def __init__(self, nSize=10, sProject=""):
try:
from Tools.Database import Database
self.DB=Database(sProject)
except:
self.DB=None
self.nSize = nSize
# lCache contains pointers to the objects, and is used to implement
# a last recently used strategy
# dcache is used to find the information quickly.
self.lCache = []
self.dCache = {}
class Cache:
def __init__(self, nSize=10, sProject=""):
try:
from Tools.Database import Database
self.DB=Database(sProject)
except:
self.DB=None
self.nSize = nSize
# lCache contains pointers to the objects, and is used to implement
# a last recently used strategy
# dcache is used to find the information quickly.
self.lCache = []
self.dCache = {}
# --------------------------------------------------------------------------
def DeleteFile(self, oFile):
if self.dCache.get(oFile.sGetFilename(), None) == None: return
for i in range(len(self.lCache)):
if self.lCache[i]==oFile:
print "Deleting '%s' from cache"%oFile.sGetFilename()
del self.lCache[i]
del self.dCache[oFile.sGetFilename()]
return
# --------------------------------------------------------------------------
def Store(self, oFile, bNoDBUpdate=0):
sFilename = oFile.sGetFilename()
nCount = 0
oldObj = self.dCache.get(sFilename, None)
if oldObj:
for i in self.lCache:
if i == oldObj:
self.lCache[nCount ] = oFile
self.dCache[sFilename] = oFile
break
nCount=nCount + 1
else:
# Otherwise put the file into the cache list
while len(self.lCache)>=self.nSize:
print len(self.lCache), self.nSize
nOldLen = len(self.lCache)
self.DeleteFile(self.lCache[-1])
if nOldLen==len(self.lCache):
print "Deadloch, last entry not removed",nOldLen,len(self.lCache)
print "lCache:"
for i in self.lCache:
print i.sGetFilename()
print "dCache:"
for i,j in self.dCache.items():
print i,j.sGetFilename()
import sys
sys.exit(-1)
self.dCache[sFilename]=oFile
self.lCache = [oFile] + self.lCache
# Now remove a previously existing copy from the datbase backend
if not bNoDBUpdate and self.DB:
self.DB.AddFile(oFile)
# --------------------------------------------------------------------------
def oGetFile(self, sIdentifier, sType):
# First check the cache
if sType=="file":
oFile = self.dCache.get(sIdentifier, None)
if oFile!=None:
print "Returning %s from cache, moving to front of list"%sIdentifier
# Well, some overhead here, but easy to implement :)
self.DeleteFile(oFile)
self.Store(oFile, bNoDBUpdate=1)
return self.lCache[n]
else:
for oFile in self.lCache:
o = oFile.GetIdentifier(sIdentifier, sType)
if o:
print "Returning '%s' of type '%s' from cache, moving to front of list"%\
(sIdentifier, sType)
self.DeleteFile(oFile)
self.Store(oFile, bNoDBUpdate=1)
return o
# Now try to get the object from the database backend
if self.DB:
oFile = self.DB.oGetFile(sIdentifier, sType)
if self.DB and oFile:
if sType=="file":
o = oFile
else:
o = oFile.GetIdentifier(sIdentifier, sType)
print "Returning '%s' from database, storing in cache"%sIdentifier
self.DeleteFile(oFile)
self.Store(oFile, bNoDBUpdate=1)
return o
return None
