通过mybatis拦截器给sql执行加一个耗时监控

代码没什么内容，直接贴上来吧，其中costTimeUtil可以看我的另一篇博文：java实现一个不带次数变量的加权平均值算法-CSDN博客

@Slf4j
@Intercepts({@Signature(
    type = StatementHandler.class,
    method = "query",
    args = {Statement.class, ResultHandler.class}
), @Signature(
    type = StatementHandler.class,
    method = "queryCursor",
    args = {Statement.class}
), @Signature(
    type = StatementHandler.class,
    method = "update",
    args = {Statement.class}
), @Signature(
    type = StatementHandler.class,
    method = "batch",
    args = {Statement.class}
)})
public class MetricOnDbQueryInterceptor implements Interceptor {


  private static final String MAPPER_SLOW_SQL_METRIC = "MetricOnDbQueryInterceptor_cost";
  @Resource
  private AlertOnTimesOfAverageCostTimeUtil costTimeUtil;

  @Override
  public Object intercept(Invocation invocation) throws Throwable {
    long start = System.currentTimeMillis();
    try {
      return invocation.proceed();
    } finally {
      String sql = ((StatementHandler) invocation.getTarget()).getBoundSql().getSql();
      long costTime = System.currentTimeMillis() - start;
      if (costTimeUtil.shouldDoTheMetricWork(sql, costTime)) {
        //这里可以做一些监控打点的功能
        log.warn("it is a slow sql query:{}, costTime:{}", sql, costTime);
      }
    }
  }
}