聊聊skywalking的spring-annotation-plugin

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_FIELD_METHOD = "setSkyWalkingDynamicField";
​
    @Override public final ConstructorInterceptPoint[] getConstructorsInterceptPoints() {
        return new ConstructorInterceptPoint[0];
    }
​
    @Override public final InstanceMethodsInterceptPoint[] getInstanceMethodsInterceptPoints() {
        return new InstanceMethodsInterceptPoint[] {
            new DeclaredInstanceMethodsInterceptPoint() {
                @Override public ElementMatcher<MethodDescription> getMethodsMatcher() {
                    return isPublic().and(not(isDeclaredBy(Object.class)).and(not(named(INTERCEPT_GET_SKYWALKING_DYNAMIC_FIELD_METHOD))).and(not(named(INTERCEPT_SET_SKYWALKING_DYNAMIC_FIELD_METHOD))));
                }
​
                @Override public String getMethodsInterceptor() {
                    return INTERCEPTOR_CLASS;
                }
​
                @Override public boolean isOverrideArgs() {
                    return false;
                }
            }
        };
    }
}

public class SpringBeanInstrumentation extends AbstractSpringBeanInstrumentation {
​
    public static final String ENHANCE_ANNOTATION = "org.springframework.context.annotation.Bean";
​
    @Override protected ClassMatch enhanceClass() {
        return byClassAnnotationMatch(new String[] {ENHANCE_ANNOTATION});
    }
}

public class SpringServicesInstrumentation extends AbstractSpringBeanInstrumentation {
​
    public static final String ENHANCE_ANNOTATION = "org.springframework.stereotype.Service";
​
    @Override protected ClassMatch enhanceClass() {
        return byClassAnnotationMatch(new String[] {ENHANCE_ANNOTATION});
    }
}

public class SpringComponentInstrumentation extends AbstractSpringBeanInstrumentation {
​
    public static final String ENHANCE_ANNOTATION = "org.springframework.stereotype.Component";
​
    @Override protected ClassMatch enhanceClass() {
        return byClassAnnotationMatch(new String[] {ENHANCE_ANNOTATION});
    }
}

public class SpringRepositoryInstrumentation extends AbstractSpringBeanInstrumentation {
​
    public static final String ENHANCE_ANNOTATION = "org.springframework.stereotype.Repository";
​
    @Override protected ClassMatch enhanceClass() {
        return byClassAnnotationMatch(new String[] {ENHANCE_ANNOTATION});
    }
}

public class SpringAnnotationInterceptor implements InstanceMethodsAroundInterceptor {
    @Override
    public void beforeMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class<?>[] argumentsTypes,
        MethodInterceptResult result) throws Throwable {
        String operationName = objInst.getClass().getName() + "." + method.getName();
        ContextManager.createLocalSpan(operationName);
    }
​
    @Override
    public Object afterMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class<?>[] argumentsTypes,
        Object ret) throws Throwable {
        ContextManager.stopSpan();
        return ret;
    }
​
    @Override public void handleMethodException(EnhancedInstance objInst, Method method, Object[] allArguments,
        Class<?>[] argumentsTypes, Throwable t) {
        ContextManager.activeSpan().errorOccurred().log(t);
    }
}