Spring循环依赖测试，日志解析。

其他 2018-09-22 13:01:57 阅读次数: 0
版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/Bof_jangle/article/details/82629698

此处定义A B两个接口，并进行互相依赖。

A

package xyz.jangle.service;

public interface A {
	
	void testA();

}

AImpl

package xyz.jangle.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import xyz.jangle.service.A;
import xyz.jangle.service.B;

@Service
public class AImpl implements A {
	
	@Autowired
	private B b;

	@Override
	public void testA() {
		System.out.println("aaa");
		b.testB();
	}
	

}

B

package xyz.jangle.service;

public interface B {
	
	void testB();

}

BImpl

package xyz.jangle.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import xyz.jangle.service.A;
import xyz.jangle.service.B;

@Service
public class BImpl implements B {
	@Autowired
	private A a;

	@Override
	public void testB() {
		System.out.println("bbb");
//		a.testA();
	}
	
	

}

启动日志：

  2018-09-11 13:46:05  [ localhost-startStop-1:2227 ] - [ DEBUG ]  Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@162e29a: defining beans [AImpl,BImpl,userServiceImpl,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,executeIntercept,org.springframework.aop.config.internalAutoProxyCreator,dataSource,sqlSessionFactory,org.mybatis.spring.mapper.MapperScannerConfigurer#0,txManager,org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0,org.springframework.transaction.interceptor.TransactionInterceptor#0,org.springframework.transaction.config.internalTransactionAdvisor,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor,org.springframework.context.annotation.ConfigurationClassPostProcessor.enhancedConfigurationProcessor,userMapper]; root of factory hierarchy
  2018-09-11 13:46:05  [ localhost-startStop-1:2228 ] - [ DEBUG ]  Creating shared instance of singleton bean 'AImpl'
  2018-09-11 13:46:05  [ localhost-startStop-1:2228 ] - [ DEBUG ]  Creating instance of bean 'AImpl'
  2018-09-11 13:46:05  [ localhost-startStop-1:2230 ] - [ DEBUG ]  Creating shared instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor'
  2018-09-11 13:46:05  [ localhost-startStop-1:2230 ] - [ DEBUG ]  Creating instance of bean 'org.springframework.transaction.config.internalTransactionAdvisor'
  2018-09-11 13:46:05  [ localhost-startStop-1:2232 ] - [ DEBUG ]  Eagerly caching bean 'org.springframework.transaction.config.internalTransactionAdvisor' to allow for resolving potential circular references
  2018-09-11 13:46:05  [ localhost-startStop-1:2244 ] - [ DEBUG ]  Creating shared instance of singleton bean 'org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0'
  2018-09-11 13:46:05  [ localhost-startStop-1:2245 ] - [ DEBUG ]  Creating instance of bean 'org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0'
  2018-09-11 13:46:05  [ localhost-startStop-1:2245 ] - [ DEBUG ]  Skipping currently created advisor 'org.springframework.transaction.config.internalTransactionAdvisor'
  2018-09-11 13:46:05  [ localhost-startStop-1:2274 ] - [ DEBUG ]  Found AspectJ method: public java.lang.Object xyz.jangle.aop.ExecuteIntercept.aroundExecute(org.aspectj.lang.ProceedingJoinPoint)
  2018-09-11 13:46:05  [ localhost-startStop-1:2276 ] - [ DEBUG ]  Found AspectJ method: public void xyz.jangle.aop.ExecuteIntercept.beforeExecute()
  2018-09-11 13:46:05  [ localhost-startStop-1:2277 ] - [ DEBUG ]  Found AspectJ method: public void xyz.jangle.aop.ExecuteIntercept.afterExecute()
  2018-09-11 13:46:05  [ localhost-startStop-1:2277 ] - [ DEBUG ]  Found AspectJ method: public void xyz.jangle.aop.ExecuteIntercept.afterReturnExecute()
  2018-09-11 13:46:05  [ localhost-startStop-1:2285 ] - [ DEBUG ]  Eagerly caching bean 'org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0' to allow for resolving potential circular references
  2018-09-11 13:46:05  [ localhost-startStop-1:2291 ] - [ DEBUG ]  Skipping currently created advisor 'org.springframework.transaction.config.internalTransactionAdvisor'
  2018-09-11 13:46:05  [ localhost-startStop-1:2292 ] - [ DEBUG ]  Skipping currently created advisor 'org.springframework.transaction.config.internalTransactionAdvisor'
  2018-09-11 13:46:05  [ localhost-startStop-1:2490 ] - [ DEBUG ]  Finished creating instance of bean 'org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0'
  2018-09-11 13:46:05  [ localhost-startStop-1:2491 ] - [ DEBUG ]  Finished creating instance of bean 'org.springframework.transaction.config.internalTransactionAdvisor'
  2018-09-11 13:46:05  [ localhost-startStop-1:2495 ] - [ DEBUG ]  Registered injected element on class [xyz.jangle.service.impl.AImpl]: AutowiredFieldElement for private xyz.jangle.service.B xyz.jangle.service.impl.AImpl.b
  2018-09-11 13:46:05  [ localhost-startStop-1:2495 ] - [ DEBUG ]  Eagerly caching bean 'AImpl' to allow for resolving potential circular references
  2018-09-11 13:46:05  [ localhost-startStop-1:2499 ] - [ DEBUG ]  Processing injected method of bean 'AImpl': AutowiredFieldElement for private xyz.jangle.service.B xyz.jangle.service.impl.AImpl.b
  2018-09-11 13:46:05  [ localhost-startStop-1:2501 ] - [ DEBUG ]  Returning cached instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor'
  2018-09-11 13:46:05  [ localhost-startStop-1:2502 ] - [ DEBUG ]  Creating shared instance of singleton bean 'userMapper'
  2018-09-11 13:46:05  [ localhost-startStop-1:2502 ] - [ DEBUG ]  Creating instance of bean 'userMapper'
  2018-09-11 13:46:05  [ localhost-startStop-1:2503 ] - [ DEBUG ]  Eagerly caching bean 'userMapper' to allow for resolving potential circular references
  2018-09-11 13:46:05  [ localhost-startStop-1:2521 ] - [ DEBUG ]  Invoking afterPropertiesSet() on bean with name 'userMapper'
  2018-09-11 13:46:05  [ localhost-startStop-1:2521 ] - [ DEBUG ]  Returning cached instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor'
  2018-09-11 13:46:05  [ localhost-startStop-1:2522 ] - [ DEBUG ]  Returning cached instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor'
  2018-09-11 13:46:05  [ localhost-startStop-1:2532 ] - [ DEBUG ]  Finished creating instance of bean 'userMapper'
  2018-09-11 13:46:05  [ localhost-startStop-1:2533 ] - [ DEBUG ]  Creating shared instance of singleton bean 'BImpl'
  2018-09-11 13:46:05  [ localhost-startStop-1:2533 ] - [ DEBUG ]  Creating instance of bean 'BImpl'
  2018-09-11 13:46:05  [ localhost-startStop-1:2533 ] - [ DEBUG ]  Returning cached instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor'
  2018-09-11 13:46:05  [ localhost-startStop-1:2535 ] - [ DEBUG ]  Registered injected element on class [xyz.jangle.service.impl.BImpl]: AutowiredFieldElement for private xyz.jangle.service.A xyz.jangle.service.impl.BImpl.a
  2018-09-11 13:46:05  [ localhost-startStop-1:2535 ] - [ DEBUG ]  Eagerly caching bean 'BImpl' to allow for resolving potential circular references
  2018-09-11 13:46:05  [ localhost-startStop-1:2538 ] - [ DEBUG ]  Processing injected method of bean 'BImpl': AutowiredFieldElement for private xyz.jangle.service.A xyz.jangle.service.impl.BImpl.a
  2018-09-11 13:46:05  [ localhost-startStop-1:2538 ] - [ DEBUG ]  Returning cached instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor'
  2018-09-11 13:46:05  [ localhost-startStop-1:2538 ] - [ DEBUG ]  Returning cached instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor'
  2018-09-11 13:46:05  [ localhost-startStop-1:2551 ] - [ DEBUG ]  Creating implicit proxy for bean 'AImpl' with 0 common interceptors and 5 specific interceptors
  2018-09-11 13:46:06  [ localhost-startStop-1:2553 ] - [ DEBUG ]  Creating JDK dynamic proxy: target source is SingletonTargetSource for target object [xyz.jangle.service.impl.AImpl@6b5912f2]
  2018-09-11 13:46:06  [ localhost-startStop-1:2557 ] - [ DEBUG ]  Returning eagerly cached instance of singleton bean 'AImpl' that is not fully initialized yet - a consequence of a circular reference
  2018-09-11 13:46:06  [ localhost-startStop-1:2557 ] - [ DEBUG ]  Autowiring by type from bean name 'BImpl' to bean named 'AImpl'
  2018-09-11 13:46:06  [ localhost-startStop-1:2558 ] - [ DEBUG ]  Returning cached instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor'
  2018-09-11 13:46:06  [ localhost-startStop-1:2558 ] - [ DEBUG ]  Returning cached instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor'
  2018-09-11 13:46:06  [ localhost-startStop-1:2560 ] - [ DEBUG ]  Creating implicit proxy for bean 'BImpl' with 0 common interceptors and 5 specific interceptors
  2018-09-11 13:46:06  [ localhost-startStop-1:2561 ] - [ DEBUG ]  Creating JDK dynamic proxy: target source is SingletonTargetSource for target object [xyz.jangle.service.impl.BImpl@72389dee]
  2018-09-11 13:46:06  [ localhost-startStop-1:2562 ] - [ DEBUG ]  Finished creating instance of bean 'BImpl'
  2018-09-11 13:46:06  [ localhost-startStop-1:2562 ] - [ DEBUG ]  Autowiring by type from bean name 'AImpl' to bean named 'BImpl'
  2018-09-11 13:46:06  [ localhost-startStop-1:2563 ] - [ DEBUG ]  Finished creating instance of bean 'AImpl'
  2018-09-11 13:46:06  [ localhost-startStop-1:2563 ] - [ DEBUG ]  Returning cached instance of singleton bean 'BImpl'

行号：

1、告知所有的bean

2、开始创建AImpl对象

19、发现有属性(依赖)需要注入，即B对象。

20、缓存AImpl对象（以应对可能存在的循环依赖问题）

21、准备注入B依赖

30、开始创建BImpl（B的实现）

34、缓存BImpl对象（以应对可能存在的循环依赖问题）

35、发现有属性（依赖）需要注入，即A对象。（A对象未完全实例化，但对象存在，并进行了缓存，存在指向的地址。）

41、将AImpl（A的实现）注入BImpl对象。（虽然AImpl未完全实例化，但已经可以使用，不理解可以了解下对象创建过程

导读：https://www.cnblogs.com/chenyangyao/p/5296807.html 

虽然觉得这个写的不是很完美，但图文并茂已经很不错了。

）

46、完成BImpl对象的创建。

47、将BImpl（B的实现）注入AImpl对象。

48、完成AImpl对象的创建。

---   中间夹杂了一些内容的创建为AOP动态代理相关的内容（因为我写的切面对所有的service进行了干预）

创建action

package xyz.jangle.action;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

import xyz.jangle.model.User;
import xyz.jangle.service.A;
import xyz.jangle.service.UserService;

@Controller
@RequestMapping("/mvc")
public class Hello {
	// 养成一种习惯，将项目的控制层对象，对应的视图，视图所用的js文件，三个名称进行统一。用Ctrl+R查找时可以很方便地找到他们
	@Autowired
	private A a;
	
	@RequestMapping("/testAb")
	public ModelAndView testAB() {
		a.testA();
		return new ModelAndView("hello");
	}

}

测试http://127.0.0.1/mvc/testAb执行结果：

[DEBUG] 2018-09-11 18:02:15,296 method:org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:845)
DispatcherServlet with name 'springmvc' processing GET request for [/mvc/testAb]
  [DEBUG] 2018-09-11 18:02:15,301 method:org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:297)
Looking up handler method for path /mvc/testAb
  [DEBUG] 2018-09-11 18:02:15,305 method:org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:302)
Returning handler method [public org.springframework.web.servlet.ModelAndView xyz.jangle.action.Hello.testAB()]
  [DEBUG] 2018-09-11 18:02:15,305 method:org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:247)
Returning cached instance of singleton bean 'hello'
  [DEBUG] 2018-09-11 18:02:15,306 method:org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:931)
Last-Modified value for [/mvc/testAb] is: -1
  [DEBUG] 2018-09-11 18:02:15,326 method:org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:247)
Returning cached instance of singleton bean 'executeIntercept'
  around befroe
before execute to do something
aaa
around befroe
before execute to do something
bbb
around after
after execute to do something
afterReturning execute to do something
around after
after execute to do something
afterReturning execute to do something
[DEBUG] 2018-09-11 18:02:15,331 method:org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1610)
Invoking afterPropertiesSet() on bean with name 'hello'

猜你喜欢

转载自blog.csdn.net/Bof_jangle/article/details/82629698
今日推荐
TIOBE 5 月榜单：Fortran “复活”进入 Top 10
GCC 14.1 发布
面壁智能发布 Eurux-8x22B 开源大模型 —— 堪称「理科状元」
开源日报 | 谷歌扶持鸿蒙上位；开源Rabbit R1；Docker加持的安卓手机；微软的焦虑和野心；海尔电器把开放平台关了
中国码农的“35岁魔咒”
蘭雅 CorelDRAW 插件 2024.5.1 国际劳动节版，免费下载
Arc Browser for Windows 1.0 正式 GA
90后程序员开发视频搬运软件、不到一年获利超 700 万，结局很刑！
周排行
Java自定义时间格式
同步整形电路
在开发中最最最常用的字符串的属性大集合
Linux 查看端口占用并杀掉
Java基础四：ArrayList
多线程之死锁就是这么简单
mysql 基础命令集
awk 命令详解
Centos6.3编译安装nginx+php步骤
OCR （Optical Character Recognition，光学字符识别）
每日归档
更多
2024-05-08(42)
2024-05-07(14)
2024-05-06(40)
2024-05-05(0)
2024-05-04(7)
2024-05-03(19)
2024-05-02(0)
2024-05-01(4)
2024-04-30(1)
2024-04-29(40)

代码天地 © 2018 codetd.com

境外服务器   最新电视剧2022