Ejemplo n.º 1
0
        private void StoreObject0(IPersistent obj)
        {
            obj.OnStore();
            int oid = obj.Oid;
            bool newObject = false;
            if (oid == 0)
            {
                oid = AllocateId();
                if (!obj.Deleted)
                {
                    objectCache.Put(oid, obj);
                }
                obj.AssignOid(this, oid, false);
                newObject = true;
            }
            else if (obj.Modified)
            {
                objectCache.ClearDirty(oid);
            }
            byte[] data = PackObject(obj);
            long pos;
            int newSize = ObjectHeader.GetSize(data, 0);
            if (newObject || (pos = GetPos(oid)) == 0)
            {
                pos = Allocate(newSize, 0);
                SetPos(oid, pos | dbModifiedFlag);
            }
            else
            {
                int offs = (int) pos & (Page.pageSize - 1);
                if ((offs & (dbFreeHandleFlag | dbPageObjectFlag)) != 0)
                {
                    throw new StorageError(StorageError.DELETED_OBJECT);
                }

                Page pg = pool.GetPage(pos - offs);
                offs &= ~ dbFlagsMask;
                int size = ObjectHeader.GetSize(pg.data, offs);
                pool.Unfix(pg);
                if ((pos & dbModifiedFlag) == 0)
                {
                    CloneBitmap(pos & ~ dbFlagsMask, size);
                    pos = Allocate(newSize, 0);
                    SetPos(oid, pos | dbModifiedFlag);
                }
                else
                {
                    if (((newSize + dbAllocationQuantum - 1) & ~ (dbAllocationQuantum - 1)) > ((size + dbAllocationQuantum - 1) & ~ (dbAllocationQuantum - 1)))
                    {
                        long newPos = Allocate(newSize, 0);
                        CloneBitmap(pos & ~ dbFlagsMask, size);
                        Free(pos & ~ dbFlagsMask, size);
                        pos = newPos;
                        SetPos(oid, pos | dbModifiedFlag);
                    }
                    else if (newSize < size)
                    {
                        ObjectHeader.SetSize(data, 0, size);
                    }
                }
            }
            modified = true;
            pool.Put(pos & ~ dbFlagsMask, data, newSize);
        }