Mercurial > gemma

annotate pkg/mesh/areas.go @ 5591:0011f50cf216 surveysperbottleneckid

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Removed no longer used alternative api for surveys/ endpoint. As bottlenecks in the summary for SR imports are now identified by their id and no longer by the (not guarantied to be unique!) name, there is no longer the need to request survey data by the name+date tuple (which isn't reliable anyway). So the workaround was now reversed.
author Sascha Wilde <wilde@sha-bang.de>
date Wed, 06 Apr 2022 13:30:29 +0200
parents 181c2c05b12a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 // This is Free Software under GNU Affero General Public License v >= 3.0
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2 // without warranty, see README.md and license for details.
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3 //
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4 // SPDX-License-Identifier: AGPL-3.0-or-later
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5 // License-Filename: LICENSES/AGPL-3.0.txt
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6 //
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7 // Copyright (C) 2018 by via donau
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH
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9 // Software engineering by Intevation GmbH
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10 //
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11 // Author(s):
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
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13
4827
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14 package mesh
4570
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15
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16 import (
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17 "runtime"
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18 "sync"
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19
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20 "gemma.intevation.de/gemma/pkg/common"
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21 )
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22
4853
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23 // GenerateRandomVertices generates n random vertices.
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24 // X/Y values are diced between the X/Y components of min and max.
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25 // eval is called to find out the corresponding Z value.
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26 // The random vertices are are transfered in chunks to
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27 // the callback function.
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28 func GenerateRandomVertices(
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29 n int,
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30 min, max Vertex,
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31 eval func(float64, float64) (float64, bool),
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32 callback func([]Vertex),
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33 ) {
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34 var wg sync.WaitGroup
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35
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36 jobs := make(chan int)
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37 out := make(chan []Vertex)
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38 done := make(chan struct{})
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39
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40 cpus := runtime.NumCPU()
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41
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42 free := make(chan []Vertex, cpus)
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43
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44 for i := 0; i < cpus; i++ {
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45 wg.Add(1)
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46 go func() {
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47 defer wg.Done()
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48 xRange := common.Random(min.X, max.X)
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49 yRange := common.Random(min.Y, max.Y)
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50
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51 for size := range jobs {
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52 var vertices []Vertex
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53 select {
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54 case vertices = <-free:
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55 default:
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56 vertices = make([]Vertex, 0, 1000)
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57 }
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58 for len(vertices) < size {
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59 x, y := xRange(), yRange()
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60 if z, ok := eval(x, y); ok {
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61 vertices = append(vertices, Vertex{X: x, Y: y, Z: z})
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62 }
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63 }
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64 out <- vertices
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65 }
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66 }()
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67 }
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68
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69 go func() {
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70 defer close(done)
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71 for vertices := range out {
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72 callback(vertices)
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73 select {
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74 case free <- vertices[:0]:
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75 default:
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76 }
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77 }
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78 }()
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79
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80 for remain := n; remain > 0; {
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81 if remain > 1000 {
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82 jobs <- 1000
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83 remain -= 1000
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84 } else {
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85 jobs <- remain
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86 remain = 0
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87 }
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88 }
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89 close(jobs)
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90 wg.Wait()
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91 close(out)
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92 <-done
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93 }