refactory code

apm-sniffer/optional-plugins/optional-spring-plugins/spring-annotation-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/annotations/AbstractSpringBeanInstrumentation.java

@@ -31,6 +31,8 @@ import static net.bytebuddy.matcher.ElementMatchers.not;
 
 public abstract class AbstractSpringBeanInstrumentation extends ClassInstanceMethodsEnhancePluginDefine {
     private static final String INTERCEPTOR_CLASS = "org.apache.skywalking.apm.plugin.spring.annotations.SpringAnnotationInterceptor";
+    public static final String INTERCEPT_GET_SKYWALKING_DYNAMIC_FIELD_METHOD = "getSkyWalkingDynamicField";
+    public static final String INTERCEPT_SET_SKYWALKING_DYNAMIC_FEILD_METHOD = "setSkyWalkingDynamicField";
 
     @Override protected final ConstructorInterceptPoint[] getConstructorsInterceptPoints() {
         return new ConstructorInterceptPoint[0];
@@ -40,7 +42,7 @@ public abstract class AbstractSpringBeanInstrumentation extends ClassInstanceMet
         return new InstanceMethodsInterceptPoint[] {
             new InstanceMethodsInterceptPoint() {
                 @Override public ElementMatcher<MethodDescription> getMethodsMatcher() {
-                    return isPublic().and(not(isDeclaredBy(Object.class)).and(not(named("getSkyWalkingDynamicField"))).and(not(named("setSkyWalkingDynamicField"))));
+                    return isPublic().and(not(isDeclaredBy(Object.class)).and(not(named(INTERCEPT_GET_SKYWALKING_DYNAMIC_FIELD_METHOD))).and(not(named(INTERCEPT_SET_SKYWALKING_DYNAMIC_FEILD_METHOD))));
                 }
 
                 @Override public String getMethodsInterceptor() {

apm-sniffer/optional-plugins/optional-spring-plugins/spring-annotation-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/annotations/bean/SpringBeanInstrumentation.java

@@ -28,7 +28,9 @@ import static org.apache.skywalking.apm.agent.core.plugin.match.ClassAnnotationM
  */
 public class SpringBeanInstrumentation extends AbstractSpringBeanInstrumentation {
 
+    public static final String ENHANCE_ANNOTATION = "org.springframework.context.annotation.Bean";
+
     @Override protected ClassMatch enhanceClass() {
-        return byClassAnnotationMatch(new String[] {"org.springframework.context.annotation.Bean"});
+        return byClassAnnotationMatch(new String[] {ENHANCE_ANNOTATION});
     }
 }

apm-sniffer/optional-plugins/optional-spring-plugins/spring-annotation-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/annotations/component/SpringComponentInstrumentation.java

@@ -25,7 +25,9 @@ import static org.apache.skywalking.apm.agent.core.plugin.match.ClassAnnotationM
 
 public class SpringComponentInstrumentation extends AbstractSpringBeanInstrumentation {
 
+    public static final String ENHANCE_ANNOTATION = "org.springframework.stereotype.Component";
+
     @Override protected ClassMatch enhanceClass() {
-        return byClassAnnotationMatch(new String[] {"org.springframework.stereotype.Component"});
+        return byClassAnnotationMatch(new String[] {ENHANCE_ANNOTATION});
     }
 }

apm-sniffer/optional-plugins/optional-spring-plugins/spring-annotation-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/annotations/repository/SpringRepositoryInstrumentation.java

@@ -24,7 +24,10 @@ import org.apache.skywalking.apm.plugin.spring.annotations.AbstractSpringBeanIns
 import static org.apache.skywalking.apm.agent.core.plugin.match.ClassAnnotationMatch.byClassAnnotationMatch;
 
 public class SpringRepositoryInstrumentation extends AbstractSpringBeanInstrumentation {
+
+    public static final String ENHANCE_ANNOTATION = "org.springframework.stereotype.Repository";
+
     @Override protected ClassMatch enhanceClass() {
-        return byClassAnnotationMatch(new String[] {"org.springframework.stereotype.Repository"});
+        return byClassAnnotationMatch(new String[] {ENHANCE_ANNOTATION});
     }
 }

apm-sniffer/optional-plugins/optional-spring-plugins/spring-annotation-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/annotations/services/SpringServicesInstrumentation.java

@@ -25,7 +25,9 @@ import static org.apache.skywalking.apm.agent.core.plugin.match.ClassAnnotationM
 
 public class SpringServicesInstrumentation extends AbstractSpringBeanInstrumentation {
 
+    public static final String ENHANCE_ANNOTATION = "org.springframework.stereotype.Service";
+
     @Override protected ClassMatch enhanceClass() {
-        return byClassAnnotationMatch(new String[] {"org.springframework.stereotype.Service"});
+        return byClassAnnotationMatch(new String[] {ENHANCE_ANNOTATION});
     }
 }