python.LumiDBCache.LumiDBCache Class Reference

Collaboration diagram for python.LumiDBCache.LumiDBCache:

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

Public Attributes
	reader
	validStartTime
	validEndTime
	payload

Detailed Description

Definition at line 17 of file LumiDBCache.py.

Constructor & Destructor Documentation

__init__()

def 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()

def 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()

def 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()

def 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()

def 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

Definition at line 28 of file LumiDBCache.py.

reader

python.LumiDBCache.LumiDBCache.reader

Definition at line 21 of file LumiDBCache.py.

validEndTime

python.LumiDBCache.LumiDBCache.validEndTime

Definition at line 27 of file LumiDBCache.py.

validStartTime

python.LumiDBCache.LumiDBCache.validStartTime

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