func (cdbm *LruCdbm) MakeSpace(objectSize, sizeLimit int, f CacheCleanFunc) (base.CacheDirectoryBlock, error) {
if sizeLimit < objectSize {
return nil, ObjectTooBig
}
//there is nothing
if len(cdbm.Hash) == 0 {
return nil, nil
}
var repl base.CacheDirectoryBlock
for avail := sizeLimit - cdbm.Size; objectSize > avail; avail = sizeLimit - cdbm.Size {
lru := cdbm.cdbs.Front()
if lru == nil {
panic("cdbs is empty with nonzero size")
}
repl = cdbm.cdbs.Remove(lru).(base.CacheDirectoryBlock)
evObject := repl.GetObject()
cdbm.Size -= evObject.Size()
if f != nil && evObject != nil {
f(evObject)
}
delete(cdbm.Hash, repl.GetKey())
}
return repl, nil
}
func (cdbm *ArcCdbm) evict(f CacheCleanFunc) {
var cdb base.CacheDirectoryBlock
if cdbm.t1.size >= max(1, cdbm.target_t1) {
cdb = cdbm.t1.RemoveLRU()
acdb := cdb.(*ArcCdb)
acdb.where = in_b1
acdb.element = cdbm.b1.PushBack(acdb)
} else {
cdb = cdbm.t2.RemoveLRU()
acdb := cdb.(*ArcCdb)
acdb.where = in_b2
acdb.element = cdbm.b2.PushBack(acdb)
}
object := cdb.GetObject()
cdbm.Size -= object.Size()
if f != nil {
f(object)
}
cdb.SetObject(nil)
return
}
func (cdbm *ArcCdbm) MakeSpace(objectSize, sizeLimit int, f CacheCleanFunc) (base.CacheDirectoryBlock, error) {
if sizeLimit < objectSize {
return nil, ObjectTooBig
}
var cdb base.CacheDirectoryBlock
for avail := sizeLimit - cdbm.Size; objectSize > avail; avail = sizeLimit - cdbm.Size {
if cdbm.t1.size+cdbm.b1.size+objectSize >= sizeLimit {
if cdbm.b1.size > 0 {
cdb = cdbm.b1.RemoveLRU()
cdbm.evict(f)
} else {
cdb = cdbm.t1.RemoveLRU()
object := cdb.GetObject()
cdbm.Size -= object.Size()
if f != nil {
f(object)
}
}
delete(cdbm.Hash, cdb.GetKey())
} else if cdbm.t1.size+cdbm.t2.size+cdbm.b1.size+cdbm.b2.size+objectSize >= sizeLimit {
if cdbm.t1.size+cdbm.t2.size+cdbm.b1.size+cdbm.b2.size+objectSize >= sizeLimit*2 {
cdb = cdbm.b2.RemoveLRU()
delete(cdbm.Hash, cdb.GetKey())
} else {
cdb = newCacheDirectorBlock()
}
cdbm.evict(f)
} else {
cdb = newCacheDirectorBlock()
}
}
if cdb == nil {
cdb = newCacheDirectorBlock()
}
return cdb, nil
}
