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1 """each node descends from this base class"""
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2
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3 class NodeType:
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4 def __init__(self):
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5 """TBD"""
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6 self.ops = Ops()
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7
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8 ''' maybe
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9 self.iports = []
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10 self.oports = []
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11 self.params = []
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12 '''
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13 def get_state(self, stateaccess):
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14 """This is similar to the pickle.__getstate__ method, except
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15 we need this alternate version in order to give the node
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16 (which holds no state) access to its instance's state.
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17
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18 If your node keeps some transient items in its state dict
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19 (such as a buffer of recently received inputs), it may want to
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20 return a copy of the state dict without those items. set_state
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21 should restore them properly (if they're missing from the
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22 current state, which they might not be).
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23
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24 get_state might be called at any time, and it's certainly not
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25 guaranteed that the node instance is going out of service.
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26 get_state might get called to checkpoint the nodes for a
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27 backup, for example. set_state might also get called anytime.
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28 """
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29 return stateaccess
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30 def set_state(self, stateaccess, dict):
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31 """dict (named after the pickle.__setstate__ argument) is
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32 always a value that was previously returned from
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33 get_state. Don't adjust the current nodetype's state, of course;
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34 use dict to update stateaccess. If there were elements
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35 missing from dict (see the note in get_state for why this
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36 might be the case), you should restore them here as
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37 appropriate.
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38 """
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39 stateaccess.update(dict)
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40 def get_default_params(self):
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41 '''Returns dictionary of param names and DataType instances. DataTypes
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42 can be given values'''
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43 return {}
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44 def get_default_ports(self):
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45 '''Returns pinless port objects'''
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46 return {}
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