126 lines
3.7 KiB
Python
126 lines
3.7 KiB
Python
import sys, mutex, thread
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import sgpem
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## @brief This is an adapter class which acts as a proxy
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# for user-implemented policies
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#
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# At runtime, this class will be initialized with the
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# user-implemented policy, and then it will proxy the calls
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# the policy member functions on a different thread, so
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# to ensure asyncronous control.
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#
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# Instantiated in the C++ code, it is created like:
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# @code
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# adapter = ScriptAdapter(UserPolicyClass)
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# @endcode
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#
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# The user shouldn't care about this class at all.
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class ScriptAdapter :
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## @var The policy this ScriptAdapter will use for calls
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_policy = None
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## @var Synchronized return value you can read from C++
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# when a threaded function returns
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_ret_val = None
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## Var Testable syncronization object
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_g_mutex = mutex.mutex()
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_g_last_exception = None
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## @brief Constructor of ScriptAdapter
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#
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# @param self The caller object
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# @param policy A user-implemented class inheriting from Policy.Policy
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def __init__(self, policy):
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self._policy = policy()
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print 'ScriptAdapter for policy ', policy, ' loaded'
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## @brief Asynchronously call Policy.configure()
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#
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# @param self The caller object
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def async_configure(self):
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self._g_last_exception = None
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self._g_mutex.lock(ScriptAdapter._wrap_configure, self )
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def _wrap_configure(self):
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thread.start_new_thread(ScriptAdapter._wrap_configure_callback, (self,))
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def _wrap_configure_callback(self):
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# call configure method
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try:
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self._policy.configure()
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except:
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self._g_last_exception = sys.exc_value
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self._g_mutex.unlock()
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## @brief Asynchronously call Policy.sort_queue()
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#
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# The queue is asked directly to the C++ sgpem::Scheduler
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# singleton, via SWIG
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#
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# @param self The caller object
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def async_sort_queue(self):
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self._g_last_exception = None
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self._g_mutex.lock(ScriptAdapter._wrap_sort_queue, self)
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def _wrap_sort_queue(self):
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thread.start_new_thread(ScriptAdapter._wrap_sort_queue_callback, (self,))
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def _wrap_sort_queue_callback(self):
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# here we retrieve and pass the ready queue
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queue = sgpem.Scheduler.get_instance().get_ready_queue()
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try:
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self._policy.sort_queue(queue)
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except:
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self._g_last_exception = sys.exc_value
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self._g_mutex.unlock()
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## @brief Asynchronously call Policy.is_preemptive()
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#
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# @param self The caller object
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def async_is_preemptive(self):
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self._g_last_exception = None
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self._g_mutex.lock(ScriptAdapter._wrap_is_preemptive, self)
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def _wrap_is_preemptive(self):
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thread.start_new_thread(ScriptAdapter._wrap_is_preemptive_callback, (self,))
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def _wrap_is_preemptive_callback(self):
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try:
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self._ret_val = self._policy.is_preemptive()
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except:
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self._g_last_exception = sys.exc_value
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self._g_mutex.unlock()
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## @brief Asynchronously call Policy.get_time_slice()
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#
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# @param self The caller object
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def async_get_time_slice(self):
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self._g_last_exception = None
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self._g_mutex.lock(ScriptAdapter._wrap_get_time_slice, self)
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def _wrap_get_time_slice(self):
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thread.start_new_thread(ScriptAdapter._wrap_get_time_slice_callback, (self,))
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def _wrap_get_time_slice_callback(self):
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try:
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self._ret_val = self._policy.get_time_slice()
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except:
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self._g_last_exception = sys.exc_value
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self._g_mutex.unlock()
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## @brief Return the global shared variable with the methods' last return value
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def get_return_value(self):
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return self._ret_val
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def mutex_test_lock(self):
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return self._g_mutex.test()
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def get_last_exception(self):
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return self._g_last_exception
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