1 | using System;
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2 | using System.Collections.Generic;
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3 | using System.Linq;
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4 | using System.Threading;
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5 | using System.Threading.Tasks;
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6 | using HeuristicLab.Clients.Hive;
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7 | using HeuristicLab.Common;
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8 | using HeuristicLab.Core;
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9 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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10 |
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11 | namespace HeuristicLab.HiveEngine {
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12 | /// <summary>
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13 | /// Represents an engine that executes operations which can be executed in parallel on the hive
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14 | /// </summary>
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15 | [StorableClass]
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16 | [Item("Hive Engine", "Engine for parallel execution on the hive. You need enable `Parallel` for at least one operator in your operator graph to have all childoperations parallelized. Also those childoperations must not have sideeffects on a higher scope.")]
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17 | public class HiveEngine : Engine {
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18 | private static object logLocker = new object();
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19 | private CancellationToken cancellationToken;
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20 |
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21 | [Storable]
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22 | private IOperator currentOperator;
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23 |
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24 | [Storable]
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25 | public string ResourceNames { get; set; }
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26 |
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27 | [Storable]
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28 | private int priority;
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29 | public int Priority {
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30 | get { return priority; }
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31 | set { priority = value; }
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32 | }
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33 |
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34 | [Storable]
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35 | private TimeSpan executionTimeOnHive;
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36 | public TimeSpan ExecutionTimeOnHive {
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37 | get { return executionTimeOnHive; }
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38 | set {
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39 | if (value != executionTimeOnHive) {
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40 | executionTimeOnHive = value;
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41 | OnExecutionTimeOnHiveChanged();
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42 | }
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43 | }
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44 | }
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45 |
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46 | [Storable]
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47 | private bool useLocalPlugins;
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48 | public bool UseLocalPlugins {
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49 | get { return useLocalPlugins; }
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50 | set { useLocalPlugins = value; }
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51 | }
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52 |
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53 | // [Storable] -> HiveExperiment can't be storable, so RefreshableHiveExperiment can't be stored
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54 | private ItemCollection<RefreshableHiveExperiment> hiveExperiments = new ItemCollection<RefreshableHiveExperiment>();
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55 | public ItemCollection<RefreshableHiveExperiment> HiveExperiments {
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56 | get { return hiveExperiments; }
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57 | set { hiveExperiments = value; }
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58 | }
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59 |
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60 | private List<Plugin> onlinePlugins;
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61 | public List<Plugin> OnlinePlugins {
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62 | get { return onlinePlugins; }
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63 | set { onlinePlugins = value; }
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64 | }
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65 |
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66 | private List<Plugin> alreadyUploadedPlugins;
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67 | public List<Plugin> AlreadyUploadedPlugins {
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68 | get { return alreadyUploadedPlugins; }
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69 | set { alreadyUploadedPlugins = value; }
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70 | }
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71 |
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72 | #region constructors and cloning
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73 | public HiveEngine() {
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74 | ResourceNames = "HEAL";
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75 | Priority = 0;
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76 | }
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77 |
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78 | [StorableConstructor]
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79 | protected HiveEngine(bool deserializing) : base(deserializing) { }
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80 | protected HiveEngine(HiveEngine original, Cloner cloner)
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81 | : base(original, cloner) {
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82 | this.ResourceNames = original.ResourceNames;
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83 | this.currentOperator = cloner.Clone(original.currentOperator);
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84 | this.priority = original.priority;
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85 | this.executionTimeOnHive = original.executionTimeOnHive;
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86 | this.useLocalPlugins = original.useLocalPlugins;
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87 | this.hiveExperiments = cloner.Clone(original.hiveExperiments);
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88 | }
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89 | public override IDeepCloneable Clone(Cloner cloner) {
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90 | return new HiveEngine(this, cloner);
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91 | }
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92 | #endregion
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93 |
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94 | #region Events
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95 | protected override void OnPrepared() {
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96 | base.OnPrepared();
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97 | this.ExecutionTimeOnHive = TimeSpan.Zero;
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98 | }
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99 |
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100 | public event EventHandler ExecutionTimeOnHiveChanged;
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101 | protected virtual void OnExecutionTimeOnHiveChanged() {
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102 | var handler = ExecutionTimeOnHiveChanged;
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103 | if (handler != null) handler(this, EventArgs.Empty);
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104 | }
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105 | #endregion
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106 |
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107 | protected override void Run(CancellationToken cancellationToken) {
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108 | this.cancellationToken = cancellationToken;
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109 | Run(ExecutionStack);
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110 | }
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111 |
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112 | private void Run(object state) {
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113 | Stack<IOperation> executionStack = (Stack<IOperation>)state;
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114 | IOperation next;
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115 | OperationCollection coll;
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116 | IAtomicOperation operation;
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117 | TaskScheduler.UnobservedTaskException += new EventHandler<UnobservedTaskExceptionEventArgs>(TaskScheduler_UnobservedTaskException);
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118 |
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119 | this.OnlinePlugins = ServiceLocator.Instance.CallHiveService(s => s.GetPlugins()).Where(x => x.IsLocal == false).ToList();
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120 | this.AlreadyUploadedPlugins = new List<Plugin>();
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121 |
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122 | while (ExecutionStack.Count > 0) {
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123 | cancellationToken.ThrowIfCancellationRequested();
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124 |
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125 | next = ExecutionStack.Pop();
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126 | if (next is OperationCollection) {
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127 | coll = (OperationCollection)next;
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128 | if (coll.Parallel) {
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129 | // clone the parent scope here and reuse it for each operation. otherwise for each job the whole scope-tree first needs to be copied and then cleaned, which causes a lot of work for the Garbage Collector
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130 | IScope parentScopeClone = (IScope)((IAtomicOperation)coll.First()).Scope.Parent.Clone();
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131 | parentScopeClone.SubScopes.Clear();
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132 | parentScopeClone.ClearParentScopes();
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133 |
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134 | EngineJob[] jobs = new EngineJob[coll.Count];
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135 | for (int i = 0; i < coll.Count; i++) {
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136 | jobs[i] = new EngineJob(coll[i], new SequentialEngine.SequentialEngine());
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137 | }
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138 |
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139 | IScope[] scopes = ExecuteOnHive(jobs, parentScopeClone, cancellationToken);
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140 | //IScope[] scopes = ExecuteLocally(jobs, parentScopeClone, cancellationToken);
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141 |
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142 | for (int i = 0; i < coll.Count; i++) {
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143 | if (coll[i] is IAtomicOperation) {
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144 | ExchangeScope(scopes[i], ((IAtomicOperation)coll[i]).Scope);
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145 | } else if (coll[i] is OperationCollection) {
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146 | // todo ??
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147 | }
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148 | }
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149 | } else {
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150 | for (int i = coll.Count - 1; i >= 0; i--)
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151 | if (coll[i] != null) executionStack.Push(coll[i]);
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152 | }
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153 | } else if (next is IAtomicOperation) {
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154 | operation = (IAtomicOperation)next;
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155 | try {
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156 | next = operation.Operator.Execute((IExecutionContext)operation, cancellationToken);
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157 | }
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158 | catch (Exception ex) {
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159 | ExecutionStack.Push(operation);
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160 | if (ex is OperationCanceledException) throw ex;
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161 | else throw new OperatorExecutionException(operation.Operator, ex);
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162 | }
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163 | if (next != null) ExecutionStack.Push(next);
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164 |
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165 | if (operation.Operator.Breakpoint) {
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166 | LogMessage(string.Format("Breakpoint: {0}", operation.Operator.Name != string.Empty ? operation.Operator.Name : operation.Operator.ItemName));
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167 | Pause();
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168 | }
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169 | }
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170 | }
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171 | }
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172 |
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173 | private void TaskScheduler_UnobservedTaskException(object sender, UnobservedTaskExceptionEventArgs e) {
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174 | e.SetObserved(); // avoid crash of process
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175 | }
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176 |
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177 | private IRandom FindRandomParameter(IExecutionContext ec) {
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178 | try {
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179 | if (ec == null)
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180 | return null;
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181 |
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182 | foreach (var p in ec.Parameters) {
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183 | if (p.Name == "Random" && p is IValueParameter)
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184 | return ((IValueParameter)p).Value as IRandom;
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185 | }
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186 | return FindRandomParameter(ec.Parent);
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187 | }
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188 | catch { return null; }
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189 | }
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190 |
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191 | private static void ReIntegrateScope(IAtomicOperation source, IAtomicOperation target) {
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192 | ExchangeScope(source.Scope, target.Scope);
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193 | }
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194 |
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195 | private static void ExchangeScope(IScope source, IScope target) {
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196 | target.Variables.Clear();
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197 | target.Variables.AddRange(source.Variables);
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198 | target.SubScopes.Clear();
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199 | target.SubScopes.AddRange(source.SubScopes);
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200 | // TODO: validate if parent scopes match - otherwise source is invalid
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201 | }
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202 |
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203 | /// <summary>
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204 | /// This method blocks until all jobs are finished
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205 | /// TODO: Cancelation needs to be refined; all tasks currently stay in Semaphore.WaitOne after cancelation
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206 | /// </summary>
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207 | /// <param name="jobs"></param>
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208 | private IScope[] ExecuteOnHive(EngineJob[] jobs, IScope parentScopeClone, CancellationToken cancellationToken) {
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209 | LogMessage(string.Format("Executing {0} operations on the hive.", jobs.Length));
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210 | IScope[] scopes = new Scope[jobs.Length];
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211 | object locker = new object();
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212 | IDictionary<Guid, int> jobIndices = new Dictionary<Guid, int>();
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213 | var hiveExperiment = new HiveExperiment();
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214 |
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215 | try {
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216 | List<Guid> remainingJobIds = new List<Guid>();
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217 |
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218 | // create hive experiment
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219 | hiveExperiment.Name = "HiveEngine Run " + hiveExperiments.Count;
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220 | hiveExperiment.DateCreated = DateTime.Now;
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221 | hiveExperiment.UseLocalPlugins = this.UseLocalPlugins;
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222 | hiveExperiment.ResourceNames = this.ResourceNames;
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223 | var refreshableHiveExperiment = new RefreshableHiveExperiment(hiveExperiment);
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224 | refreshableHiveExperiment.IsControllable = false;
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225 | hiveExperiments.Add(refreshableHiveExperiment);
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226 |
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227 | // create upload-tasks
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228 | var uploadTasks = new List<Task<Job>>();
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229 | for (int i = 0; i < jobs.Length; i++) {
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230 | hiveExperiment.HiveJobs.Add(new EngineHiveJob(jobs[i], parentScopeClone));
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231 |
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232 | // shuffle random variable to avoid the same random sequence in each operation; todo: does not yet work (it cannot find the random variable)
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233 | IRandom random = FindRandomParameter(jobs[i].InitialOperation as IExecutionContext);
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234 | if (random != null)
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235 | random.Reset(random.Next());
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236 | }
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237 | ExperimentManagerClient.StartExperiment((e) => {
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238 | LogException(e);
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239 | }, refreshableHiveExperiment);
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240 |
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241 | // do polling until experiment is finished and all jobs are downloaded
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242 | while (!refreshableHiveExperiment.AllJobsFinished()) {
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243 | Thread.Sleep(500);
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244 | this.ExecutionTimeOnHive = TimeSpan.FromMilliseconds(hiveExperiments.Sum(x => x.HiveExperiment.ExecutionTime.TotalMilliseconds));
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245 | cancellationToken.ThrowIfCancellationRequested();
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246 | }
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247 | LogMessage(string.Format("{0} finished (TotalExecutionTime: {1}).", refreshableHiveExperiment.ToString(), refreshableHiveExperiment.HiveExperiment.ExecutionTime));
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248 |
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249 | // get scopes
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250 | int j = 0;
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251 | foreach (var hiveJob in hiveExperiment.HiveJobs) {
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252 | var scope = ((IAtomicOperation) ((EngineJob)hiveJob.ItemJob).InitialOperation).Scope;
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253 | scopes[j++] = scope;
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254 | }
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255 | refreshableHiveExperiment.RefreshAutomatically = false;
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256 | DeleteHiveExperiment(hiveExperiment.Id);
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257 | ClearData(refreshableHiveExperiment);
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258 | return scopes;
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259 | }
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260 | catch (OperationCanceledException e) {
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261 | lock (locker) {
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262 | if (jobIndices != null) DeleteHiveExperiment(hiveExperiment.Id);
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263 | }
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264 | throw e;
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265 | }
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266 | catch (Exception e) {
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267 | lock (locker) {
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268 | if (jobIndices != null) DeleteHiveExperiment(hiveExperiment.Id);
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269 | }
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270 | LogException(e);
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271 | throw e;
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272 | }
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273 | }
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274 |
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275 | private void ClearData(RefreshableHiveExperiment refreshableHiveExperiment) {
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276 | var jobs = refreshableHiveExperiment.HiveExperiment.GetAllHiveJobs();
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277 | foreach (var job in jobs) {
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278 | job.ClearData();
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279 | }
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280 | }
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281 |
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282 | private void DeleteHiveExperiment(Guid hiveExperimentId) {
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283 | ExperimentManagerClient.TryAndRepeat(() => {
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284 | ServiceLocator.Instance.CallHiveService(s => s.DeleteHiveExperiment(hiveExperimentId));
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285 | }, 5, string.Format("Could not delete jobs"));
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286 | }
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287 |
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288 | private List<Guid> GetResourceIds() {
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289 | return ServiceLocator.Instance.CallHiveService(service => {
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290 | var resourceNames = ResourceNames.Split(';');
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291 | var resourceIds = new List<Guid>();
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292 | foreach (var resourceName in resourceNames) {
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293 | Guid resourceId = service.GetResourceId(resourceName);
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294 | if (resourceId == Guid.Empty) {
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295 | throw new ResourceNotFoundException(string.Format("Could not find the resource '{0}'", resourceName));
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296 | }
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297 | resourceIds.Add(resourceId);
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298 | }
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299 | return resourceIds;
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300 | });
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301 | }
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302 |
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303 | /// <summary>
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304 | /// Threadsafe message logging
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305 | /// </summary>
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306 | private void LogMessage(string message) {
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307 | lock (logLocker) {
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308 | Log.LogMessage(message);
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309 | }
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310 | }
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311 |
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312 | /// <summary>
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313 | /// Threadsafe exception logging
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314 | /// </summary>
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315 | private void LogException(Exception exception) {
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316 | lock (logLocker) {
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317 | Log.LogException(exception);
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318 | }
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319 | }
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320 |
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321 | // testfunction:
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322 | //private IScope[] ExecuteLocally(EngineJob[] jobs, IScope parentScopeClone, CancellationToken cancellationToken) {
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323 | // IScope[] scopes = new Scope[jobs.Length];
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324 | // for (int i = 0; i < jobs.Length; i++) {
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325 | // var serialized = PersistenceUtil.Serialize(jobs[i]);
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326 | // var deserialized = PersistenceUtil.Deserialize<IJob>(serialized);
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327 | // deserialized.Start();
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328 | // while (deserialized.ExecutionState != ExecutionState.Stopped) {
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329 | // Thread.Sleep(100);
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330 | // }
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331 | // var serialized2 = PersistenceUtil.Serialize(deserialized);
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332 | // var deserialized2 = PersistenceUtil.Deserialize<EngineJob>(serialized2);
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333 | // var newScope = ((IAtomicOperation)deserialized2.InitialOperation).Scope;
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334 | // scopes[i] = newScope;
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335 | // }
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336 | // return scopes;
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337 | //}
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338 | }
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339 | }
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