Mercurial > projects > dwt2
annotate java/src/java/util/Timer.d @ 19:52184e4b815c
no more direct tango.core.Thread. Rename JThread to java.lang.Thread.
author | Frank Benoit <benoit@tionex.de> |
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date | Wed, 18 Mar 2009 10:55:25 +0100 |
parents | bc29606a740c |
children | 9b96950f2c3c |
rev | line source |
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1 module java.util.Timer; |
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2 |
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3 import java.util.TimerTask; |
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4 // import tango.util.container.CircularList; |
19
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5 import java.lang.Thread; |
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6 import tango.core.sync.Mutex; |
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7 import tango.core.sync.Condition; |
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8 // import tango.time.Time; |
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9 // import tango.time.Clock; |
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10 import tango.text.convert.Format; |
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11 import java.lang.all; |
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12 |
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13 class Timer { |
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14 private static final class TaskQueue { |
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15 private Mutex mutex; |
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16 private Condition cond; |
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17 |
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18 |
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19 private static const int DEFAULT_SIZE = 32; |
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20 private bool nullOnEmpty; |
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21 private TimerTask heap[]; |
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22 private int elements; |
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23 public this() { |
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24 mutex = new Mutex(); |
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25 cond = new Condition( mutex ); |
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26 heap = new TimerTask[DEFAULT_SIZE]; |
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27 elements = 0; |
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28 nullOnEmpty = false; |
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29 } |
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30 |
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31 private void add(TimerTask task) { |
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32 elements++; |
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33 if (elements is heap.length) { |
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34 TimerTask new_heap[] = new TimerTask[heap.length * 2]; |
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35 System.arraycopy(heap, 0, new_heap, 0, heap.length); |
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36 heap = new_heap; |
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37 } |
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38 heap[elements] = task; |
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39 } |
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40 |
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41 private void remove() { |
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42 // clear the entry first |
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43 heap[elements] = null; |
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44 elements--; |
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45 if (elements + DEFAULT_SIZE / 2 <= (heap.length / 4)) { |
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46 TimerTask new_heap[] = new TimerTask[heap.length / 2]; |
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47 System.arraycopy(heap, 0, new_heap, 0, elements + 1); |
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48 heap = new_heap; |
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49 } |
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50 } |
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51 |
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52 public void enqueue(TimerTask task) { |
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53 synchronized( mutex ){ |
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54 if (heap is null) { |
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55 throw new IllegalStateException("cannot enqueue when stop() has been called on queue"); |
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56 } |
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57 |
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58 heap[0] = task; |
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59 add(task); |
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60 int child = elements; |
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61 int parent = child / 2; |
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62 while (heap[parent].scheduled > task.scheduled) { |
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63 heap[child] = heap[parent]; |
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64 child = parent; |
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65 parent = child / 2; |
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66 } |
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67 heap[child] = task; |
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68 heap[0] = null; |
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69 cond.notify(); |
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70 } |
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71 } |
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72 |
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73 private TimerTask top() { |
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74 if (elements is 0) { |
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75 return null; |
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76 } |
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77 else { |
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78 return heap[1]; |
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79 } |
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80 } |
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81 |
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82 public TimerTask serve() { |
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83 synchronized( mutex ){ |
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84 TimerTask task = null; |
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85 while (task is null) { |
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86 task = top(); |
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87 |
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88 if ((heap is null) || (task is null && nullOnEmpty)) { |
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89 return null; |
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90 } |
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91 |
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92 if (task !is null) { |
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93 // The time to wait until the task should be served |
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94 long time = task.scheduled - System.currentTimeMillis(); |
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95 if (time > 0) { |
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96 // This task should not yet be served |
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97 // So wait until this task is ready |
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98 // or something else happens to the queue |
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99 task = null; // set to null to make sure we call top() |
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100 try { |
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101 cond.wait(time); |
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102 } |
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103 catch (InterruptedException _) { |
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104 } |
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105 } |
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106 } |
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107 else { |
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108 // wait until a task is added |
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109 // or something else happens to the queue |
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110 try { |
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111 cond.wait(); |
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112 } |
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113 catch (InterruptedException _) { |
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114 } |
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115 } |
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116 } |
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117 |
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118 TimerTask lastTask = heap[elements]; |
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119 remove(); |
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120 |
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121 int parent = 1; |
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122 int child = 2; |
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123 heap[1] = lastTask; |
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124 while (child <= elements) { |
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125 if (child < elements) { |
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126 if (heap[child].scheduled > heap[child + 1].scheduled) { |
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127 child++; |
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128 } |
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129 } |
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130 |
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131 if (lastTask.scheduled <= heap[child].scheduled) |
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132 break; |
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133 |
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134 heap[parent] = heap[child]; |
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135 parent = child; |
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136 child = parent * 2; |
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137 } |
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138 |
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139 heap[parent] = lastTask; |
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140 return task; |
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141 } |
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142 } |
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143 |
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144 public void setNullOnEmpty(bool nullOnEmpty) { |
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145 synchronized( mutex ){ |
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146 this.nullOnEmpty = nullOnEmpty; |
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147 cond.notify(); |
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148 } |
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149 } |
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150 |
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151 public void stop() { |
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152 synchronized( mutex ){ |
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153 this.heap = null; |
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154 this.elements = 0; |
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155 cond.notify(); |
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156 } |
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157 } |
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158 |
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159 } |
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160 |
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161 private static final class Scheduler : Runnable { |
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162 private TaskQueue queue; |
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163 |
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164 public this(TaskQueue queue) { |
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165 this.queue = queue; |
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166 } |
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167 |
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168 public void run() { |
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169 TimerTask task; |
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170 while ((task = queue.serve()) !is null) { |
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171 if (task.scheduled >= 0) { |
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172 task.lastExecutionTime = task.scheduled; |
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173 if (task.period < 0) { |
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174 task.scheduled = -1; |
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175 } |
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176 try { |
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177 task.run(); |
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178 } |
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179 // catch (ThreadDeath death) { |
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180 // // If an exception escapes, the Timer becomes invalid. |
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181 // queue.stop(); |
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182 // throw death; |
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183 // } |
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184 catch (Exception t) { |
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185 queue.stop(); |
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186 } |
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187 } |
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188 if (task.scheduled >= 0) { |
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189 if (task.fixed) { |
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190 task.scheduled += task.period; |
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191 } |
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192 else { |
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193 task.scheduled = task.period + System.currentTimeMillis(); |
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194 } |
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195 |
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196 try { |
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197 queue.enqueue(task); |
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198 } |
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199 catch (IllegalStateException ise) { |
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200 // Ignore. Apparently the Timer queue has been stopped. |
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201 } |
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202 } |
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203 } |
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204 } |
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205 } |
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206 |
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207 private static int nr; |
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208 private TaskQueue queue; |
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209 private Scheduler scheduler; |
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210 private Thread thread; |
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211 private bool canceled; |
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212 |
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213 public this() { |
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214 this(false); |
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215 } |
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216 |
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217 public this(bool daemon) { |
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218 this(daemon, Thread.NORM_PRIORITY); |
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219 } |
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220 |
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221 private this(bool daemon, int priority) { |
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222 this(daemon, priority, Format( "Timer-{}", ++nr)); |
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223 } |
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224 |
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225 private this(bool daemon, int priority, String name) { |
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226 canceled = false; |
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227 queue = new TaskQueue(); |
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228 scheduler = new Scheduler(queue); |
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229 thread = new Thread(scheduler, name); |
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230 thread.setDaemon(daemon); |
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231 thread.setPriority(priority); |
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232 thread.start(); |
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233 } |
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234 |
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235 public void cancel() { |
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236 canceled = true; |
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237 queue.stop(); |
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238 } |
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239 |
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240 private void schedule(TimerTask task, long time, long period, bool fixed) { |
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241 if (time < 0) |
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242 throw new IllegalArgumentException("negative time"); |
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243 |
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244 if (task.scheduled is 0 && task.lastExecutionTime is -1) { |
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245 task.scheduled = time; |
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246 task.period = period; |
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247 task.fixed = fixed; |
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248 } |
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249 else { |
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250 throw new IllegalStateException("task was already scheduled or canceled"); |
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251 } |
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252 |
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253 if (!this.canceled && this.thread !is null) { |
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254 queue.enqueue(task); |
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255 } |
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256 else { |
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257 throw new IllegalStateException("timer was canceled or scheduler thread has died"); |
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258 } |
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259 } |
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260 |
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261 private static void positiveDelay(long delay) { |
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262 if (delay < 0) { |
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263 throw new IllegalArgumentException("delay is negative"); |
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264 } |
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265 } |
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266 |
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267 private static void positivePeriod(long period) { |
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268 if (period < 0) { |
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269 throw new IllegalArgumentException("period is negative"); |
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270 } |
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271 } |
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272 |
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273 // public void schedule(TimerTask task, Date date) { |
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274 // long time = date.getTime(); |
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275 // schedule(task, time, -1, false); |
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276 // } |
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277 |
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278 // public void schedule(TimerTask task, Date date, long period) { |
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279 // positivePeriod(period); |
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280 // long time = date.getTime(); |
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281 // schedule(task, time, period, false); |
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282 // } |
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283 |
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284 public void schedule(TimerTask task, long delay) { |
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285 positiveDelay(delay); |
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286 long time = System.currentTimeMillis() + delay; |
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287 schedule(task, time, -1, false); |
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288 } |
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289 |
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290 public void schedule(TimerTask task, long delay, long period) { |
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291 positiveDelay(delay); |
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292 positivePeriod(period); |
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293 long time = System.currentTimeMillis() + delay; |
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294 schedule(task, time, period, false); |
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295 } |
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296 |
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297 // public void scheduleAtFixedRate(TimerTask task, Date date, long period) { |
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298 // positivePeriod(period); |
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299 // long time = date.getTime(); |
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300 // schedule(task, time, period, true); |
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301 // } |
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302 |
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303 public void scheduleAtFixedRate(TimerTask task, long delay, long period) { |
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304 positiveDelay(delay); |
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305 positivePeriod(period); |
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306 long time = System.currentTimeMillis() + delay; |
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307 schedule(task, time, period, true); |
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308 } |
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309 |
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310 protected void finalize() { |
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311 queue.setNullOnEmpty(true); |
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312 } |
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313 |
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314 |
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315 /////////////////////////////////////////////////// |
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316 /+ alias CircularList!( TimerTask ) ListType; |
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317 |
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318 private Thread thread; |
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319 private ListType schedules; |
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320 private Mutex mutex; |
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321 private Condition cond; |
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322 private bool isCanceled = false; |
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323 |
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324 this(){ |
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325 this(false); |
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326 } |
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327 this(bool isDaemon){ |
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328 mutex = new Mutex(); |
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329 cond = new Condition( mutex ); |
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330 |
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331 schedules = new ListType(); |
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332 thread = new Thread( &run ); |
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333 thread.setDaemon( isDaemon ); |
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334 thread.start(); |
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335 } |
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336 private void run(){ |
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337 |
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338 while( !isCanceled ){ |
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339 TimerTask timerTask = null; |
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340 synchronized(mutex){ |
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341 bool isReady = false; |
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342 do{ |
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343 if( isCanceled ){ |
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344 return; |
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345 } |
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346 |
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347 if( schedules.size() is 0 ){ |
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348 cond.wait(); |
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349 } |
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350 else{ |
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351 timerTask = schedules.head(); |
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352 TimeSpan toWait = timerTask.executionTime - Clock.now(); |
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353 if( toWait.interval() > 0 ){ |
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354 cond.wait( toWait.interval() ); |
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355 } |
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356 else{ |
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357 schedules.removeHead(); |
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358 isReady = true; |
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359 } |
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360 } |
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361 }while( !isReady ); |
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362 } |
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363 if( timerTask ){ |
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364 timerTask.run(); |
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365 if( timerTask.period.millis > 0 ){ |
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366 timerTask.executionTime += timerTask.period; |
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367 synchronized(mutex){ |
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368 int index = 0; |
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369 foreach( tt; schedules ){ |
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370 if( tt.executionTime > timerTask.executionTime ){ |
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371 break; |
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372 } |
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373 index++; |
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374 } |
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375 schedules.addAt( index, timerTask ); |
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376 } |
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377 } |
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378 } |
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379 } |
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380 } |
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381 void cancel(){ |
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382 synchronized(mutex){ |
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383 isCanceled = true; |
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384 cond.notifyAll(); |
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385 } |
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386 } |
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387 void schedule(TimerTask task, long delay){ |
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388 scheduleAtFixedRate( task, delay, 0 ); |
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389 } |
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390 void scheduleAtFixedRate(TimerTask task, long delay, long period){ |
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391 assert( task ); |
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392 version(TANGOSVN){ |
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393 task.executionTime = Clock.now + TimeSpan.fromMillis(delay); |
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394 } else { |
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395 task.executionTime = Clock.now + TimeSpan.millis(delay); |
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396 } |
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397 task.timer = this; |
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398 synchronized(mutex){ |
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399 int index = 0; |
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400 if( schedules.size() > 0 ) |
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401 foreach( tt; schedules ){ |
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402 if( tt.executionTime > task.executionTime ){ |
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403 break; |
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404 } |
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405 index++; |
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406 } |
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407 schedules.addAt( index, task ); |
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408 cond.notifyAll(); |
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409 } |
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410 } |
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411 |
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412 // void schedule(TimerTask task, Date time){} |
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413 // void schedule(TimerTask task, Date firstTime, long period){} |
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414 // void schedule(TimerTask task, long delay, long period){} |
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415 // void scheduleAtFixedRate(TimerTask task, Date firstTime, long period){} |
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416 +/ |
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417 } |
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418 |
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419 |