github.com/vmware/govmomi@v0.37.1/vim25/progress/scale.go (about)

     1  /*
     2  Copyright (c) 2014 VMware, Inc. All Rights Reserved.
     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 agreed to 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 progress
    18  
    19  type scaledReport struct {
    20  	Report
    21  	n int
    22  	i int
    23  }
    24  
    25  func (r scaledReport) Percentage() float32 {
    26  	b := 100 * float32(r.i) / float32(r.n)
    27  	return b + (r.Report.Percentage() / float32(r.n))
    28  }
    29  
    30  type scaleOne struct {
    31  	s Sinker
    32  	n int
    33  	i int
    34  }
    35  
    36  func (s scaleOne) Sink() chan<- Report {
    37  	upstream := make(chan Report)
    38  	downstream := s.s.Sink()
    39  	go s.loop(upstream, downstream)
    40  	return upstream
    41  }
    42  
    43  func (s scaleOne) loop(upstream <-chan Report, downstream chan<- Report) {
    44  	defer close(downstream)
    45  
    46  	for r := range upstream {
    47  		downstream <- scaledReport{
    48  			Report: r,
    49  			n:      s.n,
    50  			i:      s.i,
    51  		}
    52  	}
    53  }
    54  
    55  type scaleMany struct {
    56  	s Sinker
    57  	n int
    58  	i int
    59  }
    60  
    61  func Scale(s Sinker, n int) Sinker {
    62  	return &scaleMany{
    63  		s: s,
    64  		n: n,
    65  	}
    66  }
    67  
    68  func (s *scaleMany) Sink() chan<- Report {
    69  	if s.i == s.n {
    70  		s.n++
    71  	}
    72  
    73  	ch := scaleOne{s: s.s, n: s.n, i: s.i}.Sink()
    74  	s.i++
    75  	return ch
    76  }