public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcExcept
             isSuccess = false;
             throw t;
         } finally {
-            count.endCount(url, methodName, System.currentTimeMillis() - begin, isSuccess);
+            RpcStatus.endCount(url, methodName, System.currentTimeMillis() - begin, isSuccess);
             if (max > 0) {
                 synchronized (count) {
                     count.notifyAll();

dubbo-serialization/dubbo-serialization-gson/src/main/java/org/apache/dubbo/common/serialize/gson/GsonJsonObjectInput.java

@@ -107,7 +107,9 @@ public <T> T readObject(Class<T> cls, Type type) throws IOException, ClassNotFou
 
     private String readLine() throws IOException {
         String line = reader.readLine();
-        if (line == null || line.trim().length() == 0) throw new EOFException();
+        if (line == null || line.trim().length() == 0) {
+            throw new EOFException();
+        }
         return line;
     }