Refactored MetricSearcher

[refactormachine]

Performed extract class operation for MetricSearcher. Extracted fields: charset, maxLinesReturn. Extracted Methods: readMetricsInOneFileByEndTime, readMetricsInOneFile, readMetricsByEndTime.

[CLAassistant]

All committers have signed the CLA.

[codecov-io]

Codecov Report

Merging #103 into master will decrease coverage by 0.18%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master     #103      +/-   ##
============================================
- Coverage     45.98%   45.79%   -0.19%     
+ Complexity      557      556       -1     
============================================
  Files           113      114       +1     
  Lines          3806     3813       +7     
  Branches        530      531       +1     
============================================
- Hits           1750     1746       -4     
- Misses         1846     1856      +10     
- Partials        210      211       +1

Impacted Files	Coverage Δ	Complexity Δ
...ibaba/csp/sentinel/node/metric/MetricSearcher.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...libaba/csp/sentinel/node/metric/MetricsReader.java	0% <0%> (ø)	0 <0> (?)
...ibaba/csp/sentinel/eagleeye/EagleEyeLogDaemon.java	24.24% <0%> (-6.07%)	5% <0%> (-1%)
...libaba/csp/sentinel/slots/block/flow/FlowRule.java	58.77% <0%> (-1.59%)	31% <0%> (ø)

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[tigerMoon]

about CLA check. you can set your git commit email set in your gitHub account. use 'git log' to see your commit email.

[CarpenterLee]

Please add Copyright and License here. Just copy the following:

/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

[CarpenterLee]

Please help me replace fileName + MetricWriter.METRIC_FILE_INDEX_SUFFIX with MetricWriter.formIndexFileName(fileName)

[refactormachine]

Thanks for the review! both me and the commiter signed the CLA.

[CarpenterLee]

LGTM