Mercurial > gemma

annotate pkg/octree/cache.go @ 725:e0437ec46798

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Finished the octree cache. TODO: implement the deserialization.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sat, 22 Sep 2018 09:55:42 +0200
parents 6ab0c170e5b8
children 41c8dc61f38f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 package octree
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2
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3 import (
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4 "context"
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5 "database/sql"
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6 "sync"
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7 "time"
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8 )
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9
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10 type (
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11 cacheKey struct {
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12 date time.Time
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13 bottleneck string
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14 }
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15
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16 cacheEntry struct {
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17 checksum string
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18 tree *Octree
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19 access time.Time
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20 }
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21 OctreeCache struct {
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22 sync.Mutex
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23 entries map[cacheKey]*cacheEntry
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24 }
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25 )
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26
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27 const (
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28 cleanupCacheSleep = 6 * time.Minute
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29 maxCacheAge = 5 * time.Minute
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30 maxCacheEntries = 4
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31 )
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32
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33 const (
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34 fetchOctreeSQL = `
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35 SELECT checksum, octree_index
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36 FROM waterway.octrees ot
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37 JOIN waterway.sounding_results sr ON ot.sounding_result_id = sr.id
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38 WHERE sr.bottleneck_id = $1 AND sr.date_info = $2::date
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39 `
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40 checkOctreeSQL = `
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41 SELECT CASE
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42 WHEN checksum = $3 THEN NULL
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43 ELSE ot.octree_index
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44 END
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45 FROM waterway.octrees ot
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46 JOIN waterway.sounding_results sr ON ot.sounding_result_id = sr.id
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47 WHERE sr.bottleneck_id = $1 AND sr.date_info = $2::date
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48 `
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49 )
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50
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51 var Cache = OctreeCache{
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52 entries: map[cacheKey]*cacheEntry{},
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53 }
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54
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55 func init() {
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56 go Cache.background()
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57 }
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58
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59 func (oc *OctreeCache) background() {
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60 for {
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61 time.Sleep(cleanupCacheSleep)
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62 oc.cleanup()
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63 }
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64 }
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65
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66 func (oc *OctreeCache) cleanup() {
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67 oc.Lock()
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68 defer oc.Unlock()
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69 good := time.Now().Add(-maxCacheAge)
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70 for k, v := range oc.entries {
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71 if v.access.Before(good) {
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72 delete(oc.entries, k)
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73 }
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74 }
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75 }
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76
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77 func (oc *OctreeCache) Get(
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78 bottleneck string, date time.Time,
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79 conn *sql.Conn, ctx context.Context,
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80 ) (*Octree, error) {
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81 oc.Lock()
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82 defer oc.Unlock()
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83
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84 key := cacheKey{date, bottleneck}
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85 entry := oc.entries[key]
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86
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87 var data []byte
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88 var checksum string
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89
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90 if entry == nil {
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91 // fetch from database
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92 err := conn.QueryRowContext(
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93 ctx, fetchOctreeSQL, bottleneck, date).Scan(&checksum, &data)
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94 switch {
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95 case err == sql.ErrNoRows:
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96 return nil, nil
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97 case err != nil:
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98 return nil, err
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99 }
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100 } else {
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101 // check if we are not outdated.
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102 err := conn.QueryRowContext(
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103 ctx, checkOctreeSQL, bottleneck, date, entry.checksum).Scan(&data)
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104 switch {
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105 case err == sql.ErrNoRows:
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106 return nil, nil
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107 case err != nil:
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108 return nil, err
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109 }
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110 if data == nil { // we are still current
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111 entry.access = time.Now()
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112 return entry.tree, nil
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113 }
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114 }
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115
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116 tree, err := Deserialize(data)
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117 if err != nil {
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118 return nil, err
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119 }
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120
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121 now := time.Now()
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122
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123 if entry != nil {
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124 entry.tree = tree
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125 entry.access = now
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126 return tree, nil
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127 }
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128
725
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parents: 724
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129 for len(oc.entries) >= maxCacheEntries {
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130 // Evict the entry that is accessed the longest time ago.
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131 var oldestKey cacheKey
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132 oldest := now
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133
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134 for k, v := range oc.entries {
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135 if v.access.Before(oldest) {
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136 oldest = v.access
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137 oldestKey = k
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138 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 724
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139 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 724
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140 delete(oc.entries, oldestKey)
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parents: 724
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141 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 724
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142
e0437ec46798 Finished the octree cache. TODO: implement the deserialization.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 724
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143 oc.entries[key] = &cacheEntry{
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parents: 724
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144 checksum: checksum,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 724
diff changeset
145 tree: tree,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 724
diff changeset
146 access: now,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 724
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147 }
e0437ec46798 Finished the octree cache. TODO: implement the deserialization.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 724
diff changeset
148
e0437ec46798 Finished the octree cache. TODO: implement the deserialization.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 724
diff changeset
149 return tree, nil
723
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parents:
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150 }