script/StateCAS.py

@@ -0,0 +1,50 @@
+class EpicsServerState(ReadonlyAsyncRegisterBase):
+    def __init__(self, name, channel, as_string=True):
+        RegisterBase.__init__(self, name)
+        self.channel=channel
+        self.as_string=as_string
+        self.val = "Unknown"
+        self.cas = None
+        self.state_change_listener=None        
+        
+    def doInitialize(self):   
+        super(EpicsServerState, self).doInitialize()
+        if self.as_string:
+            self.cas = CAS(self.channel, self, 'string')
+        else:
+            self.cas = CAS(self.channel, self, 'byte')
+        if self.state_change_listener is None:
+            class StateChangeListener(ContextListener):
+                def onContextStateChanged(_self, state, former):  
+                    self.set(state)        
+            self.state_change_listener = StateChangeListener()   
+            get_context().addListener(self.state_change_listener)
+                     
+    def getSize(self):
+        if self.as_string:
+            return 1            
+        else:
+            return 100
+                        
+    def doClose(self):
+        if self.state_change_listener:
+            get_context().removeListener(self.state_change_listener)
+        if self.cas:
+            self.cas.close()
+            self.cas = None
+        super(EpicsServerState, self).doClose()        
+
+    def set(self, value):
+        if self.as_string:
+            self.onReadout(str(value)) 
+        else:
+            self.onReadout(string_to_list(str(value)))
+        
+    
+
+
+
+if "server_state_channel" in globals():
+    server_state_channel.close()
+server_state_channel = EpicsServerState("server_state_channel", "PSHELL_OP:STATE", False)
+server_state_channel.initialize()