python.LumiDBCache.LumiDBCache Class Reference

Collaboration diagram for python.LumiDBCache.LumiDBCache:

Public Member Functions
	__init__ (self, dbstr=None, folderstr=None)
	clearValidity (self)
	setValidity (self, obj)
	isValid (self, time)
	getPayload (self, time)

Public Attributes
	reader = CoolDataReader(dbstr, folderstr)
	validStartTime = cool.ValidityKeyMax
	validEndTime = cool.ValidityKeyMin
	payload = None

Detailed Description

Definition at line 17 of file LumiDBCache.py.

Constructor & Destructor Documentation

__init__()

python.LumiDBCache.LumiDBCache.__init__	(		self,
			dbstr = None,
			folderstr = None )

Definition at line 19 of file LumiDBCache.py.

    def __init__(self, dbstr=None, folderstr=None):
 
        self.reader = CoolDataReader(dbstr, folderstr)
        self.clearValidity()
 

Member Function Documentation

clearValidity()

python.LumiDBCache.LumiDBCache.clearValidity

(

self

)

Definition at line 24 of file LumiDBCache.py.

    def clearValidity(self):
 
        self.validStartTime = cool.ValidityKeyMax
        self.validEndTime = cool.ValidityKeyMin
        self.payload = None
 

getPayload()

python.LumiDBCache.LumiDBCache.getPayload	(		self,
			time )

Definition at line 38 of file LumiDBCache.py.

    def getPayload(self, time):
 
        # Is existing version valid?
        if self.isValid(time):
            return self.payload
 
        # Nope, invalidate cache
        self.clearValidity()
        
        # Check if we already have the pre-fetched in the reader
        for obj in self.reader.data:
            if not obj.since() <= time < obj.until(): continue
            self.setValidity(obj)
 
        # Did we find it?
        if self.isValid(time):
            return self.payload
 
        # Guess not, try reading directly from DB
        self.reader.setIOVRange(time, time)
        self.reader.readData()
 
        # Try once more to find the object
        for obj in self.reader.data:
            if not obj.since() <= time < obj.until(): continue
            self.setValidity(obj)
 
        # Did we find it?
        if self.isValid(time):
            return self.payload
 
        return None
    

isValid()

python.LumiDBCache.LumiDBCache.isValid	(		self,
			time )

Definition at line 35 of file LumiDBCache.py.

    def isValid(self, time):
        return (self.validStartTime <= time < self.validEndTime)
 

setValidity()

python.LumiDBCache.LumiDBCache.setValidity	(		self,
			obj )

Definition at line 30 of file LumiDBCache.py.

    def setValidity(self, obj):
        self.validStartTime = obj.since()
        self.validEndTime = obj.until()
        self.payload = obj.payload()
        

Member Data Documentation

payload

python.LumiDBCache.LumiDBCache.payload = None

Definition at line 28 of file LumiDBCache.py.

reader

python.LumiDBCache.LumiDBCache.reader = CoolDataReader(dbstr, folderstr)

Definition at line 21 of file LumiDBCache.py.

validEndTime

python.LumiDBCache.LumiDBCache.validEndTime = cool.ValidityKeyMin

Definition at line 27 of file LumiDBCache.py.

validStartTime

python.LumiDBCache.LumiDBCache.validStartTime = cool.ValidityKeyMax

Definition at line 26 of file LumiDBCache.py.

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The documentation for this class was generated from the following file:

• LumiDBCache.py