twisted.spread 中pb.setUnjellyableForClass怎么用

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部分代码zenoss-api_2.5.0\api\Products.ZenStatus.zenstatus-module.html

1. import sys
   
2. import os
   
3. import time
   
4. import socket
   
5. import ip
   
6. import icmp
   
7. import errno
   
8. import logging
   
9. log = logging.getLogger("zen.Ping")
   
10. 
    
11. from twisted.internet import reactor, defer
    
12. from twisted.spread import pb
    
13. 
    
14. class PermissionError(Exception):
    
15.     """Not permitted to access resource."""
    
16. 
    
17. class IpConflict(Exception):
    
18.     """Pinging two jobs simultaneously with different hostnames but the same IP"""
    
19. 
    
20. class PingJob(pb.Copyable, pb.RemoteCopy):
    
21.     """
    
22.     Class representing a single target to be pinged.
    
23.     """
    
24.     def __init__(self, ipaddr, hostname="", status=0, unused_cycle=60):
    
25.         self.parent = False
    
26.         self.ipaddr = ipaddr
    
27.         self.hostname = hostname
    
28.         self.status = status
    
29.         self.reset()
    
30. 
    
31. 
    
32.     def reset(self):
    
33.         self.deferred = defer.Deferred()
    
34.         self.rrt = 0
    
35.         self.start = 0
    
36.         self.sent = 0
    
37.         self.message = ""
    
38.         self.severity = 5
    
39.         self.inprocess = False
    
40.         self.pathcheck = 0
    
41.         self.eventState = 0
    
42. 
    
43. 
    
44.     def checkpath(self):
    
45.         if self.parent:
    
46.             return self.parent.checkpath()   
    
47. 
    
48.     def routerpj(self):
    
49.         if self.parent:
    
50.             return self.parent.routerpj()
    
51. 
    
52. pb.setUnjellyableForClass(PingJob, PingJob)

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from twisted.spread import pb
pb.setUnjellyableForClass(PingJob, PingJob)



setUnjellyableForClass是什么意识，什么作用啊，看英文不大懂

1. def setUnjellyableForClass(classname, unjellyable):
   
2.     """
   
3.     Set which local class will represent a remote type.
   
4. 
   
5.     If you have written a Copyable class that you expect your client to be
   
6.     receiving, write a local "copy" class to represent it, then call::
   
7. 
   
8.         jellier.setUnjellyableForClass('module.package.Class', MyCopier).
   
9. 
   
10.     Call this at the module level immediately after its class
    
11.     definition. MyCopier should be a subclass of RemoteCopy.
    
12. 
    
13.     The classname may be a special tag returned by
    
14.     'Copyable.getTypeToCopyFor' rather than an actual classname.
    
15. 
    
16.     This call is also for cached classes, since there will be no
    
17.     overlap.  The rules are the same.
    
18.     """
    
19. 
    
20.     global unjellyableRegistry
    
21.     classname = _maybeClass(classname)
    
22.     unjellyableRegistry[classname] = unjellyable
    
23.     globalSecurity.allowTypes(classname)
    

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