github.com/XiaoMi/Gaea@v1.2.5/stats/multidimensional.go (about)

     1  /*
     2  Copyright 2017 Google Inc.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreedto in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package stats
    18  
    19  import (
    20  	"fmt"
    21  	"strings"
    22  )
    23  
    24  // MultiTracker is a CountTracker that tracks counts grouping them by
    25  // more than one dimension.
    26  type MultiTracker interface {
    27  	CountTracker
    28  	Labels() []string
    29  }
    30  
    31  // CounterForDimension returns a CountTracker for the provided
    32  // dimension. It will panic if the dimension isn't a legal label for
    33  // mt.
    34  func CounterForDimension(mt MultiTracker, dimension string) CountTracker {
    35  	for i, lab := range mt.Labels() {
    36  		if lab == dimension {
    37  			return wrappedCountTracker{
    38  				f: func() map[string]int64 {
    39  					result := make(map[string]int64)
    40  					for k, v := range mt.Counts() {
    41  						if k == "All" {
    42  							result[k] = v
    43  							continue
    44  						}
    45  						result[strings.Split(k, ".")[i]] += v
    46  					}
    47  					return result
    48  				},
    49  			}
    50  		}
    51  	}
    52  
    53  	panic(fmt.Sprintf("label %v is not one of %v", dimension, mt.Labels()))
    54  }