生产机器被锁怎么解除

其他 2020-03-18 22:54:00 阅读次数: 0

面向切面编程是一种编程范式，它作为OOP面向对象编程的一种补充，用于处理系统中分布于各个模块的横切关注点，比如事务管理、权限控制、缓存控制、日志打印等等。
AOP把软件的功能模块分为两个部分：核心关注点和横切关注点。业务处理的主要功能为核心关注点，而非核心、需要拓展的功能为横切关注点。AOP的作用在于分离系统中的各种关注点，将核心关注点和横切关注点进行分离，使用切面有以下好处：

集中处理某一关注点/横切逻辑
可以很方便的添加/删除关注点
侵入性少，增强代码可读性及可维护性
因此当想打印请求日志时很容易想到切面，对控制层代码0侵入

切面的使用【基于注解】

@Aspect => 声明该类为一个注解类

切点注解：

@Pointcut => 定义一个切点，可以简化代码

通知注解：

@Before => 在切点之前执行代码
@After => 在切点之后执行代码
@AfterReturning => 切点返回内容后执行代码，可以对切点的返回值进行封装
@AfterThrowing => 切点抛出异常后执行
@Around => 环绕，在切点前后执行代码

动手写一个请求日志切面

使用@Pointcut定义切点@Pointcut(“execution(* your_package.controller…*(…))”)
public void requestServer() {
}
复制代码@Pointcut定义了一个切点，因为是请求日志切边，因此切点定义的是Controller包下的所有类下的方法。定义切点以后在通知注解中直接使用requestServer方法名就可以了
使用@Before再切点前执行@Before(“requestServer()”)
public void doBefore(JoinPoint joinPoint) {
ServletRequestAttributes attributes = (ServletRequestAttributes)
RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();

LOGGER.info("===============================Start========================");
LOGGER.info("IP                 : {}", request.getRemoteAddr());
LOGGER.info("URL                : {}", request.getRequestURL().toString());
LOGGER.info("HTTP Method        : {}", request.getMethod());
LOGGER.info("Class Method       : {}.{}", joinPoint.getSignature().getDeclaringTypeName(), joinPoint.getSignature().getName());

}
复制代码在进入Controller方法前，打印出调用方IP、请求URL、HTTP请求类型、调用的方法名
使用@Around打印进入控制层的入参@Around(“requestServer()”)
public Object doAround(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
long start = System.currentTimeMillis();
Object result = proceedingJoinPoint.proceed();
LOGGER.info(“Request Params : {}”, getRequestParams(proceedingJoinPoint));
LOGGER.info(“Result : {}”, result);
LOGGER.info(“Time Cost : {} ms”, System.currentTimeMillis() - start);

return result;

}
复制代码打印了入参、结果以及耗时

getRquestParams方法private Map<String, Object> getRequestParams(ProceedingJoinPoint proceedingJoinPoint) {
Map<String, Object> requestParams = new HashMap<>();

  //参数名
 String[] paramNames = ((MethodSignature)proceedingJoinPoint.getSignature()).getParameterNames();
 //参数值
 Object[] paramValues = proceedingJoinPoint.getArgs();

 for (int i = 0; i < paramNames.length; i++) {
     Object value = paramValues[i];

     //如果是文件对象
     if (value instanceof MultipartFile) {
         MultipartFile file = (MultipartFile) value;
         value = file.getOriginalFilename();  //获取文件名
     }

     requestParams.put(paramNames[i], value);
 }

 return requestParams;

}
复制代码通过 @PathVariable以及@RequestParam注解传递的参数无法打印出参数名，因此需要手动拼接一下参数名，同时对文件对象进行了特殊处理，只需获取文件名即可

@After方法调用后执行@After(“requestServer()”)
public void doAfter(JoinPoint joinPoint) {
LOGGER.info("=======End");
}
复制代码

没有业务逻辑只是打印了End

完整切面代码@Component
@Aspect
public class RequestLogAspect {
private final static Logger LOGGER = LoggerFactory.getLogger(RequestLogAspect.class);

@Pointcut("execution(* your_package.controller..*(..))")
public void requestServer() {
}

@Before("requestServer()")
public void doBefore(JoinPoint joinPoint) {
    ServletRequestAttributes attributes = (ServletRequestAttributes)

RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();

    LOGGER.info("===============================Start========================");
    LOGGER.info("IP                 : {}", request.getRemoteAddr());
    LOGGER.info("URL                : {}", request.getRequestURL().toString());
    LOGGER.info("HTTP Method        : {}", request.getMethod());
    LOGGER.info("Class Method       : {}.{}", joinPoint.getSignature().getDeclaringTypeName(),

joinPoint.getSignature().getName());
}

@Around("requestServer()")
public Object doAround(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
    long start = System.currentTimeMillis();
    Object result = proceedingJoinPoint.proceed();
    LOGGER.info("Request Params     : {}", getRequestParams(proceedingJoinPoint));
    LOGGER.info("Result               : {}", result);
    LOGGER.info("Time Cost            : {} ms", System.currentTimeMillis() - start);

    return result;
}

@After("requestServer()")
public void doAfter(JoinPoint joinPoint) {
    LOGGER.info("===============================End========================");
}

/**
 * 获取入参
 * @param proceedingJoinPoint
 *
 * @return
 * */
private Map<String, Object> getRequestParams(ProceedingJoinPoint proceedingJoinPoint) {
    Map<String, Object> requestParams = new HashMap<>();

    //参数名
    String[] paramNames =

((MethodSignature)proceedingJoinPoint.getSignature()).getParameterNames();
//参数值
Object[] paramValues = proceedingJoinPoint.getArgs();

    for (int i = 0; i < paramNames.length; i++) {
        Object value = paramValues[i];

        //如果是文件对象
        if (value instanceof MultipartFile) {
            MultipartFile file = (MultipartFile) value;
            value = file.getOriginalFilename();  //获取文件名
        }

        requestParams.put(paramNames[i], value);
    }

    return requestParams;
}

}
复制代码

高并发下请求日志切面
写完以后对自己的代码很满意，但是想着可能还有完善的地方就和朋友交流了一下。emmmm

果然还有继续优化的地方
每个信息都打印一行，在高并发请求下确实会出现请求之间打印日志串行的问题，因为测试阶段请求数量较少没有出现串行的情况，果然生产环境才是第一发展力，能够遇到更多bug，写更健壮的代码
解决日志串行的问题只要将多行打印信息合并为一行就可以了，因此构造一个对象

RequestInfo.java
@Data
public class RequestInfo {
private String ip;
private String url;
private String httpMethod;
private String classMethod;
private Object requestParams;
private Object result;
private Long timeCost;
}
复制代码

环绕通知方法体
@Around(“requestServer()”)
public Object doAround(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
long start = System.currentTimeMillis();
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
Object result = proceedingJoinPoint.proceed();
RequestInfo requestInfo = new RequestInfo();
requestInfo.setIp(request.getRemoteAddr());
requestInfo.setUrl(request.getRequestURL().toString());
requestInfo.setHttpMethod(request.getMethod());
requestInfo.setClassMethod(String.format("%s.%s", proceedingJoinPoint.getSignature().getDeclaringTypeName(),
proceedingJoinPoint.getSignature().getName()));
requestInfo.setRequestParams(getRequestParamsByProceedingJoinPoint(proceedingJoinPoint));
requestInfo.setResult(result);
requestInfo.setTimeCost(System.currentTimeMillis() - start);
LOGGER.info(“Request Info : {}”, JSON.toJSONString(requestInfo));

return result;

}
复制代码将url、http request这些信息组装成RequestInfo对象，再序列化打印对象 打印序列化对象结果而不是直接打印对象是因为序列化有更直观、更清晰，同时可以借助在线解析工具对结果进行解析

是不是还不错
在解决高并发下请求串行问题的同时添加了对异常请求信息的打印，通过使用 @AfterThrowing注解对抛出异常的方法进行处理

RequestErrorInfo.java
@Data
public class RequestErrorInfo {
private String ip;
private String url;
private String httpMethod;
private String classMethod;
private Object requestParams;
private RuntimeException exception;
}
复制代码

异常通知环绕体
@AfterThrowing(pointcut = “requestServer()”, throwing = “e”)
public void doAfterThrow(JoinPoint joinPoint, RuntimeException e) {
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
RequestErrorInfo requestErrorInfo = new RequestErrorInfo();
requestErrorInfo.setIp(request.getRemoteAddr());
requestErrorInfo.setUrl(request.getRequestURL().toString());
requestErrorInfo.setHttpMethod(request.getMethod());
requestErrorInfo.setClassMethod(String.format("%s.%s", joinPoint.getSignature().getDeclaringTypeName(),
joinPoint.getSignature().getName()));
requestErrorInfo.setRequestParams(getRequestParamsByJoinPoint(joinPoint));
requestErrorInfo.setException(e);
LOGGER.info(“Error Request Info : {}”, JSON.toJSONString(requestErrorInfo));
}
复制代码对于异常，耗时是没有意义的，因此不统计耗时，而是添加了异常的打印

最后放一下完整日志请求切面代码：
@Component
@Aspect
public class RequestLogAspect {
private final static Logger LOGGER = LoggerFactory.getLogger(RequestLogAspect.class);

@Pointcut("execution(* your_package.controller..*(..))")
public void requestServer() {
}

@Around("requestServer()")
public Object doAround(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
    long start = System.currentTimeMillis();
    ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
    HttpServletRequest request = attributes.getRequest();
    Object result = proceedingJoinPoint.proceed();
    RequestInfo requestInfo = new RequestInfo();
            requestInfo.setIp(request.getRemoteAddr());
    requestInfo.setUrl(request.getRequestURL().toString());
    requestInfo.setHttpMethod(request.getMethod());
    requestInfo.setClassMethod(String.format("%s.%s", proceedingJoinPoint.getSignature().getDeclaringTypeName(),
            proceedingJoinPoint.getSignature().getName()));
    requestInfo.setRequestParams(getRequestParamsByProceedingJoinPoint(proceedingJoinPoint));
    requestInfo.setResult(result);
    requestInfo.setTimeCost(System.currentTimeMillis() - start);
    LOGGER.info("Request Info      : {}", JSON.toJSONString(requestInfo));

    return result;
}


@AfterThrowing(pointcut = "requestServer()", throwing = "e")
public void doAfterThrow(JoinPoint joinPoint, RuntimeException e) {
    ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
    HttpServletRequest request = attributes.getRequest();
    RequestErrorInfo requestErrorInfo = new RequestErrorInfo();
    requestErrorInfo.setIp(request.getRemoteAddr());
    requestErrorInfo.setUrl(request.getRequestURL().toString());
    requestErrorInfo.setHttpMethod(request.getMethod());
    requestErrorInfo.setClassMethod(String.format("%s.%s", joinPoint.getSignature().getDeclaringTypeName(),
            joinPoint.getSignature().getName()));
    requestErrorInfo.setRequestParams(getRequestParamsByJoinPoint(joinPoint));
    requestErrorInfo.setException(e);
    LOGGER.info("Error Request Info      : {}", JSON.toJSONString(requestErrorInfo));
}

/**
 * 获取入参
 * @param proceedingJoinPoint
 *
 * @return
 * */
private Map<String, Object> getRequestParamsByProceedingJoinPoint(ProceedingJoinPoint proceedingJoinPoint) {
    //参数名
    String[] paramNames = ((MethodSignature)proceedingJoinPoint.getSignature()).getParameterNames();
    //参数值
    Object[] paramValues = proceedingJoinPoint.getArgs();

    return buildRequestParam(paramNames, paramValues);
}

private Map<String, Object> getRequestParamsByJoinPoint(JoinPoint joinPoint) {
    //参数名
    String[] paramNames = ((MethodSignature)joinPoint.getSignature()).getParameterNames();
    //参数值
    Object[] paramValues = joinPoint.getArgs();

    return buildRequestParam(paramNames, paramValues);
}

private Map<String, Object> buildRequestParam(String[] paramNames, Object[] paramValues) {
    Map<String, Object> requestParams = new HashMap<>();
    for (int i = 0; i < paramNames.length; i++) {
        Object value = paramValues[i];

        //如果是文件对象
        if (value instanceof MultipartFile) {
            MultipartFile file = (MultipartFile) value;
            value = file.getOriginalFilename();  //获取文件名
        }

        requestParams.put(paramNames[i], value);
    }

    return requestParams;
}

@Data
public class RequestInfo {
    private String ip;
    private String url;
    private String httpMethod;
    private String classMethod;
    private Object requestParams;
    private Object result;
    private Long timeCost;
}

@Data
public class RequestErrorInfo {
    private String ip;
    private String url;
    private String httpMethod;
    private String classMethod;
    private Object requestParams;
    private RuntimeException exception;
}

}
复制代码赶紧给你们的应用加上吧【如果没加的话】，没有日志的话，总怀疑上层出错，但是却拿不出证据

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