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annotate pkg/scheduler/scheduler.go @ 1547:d4b7a6d054cd

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Add table to store import configuration.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 10 Dec 2018 15:55:10 +0100
parents 5f80ec319a4f
children fe633765e05b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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14 package scheduler
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15
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16 import (
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17 "errors"
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18 "sync"
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19
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20 "github.com/robfig/cron"
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21 )
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22
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23 // ErrNoSuchAction if no fitting action was found.
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24 var ErrNoSuchAction = errors.New("No such action")
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25
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26 // Action is called with a user and an optional configuration id.
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27 type Action func(user string, cfgID *int64)
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28
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29 type userAction struct {
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30 scheduler *scheduler
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31 user string
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32 name string
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33 cfgID *int64
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34 }
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35
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36 type scheduler struct {
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37 cr *cron.Cron
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38 actions map[string]Action
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39 mu sync.Mutex
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40 }
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41
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42 // Run implements cron.Job.
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43 func (ua *userAction) Run() {
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44 if a := ua.scheduler.action(ua.name); a != nil {
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45 a(ua.user, ua.cfgID)
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46 }
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47 }
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48
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49 var global = scheduler{
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50 cr: cron.New(),
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51 actions: make(map[string]Action),
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52 }
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53
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54 // RegisterAction registers a named action to the global scheduler.
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55 func RegisterAction(name string, action Action) {
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56 global.registerAction(name, action)
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57 }
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58
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59 // UnregisterAction ungesiters a named action from the global scheduler.
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60 func UnregisterAction(name string) {
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61 global.unregisterAction(name)
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62 }
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63
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64 // BindAction binds a named action to a user, a cron spec and
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65 // an optional configuration id.
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66 func BindAction(name, spec, user string, cfgID *int64) error {
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67 return global.bindAction(name, spec, user, cfgID)
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68 }
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69
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70 // UnbindAction unbins a named action from a user and and
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71 // an optional configuration id.
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72 func UnbindAction(name, user string, cfgID *int64) error {
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73 return global.unbindAction(name, user, cfgID)
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74 }
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75
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76 func UnbindUser(user string) {
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77 global.unbindUser(user)
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78 }
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79
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80 func sameCfgID(a, b *int64) bool {
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81 return (a == nil && b == nil) || (a != nil && b != nil && *a == *b)
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82 }
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83
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84 func (s *scheduler) unbindUser(user string) {
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85 s.mu.Lock()
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86 defer s.mu.Unlock()
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87
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88 entries := s.cr.Entries()
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89
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90 if len(entries) == 0 {
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91 return
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92 }
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93
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94 var found bool
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95 for _, entry := range entries {
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96 ua := entry.Job.(*userAction)
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97 if ua.user == user {
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98 found = true
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99 break
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100 }
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101 }
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102 if !found {
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103 return
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104 }
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105
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106 s.cr.Stop()
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107 s.cr = cron.New()
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108 for _, entry := range entries {
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109 ua := entry.Job.(*userAction)
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110 if ua.user != user {
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111 s.cr.Schedule(entry.Schedule, entry.Job)
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112 }
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113 }
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114 s.cr.Start()
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115 }
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116
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117 func (s *scheduler) unbindAction(name, user string, cfgID *int64) error {
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118 s.mu.Lock()
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119 defer s.mu.Unlock()
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120
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121 entries := s.cr.Entries()
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122
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123 var found *userAction
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124 for _, entry := range entries {
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125 ua := entry.Job.(*userAction)
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126 if ua.name == name && ua.user == user && sameCfgID(cfgID, ua.cfgID) {
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127 // Already have such a user/action/cfg tuple -> re-schedule.
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128 found = ua
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129 break
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130 }
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131 }
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132
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133 if found == nil {
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134 return ErrNoSuchAction
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135 }
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136
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137 s.cr.Stop()
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138 s.cr = cron.New()
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139 for _, entry := range entries {
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140 ua := entry.Job.(*userAction)
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141 if ua != found {
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142 s.cr.Schedule(entry.Schedule, entry.Job)
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143 }
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144 }
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145 s.cr.Start()
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146
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147 return nil
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148 }
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149
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150 func (s *scheduler) bindAction(name, spec, user string, cfgID *int64) error {
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151
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152 schedule, err := cron.Parse(spec)
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153 if err != nil {
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154 return err
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155 }
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156
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157 s.mu.Lock()
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158 defer s.mu.Unlock()
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159
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160 action := s.actions[name]
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161 if action == nil {
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162 return ErrNoSuchAction
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163 }
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164
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165 entries := s.cr.Entries()
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166
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167 var found *userAction
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168 for _, entry := range entries {
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169 ua := entry.Job.(*userAction)
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170 if ua.name == name && ua.user == user && sameCfgID(cfgID, ua.cfgID) {
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171 // Already have such a user/action/cfg tuple -> re-schedule.
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172 found = ua
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173 break
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174 }
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175 }
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176
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177 if found == nil {
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178 // Add to current plan.
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179 job := &userAction{scheduler: s, user: user, name: name, cfgID: cfgID}
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180 s.cr.Schedule(schedule, job)
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181 } else {
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182 // If found re-build all.
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183 s.cr.Stop()
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184 s.cr = cron.New()
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185 for _, entry := range entries {
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186 ua := entry.Job.(*userAction)
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187 var sch cron.Schedule
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188 if found == ua {
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189 // replace with new schedule.
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190 sch = schedule
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191 } else {
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192 sch = entry.Schedule
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193 }
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194 s.cr.Schedule(sch, entry.Job)
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195 }
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196 }
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197 s.cr.Start()
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198
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199 return nil
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200 }
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201
1541
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202 func (s *scheduler) action(name string) Action {
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203 s.mu.Lock()
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204 defer s.mu.Unlock()
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205 return s.actions[name]
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206 }
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207
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diff changeset
208 func (s *scheduler) registerAction(name string, action Action) {
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209 s.mu.Lock()
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210 defer s.mu.Unlock()
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211 s.actions[name] = action
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212 }
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213
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diff changeset
214 func (s *scheduler) unregisterAction(name string) {
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diff changeset
215 s.mu.Lock()
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diff changeset
216 defer s.mu.Unlock()
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217 delete(s.actions, name)
03fcad10104a Added an internal cron job executor which binds actions to tuples of cron schedule, user name and an optional configuation id.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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218 }