yunion.io/x/cloudmux@v0.3.10-0-alpha.1/pkg/multicloud/azure/progress/computeStats.go (about)

     1  // Copyright 2019 Yunion
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package progress
    16  
    17  // ComputeStats type supports computing running average with a given window size.
    18  //
    19  type ComputeStats struct {
    20  	history []float64
    21  	size    int
    22  	p       int
    23  }
    24  
    25  // NewComputeStats returns a new instance of ComputeStats. The parameter size is the
    26  // maximum number of values that ComputeStats track at any given point of time.
    27  //
    28  func NewComputeStats(size int) *ComputeStats {
    29  	return &ComputeStats{
    30  		history: make([]float64, size),
    31  		size:    size,
    32  		p:       0,
    33  	}
    34  }
    35  
    36  // NewComputestateDefaultSize returns a new instance of ComputeStats that can tracks
    37  // maximum of 60 values.
    38  //
    39  func NewComputestateDefaultSize() *ComputeStats {
    40  	return NewComputeStats(60)
    41  }
    42  
    43  // ComputeAvg adds the given value to a list containing set of previous values added
    44  // and returns the average of the values in the list. If the values list reached the
    45  // maximum size then oldest value will be removed
    46  //
    47  func (s *ComputeStats) ComputeAvg(current float64) float64 {
    48  	s.history[s.p] = current
    49  	s.p++
    50  	if s.p == s.size {
    51  		s.p = 0
    52  	}
    53  
    54  	sum := float64(0)
    55  	for i := 0; i < s.size; i++ {
    56  		sum += s.history[i]
    57  	}
    58  
    59  	return sum / float64(s.size)
    60  }