如何检查数据库运行状况和连接池运行状况

Question

@Component
public class CustomHealthIndicator extends AbstractHealthIndicator {

@Override
protected void doHealthCheck(Health.Builder builder) throws Exception {
    // Use the builder to build the health status details that should be reported.
    // If you throw an exception, the status will be DOWN with the exception message.

    builder.up()
            .withDetail("app", "Alive and Kicking")
            .withDetail("error", "Nothing! I'm good.");
}

} 在这里，我注意到默认的健康检查是通过 /health 进行的，当 dataConnection 池缺少可用连接时，我想覆盖上面的内容，我需要返回未准备好的 pod。我还需要检查数据库的运行状况。如何实现？

Answer 1

多年来我都做过类似的事情。 根据我对 HikariDataSource 的经验，这是我的结果：

@Autowired
    private DataSource dataSource;

    @Override
    protected void doHealthCheck(Health.Builder builder) throws Exception {

        HikariDataSource ds = (HikariDataSource) dataSource;
        Integer maxSize = ds.getMaximumPoolSize();
        Integer active = new HikariDataSourcePoolMetadata(ds).getActive();
        Double usage = new Double((active / maxSize) * 100);

        Health.Builder workingBuilder;

        if(usage > 90) {
            workingBuilder = builder.down();
        }else {
            workingBuilder = builder.up();
        }

        workingBuilder.withDetail("max", maxSize) //
        .withDetail("active", active)//
        .withDetail("usage", usage);
    }

也许Actuator Metrics或使用

有更好的方法

   ds.getHealthCheckProperties()
   ds.getHealthCheckRegistry()