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persist.py
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persist.py
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#!/usr/bin/env python
import unittest
import shelve
import sys
import os
from pymud.coroutine import coroutine,step,finish
from pymud.formatter import ColorTextFormatter
def getP(o):
if o.id in P.instances:
return P.instances[o.id]
else:
p = P(o)
P.instances[o.id] = p
return p
class P(object):
"""P is a persistent reference to a persistent object.
To create a new persistent reference use:
>>> x = persist.P(o).
To retrieve the object from the persistent reference above use:
>>> x()
"""
persist = None
instances = {}
__slots__ = ['id','ref']
def __init__(self,o=None):
if not o:
self.id = None
self.ref = None
elif isinstance(o,P):
self.id = o.id
self.ref = o()
else:
self.id = o.id
self.ref = o
P.instances[self.id] = self
def __call__(self):
if self.ref and not hasattr(self.ref,'deleted'):
return self.ref
if self.ref and not self.ref.deleted:
return self.ref
if self.ref and self.ref.deleted:
return None
if not self.id: return None
try:
self.ref = P.persist.get(self.id)
return self.ref
except KeyError,e:
return None
def __eq__(self,other):
return self.id == other.id
def __nonzero__(self):
return self() != None
def delete(self):
del P.instances[self.id]
P.persist.delete(self)
self.id = None
self.ref = None
def __setstate__(self,state):
self.id = state['id']
self.ref = None
def __getstate__(self):
state = {}
state['id'] = self.id
return state
def __str__(self):
return "P" + str(self())
def __repr__(self):
return "P" + repr(self())
P.null = P()
class Persistence(object):
def __init__(self,filename):
self.db = shelve.open(filename,protocol=2,writeback=True)
self.writeBackIterator = None
if '0' in self.db:
self.id = self.db['0']
else:
self.id = 0
self.db['0'] = self.id
def getNextId(self):
self.id += 1
self.db['0'] = self.id
return self.id
def persist(self,o):
if not o.id:
o.id = "%x" % self.getNextId()
self.db[o.id] = o
return o
def get(self,id):
return self.db[id]
def getOrCreate(self,id,klass,*args,**kwargs):
if self.exists(id):
return self.get(id)
else:
instance = klass(id=id,*args,**kwargs)
instance.id = id
self.persist(instance)
return instance
def exists(self,id):
try:
self.db[id]
return True
except KeyError, e:
return False
def delete(self,o):
if o.id in self.db:
self.db[o.id].deleted = True
del self.db[o.id]
def sync(self,n=1):
if not self.writeBackIterator:
self.writeBackIterator = self.partialSync()
if not step(self.writeBackIterator,n):
self.writeBackIterator = None
return True
return False
def syncAll(self):
if not self.writeBackIterator:
self.writeBackIterator = self.partialSync()
finish(self.writeBackIterator)
self.db.dict.sync()
@coroutine
def partialSync(self):
db = self.db
for key, entry in db.cache.copy().iteritems():
yield
db.writeback = False
#print "Persisting %s" % key
db[key] = entry
db.writeback = True
def run(self,n=1):
self.sync(n)
def close(self):
self.db.close()
class MockPersistence(Persistence):
def __init__(self):
self.db = {}
if '0' in self.db:
self.id = self.db['0']
else:
self.id = 0
self.db['0'] = self.id
def sync(self,n=1):
pass
def syncAll(self):
pass
@coroutine
def partialSync(self):
yield
def close(self):
self.db = None
self.id = None
class Persistent(object):
def __init__(self):
self.id = None
self.deleted = False
class StdoutReceiver(ColorTextFormatter):
def __init__(self):
self.id = None
def receiveMessage(self,message):
sys.stdout.write("\n")
sys.stdout.write(self.formatMessage(message))
sys.stdout.write("\n")
sys.stdout.flush()
class TestShelve(unittest.TestCase):
def setUp(self):
if os.path.exists("test.db"): os.remove("test.db")
if os.path.exists("test.db.db"): os.remove("test.db.db")
def testSimple(self):
s = shelve.open("test.db",protocol=2)
s['a'] = 1
s.close()
s = shelve.open("test.db",protocol=2)
self.assertEquals(s['a'],1)
s.close()
def test(self):
import mob
m = mob.Mob()
m.applyCommand("say",["hi"])
def testMob(self):
import mob
s = shelve.open("test.db",protocol=2)
m = mob.Mob()
m.addListener(StdoutReceiver())
print m.listeners
m.applyCommand("say",["hi"])
s['a'] = m
s.close()
s = shelve.open("test.db",protocol=2)
m = s['a']
m.addListener(StdoutReceiver())
m.applyCommand("say",["hi"])
self.assert_(s['a'])
s.close()
class TestPersistence(unittest.TestCase):
def setUp(self):
if os.path.exists("test.db"): os.remove("test.db")
if os.path.exists("test.db.db"): os.remove("test.db.db")
P.persist = None
self.id = None
def testMob(self):
import mob
P.persist = Persistence("test.db")
self.assertEquals(P.persist.id,0)
m = mob.Mob()
m.addListener(StdoutReceiver())
m.applyCommand("say",["hi"])
P.persist.persist(m)
P.persist.close()
P.persist = Persistence("test.db")
self.assertEquals(P.persist.id,1)
m = P.persist.get('1')
m.addListener(StdoutReceiver())
m.applyCommand("say",["hi"])
P.persist.close()
def testSync(self):
import mob
P.persist = Persistence("test.db")
self.assertEquals(P.persist.id,0)
for x in xrange(100):
m = mob.Mob()
m.addListener(StdoutReceiver())
m.applyCommand("say",["hi"])
P.persist.persist(m)
for x in xrange(10):
print P.persist.sync()
P.persist.close()
P.persist = Persistence("test.db")
self.assertEquals(P.persist.id,100)
m = P.persist.get('1')
m.addListener(StdoutReceiver())
m.applyCommand("say",["hi"])
P.persist.sync()
P.persist.close()
def testSyncDelete(self):
import mob
P.persist = Persistence("test.db")
self.assertEquals(P.persist.id,0)
for x in xrange(100):
m = mob.Mob()
m.addListener(StdoutReceiver())
m.applyCommand("say",["hi"])
P.persist.persist(m)
P.persist.sync()
P.persist.delete(m)
for x in xrange(10):
print P.persist.sync()
P.persist.close()
def testGetOrCreate(self):
import mob
P.persist = Persistence("test.db")
x = P.persist.getOrCreate("mob",mob.Mob)
x.nameAttribute = "bob"
P.persist.close()
P.persist = Persistence("test.db")
x = P.persist.getOrCreate("mob",mob.Mob)
y = P.persist.getOrCreate("notmob",mob.Mob)
self.assertEquals(x.nameAttribute,"bob")
self.assertRaises(AttributeError,lambda: y.nameAttribute)
P.persist.close()
class TestP(unittest.TestCase):
def setUp(self):
if os.path.exists("test.db"): os.remove("test.db")
if os.path.exists("test.db.db"): os.remove("test.db.db")
P.persist = None
def testTemporary(self):
import mob
import sys
m = P(mob.Mob())
self.assert_(m())
self.assertFalse(m().id)
m().run(0)
m().addListener(StdoutReceiver())
m().applyCommand("say",['testTemporary'])
m.ref = None
self.assertFalse(m())
def testPersistent(self):
import mob
import sys
P.persist = Persistence("test.db")
m = P(P.persist.persist(mob.Mob()))
self.assert_(m())
self.assert_(m.id)
self.assert_(m.ref)
self.assertEquals(m().__class__,mob.Mob)
self.assert_(m().id)
print m()
m().run(0)
m().addListener(StdoutReceiver())
m().applyCommand("say",['testPersistent'])
m.ref = None
self.assert_(m())
self.assert_(m.id)
self.assert_(m.ref)
self.assertEquals(m().__class__,mob.Mob)
self.assert_(m().id)
print m()
m().run(0)
m().applyCommand("say",['testPersistent'])
P.persist.close()
m.ref = None
P.persist = Persistence("test.db")
self.assert_(m())
self.assert_(m.id)
self.assert_(m.ref)
self.assertEquals(m().__class__,mob.Mob)
self.assert_(m().id)
m().addListener(StdoutReceiver())
m().run(0)
m().applyCommand("say",['testPersistent'])
def testDeletedPersistent(self):
import mob
import sys
P.persist = Persistence("test.db")
m = P(P.persist.persist(mob.Mob()))
m().run(0)
P.persist.delete(m)
self.assertTrue(m.ref.deleted)
self.assertFalse(m())
m.ref = None
P.persist.close()
P.persist = Persistence("test.db")
self.assertFalse(m())
def testDelete(self):
import mob
import sys
P.persist = Persistence("test.db")
m = P(P.persist.persist(mob.Mob()))
m().run(0)
m.delete()
self.assertFalse(m())
m.delete()
self.assertFalse(m())
P.persist.close()
P.persist = Persistence("test.db")
self.assertFalse(m())
def testPersistentChain(self):
import mob
import sys
P.persist = Persistence("test.db")
m = P(P.persist.persist(mob.Mob()))
m2 = P(m)
self.assert_(m.ref is m2.ref)
def testEquality(self):
self.p1 = P()
self.p1.id = 5
self.p1.ref = 9908
self.p2 = P()
self.p2.id = 5
self.p1.ref = 4353
self.assertEqual(self.p1,self.p2)
self.assertFalse(self.p1 is self.p2)
def testList(self):
self.testEquality()
l = [self.p2]
self.assert_(self.p1 in l)
self.assert_(self.p2 in l)
l.remove(self.p1)
self.assertFalse(l)
def testSame(self):
import mob
import sys
P.persist = Persistence("test.db")
m = P.persist.persist(mob.Mob())
p1 = getP(m)
p2 = getP(m)
self.assertEquals(p1,p2)
self.assert_(p1 is p2)
class TestMockPersistence(unittest.TestCase):
def setUp(self):
P.persist = None
def testSame(self):
import mob
import sys
P.persist = MockPersistence()
m = P.persist.persist(mob.Mob())
p1 = getP(m)
p2 = getP(m)
self.assertEquals(p1,p2)
self.assert_(p1 is p2)
if __name__ == "__main__":
unittest.main()