Serge NOEL
64 lines
2.6 KiB
Python
64 lines
2.6 KiB
Python
# Make a master sensor follow a set of follower sensor
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# *) Changes to the known state of the followers map to the known state of the master,
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# following the rules (first applied wins)
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# Any UNKNOWN -> UNKNOWN
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# Any INCONSISTENT -> INCONSISTENT
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# Any ACTIVE -> ACTIVE
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# All INACTIVE -> INACTIVE
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# Otherwise, INCONSISTENT
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# *) changes to the known state of the master does nothing
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#
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# This is hard to do properly in Logix due to limited access to states
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# and events (can't tell which change happened due to what)
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#
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# Author: Bob Jacobsen, copyright 2017
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# Part of the JMRI distribution
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import jmri
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import java
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import java.beans
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# Define the listener.
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class CombineSensors(java.beans.PropertyChangeListener):
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def set(self, masterName, followerList) :
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self.master = sensors.getSensor(masterName)
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self.followers = followerList
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# force event to set the initial state
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self.propertyChange(java.beans.PropertyChangeEvent(sensors.getSensor(followerList[0]), "KnownState", 0, 0))
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# set up listeners
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self.master.addPropertyChangeListener(self)
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for follower in self.followers :
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sensors.getSensor(follower).addPropertyChangeListener(self)
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return
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def propertyChange(self, event):
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# print "Receive change of", event.propertyName, "from", self.master.describeState(event.oldValue), "to", self.master.describeState(event.newValue), "in", event.source.userName
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if (event.source != self.master and event.propertyName == "KnownState" ):
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# do the KnownState rules
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for follower in self.followers :
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if (sensors.getSensor(follower).getKnownState() == UNKNOWN) :
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self.master.setKnownState(UNKNOWN)
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return
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for follower in self.followers :
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if (sensors.getSensor(follower).getKnownState() == INCONSISTENT) :
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self.master.setKnownState(INCONSISTENT)
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return
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for follower in self.followers :
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if (sensors.getSensor(follower).getKnownState() == ACTIVE) :
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self.master.setKnownState(ACTIVE)
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return
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inactive = True
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for follower in self.followers :
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if (sensors.getSensor(follower).getKnownState() != INACTIVE) :
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inactive = False
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if (inactive) :
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self.master.setKnownState(INACTIVE)
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return
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self.master.setKnownState(INCONSISTENT)
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return
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# Example of use - add lines like the following
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# that includes system or user names for the master sensor and
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# the array of followers. These must already exist.
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# CombineSensors().set("IS100",["IS101", "IS102"])
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