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iluo pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/incubator-dubbo.git


The following commit(s) were added to refs/heads/master by this push:
     new 70edcf8  optimize constant naming style (#3970)
70edcf8 is described below

commit 70edcf80e95f73390ece1527e982e1e9fa04037b
Author: jimin <sliev...@163.com>
AuthorDate: Sun May 5 14:01:35 2019 +0800

    optimize constant naming style (#3970)
---
 .../dubbo/rpc/cluster/merger/MergerFactory.java    | 12 +++++-----
 .../org/apache/dubbo/common/bytecode/Proxy.java    | 12 +++++-----
 .../common/threadlocal/InternalThreadLocal.java    | 10 ++++-----
 .../common/threadlocal/InternalThreadLocalMap.java |  8 +++----
 .../dubbo/common/utils/AtomicPositiveInteger.java  | 26 +++++++++++-----------
 .../apache/dubbo/common/utils/ExecutorUtil.java    |  4 ++--
 .../org/apache/dubbo/common/utils/NetUtils.java    |  6 ++---
 .../org/apache/dubbo/config/AbstractConfig.java    | 18 +++++++--------
 .../org/apache/dubbo/config/DubboShutdownHook.java |  4 ++--
 .../org/apache/dubbo/config/ReferenceConfig.java   | 20 ++++++++---------
 .../apache/dubbo/config/context/ConfigManager.java |  4 ++--
 .../dubbo/config/utils/ReferenceConfigCache.java   |  8 +++----
 .../config/utils/ReferenceConfigCacheTest.java     |  2 +-
 .../spring/extension/SpringExtensionFactory.java   | 18 +++++++--------
 .../registry/integration/RegistryDirectory.java    | 18 +++++++--------
 .../remoting/http/servlet/ServletManager.java      |  4 ++--
 .../dubbo/remoting/transport/mina/MinaClient.java  |  6 ++---
 .../remoting/transport/netty/NettyChannel.java     |  8 +++----
 .../remoting/transport/netty/NettyClient.java      |  4 ++--
 .../remoting/transport/netty4/NettyChannel.java    |  8 +++----
 .../zookeeper/curator/CuratorZookeeperClient.java  | 12 +++++-----
 .../apache/dubbo/rpc/filter/AccessLogFilter.java   | 12 +++++-----
 .../apache/dubbo/rpc/model/ApplicationModel.java   | 20 ++++++++---------
 .../rpc/protocol/dubbo/CallbackServiceCodec.java   |  6 ++---
 .../rpc/protocol/http/HttpRemoteInvocation.java    |  6 ++---
 .../dubbo/rpc/protocol/thrift/ThriftCodec.java     | 24 ++++++++++----------
 .../dubbo/rpc/protocol/thrift/ThriftType.java      |  6 ++---
 .../dubbo/rpc/protocol/thrift/ThriftCodecTest.java |  4 ++--
 .../support/SerializableClassRegistry.java         |  6 ++---
 29 files changed, 148 insertions(+), 148 deletions(-)

diff --git 
a/dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/merger/MergerFactory.java
 
b/dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/merger/MergerFactory.java
index 845d21a..74789bb 100644
--- 
a/dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/merger/MergerFactory.java
+++ 
b/dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/merger/MergerFactory.java
@@ -27,7 +27,7 @@ import java.util.concurrent.ConcurrentMap;
 
 public class MergerFactory {
 
-    private static final ConcurrentMap<Class<?>, Merger<?>> mergerCache =
+    private static final ConcurrentMap<Class<?>, Merger<?>> MERGER_CACHE =
             new ConcurrentHashMap<Class<?>, Merger<?>>();
 
     /**
@@ -46,19 +46,19 @@ public class MergerFactory {
         Merger result;
         if (returnType.isArray()) {
             Class type = returnType.getComponentType();
-            result = mergerCache.get(type);
+            result = MERGER_CACHE.get(type);
             if (result == null) {
                 loadMergers();
-                result = mergerCache.get(type);
+                result = MERGER_CACHE.get(type);
             }
             if (result == null && !type.isPrimitive()) {
                 result = ArrayMerger.INSTANCE;
             }
         } else {
-            result = mergerCache.get(returnType);
+            result = MERGER_CACHE.get(returnType);
             if (result == null) {
                 loadMergers();
-                result = mergerCache.get(returnType);
+                result = MERGER_CACHE.get(returnType);
             }
         }
         return result;
@@ -69,7 +69,7 @@ public class MergerFactory {
                 .getSupportedExtensions();
         for (String name : names) {
             Merger m = 
ExtensionLoader.getExtensionLoader(Merger.class).getExtension(name);
-            
mergerCache.putIfAbsent(ReflectUtils.getGenericClass(m.getClass()), m);
+            
MERGER_CACHE.putIfAbsent(ReflectUtils.getGenericClass(m.getClass()), m);
         }
     }
 
diff --git 
a/dubbo-common/src/main/java/org/apache/dubbo/common/bytecode/Proxy.java 
b/dubbo-common/src/main/java/org/apache/dubbo/common/bytecode/Proxy.java
index 8381bd2..8486e94 100644
--- a/dubbo-common/src/main/java/org/apache/dubbo/common/bytecode/Proxy.java
+++ b/dubbo-common/src/main/java/org/apache/dubbo/common/bytecode/Proxy.java
@@ -48,9 +48,9 @@ public abstract class Proxy {
     };
     private static final AtomicLong PROXY_CLASS_COUNTER = new AtomicLong(0);
     private static final String PACKAGE_NAME = 
Proxy.class.getPackage().getName();
-    private static final Map<ClassLoader, Map<String, Object>> ProxyCacheMap = 
new WeakHashMap<ClassLoader, Map<String, Object>>();
+    private static final Map<ClassLoader, Map<String, Object>> PROXY_CACHE_MAP 
= new WeakHashMap<ClassLoader, Map<String, Object>>();
 
-    private static final Object PendingGenerationMarker = new Object();
+    private static final Object PENDING_GENERATION_MARKER = new Object();
 
     protected Proxy() {
     }
@@ -102,8 +102,8 @@ public abstract class Proxy {
 
         // get cache by class loader.
         Map<String, Object> cache;
-        synchronized (ProxyCacheMap) {
-            cache = ProxyCacheMap.computeIfAbsent(cl, k -> new HashMap<>());
+        synchronized (PROXY_CACHE_MAP) {
+            cache = PROXY_CACHE_MAP.computeIfAbsent(cl, k -> new HashMap<>());
         }
 
         Proxy proxy = null;
@@ -117,13 +117,13 @@ public abstract class Proxy {
                     }
                 }
 
-                if (value == PendingGenerationMarker) {
+                if (value == PENDING_GENERATION_MARKER) {
                     try {
                         cache.wait();
                     } catch (InterruptedException e) {
                     }
                 } else {
-                    cache.put(key, PendingGenerationMarker);
+                    cache.put(key, PENDING_GENERATION_MARKER);
                     break;
                 }
             }
diff --git 
a/dubbo-common/src/main/java/org/apache/dubbo/common/threadlocal/InternalThreadLocal.java
 
b/dubbo-common/src/main/java/org/apache/dubbo/common/threadlocal/InternalThreadLocal.java
index ac887e4..8820f12 100644
--- 
a/dubbo-common/src/main/java/org/apache/dubbo/common/threadlocal/InternalThreadLocal.java
+++ 
b/dubbo-common/src/main/java/org/apache/dubbo/common/threadlocal/InternalThreadLocal.java
@@ -33,7 +33,7 @@ import java.util.Set;
  */
 public class InternalThreadLocal<V> {
 
-    private static final int variablesToRemoveIndex = 
InternalThreadLocalMap.nextVariableIndex();
+    private static final int VARIABLES_TO_REMOVE_INDEX = 
InternalThreadLocalMap.nextVariableIndex();
 
     private final int index;
 
@@ -54,7 +54,7 @@ public class InternalThreadLocal<V> {
         }
 
         try {
-            Object v = threadLocalMap.indexedVariable(variablesToRemoveIndex);
+            Object v = 
threadLocalMap.indexedVariable(VARIABLES_TO_REMOVE_INDEX);
             if (v != null && v != InternalThreadLocalMap.UNSET) {
                 Set<InternalThreadLocal<?>> variablesToRemove = 
(Set<InternalThreadLocal<?>>) v;
                 InternalThreadLocal<?>[] variablesToRemoveArray =
@@ -86,11 +86,11 @@ public class InternalThreadLocal<V> {
 
     @SuppressWarnings("unchecked")
     private static void addToVariablesToRemove(InternalThreadLocalMap 
threadLocalMap, InternalThreadLocal<?> variable) {
-        Object v = threadLocalMap.indexedVariable(variablesToRemoveIndex);
+        Object v = threadLocalMap.indexedVariable(VARIABLES_TO_REMOVE_INDEX);
         Set<InternalThreadLocal<?>> variablesToRemove;
         if (v == InternalThreadLocalMap.UNSET || v == null) {
             variablesToRemove = Collections.newSetFromMap(new 
IdentityHashMap<InternalThreadLocal<?>, Boolean>());
-            threadLocalMap.setIndexedVariable(variablesToRemoveIndex, 
variablesToRemove);
+            threadLocalMap.setIndexedVariable(VARIABLES_TO_REMOVE_INDEX, 
variablesToRemove);
         } else {
             variablesToRemove = (Set<InternalThreadLocal<?>>) v;
         }
@@ -101,7 +101,7 @@ public class InternalThreadLocal<V> {
     @SuppressWarnings("unchecked")
     private static void removeFromVariablesToRemove(InternalThreadLocalMap 
threadLocalMap, InternalThreadLocal<?> variable) {
 
-        Object v = threadLocalMap.indexedVariable(variablesToRemoveIndex);
+        Object v = threadLocalMap.indexedVariable(VARIABLES_TO_REMOVE_INDEX);
 
         if (v == InternalThreadLocalMap.UNSET || v == null) {
             return;
diff --git 
a/dubbo-common/src/main/java/org/apache/dubbo/common/threadlocal/InternalThreadLocalMap.java
 
b/dubbo-common/src/main/java/org/apache/dubbo/common/threadlocal/InternalThreadLocalMap.java
index 46d9ec4..9b38eb4 100644
--- 
a/dubbo-common/src/main/java/org/apache/dubbo/common/threadlocal/InternalThreadLocalMap.java
+++ 
b/dubbo-common/src/main/java/org/apache/dubbo/common/threadlocal/InternalThreadLocalMap.java
@@ -30,7 +30,7 @@ public final class InternalThreadLocalMap {
 
     private static ThreadLocal<InternalThreadLocalMap> slowThreadLocalMap = 
new ThreadLocal<InternalThreadLocalMap>();
 
-    private static final AtomicInteger nextIndex = new AtomicInteger();
+    private static final AtomicInteger NEXT_INDEX = new AtomicInteger();
 
     public static final Object UNSET = new Object();
 
@@ -64,16 +64,16 @@ public final class InternalThreadLocalMap {
     }
 
     public static int nextVariableIndex() {
-        int index = nextIndex.getAndIncrement();
+        int index = NEXT_INDEX.getAndIncrement();
         if (index < 0) {
-            nextIndex.decrementAndGet();
+            NEXT_INDEX.decrementAndGet();
             throw new IllegalStateException("Too many thread-local indexed 
variables");
         }
         return index;
     }
 
     public static int lastVariableIndex() {
-        return nextIndex.get() - 1;
+        return NEXT_INDEX.get() - 1;
     }
 
     private InternalThreadLocalMap() {
diff --git 
a/dubbo-common/src/main/java/org/apache/dubbo/common/utils/AtomicPositiveInteger.java
 
b/dubbo-common/src/main/java/org/apache/dubbo/common/utils/AtomicPositiveInteger.java
index 4a13c6c..63b9ab8 100644
--- 
a/dubbo-common/src/main/java/org/apache/dubbo/common/utils/AtomicPositiveInteger.java
+++ 
b/dubbo-common/src/main/java/org/apache/dubbo/common/utils/AtomicPositiveInteger.java
@@ -22,7 +22,7 @@ public class AtomicPositiveInteger extends Number {
 
     private static final long serialVersionUID = -3038533876489105940L;
 
-    private static final AtomicIntegerFieldUpdater<AtomicPositiveInteger> 
indexUpdater =
+    private static final AtomicIntegerFieldUpdater<AtomicPositiveInteger> 
INDEX_UPDATER =
             AtomicIntegerFieldUpdater.newUpdater(AtomicPositiveInteger.class, 
"index");
 
     @SuppressWarnings("unused")
@@ -32,69 +32,69 @@ public class AtomicPositiveInteger extends Number {
     }
 
     public AtomicPositiveInteger(int initialValue) {
-        indexUpdater.set(this, initialValue);
+        INDEX_UPDATER.set(this, initialValue);
     }
 
     public final int getAndIncrement() {
-        return indexUpdater.getAndIncrement(this) & Integer.MAX_VALUE;
+        return INDEX_UPDATER.getAndIncrement(this) & Integer.MAX_VALUE;
     }
 
     public final int getAndDecrement() {
-        return indexUpdater.getAndDecrement(this) & Integer.MAX_VALUE;
+        return INDEX_UPDATER.getAndDecrement(this) & Integer.MAX_VALUE;
     }
 
     public final int incrementAndGet() {
-        return indexUpdater.incrementAndGet(this) & Integer.MAX_VALUE;
+        return INDEX_UPDATER.incrementAndGet(this) & Integer.MAX_VALUE;
     }
 
     public final int decrementAndGet() {
-        return indexUpdater.decrementAndGet(this) & Integer.MAX_VALUE;
+        return INDEX_UPDATER.decrementAndGet(this) & Integer.MAX_VALUE;
     }
 
     public final int get() {
-        return indexUpdater.get(this) & Integer.MAX_VALUE;
+        return INDEX_UPDATER.get(this) & Integer.MAX_VALUE;
     }
 
     public final void set(int newValue) {
         if (newValue < 0) {
             throw new IllegalArgumentException("new value " + newValue + " < 
0");
         }
-        indexUpdater.set(this, newValue);
+        INDEX_UPDATER.set(this, newValue);
     }
 
     public final int getAndSet(int newValue) {
         if (newValue < 0) {
             throw new IllegalArgumentException("new value " + newValue + " < 
0");
         }
-        return indexUpdater.getAndSet(this, newValue) & Integer.MAX_VALUE;
+        return INDEX_UPDATER.getAndSet(this, newValue) & Integer.MAX_VALUE;
     }
 
     public final int getAndAdd(int delta) {
         if (delta < 0) {
             throw new IllegalArgumentException("delta " + delta + " < 0");
         }
-        return indexUpdater.getAndAdd(this, delta) & Integer.MAX_VALUE;
+        return INDEX_UPDATER.getAndAdd(this, delta) & Integer.MAX_VALUE;
     }
 
     public final int addAndGet(int delta) {
         if (delta < 0) {
             throw new IllegalArgumentException("delta " + delta + " < 0");
         }
-        return indexUpdater.addAndGet(this, delta) & Integer.MAX_VALUE;
+        return INDEX_UPDATER.addAndGet(this, delta) & Integer.MAX_VALUE;
     }
 
     public final boolean compareAndSet(int expect, int update) {
         if (update < 0) {
             throw new IllegalArgumentException("update value " + update + " < 
0");
         }
-        return indexUpdater.compareAndSet(this, expect, update);
+        return INDEX_UPDATER.compareAndSet(this, expect, update);
     }
 
     public final boolean weakCompareAndSet(int expect, int update) {
         if (update < 0) {
             throw new IllegalArgumentException("update value " + update + " < 
0");
         }
-        return indexUpdater.weakCompareAndSet(this, expect, update);
+        return INDEX_UPDATER.weakCompareAndSet(this, expect, update);
     }
 
     @Override
diff --git 
a/dubbo-common/src/main/java/org/apache/dubbo/common/utils/ExecutorUtil.java 
b/dubbo-common/src/main/java/org/apache/dubbo/common/utils/ExecutorUtil.java
index 14408da..c342ed2 100644
--- a/dubbo-common/src/main/java/org/apache/dubbo/common/utils/ExecutorUtil.java
+++ b/dubbo-common/src/main/java/org/apache/dubbo/common/utils/ExecutorUtil.java
@@ -30,7 +30,7 @@ import java.util.concurrent.ScheduledFuture;
 
 public class ExecutorUtil {
     private static final Logger logger = 
LoggerFactory.getLogger(ExecutorUtil.class);
-    private static final ThreadPoolExecutor shutdownExecutor = new 
ThreadPoolExecutor(0, 1,
+    private static final ThreadPoolExecutor SHUTDOWN_EXECUTOR = new 
ThreadPoolExecutor(0, 1,
             0L, TimeUnit.MILLISECONDS,
             new LinkedBlockingQueue<Runnable>(100),
             new NamedThreadFactory("Close-ExecutorService-Timer", true));
@@ -102,7 +102,7 @@ public class ExecutorUtil {
 
     private static void newThreadToCloseExecutor(final ExecutorService es) {
         if (!isTerminated(es)) {
-            shutdownExecutor.execute(new Runnable() {
+            SHUTDOWN_EXECUTOR.execute(new Runnable() {
                 @Override
                 public void run() {
                     try {
diff --git 
a/dubbo-common/src/main/java/org/apache/dubbo/common/utils/NetUtils.java 
b/dubbo-common/src/main/java/org/apache/dubbo/common/utils/NetUtils.java
index f03d91a..3119e5c 100644
--- a/dubbo-common/src/main/java/org/apache/dubbo/common/utils/NetUtils.java
+++ b/dubbo-common/src/main/java/org/apache/dubbo/common/utils/NetUtils.java
@@ -55,7 +55,7 @@ public class NetUtils {
     private static final Pattern LOCAL_IP_PATTERN = 
Pattern.compile("127(\\.\\d{1,3}){3}$");
     private static final Pattern IP_PATTERN = 
Pattern.compile("\\d{1,3}(\\.\\d{1,3}){3,5}$");
 
-    private static final Map<String, String> hostNameCache = new 
LRUCache<>(1000);
+    private static final Map<String, String> HOST_NAME_CACHE = new 
LRUCache<>(1000);
     private static volatile InetAddress LOCAL_ADDRESS = null;
 
     private static final String SPLIT_IPV4_CHARECTER = "\\.";
@@ -291,14 +291,14 @@ public class NetUtils {
             if (i > -1) {
                 address = address.substring(0, i);
             }
-            String hostname = hostNameCache.get(address);
+            String hostname = HOST_NAME_CACHE.get(address);
             if (hostname != null && hostname.length() > 0) {
                 return hostname;
             }
             InetAddress inetAddress = InetAddress.getByName(address);
             if (inetAddress != null) {
                 hostname = inetAddress.getHostName();
-                hostNameCache.put(address, hostname);
+                HOST_NAME_CACHE.put(address, hostname);
                 return hostname;
             }
         } catch (Throwable e) {
diff --git 
a/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/AbstractConfig.java
 
b/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/AbstractConfig.java
index 30b3f50..50fb55e 100644
--- 
a/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/AbstractConfig.java
+++ 
b/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/AbstractConfig.java
@@ -95,7 +95,7 @@ public abstract class AbstractConfig implements Serializable {
     /**
      * The legacy properties container
      */
-    private static final Map<String, String> legacyProperties = new 
HashMap<String, String>();
+    private static final Map<String, String> LEGACY_PROPERTIES = new 
HashMap<String, String>();
 
     /**
      * The suffix container
@@ -103,14 +103,14 @@ public abstract class AbstractConfig implements 
Serializable {
     private static final String[] SUFFIXES = new String[]{"Config", "Bean"};
 
     static {
-        legacyProperties.put("dubbo.protocol.name", "dubbo.service.protocol");
-        legacyProperties.put("dubbo.protocol.host", 
"dubbo.service.server.host");
-        legacyProperties.put("dubbo.protocol.port", 
"dubbo.service.server.port");
-        legacyProperties.put("dubbo.protocol.threads", 
"dubbo.service.max.thread.pool.size");
-        legacyProperties.put("dubbo.consumer.timeout", 
"dubbo.service.invoke.timeout");
-        legacyProperties.put("dubbo.consumer.retries", 
"dubbo.service.max.retry.providers");
-        legacyProperties.put("dubbo.consumer.check", 
"dubbo.service.allow.no.provider");
-        legacyProperties.put("dubbo.service.url", "dubbo.service.address");
+        LEGACY_PROPERTIES.put("dubbo.protocol.name", "dubbo.service.protocol");
+        LEGACY_PROPERTIES.put("dubbo.protocol.host", 
"dubbo.service.server.host");
+        LEGACY_PROPERTIES.put("dubbo.protocol.port", 
"dubbo.service.server.port");
+        LEGACY_PROPERTIES.put("dubbo.protocol.threads", 
"dubbo.service.max.thread.pool.size");
+        LEGACY_PROPERTIES.put("dubbo.consumer.timeout", 
"dubbo.service.invoke.timeout");
+        LEGACY_PROPERTIES.put("dubbo.consumer.retries", 
"dubbo.service.max.retry.providers");
+        LEGACY_PROPERTIES.put("dubbo.consumer.check", 
"dubbo.service.allow.no.provider");
+        LEGACY_PROPERTIES.put("dubbo.service.url", "dubbo.service.address");
 
         // this is only for compatibility
         DubboShutdownHook.getDubboShutdownHook().register();
diff --git 
a/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/DubboShutdownHook.java
 
b/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/DubboShutdownHook.java
index 22d50dd..47c035e 100644
--- 
a/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/DubboShutdownHook.java
+++ 
b/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/DubboShutdownHook.java
@@ -34,7 +34,7 @@ public class DubboShutdownHook extends Thread {
 
     private static final Logger logger = 
LoggerFactory.getLogger(DubboShutdownHook.class);
 
-    private static final DubboShutdownHook dubboShutdownHook = new 
DubboShutdownHook("DubboShutdownHook");
+    private static final DubboShutdownHook DUBBO_SHUTDOWN_HOOK = new 
DubboShutdownHook("DubboShutdownHook");
     /**
      * Has it already been registered or not?
      */
@@ -49,7 +49,7 @@ public class DubboShutdownHook extends Thread {
     }
 
     public static DubboShutdownHook getDubboShutdownHook() {
-        return dubboShutdownHook;
+        return DUBBO_SHUTDOWN_HOOK;
     }
 
     @Override
diff --git 
a/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ReferenceConfig.java
 
b/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ReferenceConfig.java
index e1df319..4c37937 100644
--- 
a/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ReferenceConfig.java
+++ 
b/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ReferenceConfig.java
@@ -80,19 +80,19 @@ public class ReferenceConfig<T> extends 
AbstractReferenceConfig {
      * Actually,when the {@link ExtensionLoader} init the {@link Protocol} 
instants,it will automatically wraps two
      * layers, and eventually will get a <b>ProtocolFilterWrapper</b> or 
<b>ProtocolListenerWrapper</b>
      */
-    private static final Protocol refprotocol = 
ExtensionLoader.getExtensionLoader(Protocol.class).getAdaptiveExtension();
+    private static final Protocol REF_PROTOCOL = 
ExtensionLoader.getExtensionLoader(Protocol.class).getAdaptiveExtension();
 
     /**
      * The {@link Cluster}'s implementation with adaptive functionality, and 
actually it will get a {@link Cluster}'s
      * specific implementation who is wrapped with <b>MockClusterInvoker</b>
      */
-    private static final Cluster cluster = 
ExtensionLoader.getExtensionLoader(Cluster.class).getAdaptiveExtension();
+    private static final Cluster CLUSTER = 
ExtensionLoader.getExtensionLoader(Cluster.class).getAdaptiveExtension();
 
     /**
      * A {@link ProxyFactory} implementation that will generate a reference 
service's proxy,the JavassistProxyFactory is
      * its default implementation
      */
-    private static final ProxyFactory proxyFactory = 
ExtensionLoader.getExtensionLoader(ProxyFactory.class).getAdaptiveExtension();
+    private static final ProxyFactory PROXY_FACTORY = 
ExtensionLoader.getExtensionLoader(ProxyFactory.class).getAdaptiveExtension();
 
     /**
      * The url of the reference service
@@ -333,7 +333,7 @@ public class ReferenceConfig<T> extends 
AbstractReferenceConfig {
     private T createProxy(Map<String, String> map) {
         if (shouldJvmRefer(map)) {
             URL url = new URL(Constants.LOCAL_PROTOCOL, 
Constants.LOCALHOST_VALUE, 0, interfaceClass.getName()).addParameters(map);
-            invoker = refprotocol.refer(interfaceClass, url);
+            invoker = REF_PROTOCOL.refer(interfaceClass, url);
             if (logger.isInfoEnabled()) {
                 logger.info("Using injvm service " + interfaceClass.getName());
             }
@@ -371,23 +371,23 @@ public class ReferenceConfig<T> extends 
AbstractReferenceConfig {
             }
 
             if (urls.size() == 1) {
-                invoker = refprotocol.refer(interfaceClass, urls.get(0));
+                invoker = REF_PROTOCOL.refer(interfaceClass, urls.get(0));
             } else {
                 List<Invoker<?>> invokers = new ArrayList<Invoker<?>>();
                 URL registryURL = null;
                 for (URL url : urls) {
-                    invokers.add(refprotocol.refer(interfaceClass, url));
+                    invokers.add(REF_PROTOCOL.refer(interfaceClass, url));
                     if (Constants.REGISTRY_PROTOCOL.equals(url.getProtocol())) 
{
                         registryURL = url; // use last registry url
                     }
                 }
                 if (registryURL != null) { // registry url is available
-                    // use RegistryAwareCluster only when register's cluster 
is available
+                    // use RegistryAwareCluster only when register's CLUSTER 
is available
                     URL u = registryURL.addParameter(Constants.CLUSTER_KEY, 
RegistryAwareCluster.NAME);
                     // The invoker wrap relation would be: 
RegistryAwareClusterInvoker(StaticDirectory) -> 
FailoverClusterInvoker(RegistryDirectory, will execute route) -> Invoker
-                    invoker = cluster.join(new StaticDirectory(u, invokers));
+                    invoker = CLUSTER.join(new StaticDirectory(u, invokers));
                 } else { // not a registry url, must be direct invoke.
-                    invoker = cluster.join(new StaticDirectory(invokers));
+                    invoker = CLUSTER.join(new StaticDirectory(invokers));
                 }
             }
         }
@@ -410,7 +410,7 @@ public class ReferenceConfig<T> extends 
AbstractReferenceConfig {
             metadataReportService.publishConsumer(consumerURL);
         }
         // create service proxy
-        return (T) proxyFactory.getProxy(invoker);
+        return (T) PROXY_FACTORY.getProxy(invoker);
     }
 
     /**
diff --git 
a/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/context/ConfigManager.java
 
b/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/context/ConfigManager.java
index ae16ef9..808fd9c 100644
--- 
a/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/context/ConfigManager.java
+++ 
b/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/context/ConfigManager.java
@@ -73,7 +73,7 @@ import static org.apache.dubbo.common.Constants.DEFAULT_KEY;
  */
 public class ConfigManager {
     private static final Logger logger = 
LoggerFactory.getLogger(ConfigManager.class);
-    private static final ConfigManager configManager = new ConfigManager();
+    private static final ConfigManager CONFIG_MANAGER = new ConfigManager();
 
     private ApplicationConfig application;
     private MonitorConfig monitor;
@@ -86,7 +86,7 @@ public class ConfigManager {
     private Map<String, ConsumerConfig> consumers = new ConcurrentHashMap<>();
 
     public static ConfigManager getInstance() {
-        return configManager;
+        return CONFIG_MANAGER;
     }
 
     private ConfigManager() {
diff --git 
a/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/utils/ReferenceConfigCache.java
 
b/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/utils/ReferenceConfigCache.java
index 09f12da..0891a76 100644
--- 
a/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/utils/ReferenceConfigCache.java
+++ 
b/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/utils/ReferenceConfigCache.java
@@ -59,7 +59,7 @@ public class ReferenceConfigCache {
         }
         return ret.toString();
     };
-    static final ConcurrentMap<String, ReferenceConfigCache> cacheHolder = new 
ConcurrentHashMap<String, ReferenceConfigCache>();
+    static final ConcurrentMap<String, ReferenceConfigCache> CACHE_HOLDER = 
new ConcurrentHashMap<String, ReferenceConfigCache>();
     private final String name;
     private final KeyGenerator generator;
     ConcurrentMap<String, ReferenceConfig<?>> cache = new 
ConcurrentHashMap<String, ReferenceConfig<?>>();
@@ -90,12 +90,12 @@ public class ReferenceConfigCache {
      * Create cache if not existed yet.
      */
     public static ReferenceConfigCache getCache(String name, KeyGenerator 
keyGenerator) {
-        ReferenceConfigCache cache = cacheHolder.get(name);
+        ReferenceConfigCache cache = CACHE_HOLDER.get(name);
         if (cache != null) {
             return cache;
         }
-        cacheHolder.putIfAbsent(name, new ReferenceConfigCache(name, 
keyGenerator));
-        return cacheHolder.get(name);
+        CACHE_HOLDER.putIfAbsent(name, new ReferenceConfigCache(name, 
keyGenerator));
+        return CACHE_HOLDER.get(name);
     }
 
     @SuppressWarnings("unchecked")
diff --git 
a/dubbo-config/dubbo-config-api/src/test/java/org/apache/dubbo/config/utils/ReferenceConfigCacheTest.java
 
b/dubbo-config/dubbo-config-api/src/test/java/org/apache/dubbo/config/utils/ReferenceConfigCacheTest.java
index 2af6da7..656d2af 100644
--- 
a/dubbo-config/dubbo-config-api/src/test/java/org/apache/dubbo/config/utils/ReferenceConfigCacheTest.java
+++ 
b/dubbo-config/dubbo-config-api/src/test/java/org/apache/dubbo/config/utils/ReferenceConfigCacheTest.java
@@ -27,7 +27,7 @@ public class ReferenceConfigCacheTest {
     @BeforeEach
     public void setUp() throws Exception {
         MockReferenceConfig.setCounter(0);
-        ReferenceConfigCache.cacheHolder.clear();
+        ReferenceConfigCache.CACHE_HOLDER.clear();
     }
 
     @Test
diff --git 
a/dubbo-config/dubbo-config-spring/src/main/java/org/apache/dubbo/config/spring/extension/SpringExtensionFactory.java
 
b/dubbo-config/dubbo-config-spring/src/main/java/org/apache/dubbo/config/spring/extension/SpringExtensionFactory.java
index 6aa80e8..d61db85 100644
--- 
a/dubbo-config/dubbo-config-spring/src/main/java/org/apache/dubbo/config/spring/extension/SpringExtensionFactory.java
+++ 
b/dubbo-config/dubbo-config-spring/src/main/java/org/apache/dubbo/config/spring/extension/SpringExtensionFactory.java
@@ -40,29 +40,29 @@ import java.util.Set;
 public class SpringExtensionFactory implements ExtensionFactory {
     private static final Logger logger = 
LoggerFactory.getLogger(SpringExtensionFactory.class);
 
-    private static final Set<ApplicationContext> contexts = new 
ConcurrentHashSet<ApplicationContext>();
-    private static final ApplicationListener shutdownHookListener = new 
ShutdownHookListener();
+    private static final Set<ApplicationContext> CONTEXTS = new 
ConcurrentHashSet<ApplicationContext>();
+    private static final ApplicationListener SHUTDOWN_HOOK_LISTENER = new 
ShutdownHookListener();
 
     public static void addApplicationContext(ApplicationContext context) {
-        contexts.add(context);
+        CONTEXTS.add(context);
         if (context instanceof ConfigurableApplicationContext) {
             ((ConfigurableApplicationContext) context).registerShutdownHook();
             DubboShutdownHook.getDubboShutdownHook().unregister();
         }
-        BeanFactoryUtils.addApplicationListener(context, shutdownHookListener);
+        BeanFactoryUtils.addApplicationListener(context, 
SHUTDOWN_HOOK_LISTENER);
     }
 
     public static void removeApplicationContext(ApplicationContext context) {
-        contexts.remove(context);
+        CONTEXTS.remove(context);
     }
 
     public static Set<ApplicationContext> getContexts() {
-        return contexts;
+        return CONTEXTS;
     }
 
     // currently for test purpose
     public static void clearContexts() {
-        contexts.clear();
+        CONTEXTS.clear();
     }
 
     @Override
@@ -74,7 +74,7 @@ public class SpringExtensionFactory implements 
ExtensionFactory {
             return null;
         }
 
-        for (ApplicationContext context : contexts) {
+        for (ApplicationContext context : CONTEXTS) {
             if (context.containsBean(name)) {
                 Object bean = context.getBean(name);
                 if (type.isInstance(bean)) {
@@ -89,7 +89,7 @@ public class SpringExtensionFactory implements 
ExtensionFactory {
             return null;
         }
 
-        for (ApplicationContext context : contexts) {
+        for (ApplicationContext context : CONTEXTS) {
             try {
                 return context.getBean(type);
             } catch (NoUniqueBeanDefinitionException multiBeanExe) {
diff --git 
a/dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/integration/RegistryDirectory.java
 
b/dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/integration/RegistryDirectory.java
index 2593b2e..54bb006 100644
--- 
a/dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/integration/RegistryDirectory.java
+++ 
b/dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/integration/RegistryDirectory.java
@@ -75,9 +75,9 @@ public class RegistryDirectory<T> extends 
AbstractDirectory<T> implements Notify
 
     private static final Logger logger = 
LoggerFactory.getLogger(RegistryDirectory.class);
 
-    private static final Cluster cluster = 
ExtensionLoader.getExtensionLoader(Cluster.class).getAdaptiveExtension();
+    private static final Cluster CLUSTER = 
ExtensionLoader.getExtensionLoader(Cluster.class).getAdaptiveExtension();
 
-    private static final RouterFactory routerFactory = 
ExtensionLoader.getExtensionLoader(RouterFactory.class)
+    private static final RouterFactory ROUTER_FACTORY = 
ExtensionLoader.getExtensionLoader(RouterFactory.class)
             .getAdaptiveExtension();
 
     private final String serviceKey; // Initialization at construction time, 
assertion not null
@@ -108,7 +108,7 @@ public class RegistryDirectory<T> extends 
AbstractDirectory<T> implements Notify
     // Set<invokerUrls> cache invokeUrls to invokers mapping.
     private volatile Set<URL> cachedInvokerUrls; // The initial value is null 
and the midway may be assigned to null, please use the local variable reference
 
-    private static final ConsumerConfigurationListener 
consumerConfigurationListener = new ConsumerConfigurationListener();
+    private static final ConsumerConfigurationListener 
CONSUMER_CONFIGURATION_LISTENER = new ConsumerConfigurationListener();
     private ReferenceConfigurationListener serviceConfigurationListener;
 
 
@@ -152,7 +152,7 @@ public class RegistryDirectory<T> extends 
AbstractDirectory<T> implements Notify
 
     public void subscribe(URL url) {
         setConsumerUrl(url);
-        consumerConfigurationListener.addNotifyListener(this);
+        CONSUMER_CONFIGURATION_LISTENER.addNotifyListener(this);
         serviceConfigurationListener = new 
ReferenceConfigurationListener(this, url);
         registry.subscribe(url, this);
     }
@@ -178,7 +178,7 @@ public class RegistryDirectory<T> extends 
AbstractDirectory<T> implements Notify
                 registry.unsubscribe(getConsumerUrl(), this);
             }
             DynamicConfiguration.getDynamicConfiguration()
-                    .removeListener(ApplicationModel.getApplication(), 
consumerConfigurationListener);
+                    .removeListener(ApplicationModel.getApplication(), 
CONSUMER_CONFIGURATION_LISTENER);
         } catch (Throwable t) {
             logger.warn("unexpected error when unsubscribe service " + 
serviceKey + "from registry" + registry.getUrl(), t);
         }
@@ -308,7 +308,7 @@ public class RegistryDirectory<T> extends 
AbstractDirectory<T> implements Notify
             for (List<Invoker<T>> groupList : groupMap.values()) {
                 StaticDirectory<T> staticDirectory = new 
StaticDirectory<>(groupList);
                 staticDirectory.buildRouterChain();
-                mergedInvokers.add(cluster.join(staticDirectory));
+                mergedInvokers.add(CLUSTER.join(staticDirectory));
             }
         } else {
             mergedInvokers = invokers;
@@ -336,7 +336,7 @@ public class RegistryDirectory<T> extends 
AbstractDirectory<T> implements Notify
                 url = url.setProtocol(routerType);
             }
             try {
-                Router router = routerFactory.getRouter(url);
+                Router router = ROUTER_FACTORY.getRouter(url);
                 if (!routers.contains(router)) {
                     routers.add(router);
                 }
@@ -461,7 +461,7 @@ public class RegistryDirectory<T> extends 
AbstractDirectory<T> implements Notify
         providerUrl = overrideWithConfigurators(this.configurators, 
providerUrl);
 
         // override url with configurator from configurator from 
"app-name.configurators"
-        providerUrl = 
overrideWithConfigurators(consumerConfigurationListener.getConfigurators(), 
providerUrl);
+        providerUrl = 
overrideWithConfigurators(CONSUMER_CONFIGURATION_LISTENER.getConfigurators(), 
providerUrl);
 
         // override url with configurator from configurators from 
"service-name.configurators"
         if (serviceConfigurationListener != null) {
@@ -655,7 +655,7 @@ public class RegistryDirectory<T> extends 
AbstractDirectory<T> implements Notify
         this.overrideDirectoryUrl = directoryUrl;
         List<Configurator> localConfigurators = this.configurators; // local 
reference
         doOverrideUrl(localConfigurators);
-        List<Configurator> localAppDynamicConfigurators = 
consumerConfigurationListener.getConfigurators(); // local reference
+        List<Configurator> localAppDynamicConfigurators = 
CONSUMER_CONFIGURATION_LISTENER.getConfigurators(); // local reference
         doOverrideUrl(localAppDynamicConfigurators);
         if (serviceConfigurationListener != null) {
             List<Configurator> localDynamicConfigurators = 
serviceConfigurationListener.getConfigurators(); // local reference
diff --git 
a/dubbo-remoting/dubbo-remoting-http/src/main/java/org/apache/dubbo/remoting/http/servlet/ServletManager.java
 
b/dubbo-remoting/dubbo-remoting-http/src/main/java/org/apache/dubbo/remoting/http/servlet/ServletManager.java
index 0b22770..243c554 100644
--- 
a/dubbo-remoting/dubbo-remoting-http/src/main/java/org/apache/dubbo/remoting/http/servlet/ServletManager.java
+++ 
b/dubbo-remoting/dubbo-remoting-http/src/main/java/org/apache/dubbo/remoting/http/servlet/ServletManager.java
@@ -28,12 +28,12 @@ public class ServletManager {
 
     public static final int EXTERNAL_SERVER_PORT = -1234;
 
-    private static final ServletManager instance = new ServletManager();
+    private static final ServletManager INSTANCE = new ServletManager();
 
     private final Map<Integer, ServletContext> contextMap = new 
ConcurrentHashMap<Integer, ServletContext>();
 
     public static ServletManager getInstance() {
-        return instance;
+        return INSTANCE;
     }
 
     public void addServletContext(int port, ServletContext servletContext) {
diff --git 
a/dubbo-remoting/dubbo-remoting-mina/src/main/java/org/apache/dubbo/remoting/transport/mina/MinaClient.java
 
b/dubbo-remoting/dubbo-remoting-mina/src/main/java/org/apache/dubbo/remoting/transport/mina/MinaClient.java
index 23296f7..b5e9c84 100644
--- 
a/dubbo-remoting/dubbo-remoting-mina/src/main/java/org/apache/dubbo/remoting/transport/mina/MinaClient.java
+++ 
b/dubbo-remoting/dubbo-remoting-mina/src/main/java/org/apache/dubbo/remoting/transport/mina/MinaClient.java
@@ -51,7 +51,7 @@ public class MinaClient extends AbstractClient {
 
     private static final Logger logger = 
LoggerFactory.getLogger(MinaClient.class);
 
-    private static final Map<String, SocketConnector> connectors = new 
ConcurrentHashMap<String, SocketConnector>();
+    private static final Map<String, SocketConnector> CONNECTORS = new 
ConcurrentHashMap<String, SocketConnector>();
 
     private String connectorKey;
 
@@ -66,7 +66,7 @@ public class MinaClient extends AbstractClient {
     @Override
     protected void doOpen() throws Throwable {
         connectorKey = getUrl().toFullString();
-        SocketConnector c = connectors.get(connectorKey);
+        SocketConnector c = CONNECTORS.get(connectorKey);
         if (c != null) {
             connector = c;
         } else {
@@ -82,7 +82,7 @@ public class MinaClient extends AbstractClient {
             cfg.setConnectTimeout(timeout < 1000 ? 1 : timeout / 1000);
             // set codec.
             connector.getFilterChain().addLast("codec", new 
ProtocolCodecFilter(new MinaCodecAdapter(getCodec(), getUrl(), this)));
-            connectors.put(connectorKey, connector);
+            CONNECTORS.put(connectorKey, connector);
         }
     }
 
diff --git 
a/dubbo-remoting/dubbo-remoting-netty/src/main/java/org/apache/dubbo/remoting/transport/netty/NettyChannel.java
 
b/dubbo-remoting/dubbo-remoting-netty/src/main/java/org/apache/dubbo/remoting/transport/netty/NettyChannel.java
index 9a0e107..f5e0213 100644
--- 
a/dubbo-remoting/dubbo-remoting-netty/src/main/java/org/apache/dubbo/remoting/transport/netty/NettyChannel.java
+++ 
b/dubbo-remoting/dubbo-remoting-netty/src/main/java/org/apache/dubbo/remoting/transport/netty/NettyChannel.java
@@ -38,7 +38,7 @@ final class NettyChannel extends AbstractChannel {
 
     private static final Logger logger = 
LoggerFactory.getLogger(NettyChannel.class);
 
-    private static final ConcurrentMap<org.jboss.netty.channel.Channel, 
NettyChannel> channelMap = new 
ConcurrentHashMap<org.jboss.netty.channel.Channel, NettyChannel>();
+    private static final ConcurrentMap<org.jboss.netty.channel.Channel, 
NettyChannel> CHANNEL_MAP = new 
ConcurrentHashMap<org.jboss.netty.channel.Channel, NettyChannel>();
 
     private final org.jboss.netty.channel.Channel channel;
 
@@ -56,11 +56,11 @@ final class NettyChannel extends AbstractChannel {
         if (ch == null) {
             return null;
         }
-        NettyChannel ret = channelMap.get(ch);
+        NettyChannel ret = CHANNEL_MAP.get(ch);
         if (ret == null) {
             NettyChannel nc = new NettyChannel(ch, url, handler);
             if (ch.isConnected()) {
-                ret = channelMap.putIfAbsent(ch, nc);
+                ret = CHANNEL_MAP.putIfAbsent(ch, nc);
             }
             if (ret == null) {
                 ret = nc;
@@ -71,7 +71,7 @@ final class NettyChannel extends AbstractChannel {
 
     static void removeChannelIfDisconnected(org.jboss.netty.channel.Channel 
ch) {
         if (ch != null && !ch.isConnected()) {
-            channelMap.remove(ch);
+            CHANNEL_MAP.remove(ch);
         }
     }
 
diff --git 
a/dubbo-remoting/dubbo-remoting-netty/src/main/java/org/apache/dubbo/remoting/transport/netty/NettyClient.java
 
b/dubbo-remoting/dubbo-remoting-netty/src/main/java/org/apache/dubbo/remoting/transport/netty/NettyClient.java
index 434fd2a..e991298 100644
--- 
a/dubbo-remoting/dubbo-remoting-netty/src/main/java/org/apache/dubbo/remoting/transport/netty/NettyClient.java
+++ 
b/dubbo-remoting/dubbo-remoting-netty/src/main/java/org/apache/dubbo/remoting/transport/netty/NettyClient.java
@@ -48,7 +48,7 @@ public class NettyClient extends AbstractClient {
 
     // ChannelFactory's closure has a DirectMemory leak, using static to avoid
     // https://issues.jboss.org/browse/NETTY-424
-    private static final ChannelFactory channelFactory = new 
NioClientSocketChannelFactory(Executors.newCachedThreadPool(new 
NamedThreadFactory("NettyClientBoss", true)),
+    private static final ChannelFactory CHANNEL_FACTORY = new 
NioClientSocketChannelFactory(Executors.newCachedThreadPool(new 
NamedThreadFactory("NettyClientBoss", true)),
             Executors.newCachedThreadPool(new 
NamedThreadFactory("NettyClientWorker", true)),
             Constants.DEFAULT_IO_THREADS);
     private ClientBootstrap bootstrap;
@@ -62,7 +62,7 @@ public class NettyClient extends AbstractClient {
     @Override
     protected void doOpen() throws Throwable {
         NettyHelper.setNettyLoggerFactory();
-        bootstrap = new ClientBootstrap(channelFactory);
+        bootstrap = new ClientBootstrap(CHANNEL_FACTORY);
         // config
         // @see org.jboss.netty.channel.socket.SocketChannelConfig
         bootstrap.setOption("keepAlive", true);
diff --git 
a/dubbo-remoting/dubbo-remoting-netty4/src/main/java/org/apache/dubbo/remoting/transport/netty4/NettyChannel.java
 
b/dubbo-remoting/dubbo-remoting-netty4/src/main/java/org/apache/dubbo/remoting/transport/netty4/NettyChannel.java
index db69a29..21bf241 100644
--- 
a/dubbo-remoting/dubbo-remoting-netty4/src/main/java/org/apache/dubbo/remoting/transport/netty4/NettyChannel.java
+++ 
b/dubbo-remoting/dubbo-remoting-netty4/src/main/java/org/apache/dubbo/remoting/transport/netty4/NettyChannel.java
@@ -39,7 +39,7 @@ final class NettyChannel extends AbstractChannel {
 
     private static final Logger logger = 
LoggerFactory.getLogger(NettyChannel.class);
 
-    private static final ConcurrentMap<Channel, NettyChannel> channelMap = new 
ConcurrentHashMap<Channel, NettyChannel>();
+    private static final ConcurrentMap<Channel, NettyChannel> CHANNEL_MAP = 
new ConcurrentHashMap<Channel, NettyChannel>();
 
     private final Channel channel;
 
@@ -57,11 +57,11 @@ final class NettyChannel extends AbstractChannel {
         if (ch == null) {
             return null;
         }
-        NettyChannel ret = channelMap.get(ch);
+        NettyChannel ret = CHANNEL_MAP.get(ch);
         if (ret == null) {
             NettyChannel nettyChannel = new NettyChannel(ch, url, handler);
             if (ch.isActive()) {
-                ret = channelMap.putIfAbsent(ch, nettyChannel);
+                ret = CHANNEL_MAP.putIfAbsent(ch, nettyChannel);
             }
             if (ret == null) {
                 ret = nettyChannel;
@@ -72,7 +72,7 @@ final class NettyChannel extends AbstractChannel {
 
     static void removeChannelIfDisconnected(Channel ch) {
         if (ch != null && !ch.isActive()) {
-            channelMap.remove(ch);
+            CHANNEL_MAP.remove(ch);
         }
     }
 
diff --git 
a/dubbo-remoting/dubbo-remoting-zookeeper/src/main/java/org/apache/dubbo/remoting/zookeeper/curator/CuratorZookeeperClient.java
 
b/dubbo-remoting/dubbo-remoting-zookeeper/src/main/java/org/apache/dubbo/remoting/zookeeper/curator/CuratorZookeeperClient.java
index 4bf7b6d..a97eb7e 100644
--- 
a/dubbo-remoting/dubbo-remoting-zookeeper/src/main/java/org/apache/dubbo/remoting/zookeeper/curator/CuratorZookeeperClient.java
+++ 
b/dubbo-remoting/dubbo-remoting-zookeeper/src/main/java/org/apache/dubbo/remoting/zookeeper/curator/CuratorZookeeperClient.java
@@ -48,7 +48,7 @@ import java.util.concurrent.Executor;
 
 public class CuratorZookeeperClient extends 
AbstractZookeeperClient<CuratorZookeeperClient.CuratorWatcherImpl, 
CuratorZookeeperClient.CuratorWatcherImpl> {
 
-    static final Charset charset = Charset.forName("UTF-8");
+    static final Charset CHARSET = Charset.forName("UTF-8");
     private final CuratorFramework client;
     private Map<String, TreeCache> treeCacheMap = new ConcurrentHashMap<>();
 
@@ -106,7 +106,7 @@ public class CuratorZookeeperClient extends 
AbstractZookeeperClient<CuratorZooke
 
     @Override
     protected void createPersistent(String path, String data) {
-        byte[] dataBytes = data.getBytes(charset);
+        byte[] dataBytes = data.getBytes(CHARSET);
         try {
             client.create().forPath(path, dataBytes);
         } catch (NodeExistsException e) {
@@ -122,7 +122,7 @@ public class CuratorZookeeperClient extends 
AbstractZookeeperClient<CuratorZooke
 
     @Override
     protected void createEphemeral(String path, String data) {
-        byte[] dataBytes = data.getBytes(charset);
+        byte[] dataBytes = data.getBytes(CHARSET);
         try {
             client.create().withMode(CreateMode.EPHEMERAL).forPath(path, 
dataBytes);
         } catch (NodeExistsException e) {
@@ -177,7 +177,7 @@ public class CuratorZookeeperClient extends 
AbstractZookeeperClient<CuratorZooke
     public String doGetContent(String path) {
         try {
             byte[] dataBytes = client.getData().forPath(path);
-            return (dataBytes == null || dataBytes.length == 0) ? null : new 
String(dataBytes, charset);
+            return (dataBytes == null || dataBytes.length == 0) ? null : new 
String(dataBytes, CHARSET);
         } catch (NoNodeException e) {
             // ignore NoNode Exception.
         } catch (Exception e) {
@@ -295,12 +295,12 @@ public class CuratorZookeeperClient extends 
AbstractZookeeperClient<CuratorZooke
                     case NODE_ADDED:
                         eventType = EventType.NodeCreated;
                         path = event.getData().getPath();
-                        content = new String(event.getData().getData(), 
charset);
+                        content = new String(event.getData().getData(), 
CHARSET);
                         break;
                     case NODE_UPDATED:
                         eventType = EventType.NodeDataChanged;
                         path = event.getData().getPath();
-                        content = new String(event.getData().getData(), 
charset);
+                        content = new String(event.getData().getData(), 
CHARSET);
                         break;
                     case NODE_REMOVED:
                         path = event.getData().getPath();
diff --git 
a/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/filter/AccessLogFilter.java
 
b/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/filter/AccessLogFilter.java
index f1bffc2..23fa1ea 100644
--- 
a/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/filter/AccessLogFilter.java
+++ 
b/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/filter/AccessLogFilter.java
@@ -75,16 +75,16 @@ public class AccessLogFilter implements Filter {
     // It's safe to declare it as singleton since it runs on single thread only
     private static final DateFormat FILE_NAME_FORMATTER = new 
SimpleDateFormat(FILE_DATE_FORMAT);
 
-    private static final Map<String, Set<AccessLogData>> logEntries = new 
ConcurrentHashMap<String, Set<AccessLogData>>();
+    private static final Map<String, Set<AccessLogData>> LOG_ENTRIES = new 
ConcurrentHashMap<String, Set<AccessLogData>>();
 
-    private static final ScheduledExecutorService logScheduled = 
Executors.newSingleThreadScheduledExecutor(new 
NamedThreadFactory("Dubbo-Access-Log", true));
+    private static final ScheduledExecutorService LOG_SCHEDULED = 
Executors.newSingleThreadScheduledExecutor(new 
NamedThreadFactory("Dubbo-Access-Log", true));
 
     /**
      * Default constructor initialize demon thread for writing into access log 
file with names with access log key
      * defined in url <b>accesslog</b>
      */
     public AccessLogFilter() {
-        logScheduled.scheduleWithFixedDelay(this::writeLogToFile, 
LOG_OUTPUT_INTERVAL, LOG_OUTPUT_INTERVAL, TimeUnit.MILLISECONDS);
+        LOG_SCHEDULED.scheduleWithFixedDelay(this::writeLogToFile, 
LOG_OUTPUT_INTERVAL, LOG_OUTPUT_INTERVAL, TimeUnit.MILLISECONDS);
     }
 
     /**
@@ -110,7 +110,7 @@ public class AccessLogFilter implements Filter {
     }
 
     private void log(String accessLog, AccessLogData accessLogData) {
-        Set<AccessLogData> logSet = logEntries.computeIfAbsent(accessLog, k -> 
new ConcurrentHashSet<>());
+        Set<AccessLogData> logSet = LOG_ENTRIES.computeIfAbsent(accessLog, k 
-> new ConcurrentHashSet<>());
 
         if (logSet.size() < LOG_MAX_BUFFER) {
             logSet.add(accessLogData);
@@ -121,8 +121,8 @@ public class AccessLogFilter implements Filter {
     }
 
     private void writeLogToFile() {
-        if (!logEntries.isEmpty()) {
-            for (Map.Entry<String, Set<AccessLogData>> entry : 
logEntries.entrySet()) {
+        if (!LOG_ENTRIES.isEmpty()) {
+            for (Map.Entry<String, Set<AccessLogData>> entry : 
LOG_ENTRIES.entrySet()) {
                 try {
                     String accessLog = entry.getKey();
                     Set<AccessLogData> logSet = entry.getValue();
diff --git 
a/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/model/ApplicationModel.java
 
b/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/model/ApplicationModel.java
index cfad21c..33dcc90 100644
--- 
a/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/model/ApplicationModel.java
+++ 
b/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/model/ApplicationModel.java
@@ -39,38 +39,38 @@ public class ApplicationModel {
     /**
      * full qualified class name -> provided service
      */
-    private static final ConcurrentMap<String, ProviderModel> providedServices 
= new ConcurrentHashMap<>();
+    private static final ConcurrentMap<String, ProviderModel> 
PROVIDED_SERVICES = new ConcurrentHashMap<>();
     /**
      * full qualified class name -> subscribe service
      */
-    private static final ConcurrentMap<String, ConsumerModel> consumedServices 
= new ConcurrentHashMap<>();
+    private static final ConcurrentMap<String, ConsumerModel> 
CONSUMED_SERVICES = new ConcurrentHashMap<>();
 
     private static String application;
 
     public static Collection<ConsumerModel> allConsumerModels() {
-        return consumedServices.values();
+        return CONSUMED_SERVICES.values();
     }
 
     public static Collection<ProviderModel> allProviderModels() {
-        return providedServices.values();
+        return PROVIDED_SERVICES.values();
     }
 
     public static ProviderModel getProviderModel(String serviceName) {
-        return providedServices.get(serviceName);
+        return PROVIDED_SERVICES.get(serviceName);
     }
 
     public static ConsumerModel getConsumerModel(String serviceName) {
-        return consumedServices.get(serviceName);
+        return CONSUMED_SERVICES.get(serviceName);
     }
 
     public static void initConsumerModel(String serviceName, ConsumerModel 
consumerModel) {
-        if (consumedServices.putIfAbsent(serviceName, consumerModel) != null) {
+        if (CONSUMED_SERVICES.putIfAbsent(serviceName, consumerModel) != null) 
{
             LOGGER.warn("Already register the same consumer:" + serviceName);
         }
     }
 
     public static void initProviderModel(String serviceName, ProviderModel 
providerModel) {
-        if (providedServices.putIfAbsent(serviceName, providerModel) != null) {
+        if (PROVIDED_SERVICES.putIfAbsent(serviceName, providerModel) != null) 
{
             LOGGER.warn("Already register the same:" + serviceName);
         }
     }
@@ -87,7 +87,7 @@ public class ApplicationModel {
      * For unit test
      */
     public static void reset() {
-        providedServices.clear();
-        consumedServices.clear();
+        PROVIDED_SERVICES.clear();
+        CONSUMED_SERVICES.clear();
     }
 }
diff --git 
a/dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/CallbackServiceCodec.java
 
b/dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/CallbackServiceCodec.java
index 4d2f3c6..5eb4dd9 100644
--- 
a/dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/CallbackServiceCodec.java
+++ 
b/dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/CallbackServiceCodec.java
@@ -43,7 +43,7 @@ import java.util.Set;
 class CallbackServiceCodec {
     private static final Logger logger = 
LoggerFactory.getLogger(CallbackServiceCodec.class);
 
-    private static final ProxyFactory proxyFactory = 
ExtensionLoader.getExtensionLoader(ProxyFactory.class).getAdaptiveExtension();
+    private static final ProxyFactory PROXY_FACTORY = 
ExtensionLoader.getExtensionLoader(ProxyFactory.class).getAdaptiveExtension();
     private static final DubboProtocol protocol = 
DubboProtocol.getDubboProtocol();
     private static final byte CALLBACK_NONE = 0x0;
     private static final byte CALLBACK_CREATE = 0x1;
@@ -105,7 +105,7 @@ class CallbackServiceCodec {
             // one channel can have multiple callback instances, no need to 
re-export for different instance.
             if (!channel.hasAttribute(cacheKey)) {
                 if (!isInstancesOverLimit(channel, url, clazz.getName(), 
instid, false)) {
-                    Invoker<?> invoker = proxyFactory.getInvoker(inst, clazz, 
exportUrl);
+                    Invoker<?> invoker = PROXY_FACTORY.getInvoker(inst, clazz, 
exportUrl);
                     // should destroy resource?
                     Exporter<?> exporter = protocol.export(invoker);
                     // this is used for tracing if instid has published 
service or not.
@@ -144,7 +144,7 @@ class CallbackServiceCodec {
                 if (!isInstancesOverLimit(channel, referurl, clazz.getName(), 
instid, true)) {
                     @SuppressWarnings("rawtypes")
                     Invoker<?> invoker = new ChannelWrappedInvoker(clazz, 
channel, referurl, String.valueOf(instid));
-                    proxy = proxyFactory.getProxy(invoker);
+                    proxy = PROXY_FACTORY.getProxy(invoker);
                     channel.setAttribute(proxyCacheKey, proxy);
                     channel.setAttribute(invokerCacheKey, invoker);
                     increaseInstanceCount(channel, countkey);
diff --git 
a/dubbo-rpc/dubbo-rpc-http/src/main/java/org/apache/dubbo/rpc/protocol/http/HttpRemoteInvocation.java
 
b/dubbo-rpc/dubbo-rpc-http/src/main/java/org/apache/dubbo/rpc/protocol/http/HttpRemoteInvocation.java
index c2cf48a..b461739 100644
--- 
a/dubbo-rpc/dubbo-rpc-http/src/main/java/org/apache/dubbo/rpc/protocol/http/HttpRemoteInvocation.java
+++ 
b/dubbo-rpc/dubbo-rpc-http/src/main/java/org/apache/dubbo/rpc/protocol/http/HttpRemoteInvocation.java
@@ -31,18 +31,18 @@ import java.util.Map;
 public class HttpRemoteInvocation extends RemoteInvocation {
 
     private static final long serialVersionUID = 1L;
-    private static final String dubboAttachmentsAttrName = "dubbo.attachments";
+    private static final String DUBBO_ATTACHMENTS_ATTR_NAME = 
"dubbo.attachments";
 
     public HttpRemoteInvocation(MethodInvocation methodInvocation) {
         super(methodInvocation);
-        addAttribute(dubboAttachmentsAttrName, new HashMap<String, 
String>(RpcContext.getContext().getAttachments()));
+        addAttribute(DUBBO_ATTACHMENTS_ATTR_NAME, new HashMap<String, 
String>(RpcContext.getContext().getAttachments()));
     }
 
     @Override
     public Object invoke(Object targetObject) throws NoSuchMethodException, 
IllegalAccessException,
             InvocationTargetException {
         RpcContext context = RpcContext.getContext();
-        context.setAttachments((Map<String, String>) 
getAttribute(dubboAttachmentsAttrName));
+        context.setAttachments((Map<String, String>) 
getAttribute(DUBBO_ATTACHMENTS_ATTR_NAME));
 
         String generic = (String) getAttribute(Constants.GENERIC_KEY);
         if (StringUtils.isNotEmpty(generic)) {
diff --git 
a/dubbo-rpc/dubbo-rpc-thrift/src/main/java/org/apache/dubbo/rpc/protocol/thrift/ThriftCodec.java
 
b/dubbo-rpc/dubbo-rpc-thrift/src/main/java/org/apache/dubbo/rpc/protocol/thrift/ThriftCodec.java
index 564505a..b40996c 100644
--- 
a/dubbo-rpc/dubbo-rpc-thrift/src/main/java/org/apache/dubbo/rpc/protocol/thrift/ThriftCodec.java
+++ 
b/dubbo-rpc/dubbo-rpc-thrift/src/main/java/org/apache/dubbo/rpc/protocol/thrift/ThriftCodec.java
@@ -84,10 +84,10 @@ public class ThriftCodec implements Codec2 {
     public static final String PARAMETER_CLASS_NAME_GENERATOR = 
"class.name.generator";
     public static final byte VERSION = (byte) 1;
     public static final short MAGIC = (short) 0xdabc;
-    static final ConcurrentMap<Long, RequestData> cachedRequest =
+    static final ConcurrentMap<Long, RequestData> CACHED_REQUEST =
             new ConcurrentHashMap<Long, RequestData>();
     private static final AtomicInteger THRIFT_SEQ_ID = new AtomicInteger(0);
-    private static final ConcurrentMap<String, Class<?>> cachedClass =
+    private static final ConcurrentMap<String, Class<?>> CACHED_CLASS =
             new ConcurrentHashMap<String, Class<?>>();
 
     private static int nextSeqId() {
@@ -193,14 +193,14 @@ public class ThriftCodec implements Codec2 {
                         "The specified interface name incorrect.");
             }
 
-            Class clazz = cachedClass.get(argsClassName);
+            Class clazz = CACHED_CLASS.get(argsClassName);
 
             if (clazz == null) {
                 try {
 
                     clazz = 
ClassUtils.forNameWithThreadContextClassLoader(argsClassName);
 
-                    cachedClass.putIfAbsent(argsClassName, clazz);
+                    CACHED_CLASS.putIfAbsent(argsClassName, clazz);
 
                 } catch (ClassNotFoundException e) {
                     throw new 
RpcException(RpcException.SERIALIZATION_EXCEPTION, e.getMessage(), e);
@@ -268,7 +268,7 @@ public class ThriftCodec implements Codec2 {
             Request request = new Request(id);
             request.setData(result);
 
-            cachedRequest.putIfAbsent(id,
+            CACHED_REQUEST.putIfAbsent(id,
                     RequestData.create(message.seqid, serviceName, 
message.name));
 
             return request;
@@ -306,7 +306,7 @@ public class ThriftCodec implements Codec2 {
                         + serviceName + ", the service name you specified may 
not generated by thrift idl compiler");
             }
 
-            Class<?> clazz = cachedClass.get(resultClassName);
+            Class<?> clazz = CACHED_CLASS.get(resultClassName);
 
             if (clazz == null) {
 
@@ -314,7 +314,7 @@ public class ThriftCodec implements Codec2 {
 
                     clazz = 
ClassUtils.forNameWithThreadContextClassLoader(resultClassName);
 
-                    cachedClass.putIfAbsent(resultClassName, clazz);
+                    CACHED_CLASS.putIfAbsent(resultClassName, clazz);
 
                 } catch (ClassNotFoundException e) {
                     throw new 
RpcException(RpcException.SERIALIZATION_EXCEPTION, e.getMessage(), e);
@@ -422,7 +422,7 @@ public class ThriftCodec implements Codec2 {
                     "Could not encode request, the specified interface may be 
incorrect.");
         }
 
-        Class<?> clazz = cachedClass.get(methodArgs);
+        Class<?> clazz = CACHED_CLASS.get(methodArgs);
 
         if (clazz == null) {
 
@@ -430,7 +430,7 @@ public class ThriftCodec implements Codec2 {
 
                 clazz = 
ClassUtils.forNameWithThreadContextClassLoader(methodArgs);
 
-                cachedClass.putIfAbsent(methodArgs, clazz);
+                CACHED_CLASS.putIfAbsent(methodArgs, clazz);
 
             } catch (ClassNotFoundException e) {
                 throw new RpcException(RpcException.SERIALIZATION_EXCEPTION, 
e.getMessage(), e);
@@ -538,7 +538,7 @@ public class ThriftCodec implements Codec2 {
 
         RpcResult result = (RpcResult) response.getResult();
 
-        RequestData rd = cachedRequest.get(response.getId());
+        RequestData rd = CACHED_REQUEST.get(response.getId());
 
         String resultClassName = 
ExtensionLoader.getExtensionLoader(ClassNameGenerator.class).getExtension(
                 
channel.getUrl().getParameter(ThriftConstants.CLASS_NAME_GENERATOR_KEY, 
ThriftClassNameGenerator.NAME))
@@ -549,13 +549,13 @@ public class ThriftCodec implements Codec2 {
                     "Could not encode response, the specified interface may be 
incorrect.");
         }
 
-        Class clazz = cachedClass.get(resultClassName);
+        Class clazz = CACHED_CLASS.get(resultClassName);
 
         if (clazz == null) {
 
             try {
                 clazz = 
ClassUtils.forNameWithThreadContextClassLoader(resultClassName);
-                cachedClass.putIfAbsent(resultClassName, clazz);
+                CACHED_CLASS.putIfAbsent(resultClassName, clazz);
             } catch (ClassNotFoundException e) {
                 throw new RpcException(RpcException.SERIALIZATION_EXCEPTION, 
e.getMessage(), e);
             }
diff --git 
a/dubbo-rpc/dubbo-rpc-thrift/src/main/java/org/apache/dubbo/rpc/protocol/thrift/ThriftType.java
 
b/dubbo-rpc/dubbo-rpc-thrift/src/main/java/org/apache/dubbo/rpc/protocol/thrift/ThriftType.java
index 3d8d3b3..85ede89 100644
--- 
a/dubbo-rpc/dubbo-rpc-thrift/src/main/java/org/apache/dubbo/rpc/protocol/thrift/ThriftType.java
+++ 
b/dubbo-rpc/dubbo-rpc-thrift/src/main/java/org/apache/dubbo/rpc/protocol/thrift/ThriftType.java
@@ -26,7 +26,7 @@ public enum ThriftType {
 
     BOOL, BYTE, I16, I32, I64, DOUBLE, STRING;
 
-    private static final Map<Class<?>, ThriftType> types =
+    private static final Map<Class<?>, ThriftType> TYPES =
             new HashMap<Class<?>, ThriftType>();
 
     static {
@@ -39,13 +39,13 @@ public enum ThriftType {
 
     public static ThriftType get(Class<?> key) {
         if (key != null) {
-            return types.get(key);
+            return TYPES.get(key);
         }
         throw new NullPointerException("key == null");
     }
 
     private static void put(Class<?> key, ThriftType value) {
-        types.put(key, value);
+        TYPES.put(key, value);
     }
 
 }
diff --git 
a/dubbo-rpc/dubbo-rpc-thrift/src/test/java/org/apache/dubbo/rpc/protocol/thrift/ThriftCodecTest.java
 
b/dubbo-rpc/dubbo-rpc-thrift/src/test/java/org/apache/dubbo/rpc/protocol/thrift/ThriftCodecTest.java
index c2277f7..2b0b1db 100644
--- 
a/dubbo-rpc/dubbo-rpc-thrift/src/test/java/org/apache/dubbo/rpc/protocol/thrift/ThriftCodecTest.java
+++ 
b/dubbo-rpc/dubbo-rpc-thrift/src/test/java/org/apache/dubbo/rpc/protocol/thrift/ThriftCodecTest.java
@@ -286,7 +286,7 @@ public class ThriftCodecTest {
 
         ThriftCodec.RequestData rd = ThriftCodec.RequestData.create(
                 ThriftCodec.getSeqId(), Demo.Iface.class.getName(), 
"echoString");
-        ThriftCodec.cachedRequest.putIfAbsent(request.getId(), rd);
+        ThriftCodec.CACHED_REQUEST.putIfAbsent(request.getId(), rd);
         codec.encode(channel, bos, response);
 
         byte[] buf = new byte[bos.writerIndex() - 4];
@@ -345,7 +345,7 @@ public class ThriftCodecTest {
 
         ThriftCodec.RequestData rd = ThriftCodec.RequestData.create(
                 ThriftCodec.getSeqId(), Demo.Iface.class.getName(), 
"echoString");
-        ThriftCodec.cachedRequest.put(request.getId(), rd);
+        ThriftCodec.CACHED_REQUEST.put(request.getId(), rd);
         codec.encode(channel, bos, response);
 
         byte[] buf = new byte[bos.writerIndex() - 4];
diff --git 
a/dubbo-serialization/dubbo-serialization-api/src/main/java/org/apache/dubbo/common/serialize/support/SerializableClassRegistry.java
 
b/dubbo-serialization/dubbo-serialization-api/src/main/java/org/apache/dubbo/common/serialize/support/SerializableClassRegistry.java
index 22de45d..1a8fb69 100644
--- 
a/dubbo-serialization/dubbo-serialization-api/src/main/java/org/apache/dubbo/common/serialize/support/SerializableClassRegistry.java
+++ 
b/dubbo-serialization/dubbo-serialization-api/src/main/java/org/apache/dubbo/common/serialize/support/SerializableClassRegistry.java
@@ -28,7 +28,7 @@ import java.util.Map;
 public abstract class SerializableClassRegistry {
 
 
-    private static final Map<Class, Object> registrations = new 
LinkedHashMap<>();
+    private static final Map<Class, Object> REGISTRATIONS = new 
LinkedHashMap<>();
 
     /**
      * only supposed to be called at startup time
@@ -49,7 +49,7 @@ public abstract class SerializableClassRegistry {
         if (clazz == null) {
             throw new IllegalArgumentException("Class registered to kryo 
cannot be null!");
         }
-        registrations.put(clazz, serializer);
+        REGISTRATIONS.put(clazz, serializer);
     }
 
     /**
@@ -58,6 +58,6 @@ public abstract class SerializableClassRegistry {
      * @return class serializer
      * */
     public static Map<Class, Object> getRegisteredClasses() {
-        return registrations;
+        return REGISTRATIONS;
     }
 }

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