1 | package test.rewolucja.scheduling.implementation; |
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2 | |
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3 | import eduni.simjava.Sim_event; |
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4 | import eduni.simjava.Sim_system; |
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5 | import gridsim.Accumulator; |
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6 | import gridsim.GridSim; |
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7 | import gridsim.GridSimTags; |
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8 | import gridsim.Gridlet; |
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9 | import gridsim.ResourceCalendar; |
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10 | import gridsim.gssim.GssimConstants; |
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11 | import gridsim.gssim.GssimTags; |
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12 | import gridsim.gssim.ResourceHistoryItem; |
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13 | import gridsim.gssim.SubmittedTask; |
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14 | import gridsim.gssim.filter.SubTaskFilter; |
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15 | import grms.shared.constants.BrokerConstants; |
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16 | import gssim.schedframe.scheduling.AbstractExecutable; |
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17 | import gssim.schedframe.scheduling.ExecTaskInterface; |
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18 | import gssim.schedframe.scheduling.Executable; |
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19 | |
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20 | import java.util.ArrayList; |
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21 | import java.util.HashMap; |
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22 | import java.util.Iterator; |
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23 | import java.util.List; |
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24 | import java.util.Map; |
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25 | import java.util.Properties; |
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26 | |
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27 | import org.apache.commons.logging.Log; |
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28 | import org.apache.commons.logging.LogFactory; |
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29 | import org.joda.time.DateTime; |
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30 | import org.qcg.broker.schemas.schedulingplan.types.AllocationStatus; |
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31 | |
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32 | import schedframe.resources.units.ResourceUnit; |
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33 | import schedframe.scheduling.events.SchedulingEvent; |
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34 | import schedframe.scheduling.events.SchedulingEventReason; |
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35 | import schedframe.scheduling.events.SchedulingEventType; |
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36 | import schedframe.scheduling.events.StartTaskExecutionEvent; |
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37 | import schedframe.scheduling.events.TaskCanceledEvent; |
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38 | import schedframe.scheduling.events.TaskFinishedEvent; |
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39 | import schedframe.scheduling.plugin.SchedulingPluginConfiguration; |
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40 | import schedframe.scheduling.plugin.estimation.ExecTimeEstimationPlugin; |
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41 | import schedframe.scheduling.plugin.grid.ModuleListImpl; |
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42 | import schedframe.scheduling.plugin.grid.ModuleType; |
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43 | import schedframe.scheduling.plugin.local.LocalSchedulingPlugin; |
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44 | import schedframe.scheduling.utils.ResourceParameterName; |
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45 | import simulator.utils.DoubleMath; |
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46 | import simulator.utils.InstanceFactory; |
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47 | import test.rewolucja.GSSIMJobInterface; |
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48 | import test.rewolucja.energy.EnergyEvent; |
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49 | import test.rewolucja.energy.EnergyEventType; |
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50 | import test.rewolucja.resources.ProcessingElements; |
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51 | import test.rewolucja.resources.ResourceStatus; |
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52 | import test.rewolucja.resources.ResourceType; |
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53 | import test.rewolucja.resources.description.ExecResourceDescription; |
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54 | import test.rewolucja.resources.exception.ResourceException; |
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55 | import test.rewolucja.resources.logical.LogicalResource; |
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56 | import test.rewolucja.resources.manager.factory.ResourceManagerFactory; |
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57 | import test.rewolucja.resources.manager.implementation.ResourceManager; |
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58 | import test.rewolucja.resources.manager.interfaces.ResourceManagerInterface; |
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59 | import test.rewolucja.resources.manager.utils.ResourceManagerUtils; |
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60 | import test.rewolucja.resources.physical.base.ComputingResource; |
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61 | import test.rewolucja.scheduling.plan.AllocationInterfaceNew; |
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62 | import test.rewolucja.scheduling.plan.ScheduledTaskInterfaceNew; |
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63 | import test.rewolucja.scheduling.plan.SchedulingPlanInterfaceNew; |
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64 | import test.rewolucja.task.JobList; |
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65 | |
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66 | public class LocalManagementSystem extends ManagementSystem { |
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67 | |
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68 | private Log log = LogFactory.getLog(LocalManagementSystem.class); |
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69 | |
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70 | protected double lastUpdateTime; |
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71 | |
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72 | protected Accumulator accTotalLoad_; |
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73 | |
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74 | public LocalManagementSystem(String providerId, String entityName, String schedulingPluginClassName, |
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75 | ExecTimeEstimationPlugin execTimeEstimationPlugin, ExecResourceDescription resourceDescription) |
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76 | throws Exception { |
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77 | |
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78 | super(providerId, entityName, schedulingPluginClassName, execTimeEstimationPlugin, resourceDescription); |
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79 | |
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80 | schedulingPlugin = (LocalSchedulingPlugin) InstanceFactory.createInstance(schedulingPluginClassName, LocalSchedulingPlugin.class); |
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81 | if (schedulingPlugin == null) { |
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82 | throw new Exception("Can not create local scheduling plugin instance."); |
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83 | } |
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84 | |
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85 | accTotalLoad_ = new Accumulator(); |
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86 | moduleList = new ModuleListImpl(1); |
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87 | |
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88 | } |
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89 | |
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90 | public void init(LogicalResource logRes) { |
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91 | logicalResource = logRes; |
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92 | resourceManager = (ResourceManager) ResourceManagerFactory.createResourceManager(logicalResource); |
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93 | double load = 0; |
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94 | accTotalLoad_.add(load); |
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95 | } |
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96 | |
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97 | public void processEvent(Sim_event ev) { |
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98 | |
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99 | updateProcessingProgress(); |
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100 | |
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101 | int tag = ev.get_tag(); |
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102 | Object obj; |
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103 | |
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104 | switch (tag) { |
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105 | |
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106 | case GssimTags.TIMER: |
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107 | if (pluginSupportsEvent(tag)) { |
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108 | SchedulingEvent event = new SchedulingEvent(SchedulingEventType.TIMER); |
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109 | SchedulingPlanInterfaceNew decision = schedulingPlugin.schedule(event, |
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110 | queues, getJobRegistry(), getResourceManager(), moduleList); |
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111 | executeSchedulingPlan(decision); |
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112 | } |
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113 | sendTimerEvent(); |
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114 | |
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115 | break; |
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116 | |
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117 | case GssimTags.TASK_READY_FOR_EXECUTION: |
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118 | Executable data = (Executable) ev.get_data(); |
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119 | |
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120 | try { |
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121 | data.setGridletStatus(Gridlet.READY); |
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122 | if (pluginSupportsEvent(tag)) { |
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123 | SchedulingEvent event = new StartTaskExecutionEvent(data.getJobId(), data.getId()); |
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124 | SchedulingPlanInterfaceNew decision = schedulingPlugin.schedule(event, |
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125 | queues, getJobRegistry(), getResourceManager(), moduleList); |
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126 | executeSchedulingPlan(decision); |
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127 | |
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128 | } |
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129 | } catch (Exception e) { |
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130 | e.printStackTrace(); |
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131 | } |
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132 | break; |
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133 | |
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134 | case GssimTags.TASK_EXECUTION_FINISHED: |
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135 | obj = ev.get_data(); |
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136 | SubmittedTask task = (SubmittedTask) obj; |
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137 | if (task.getStatus() == Gridlet.INEXEC) { |
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138 | task.setGridletStatus(Gridlet.SUCCESS); |
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139 | task.finalizeGridlet(); |
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140 | log.debug(task.getJobId() + "_" + task.getId() + " finished execution on " + new DateTime()); |
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141 | log.info(GssimConstants.USAGE_MEASURE_NAME + ": " + calculateTotalLoad(jobRegistry.getRunningTasks().size())); |
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142 | List<ResourceHistoryItem> lastUsedList = task.getUsedResources(); |
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143 | Map<ResourceParameterName, ResourceUnit> lastUsed = lastUsedList.get(lastUsedList.size() - 1) |
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144 | .getResourceUnits(); |
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145 | getAllocationManager().freeResources(lastUsed); |
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146 | ProcessingElements pes = (ProcessingElements) lastUsed.get(ResourceParameterName.PROCESSINGELEMENTS); |
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147 | for (ComputingResource resource : pes) { |
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148 | resource.handleEvent(new EnergyEvent(EnergyEventType.TASK_FINISHED, task)); |
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149 | } |
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150 | super.sendFinishJob((AbstractExecutable) task.getGridlet()); |
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151 | } |
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152 | |
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153 | if (pluginSupportsEvent(tag)) { |
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154 | SchedulingEvent event = new TaskFinishedEvent(task.getJobId(), task.getId()); |
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155 | SchedulingPlanInterfaceNew decision = schedulingPlugin.schedule(event, |
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156 | queues, getJobRegistry(), getResourceManager(), moduleList); |
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157 | executeSchedulingPlan(decision); |
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158 | } |
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159 | |
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160 | break; |
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161 | case GssimTags.TASK_REQUESTED_TIME_EXPIRED: |
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162 | obj = ev.get_data(); |
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163 | |
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164 | if (pluginSupportsEvent(tag)) { |
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165 | SchedulingEvent event = new SchedulingEvent(SchedulingEventType.TASK_REQUESTED_TIME_EXPIRED); |
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166 | SchedulingPlanInterfaceNew decision = schedulingPlugin.schedule(event, |
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167 | queues, getJobRegistry(), getResourceManager(), moduleList); |
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168 | executeSchedulingPlan(decision); |
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169 | } |
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170 | |
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171 | break; |
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172 | case GssimTags.UPDATE: |
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173 | updateProcessingTimes(ev); |
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174 | break; |
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175 | } |
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176 | } |
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177 | |
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178 | public void notifySubmittedJob(GSSIMJobInterface<?> job, boolean ack) { |
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179 | if (job instanceof AbstractExecutable) { |
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180 | AbstractExecutable executable = (AbstractExecutable) job; |
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181 | // int cost = |
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182 | // this.resourceManager.getResourceCharacteristic().getResUnits() != |
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183 | // null ? |
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184 | // this.resourceManager.getResourceCharacteristic().getResUnits().get(ResourceParameterName.COST).getAmount() |
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185 | // : 1; |
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186 | executable.setResourceParameter(logicalResource.get_id(), 1); |
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187 | |
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188 | updateProcessingProgress(); |
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189 | JobList newTasks = new JobList(); |
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190 | SubmittedTask submittedTask = jobRegistry.getSubmittedTask(executable.getJobId(), executable.getId()); |
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191 | if(submittedTask == null) |
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192 | { submittedTask = new SubmittedTask((Executable) executable); |
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193 | jobRegistry.addTask(submittedTask); |
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194 | } |
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195 | LogicalResource logicalRes = logicalResource; |
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196 | submittedTask.addToResPath(logicalRes.get_name()); |
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197 | while (logicalRes != null && !submittedTask.getResPath().contains(logicalRes.get_name())) { |
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198 | submittedTask.addToResPath(logicalRes.get_name()); |
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199 | logicalRes = logicalRes.getParent(); |
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200 | } |
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201 | newTasks.add(submittedTask); |
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202 | schedulingPlugin.placeJobsInQueues(newTasks, queues, getResourceManager(), moduleList); |
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203 | |
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204 | if (job.getStatus() == Gridlet.QUEUED) { |
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205 | sendJobReadyEvent(job); |
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206 | } |
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207 | } |
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208 | } |
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209 | |
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210 | public void notifyReturnedJob(GSSIMJobInterface<?> job) { |
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211 | if (pluginSupportsEvent(GssimTags.TASK_EXECUTION_FINISHED)) { |
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212 | SchedulingEvent event = new SchedulingEvent(SchedulingEventType.TASK_FINISHED); |
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213 | SchedulingPlanInterfaceNew decision = schedulingPlugin.schedule(event, |
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214 | queues, getJobRegistry(), getResourceManager(), moduleList); |
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215 | executeSchedulingPlan(decision); |
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216 | } |
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217 | if(logicalResource.getParent() != null){ |
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218 | sendFinishJob((AbstractExecutable)job); |
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219 | } |
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220 | } |
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221 | |
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222 | public void notifyCanceledJob(GSSIMJobInterface<?> job) { |
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223 | |
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224 | if (!pluginSupportsEvent(GridSimTags.GRIDLET_CANCEL)) |
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225 | return; |
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226 | |
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227 | Executable executable = (Executable) job; |
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228 | String jobID = executable.getJobId(); |
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229 | |
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230 | SchedulingPlanInterfaceNew decision = null; |
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231 | |
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232 | try { |
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233 | |
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234 | executable.setStatus((int) BrokerConstants.JOB_STATUS_CANCELED); |
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235 | |
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236 | TaskCanceledEvent event = new TaskCanceledEvent(executable.getJobId(), executable.getTaskId()); |
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237 | event.setReason(SchedulingEventReason.RESERVATION_EXCEEDED); |
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238 | decision = schedulingPlugin |
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239 | .schedule(event, queues, getJobRegistry(), getResourceManager(), moduleList); |
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240 | |
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241 | if (decision == null) |
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242 | return; |
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243 | |
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244 | executeSchedulingPlan(decision); |
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245 | |
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246 | } catch (Exception e) { |
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247 | log.error("Exception during scheduling. " + e.getMessage()); |
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248 | e.printStackTrace(); |
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249 | } |
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250 | } |
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251 | |
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252 | protected void executeSchedulingPlan(SchedulingPlanInterfaceNew decision) { |
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253 | |
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254 | ArrayList<ScheduledTaskInterfaceNew> taskSchedulingDecisions = decision.getTasks(); |
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255 | for (int i = 0; i < taskSchedulingDecisions.size(); i++) { |
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256 | try { |
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257 | ScheduledTaskInterfaceNew taskDecision = taskSchedulingDecisions.get(i); |
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258 | |
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259 | // not scheduled again are returned to the user. |
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260 | if (taskDecision.getStatus() == AllocationStatus.REJECTED) { |
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261 | continue; |
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262 | } |
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263 | |
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264 | ArrayList<AllocationInterfaceNew> allocations = taskDecision.getAllocations(); |
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265 | |
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266 | GSSIMJobInterface<?> task = taskDecision.getTask(); |
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267 | for (int j = 0; j < allocations.size(); j++) { |
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268 | |
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269 | AllocationInterfaceNew allocation = allocations.get(j); |
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270 | if (allocation.isProcessing()) { |
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271 | executeTask(task, allocation.getRequestedResources()); |
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272 | //} else if(GridSim.getEntityId(allocation.getProviderName()) != -1 || logicalResource.getLogicalResource(allocation.getProviderName())!=null){ |
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273 | } else if(resourceManager.getResourceProvider(allocation.getProviderName()) != null){ |
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274 | allocation.setProviderName(resourceManager.getResourceProvider(allocation.getProviderName())); |
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275 | submitJob(task, allocation); |
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276 | } else { |
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277 | executeTask(task, chooseResourcesForExecution(allocation.getProviderName(), (ExecTaskInterface)task)); |
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278 | } |
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279 | } |
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280 | |
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281 | } catch (Exception e) { |
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282 | e.printStackTrace(); |
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283 | } |
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284 | } |
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285 | } |
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286 | |
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287 | protected void executeTask(GSSIMJobInterface<?> job, Map<ResourceParameterName, ResourceUnit> choosenResources) { |
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288 | ExecTaskInterface task = (ExecTaskInterface) job; |
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289 | SubmittedTask submittedTask = (SubmittedTask) task; |
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290 | |
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291 | boolean allocationStatus = getAllocationManager().allocateResources(choosenResources); |
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292 | if(allocationStatus == false) |
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293 | return; |
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294 | removeFromQueue(task); |
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295 | double completionPercentage = (submittedTask.getLength() - submittedTask.getRemainingGridletLength())/submittedTask.getLength(); |
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296 | SchedulingEvent event = new SchedulingEvent(SchedulingEventType.START_TASK_EXECUTION); |
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297 | int time = Double.valueOf( |
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298 | forecastFinishTimePlugin.execTimeEstimation(event, choosenResources, task, completionPercentage)).intValue(); |
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299 | log.debug(task.getJobId() + "_" + task.getId() + " starts executing on " + new DateTime() |
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300 | + " will finish after " + time); |
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301 | |
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302 | if (time < 0.0) |
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303 | return; |
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304 | submittedTask.setGridletStatus(Gridlet.INEXEC); |
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305 | log.info(GssimConstants.USAGE_MEASURE_NAME + ": " + calculateTotalLoad(jobRegistry.getRunningTasks().size())); |
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306 | |
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307 | jobRegistry.saveHistory(submittedTask, time, choosenResources); |
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308 | |
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309 | logicalResource.sendInternal(time, GssimTags.TASK_EXECUTION_FINISHED, |
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310 | submittedTask); |
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311 | |
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312 | try { |
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313 | long expectedDuration = submittedTask.getExpectedDuration().getMillis() / 1000; |
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314 | logicalResource.sendInternal(expectedDuration, GssimTags.TASK_REQUESTED_TIME_EXPIRED, submittedTask); |
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315 | } catch (NoSuchFieldException e) { |
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316 | double t = submittedTask.getEstimatedDuration(); |
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317 | logicalResource.sendInternal(t, GssimTags.TASK_REQUESTED_TIME_EXPIRED, submittedTask); |
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318 | } |
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319 | |
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320 | ProcessingElements pes = (ProcessingElements) choosenResources.get(ResourceParameterName.PROCESSINGELEMENTS); |
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321 | for (ComputingResource resource : pes) { |
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322 | resource.handleEvent(new EnergyEvent(EnergyEventType.TASK_STARTED, submittedTask)); |
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323 | } |
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324 | |
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325 | |
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326 | } |
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327 | |
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328 | protected void updateProcessingProgress() { |
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329 | double timeSpan = DoubleMath.subtract(Sim_system.clock(), lastUpdateTime); |
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330 | if (timeSpan <= 0.0) { |
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331 | // don't update when nothing changed |
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332 | return; |
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333 | } |
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334 | lastUpdateTime = Sim_system.clock(); |
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335 | Iterator<ExecTaskInterface> iter = jobRegistry.getRunningTasks().iterator(); |
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336 | while (iter.hasNext()) { |
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337 | ExecTaskInterface task = iter.next(); |
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338 | SubmittedTask subTask = (SubmittedTask)task; |
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339 | List<ResourceHistoryItem> usedResourcesList = subTask.getUsedResources(); |
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340 | ResourceUnit unit = usedResourcesList.get(usedResourcesList.size() - 1).getResourceUnits() |
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341 | .get(ResourceParameterName.PROCESSINGELEMENTS); |
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342 | |
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343 | double load = getMIShare(timeSpan, (ProcessingElements) unit); |
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344 | subTask.updateGridletFinishedSoFar(load); |
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345 | addTotalLoad(load); |
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346 | } |
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347 | } |
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348 | |
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349 | private double getMIShare(double timeSpan, ProcessingElements pes) { |
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350 | double localLoad; |
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351 | ResourceCalendar resCalendar = (ResourceCalendar) moduleList.getModule(ModuleType.RESOURCE_CALENDAR); |
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352 | if (resCalendar == null) |
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353 | localLoad = 0; |
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354 | else |
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355 | // 1 - localLoad_ = available MI share percentage |
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356 | localLoad = resCalendar.getCurrentLoad(); |
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357 | |
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358 | int speed = pes.getSpeed(); |
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359 | int cnt = pes.getAmount(); |
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360 | |
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361 | double totalMI = speed * cnt * timeSpan * (1 - localLoad); |
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362 | return totalMI; |
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363 | } |
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364 | |
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365 | protected void updateProcessingTimes(Sim_event ev) { |
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366 | updateProcessingProgress(); |
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367 | for (ExecTaskInterface task : jobRegistry.getRunningTasks()) { |
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368 | SubmittedTask subTask = (SubmittedTask)task; |
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369 | Map<ResourceParameterName, ResourceUnit> choosenResources = subTask.getUsedResources() |
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370 | .get(subTask.getUsedResources().size() - 1).getResourceUnits(); |
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371 | double completionPercentage = (task.getLength() - subTask.getRemainingGridletLength())/task.getLength(); |
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372 | double time = forecastFinishTimePlugin.execTimeEstimation(null, choosenResources, task, |
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373 | completionPercentage); |
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374 | if(!subTask.getResPath().contains(ev.get_data().toString())) { |
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375 | continue; |
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376 | } else if( DoubleMath.subtract(subTask.getEstimatedDuration(), (time + lastUpdateTime)) == 0.0){ |
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377 | continue; |
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378 | } |
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379 | SubTaskFilter filter = new SubTaskFilter(subTask.getGridletID(), GssimTags.TASK_EXECUTION_FINISHED); |
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380 | logicalResource.sim_cancel(filter, null); |
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381 | logicalResource.sendInternal(time, GssimTags.TASK_EXECUTION_FINISHED, task); |
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382 | |
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383 | } |
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384 | } |
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385 | |
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386 | public boolean pluginSupportsEvent(int eventType) { |
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387 | SchedulingPluginConfiguration config = (SchedulingPluginConfiguration) schedulingPlugin.getConfiguration(); |
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388 | if (config == null) |
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389 | return false; |
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390 | |
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391 | Map<SchedulingEventType, Object> servedEvent = config.getServedEvents(); |
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392 | if (servedEvent == null) |
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393 | return false; |
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394 | |
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395 | switch (eventType) { |
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396 | |
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397 | case GssimTags.TIMER: |
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398 | return servedEvent.containsKey(SchedulingEventType.TIMER); |
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399 | |
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400 | case GssimTags.GRIDLET_SUBMIT: |
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401 | return servedEvent.containsKey(SchedulingEventType.TASK_ARRIVED); |
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402 | |
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403 | case GssimTags.TASK_READY_FOR_EXECUTION: |
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404 | return servedEvent.containsKey(SchedulingEventType.START_TASK_EXECUTION); |
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405 | case GssimTags.TASK_EXECUTION_FINISHED: |
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406 | return servedEvent.containsKey(SchedulingEventType.TASK_FINISHED); |
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407 | case GssimTags.GRIDLET_CANCEL: |
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408 | return servedEvent.containsKey(SchedulingEventType.TASK_CANCELED); |
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409 | case GssimTags.GRIDLET_RESUME: |
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410 | return servedEvent.containsKey(SchedulingEventType.TASK_ARRIVED); |
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411 | |
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412 | case GssimTags.GRIDRESOURCE_FAILURE: |
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413 | return servedEvent.containsKey(SchedulingEventType.RESOURCE_FAILED); |
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414 | |
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415 | |
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416 | case GssimTags.TASK_REQUESTED_TIME_EXPIRED: |
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417 | return servedEvent.containsKey(SchedulingEventType.TASK_REQUESTED_TIME_EXPIRED); |
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418 | |
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419 | default: |
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420 | return false; |
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421 | } |
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422 | } |
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423 | |
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424 | public double calculateTotalLoad(int size) { |
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425 | // background load, defined during initialization |
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426 | double load; |
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427 | ResourceCalendar resCalendar = (ResourceCalendar) moduleList.getModule(ModuleType.RESOURCE_CALENDAR); |
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428 | if (resCalendar == null) |
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429 | load = 0; |
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430 | else |
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431 | load = resCalendar.getCurrentLoad(); |
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432 | |
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433 | double numberOfPE; |
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434 | try { |
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435 | numberOfPE = resourceManager.getResourcesOfType(ResourceType.CPU).size(); |
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436 | } catch (Exception e) { |
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437 | numberOfPE = 1; |
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438 | } |
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439 | double tasksPerPE = (double) size / numberOfPE; |
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440 | load += Math.min(1.0 - load, tasksPerPE); |
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441 | |
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442 | return load; |
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443 | } |
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444 | |
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445 | public Accumulator getTotalLoad() { |
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446 | return accTotalLoad_; |
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447 | } |
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448 | |
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449 | protected void addTotalLoad(double load) { |
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450 | accTotalLoad_.add(load); |
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451 | } |
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452 | |
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453 | private HashMap<ResourceParameterName, ResourceUnit> chooseResourcesForExecution(String resourceName, |
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454 | ExecTaskInterface task) { |
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455 | |
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456 | ResourceManagerInterface resourceManager = this.resourceManager; |
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457 | if(resourceName != null){ |
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458 | ComputingResource resource = null; |
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459 | try { |
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460 | resource = resourceManager.getResourceByName(resourceName); |
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461 | } catch (ResourceException e) { |
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462 | return null; |
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463 | } |
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464 | |
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465 | resourceManager = new ResourceManager(resource); |
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466 | } |
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467 | HashMap<ResourceParameterName, ResourceUnit> map = new HashMap<ResourceParameterName, ResourceUnit>(); |
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468 | |
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469 | List<ComputingResource> choosenResources = null; |
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470 | int cpuRequest; |
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471 | try { |
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472 | cpuRequest = Double.valueOf(task.getCpuCntRequest()).intValue(); |
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473 | } catch (NoSuchFieldException e) { |
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474 | cpuRequest = 1; |
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475 | } |
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476 | |
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477 | if (cpuRequest != 0) { |
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478 | List<? extends ComputingResource> processingElements = null; |
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479 | try { |
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480 | Properties properties = new Properties(); |
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481 | properties.setProperty("type", ResourceType.CPU.toString()); |
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482 | processingElements = resourceManager.filterResources(properties); |
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483 | } catch (Exception e) { |
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484 | e.printStackTrace(); |
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485 | } |
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486 | |
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487 | choosenResources = new ArrayList<ComputingResource>(); |
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488 | |
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489 | for (int i = 0; i < processingElements.size() && cpuRequest > 0; i++) { |
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490 | if (processingElements.get(i).getStatus() == ResourceStatus.FREE) { |
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491 | choosenResources.add(processingElements.get(i)); |
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492 | cpuRequest--; |
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493 | } |
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494 | } |
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495 | if (cpuRequest > 0) |
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496 | { |
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497 | return null; |
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498 | } |
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499 | |
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500 | ProcessingElements result = new ProcessingElements(ResourceManagerUtils.getCommonParent(choosenResources).getName()); |
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501 | result.addAll(choosenResources); |
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502 | map.put(ResourceParameterName.PROCESSINGELEMENTS, result); |
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503 | } |
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504 | return map; |
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505 | } |
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506 | |
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507 | |
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508 | } |
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