Source Code for Module haizea.pluggable.policies.admission

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 2  # Copyright 2006-2009, University of Chicago                                 # 
 3  # Copyright 2008-2009, Distributed Systems Architecture Group, Universidad   # 
 4  # Complutense de Madrid (dsa-research.org)                                   # 
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18   
19  """This module provides pluggable lease admission policies. See the documentation 
20  for haizea.core.schedule.policy.LeaseAdmissionPolicy for more details on 
21  lease admission policies. 
22  """ 
23   
24   
25  from haizea.core.scheduler.policy import LeaseAdmissionPolicy 
26  from haizea.core.leases import Lease 
27   
28 -class AcceptAllPolicy(LeaseAdmissionPolicy): 
29      """A simple admission policy: all lease requests are accepted. 
30      """ 
31 -    def __init__(self, slottable): 
32          """Constructor 
33           
34          Argument 
35          slottable -- A fully constructed SlotTable 
36          """   
37          LeaseAdmissionPolicy.__init__(self, slottable) 
38           
39 -    def accept_lease(self, lease): 
40          """Lease admission function 
41           
42          See class documentation for details on what policy is implemented here. 
43          Returns True if the lease can be accepted, False if it should be rejected. 
44           
45          Argument 
46          lease -- Lease request 
47          """            
48          return True   
49       
50 -class NoARsPolicy(LeaseAdmissionPolicy): 
51      """A simple admission policy: all lease requests, except AR requests, 
52      are accepted. 
53      """ 
54       
55 -    def __init__(self, slottable): 
56          """Constructor 
57           
58          Argument 
59          slottable -- A fully constructed SlotTable 
60          """   
61          LeaseAdmissionPolicy.__init__(self, slottable) 
62           
63 -    def accept_lease(self, lease): 
64          """Lease admission function 
65           
66          See class documentation for details on what policy is implemented here. 
67          Returns True if the lease can be accepted, False if it should be rejected. 
68           
69          Argument 
70          lease -- Lease request 
71          """         
72          return lease.get_type() != Lease.ADVANCE_RESERVATION 
73