1/* 2Copyright (c) 2014 VMware, Inc. All Rights Reserved. 3 4Licensed under the Apache License, Version 2.0 (the "License"); 5you may not use this file except in compliance with the License. 6You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10Unless required by applicable law or agreed to in writing, software 11distributed under the License is distributed on an "AS IS" BASIS, 12WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13See the License for the specific language governing permissions and 14limitations under the License. 15*/ 16 17package progress 18 19type scaledReport struct { 20 Report 21 n int 22 i int 23} 24 25func (r scaledReport) Percentage() float32 { 26 b := 100 * float32(r.i) / float32(r.n) 27 return b + (r.Report.Percentage() / float32(r.n)) 28} 29 30type scaleOne struct { 31 s Sinker 32 n int 33 i int 34} 35 36func (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 43func (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 55type scaleMany struct { 56 s Sinker 57 n int 58 i int 59} 60 61func Scale(s Sinker, n int) Sinker { 62 return &scaleMany{ 63 s: s, 64 n: n, 65 } 66} 67 68func (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} 77