task.xml 5.9 KB

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  1. <class name="Task">
  2. <relationships>
  3. <association name="parent" class="MvKController" min="1" max="1"/>
  4. </relationships>
  5. <constructor>
  6. <parameter name="taskname"/>
  7. <parameter name="mvs_operations"/>
  8. <parameter name="mvk"/>
  9. <body>
  10. <![CDATA[
  11. self.taskname = taskname
  12. self.mvs_operations = mvs_operations
  13. self.mvk = mvk
  14. self.failed = False
  15. self.output_queue = []
  16. self.outputs = []
  17. self.do_yield = False
  18. ]]>
  19. </body>
  20. </constructor>
  21. <method name="execute_modelverse">
  22. <parameter name="taskname"/>
  23. <parameter name="operation"/>
  24. <parameter name="params"/>
  25. <body>
  26. <![CDATA[
  27. reply = None
  28. commands = []
  29. mvk = self.mvk
  30. mvs_operations = self.mvs_operations
  31. try:
  32. while 1:
  33. commands = mvk.execute_yields(taskname, operation, params, reply)
  34. if commands is None:
  35. break
  36. reply = [mvs_operations[command[0]](*(command[1])) for command in commands]
  37. except:
  38. import traceback
  39. print(traceback.format_exc())
  40. #TODO delete self, as the task has crashed!
  41. return False
  42. return True
  43. ]]>
  44. </body>
  45. </method>
  46. <scxml initial="start">
  47. <parallel id="start">
  48. <state id="execution" initial="running">
  49. <state id="running" initial="executing">
  50. <transition event="pause_task" target="../suspended"/>
  51. <state id="executing">
  52. <onentry>
  53. <script>
  54. start_time = time.time()
  55. # Grant each task some milliseconds of execution
  56. self.do_yield = False
  57. while (time.time() - start_time &lt; 0.05):
  58. if not self.execute_modelverse(self.taskname, "execute_rule", []):
  59. # Failed!
  60. self.failed = True
  61. break
  62. if not self.mvk.success:
  63. # Blocking or broken, so quit already to stop wasting CPU
  64. self.do_yield = True
  65. break
  66. if not self.failed:
  67. # Perform output if there is anything
  68. while self.output_queue:
  69. if self.execute_modelverse(self.taskname, "get_output", []):
  70. if self.mvk.success:
  71. self.outputs.append((self.output_queue.pop(0), self.mvk.returnvalue))
  72. else:
  73. # No output left in Mv, so break
  74. break
  75. else:
  76. self.failed = True
  77. break
  78. </script>
  79. </onentry>
  80. <transition cond="self.failed" target="../../failed"/>
  81. <transition after="self.sccd_yield()" target="."/>
  82. <transition cond="self.do_yield" target="../yielded"/>
  83. </state>
  84. <state id="yielded">
  85. <transition after="self.sccd_yield() + 1" target="../executing"/>
  86. <transition event="processed_input" target="../executing"/>
  87. <transition event="waiting_output" target="../executing"/>
  88. </state>
  89. </state>
  90. <state id="suspended">
  91. <state id="suspended">
  92. <transition event="resume" target="../../running"/>
  93. </state>
  94. </state>
  95. <state id="failed">
  96. <state id="failed">
  97. <!-- TODO delete task -->
  98. </state>
  99. </state>
  100. </state>
  101. <state id="process_events">
  102. <state id="process_events">
  103. <transition event="input" target=".">
  104. <parameter name="params"/>
  105. <script>
  106. for args_entry in params:
  107. if not self.execute_modelverse(self.taskname, "set_input", [args_entry]):
  108. # Failed!
  109. self.failed = True
  110. break
  111. </script>
  112. <raise event="processed_input"/>
  113. </transition>
  114. <transition event="output" target=".">
  115. <parameter name="params"/>
  116. <script>
  117. self.output_queue.append(params)
  118. </script>
  119. <raise event="waiting_output"/>
  120. </transition>
  121. <transition cond="self.outputs" target=".">
  122. <script>
  123. source, value = self.outputs.pop(0)
  124. </script>
  125. <raise event="HTTP_input" scope="narrow" target="'parent/to_mvi/%s' % source">
  126. <parameter expr="json.dumps(value)"/>
  127. </raise>
  128. </transition>
  129. </state>
  130. </state>
  131. </parallel>
  132. </scxml>
  133. </class>