阎良做网站的公司小学四年级摘抄新闻

实现思路

1. 这里使用FutureTask，它通过get方法以阻塞的方式获取执行结果，并设定超时时间：

public V get() throws InterruptedException, ExecutionException ;public V get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException ;

2. 利用spring aop解耦业务
3. 定义业务异常信息

实现代码

定义注解：

@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.ANNOTATION_TYPE, ElementType.METHOD})
public @interface TimeoutCheck {/*** 超时时间，默认5秒*/long timeout() default 5L;/*** 超时单位，默认秒*/TimeUnit unit() default TimeUnit.SECONDS;/*** 超时后是否销毁线程*/boolean destroy() default true;
}

这里有一个destroy()的方法，因为我们在执行时开独立线程处理，所以这个方法是为了在超时后，用来判断是否销毁还在执行的线程；

定义异常：

注意：这里的父类应该是项目中的基础业务异常类；

public class TimeoutCheckException extends RuntimeException{public TimeoutCheckException(String message) {super(message);}public TimeoutCheckException(String message, Throwable throwable) {super(message, throwable);}
}

再顺便定义一个属性配置：

这个的作用是全局控制开关，当不需要的时候可以直接通过配置关闭；

@Component
@ConfigurationProperties(prefix = "aliweb.timeout")
public class TimeoutCheckProperties {private boolean enable = true;public boolean isEnable() {return enable;}public void setEnable(boolean enable) {this.enable = enable;}
}

最后就是我们的aop类：

@Aspect
@Component
public class TimeoutAop {private static final Logger logger = LoggerFactory.getLogger(TimeoutAop.class);@Autowiredprivate TimeoutCheckProperties timeoutCheckProperties;@Pointcut("@annotation(timeoutCheck)")public void pointCut(TimeoutCheck timeoutCheck) {}@Around(value = "pointCut(timeoutCheck)", argNames = "joinPoint, timeoutCheck")public Object around(ProceedingJoinPoint joinPoint, TimeoutCheck timeoutCheck) throws Throwable {if (!timeoutCheckProperties.isEnable()) {return joinPoint.proceed();}long timeout = timeoutCheck.timeout();if (timeout <= 0) {throw new TimeoutCheckException("业务逻辑执行时间不能小于等于0");}long start = System.currentTimeMillis();String msg = null;Exception error = null;Object data = null;FutureTask<Object> futureTask = createTask(joinPoint);try {Thread thread = new Thread(futureTask);thread.start();data = futureTask.get(timeout, timeoutCheck.unit());} catch (InterruptedException e) {msg = "执行中断";error = e;} catch (ExecutionException e) {msg = "执行异常";error = e;} catch (TimeoutException e) {msg = "执行超时";error = e;} finally {futureTask.cancel(timeoutCheck.destroy());}logger.debug("执行时间：{}", System.currentTimeMillis() - start);if (error != null) {String suf = error.getMessage() == null ? "" : "：" + error.getMessage();logger.error(msg + suf, error);throw new TimeoutCheckException(msg + suf, error);}return data;}private static FutureTask<Object> createTask(ProceedingJoinPoint joinPoint) {return new FutureTask<>(() -> {try {return joinPoint.proceed();} catch (Throwable e) {throw new RuntimeException(e);}});}}

starter组件

将功能提取成starter组件:

1. 定义配置类

@Configuration
@ComponentScan("com.liry.aliweb.timeout")
public class TimeoutCheckAutoConfig {
}

2. 定义配置扫描文件spring.factories，路径：

   src/main/resources/META-INF/spring.factories

   org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.liry.aliweb.timeout.config.TimeoutCheckAutoConfig
   

3. pom增加依赖：

   <dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-autoconfigure</artifactId>
   </dependency>
   

如上，在主项目引入时就可以直接使用了