Polish code in Dubbo adapter and use Dubbo common constants (#1245)

sentinel-adapter/sentinel-apache-dubbo-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/dubbo/DubboAppContextFilter.java

@@ -24,12 +24,14 @@ import org.apache.dubbo.rpc.Result;
 import org.apache.dubbo.rpc.RpcContext;
 import org.apache.dubbo.rpc.RpcException;
 
+import static org.apache.dubbo.common.constants.CommonConstants.CONSUMER;
+
 /**
  * Puts current consumer's application name in the attachment of each invocation.
  *
  * @author Eric Zhao
  */
-@Activate(group = "consumer")
+@Activate(group = CONSUMER)
 public class DubboAppContextFilter implements Filter {
 
     @Override

sentinel-adapter/sentinel-apache-dubbo-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/dubbo/SentinelDubboConsumerFilter.java

@@ -32,6 +32,8 @@ import org.apache.dubbo.rpc.RpcContext;
 import org.apache.dubbo.rpc.RpcException;
 import org.apache.dubbo.rpc.support.RpcUtils;
 
+import static org.apache.dubbo.common.constants.CommonConstants.CONSUMER;
+
 /**
  * <p>Dubbo service consumer filter for Sentinel. Auto activated by default.</p>
  * <p>
@@ -43,7 +45,7 @@ import org.apache.dubbo.rpc.support.RpcUtils;
  * @author Carpenter Lee
  * @author Eric Zhao
  */
-@Activate(group = "consumer")
+@Activate(group = CONSUMER)
 public class SentinelDubboConsumerFilter extends BaseSentinelDubboFilter {
 
     public SentinelDubboConsumerFilter() {

sentinel-adapter/sentinel-apache-dubbo-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/dubbo/SentinelDubboProviderFilter.java

@@ -31,6 +31,8 @@ import org.apache.dubbo.rpc.Result;
 import org.apache.dubbo.rpc.RpcContext;
 import org.apache.dubbo.rpc.RpcException;
 
+import static org.apache.dubbo.common.constants.CommonConstants.PROVIDER;
+
 /**
  * <p>Apache Dubbo service provider filter that enables integration with Sentinel. Auto activated by default.</p>
  * <p>Note: this only works for Apache Dubbo 2.7.x or above version.</p>
@@ -43,7 +45,7 @@ import org.apache.dubbo.rpc.RpcException;
  * @author Carpenter Lee
  * @author Eric Zhao
  */
-@Activate(group = "provider")
+@Activate(group = PROVIDER)
 public class SentinelDubboProviderFilter extends BaseSentinelDubboFilter {
 
     public SentinelDubboProviderFilter() {

sentinel-adapter/sentinel-dubbo-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/dubbo/DubboAppContextFilter.java

@@ -24,12 +24,14 @@ import com.alibaba.dubbo.rpc.Result;
 import com.alibaba.dubbo.rpc.RpcContext;
 import com.alibaba.dubbo.rpc.RpcException;
 
+import static com.alibaba.dubbo.common.Constants.CONSUMER;
+
 /**
  * Puts current consumer's application name in the attachment of each invocation.
  *
  * @author Eric Zhao
  */
-@Activate(group = "consumer")
+@Activate(group = CONSUMER)
 public class DubboAppContextFilter implements Filter {
 
     @Override

sentinel-adapter/sentinel-dubbo-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/dubbo/SentinelDubboConsumerFilter.java

@@ -31,6 +31,8 @@ import com.alibaba.dubbo.rpc.Invoker;
 import com.alibaba.dubbo.rpc.Result;
 import com.alibaba.dubbo.rpc.RpcException;
 
+import static com.alibaba.dubbo.common.Constants.CONSUMER;
+
 /**
  * <p>Dubbo service consumer filter for Sentinel. Auto activated by default.</p>
  *
@@ -42,7 +44,7 @@ import com.alibaba.dubbo.rpc.RpcException;
  * @author leyou
  * @author Eric Zhao
  */
-@Activate(group = "consumer")
+@Activate(group = CONSUMER)
 public class SentinelDubboConsumerFilter extends AbstractDubboFilter implements Filter {
 
     public SentinelDubboConsumerFilter() {

sentinel-adapter/sentinel-dubbo-adapter/src/main/java/com/alibaba/csp/sentinel/adapter/dubbo/SentinelDubboProviderFilter.java

@@ -32,6 +32,8 @@ import com.alibaba.dubbo.rpc.Invoker;
 import com.alibaba.dubbo.rpc.Result;
 import com.alibaba.dubbo.rpc.RpcException;
 
+import static com.alibaba.dubbo.common.Constants.PROVIDER;
+
 /**
  * <p>Dubbo service provider filter for Sentinel. Auto activated by default.</p>
  *
@@ -43,7 +45,7 @@ import com.alibaba.dubbo.rpc.RpcException;
  * @author leyou
  * @author Eric Zhao
  */
-@Activate(group = "provider")
+@Activate(group = PROVIDER)
 public class SentinelDubboProviderFilter extends AbstractDubboFilter implements Filter {
 
     public SentinelDubboProviderFilter() {