class Table:
"""
:param name: string #Table name
:param num_columns: int #Number of Columns: all columns are integer
:param key: int #Index of table key in columns
"""
def __init__(self, name, num_columns, key):
self.name = name
self.key = key
self.num_columns = num_columns
self.page_directory = {
} # Replace with index, and all references inside table and query with index API
self.index = Index(self, self.num_columns)
self.buffer_pool_range = BufferPoolRange(BUFFER_POOL_SIZE_RANGE,
num_columns)
# self.page_ranges = []
# self.page_ranges.append(PageRange(self.num_columns))
self.curr_page_range = 0
self.insertRecord([0] * num_columns)
# Future function to merge tail records into base records
def __merge(self):
# create deep copy of page range
#for x offset in base page
pass
def __str__(self):
return self.name
def createIndex(self, column_num):
self.index.create_index(column_num)
def getIndex(self, column_num):
return self.index.getIndex(column_num)
def close(self):
self.buffer_pool_range.evictAll()
def getName(self):
return self.name
# Creates a new PageRange if needed, and appends it to page_ranges
def newPageRange(self):
# self.page_ranges.append(PageRange(self.num_columns))
# self.buffer_pool_range.
self.curr_page_range = self.curr_page_range + 1
# Helper function for the translation of RID value to RID components
def getOffset(self, rid):
return rid % (PAGE_SIZE // COL_DATA_SIZE)
# Helper function for the translation of RID value to RID components
def getPageR(self, rid):
return rid // ((BASE_CONST + TAIL_CONST) *
(PAGE_SIZE // COL_DATA_SIZE))
# Helper function for the translation of RID value to RID components
def getPageB(self, rid):
return (rid //
(PAGE_SIZE // COL_DATA_SIZE)) % (BASE_CONST + TAIL_CONST)
# Helper function for the translation of RID components to RID value
def getRID(self, pageR, pageB, offset):
return (pageR * (BASE_CONST + TAIL_CONST) *
(PAGE_SIZE // COL_DATA_SIZE)) + (
pageB * (PAGE_SIZE // COL_DATA_SIZE)) + offset
# Helper function to find the value of the next RID before writing to basepages
def nextBaseRid(self):
# Calls for calculation of the first two RID components
# #prerid = self.page_ranges[self.curr_page_range].nextBaseRid()
prerid = self.buffer_pool_range.nextBaseRid_Pool(self.curr_page_range)
# Calculates the last RID component and adds it together with the previous for the next base RID
rid = self.curr_page_range * (BASE_CONST + TAIL_CONST) * (
PAGE_SIZE // COL_DATA_SIZE) + prerid
return rid
# Helper function to find the value of the next tail RID before writing to tail pages
def nextTailRid(self, pageR):
# Calls for calculation of the first two RID components
# #prerid = self.page_ranges[self.curr_page_range].nextTailRid()
prerid = self.buffer_pool_range.nextTailRid_Pool(pageR)
# print("prerid:", prerid)
# Calculates the last RID component and adds it together with the previous for the next tail RID
rid = pageR * (BASE_CONST + TAIL_CONST) * (PAGE_SIZE //
COL_DATA_SIZE) + prerid
return rid
# Helper function unique for this metadata scheme
def formatCols(self, indir, rid, timestamp, schema, columns):
format_cols = []
format_cols.append(indir)
format_cols.append(rid)
format_cols.append(timestamp)
format_cols.append(schema)
for index in range(self.num_columns):
format_cols.append(columns[index])
return format_cols
# Function to set the RID of a record to the invalid value
def deleteRecord(self, rid):
pageR = self.getPageR(rid)
pageB = self.getPageB(rid)
offset = self.getOffset(rid)
# #self.page_ranges[pageR].deleteRecord(pageB, offset)
self.buffer_pool_range.deleteRecord_Pool(pageR, pageB, offset)
# Function to check the indirection value of a record before doing a full read
def checkIndirection(self, rid):
pageR = self.getPageR(rid)
pageB = self.getPageB(rid)
offset = self.getOffset(rid)
# print(pageR, pageB, offset)
# #indir = self.page_ranges[pageR].getIndirection(pageB, offset)
indir = self.buffer_pool_range.getIndirection_Pool(
pageR, pageB, offset)
# print("checked indir", indir)
if indir == 0:
return rid
else:
return indir
def readRecord(self, rid):
# Gets the true rid for the most recent version of the data
trueRID = self.checkIndirection(rid)
# Does the math to calculate pageR, pageB, and offset for record retrieval
pageR = self.getPageR(trueRID)
pageB = self.getPageB(trueRID)
offset = self.getOffset(trueRID)
# print("RID:",rid)
# print("TrueRID:",trueRID)
# print("Reading: Rid=",rid," pageR=",pageR," pageB=",pageB," offset=",offset)
# Retrieves record
# #full_record = self.page_ranges[pageR].readBlock(pageB, offset)
full_record = self.buffer_pool_range.readBlock_Pool(
pageR, pageB, offset)
# print("Full record:", full_record)
if full_record[RID_COLUMN] == 0:
return None
data_record = full_record[len(full_record) - self.num_columns:]
# print(full_record)
ret_record = Record(rid, data_record[self.key], data_record)
return ret_record
def insertRecord(self, columns):
# Check for room for base page, if not make more room
# #if self.page_ranges[self.curr_page_range].hasCapacityBase() == False:
if self.buffer_pool_range.hasCapacityBase_Pool(
self.curr_page_range) == False:
self.newPageRange()
indir = 0
schema_encoding = 0 # '0' * self.num_columns
cur_Time = 0 # time()
base_rid = self.nextBaseRid()
format_columns = self.formatCols(indir, base_rid, cur_Time,
schema_encoding, columns)
# print(format_columns)
# #self.page_ranges[self.curr_page_range].writeBaseBlock(format_columns)
self.buffer_pool_range.writeBaseBlock_Pool(self.curr_page_range,
format_columns)
self.index.insertPair(self.key, columns[self.key], base_rid)
return base_rid
def updateRecord(self, rid, columns):
# Check for room for tail page, if not make more room
# #if self.page_ranges[self.curr_page_range].hasCapacityTail() == False:
if self.buffer_pool_range.hasCapacityTail_Pool(
self.curr_page_range) == False:
self.newPageRange()
page_R = self.getPageR(rid)
page_B = self.getPageB(rid)
page_offset = self.getOffset(rid)
# #prev_vers = self.page_ranges[page_R].getIndirection(page_B, page_offset)
prev_vers = self.buffer_pool_range.getIndirection_Pool(
page_R, page_B, page_offset)
schema_encoding = 0 # '0' * self.num_columns
currTime = 0 # time()
tail_rid = self.nextTailRid(page_R)
prev_record = self.readRecord(rid)
if prev_record is None:
return
prev_columns = prev_record.getColumns()
# print(prev_columns)
new_columns = []
for index in range(self.num_columns):
if type(columns[index]) == type(None):
new_columns.append(prev_columns[index])
else:
new_columns.append(columns[index])
# print(new_columns)
# print("tail rid:", tail_rid)
format_columns = self.formatCols(prev_vers, tail_rid, currTime,
schema_encoding, new_columns)
# print(format_columns)
# #self.page_ranges[self.curr_page_range].writeTailBlock(format_columns)
# val = self.buffer_pool_range.writeTailBlock_Pool(self.curr_page_range, format_columns)
val = self.buffer_pool_range.writeTailBlock_Pool(
page_R, format_columns)
tail_rid2 = int(val)
# print("written tail rid:", tail_rid2)
# #self.page_ranges[page_R].editBlock(page_B, INDIRECTION_COLUMN, page_offset, tail_rid)
self.buffer_pool_range.editBlock_Pool(page_R, page_B,
INDIRECTION_COLUMN, page_offset,
tail_rid)
class Table:
"""
:param name: string #Table name
:param num_columns: int #Number of Columns: all columns are integer
:param key: int #Index of table key in columns
"""
def __init__(self, name, num_columns, key):
self.name = name
self.key = key
self.num_columns = num_columns
self.page_directory = {} # Replace with index, and all references inside table and query with index API
self.index = Index(self, self.num_columns)
self.buffer_pool_range = BufferPoolRange(BUFFER_POOL_SIZE_RANGE, num_columns)
# self.page_ranges = []
# self.page_ranges.append(PageRange(self.num_columns))
self.curr_page_range = 0
self.insertRecord([0] * num_columns)
#self.merge_queue = Queue()
self.lock = threading.Lock()
self.lock_manager_rids = {}
self.lock_manager_pageRanges = {}
def __str__(self):
return self.name
def lockReadRid(self, rid):
self.lock.acquire()
val = self.lock_manager_rids.get(rid)
if val is None:
self.lock_manager_rids[rid] = 0
val = 0
else:
pass
if val >= 0:
self.lock_manager_rids[rid] = val + 1
retval = True
else:
retval = False
self.lock.release()
return retval
def unlockReadRid(self, rid):
self.lock.acquire()
val = self.lock_manager_rids.get(rid)
if val is None:
self.lock_manager_rids[rid] = 0
val = 0
else:
pass
if val > 0:
self.lock_manager_rids[rid] = val - 1
retval = True
else:
retval = False
self.lock.release()
return retval
def lockWriteRid(self, rid):
self.lock.acquire()
val = self.lock_manager_rids.get(rid)
if val is None:
self.lock_manager_rids[rid] = 0
val = 0
else:
pass
if val == 0:
self.lock_manager_rids[rid] = val - 1
retval = True
else:
retval = False
self.lock.release()
return retval
def unlockWriteRid(self, rid):
self.lock.acquire()
val = self.lock_manager_rids.get(rid)
if val is None:
self.lock_manager_rids[rid] = 0
val = 0
else:
pass
if val == -1:
self.lock_manager_rids[rid] = val + 1
retval = True
else:
retval = False
self.lock.release()
return retval
def lockWriteRange(self, pageR):
self.lock.acquire()
val = self.lock_manager_pageRanges.get(pageR)
if val is None:
self.lock_manager_pageRanges[pageR] = 0
val = 0
else:
pass
if val == 0:
self.lock_manager_pageRanges[pageR] = val - 1
retval = True
else:
retval = False
self.lock.release()
return retval
def unlockWriteRange(self, pageR):
self.lock.acquire()
val = self.lock_manager_pageRanges.get(pageR)
if val is None:
self.lock_manager_pageRanges[pageR] = 0
val = 0
else:
pass
if val == -1:
self.lock_manager_pageRanges[pageR] = val + 1
retval = True
else:
retval = False
self.lock.release()
return retval
# Future function to merge tail records into base records
def merge(self, pageR):
# create deep copy of page range
deep_copy = self.buffer_pool_range.loadMerge(pageR)
tail_blocks = deep_copy.tail_count - 1 #indexes clear for removal, shift constant
new_copy = PageRange(self.num_columns)
read_block = None
# for all base blocks in deep_copy page range
for pageB in range(0, deep_copy.max_base):
# for all base records in a base block
for offset in range(0, deep_copy.page_blocks[pageB].pages[0].num_records):
# check if records is invalid
read_block = [0] * deep_copy.page_blocks[0].total
# print("Empty read block:", read_block)
if deep_copy.getRID(pageB, offset) == 0:
# empty record found, create empty record for writing
pass
else:
# record found, check indir column for most up to date version
indir = deep_copy.getIndirection(pageB, offset)
if indir == 0:
# version is up to date, copy over from original base record
read_block = deep_copy.readBlock(pageB, offset)
else:
# version is not up to date, copy over from indir tail record
inder_pageB = self.getPageB(indir)
inder_offset = self.getOffset(indir)
read_block = deep_copy.readBlock(inder_pageB, inder_offset)
# set record indir column to the original indir value
read_block[INDIRECTION_COLUMN] = indir
# print("read_block:", read_block)
checker = new_copy.hasCapacityBase()
if checker:
new_copy.writeBaseBlock(read_block)
else:
print("Unexpected error, new_copy at capacity")
self.buffer_pool_range.submitMerge(pageR, new_copy, tail_blocks)
'''
def enqueueMerge(self, pageR):
self.merge_queue.enqueue
def checkMerge(self):
if self.merge_queue.empty():
pass
else:
# run merge
next = self.merge_queue.get()
self.__merge(next)
pass
'''
def createIndex(self, column_num):
self.index.create_index(column_num)
def getIndex(self, column_num):
return self.index.getIndex(column_num)
def close(self):
self.buffer_pool_range.evictAll()
self.buffer_pool_range.lock = None
def getName(self):
return self.name
# Creates a new PageRange if needed, and appends it to page_ranges
def newPageRange(self):
# self.page_ranges.append(PageRange(self.num_columns))
# self.buffer_pool_range.
self.curr_page_range = self.curr_page_range + 1
# Helper function for the translation of RID value to RID components
def getOffset(self, rid):
return rid % (PAGE_SIZE // COL_DATA_SIZE)
# Helper function for the translation of RID value to RID components
def getPageR(self, rid):
return rid // ((BASE_CONST + TAIL_CONST) * (PAGE_SIZE // COL_DATA_SIZE))
# Helper function for the translation of RID value to RID components
def getPageB(self, rid):
return (rid // (PAGE_SIZE // COL_DATA_SIZE)) % (BASE_CONST + TAIL_CONST)
# Helper function for the translation of RID components to RID value
def getRID(self, pageR, pageB, offset):
return (pageR * (BASE_CONST + TAIL_CONST) * (PAGE_SIZE // COL_DATA_SIZE)) + (
pageB * (PAGE_SIZE // COL_DATA_SIZE)) + offset
# Helper function to find the value of the next RID before writing to basepages
def nextBaseRid(self):
# Calls for calculation of the first two RID components
# #prerid = self.page_ranges[self.curr_page_range].nextBaseRid()
prerid = self.buffer_pool_range.nextBaseRid_Pool(self.curr_page_range)
# Calculates the last RID component and adds it together with the previous for the next base RID
rid = self.curr_page_range * (BASE_CONST + TAIL_CONST) * (PAGE_SIZE // COL_DATA_SIZE) + prerid
return rid
# Helper function to find the value of the next tail RID before writing to tail pages
def nextTailRid(self, pageR):
# Calls for calculation of the first two RID components
# #prerid = self.page_ranges[self.curr_page_range].nextTailRid()
prerid = self.buffer_pool_range.nextTailRid_Pool(pageR)
# print("prerid:", prerid)
# Calculates the last RID component and adds it together with the previous for the next tail RID
rid = pageR * (BASE_CONST + TAIL_CONST) * (PAGE_SIZE // COL_DATA_SIZE) + prerid
return rid
# Helper function unique for this metadata scheme
def formatCols(self, indir, rid, timestamp, schema, columns):
format_cols = []
format_cols.append(indir)
format_cols.append(rid)
format_cols.append(timestamp)
format_cols.append(schema)
for index in range(self.num_columns):
format_cols.append(columns[index])
return format_cols
# Function to set the RID of a record to the invalid value
def deleteRecord(self, rid):
pageR = self.getPageR(rid)
pageB = self.getPageB(rid)
offset = self.getOffset(rid)
# #self.page_ranges[pageR].deleteRecord(pageB, offset)
self.buffer_pool_range.deleteRecord_Pool(pageR, pageB, offset)
# Function to check the indirection value of a record before doing a full read
def checkIndirection(self, rid):
pageR = self.getPageR(rid)
pageB = self.getPageB(rid)
offset = self.getOffset(rid)
# print(pageR, pageB, offset)
# #indir = self.page_ranges[pageR].getIndirection(pageB, offset)
indir = self.buffer_pool_range.getIndirection_Pool(pageR, pageB, offset)
# print("checked indir", indir)
if indir == 0:
return rid
else:
return indir
def readFullRecord(self,rid):
# Gets the true rid for the most recent version of the data
trueRID = self.checkIndirection(rid)
# Does the math to calculate pageR, pageB, and offset for record retrieval
pageR = self.getPageR(trueRID)
pageB = self.getPageB(trueRID)
offset = self.getOffset(trueRID)
# print("RID:",rid)
# print("TrueRID:",trueRID)
# print("Reading: Rid=",rid," pageR=",pageR," pageB=",pageB," offset=",offset)
# Retrieves record
# #full_record = self.page_ranges[pageR].readBlock(pageB, offset)
full_record = self.buffer_pool_range.readBlock_Pool(pageR, pageB, offset)
return full_record
def readRecord(self, rid):
# Gets the true rid for the most recent version of the data
trueRID = self.checkIndirection(rid)
# Does the math to calculate pageR, pageB, and offset for record retrieval
pageR = self.getPageR(trueRID)
pageB = self.getPageB(trueRID)
offset = self.getOffset(trueRID)
# print("RID:",rid)
# print("TrueRID:",trueRID)
# print("Reading: Rid=",rid," pageR=",pageR," pageB=",pageB," offset=",offset)
# Retrieves record
# #full_record = self.page_ranges[pageR].readBlock(pageB, offset)
full_record = self.buffer_pool_range.readBlock_Pool(pageR, pageB, offset)
# print("Full record:", full_record)
if full_record[RID_COLUMN] == 0:
return None
data_record = full_record[len(full_record) - self.num_columns:]
# print(full_record)
ret_record = Record(rid, data_record[self.key], data_record)
return ret_record
def insertRecord(self, columns):
# Check for room for base page, if not make more room
# #if self.page_ranges[self.curr_page_range].hasCapacityBase() == False:
if self.buffer_pool_range.hasCapacityBase_Pool(self.curr_page_range) == False:
self.newPageRange()
indir = 0
schema_encoding = 0 # '0' * self.num_columns
cur_Time = 0 # time()
base_rid = self.nextBaseRid()
format_columns = self.formatCols(indir, base_rid, cur_Time, schema_encoding, columns)
# print(format_columns)
# #self.page_ranges[self.curr_page_range].writeBaseBlock(format_columns)
self.buffer_pool_range.writeBaseBlock_Pool(self.curr_page_range, format_columns)
self.index.insertPair(self.key, columns[self.key], base_rid)
# Redundant to make sure we always have a current working page range
if self.buffer_pool_range.hasCapacityBase_Pool(self.curr_page_range) == False:
self.newPageRange()
return base_rid
def updateRecord(self, rid, columns):
# Check for room for tail page, if not make more room
# #if self.page_ranges[self.curr_page_range].hasCapacityTail() == False:
# print("update record space check", self.buffer_pool_range.hasCapacityTail_Pool(self.curr_page_range))
if self.buffer_pool_range.hasCapacityTail_Pool(self.curr_page_range) == False:
self.newPageRange()
page_R = self.getPageR(rid)
page_B = self.getPageB(rid)
page_offset = self.getOffset(rid)
# #prev_vers = self.page_ranges[page_R].getIndirection(page_B, page_offset)
prev_vers = self.buffer_pool_range.getIndirection_Pool(page_R, page_B, page_offset)
schema_encoding = 0 # '0' * self.num_columns
currTime = 0 # time()
tail_rid = self.nextTailRid(page_R)
prev_record = self.readRecord(rid)
if prev_record is None:
return
prev_columns = prev_record.getColumns()
# print(prev_columns)
new_columns = []
for index in range(self.num_columns):
if type(columns[index]) == type(None):
new_columns.append(prev_columns[index])
else:
new_columns.append(columns[index])
# print(new_columns)
# print("tail rid:", tail_rid)
format_columns = self.formatCols(prev_vers, tail_rid, currTime, schema_encoding, new_columns)
# print(format_columns)
# #self.page_ranges[self.curr_page_range].writeTailBlock(format_columns)
# val = self.buffer_pool_range.writeTailBlock_Pool(self.curr_page_range, format_columns)
val = self.buffer_pool_range.writeTailBlock_Pool(page_R, format_columns)
tail_rid2 = int(val)
# print("written tail rid:", tail_rid2)
# #self.page_ranges[page_R].editBlock(page_B, INDIRECTION_COLUMN, page_offset, tail_rid)
self.buffer_pool_range.editBlock_Pool(page_R, page_B, INDIRECTION_COLUMN, page_offset, tail_rid)