com.alibaba.csp.sentinel.node.metric

Class MetricSearcher

java.lang.Object

com.alibaba.csp.sentinel.node.metric.MetricSearcher

public class MetricSearcher
extends Object

从指定目录下找出所有的metric文件，并按照指定时间戳进行检索，参考find(long, int)。 会借助索引以提高检索效率，参考MetricWriter；还会在内部缓存上一次检索的文件指针，以便下一次顺序检索时 减少读盘次数。

Author:

leyou

Constructor Summary

Constructors

Constructor and Description
MetricSearcher(String baseDir, String baseFileName)
MetricSearcher(String baseDir, String baseFileName, Charset charset)

Method Summary

Modifier and Type	Method and Description
List<MetricNode>	find(long beginTimeMs, int recommendLines) 从beginTime开始，检索recommendLines条(大概)记录。同一秒中的数据是原子的，不能分割成多次查询。
List<MetricNode>	findByTimeAndResource(long beginTimeMs, long endTimeMs, String identity) Find metric between [beginTimeMs, endTimeMs], both side inclusive.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MetricSearcher

public MetricSearcher(String baseDir,
                      String baseFileName)

Parameters:

baseDir - metric文件所在目录

baseFileName - metric文件名的关键字，比如 alihot-metrics.log

MetricSearcher

public MetricSearcher(String baseDir,
                      String baseFileName,
                      Charset charset)

Parameters:

baseDir - metric文件所在目录

baseFileName - metric文件名的关键字，比如 alihot-metrics.log

charset -

Method Detail

find

public List<MetricNode> find(long beginTimeMs,
                             int recommendLines)
                      throws Exception

从beginTime开始，检索recommendLines条(大概)记录。同一秒中的数据是原子的，不能分割成多次查询。

Parameters:

beginTimeMs - 检索的最小时间戳

recommendLines - 查询最多想得到的记录条数，返回条数会尽可能不超过这个数字。但是为保证每一秒的数据不被分割，有时候 返回的记录条数会大于该数字。

Returns:

Throws:

Exception

findByTimeAndResource

public List<MetricNode> findByTimeAndResource(long beginTimeMs,
                                              long endTimeMs,
                                              String identity)
                                       throws Exception

Find metric between [beginTimeMs, endTimeMs], both side inclusive. When identity is null, all metric between the time intervalMs will be read, otherwise, only the specific identity will be read.

Throws:

Exception