-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathtable.rs
More file actions
533 lines (421 loc) Β· 15.6 KB
/
table.rs
File metadata and controls
533 lines (421 loc) Β· 15.6 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
use super::filewriter::{BinaryFileWriter, Writer};
use super::index::RIndex;
use super::page::PhysicalPage;
use super::pagerange::{PageRange, PageRangeMetadata};
use super::record::{Record, RecordMetadata};
use crate::container::{ReservedColumns, NUM_RESERVED_COLUMNS};
use crate::index::RIndexHandle;
use pyo3::prelude::*;
use rustc_hash::FxHashMap;
use serde::{Deserialize, Serialize};
use std::sync::{Arc, Mutex, RwLock};
type RedoxQLHashMap<K, V> = FxHashMap<K, V>;
#[derive(Default, Clone, Serialize, Deserialize)]
pub struct PageDirectoryMetadata {
pub directory: RedoxQLHashMap<i64, RecordMetadata>,
}
#[derive(Default, Clone)]
pub struct PageDirectory {
pub directory: RedoxQLHashMap<i64, Record>,
}
impl PageDirectory {
pub fn new() -> Self {
PageDirectory {
directory: RedoxQLHashMap::default(),
}
}
pub fn display(&self) {
for (rid, record) in self.directory.clone() {
print!("{rid} -> ");
let m = record.addresses;
let b = m.lock().unwrap();
let c = b.iter();
for addr in c {
println!("{:?}", addr);
}
print!("\n\n\n");
}
}
fn load_state(page_range: &PageRange) -> PageDirectory {
let base_phys_pages = &page_range.base_container.physical_pages;
let tail_phys_pages = &page_range.tail_container.physical_pages;
// Create a map of column_indexes to the physical pages there are stored in
let mut base_pages = RedoxQLHashMap::<i64, Arc<Mutex<PhysicalPage>>>::default();
let mut tail_pages = RedoxQLHashMap::<i64, Arc<Mutex<PhysicalPage>>>::default();
// Load the base pages into the map
for page in base_phys_pages {
let m = page.lock().unwrap();
base_pages.insert(m.column_index, page.clone());
}
// Load the tail pages into the map
for page in tail_phys_pages {
let m = page.lock().unwrap();
tail_pages.insert(m.column_index, page.clone());
}
let writer = Writer::new(Box::new(BinaryFileWriter::new()));
let page_meta: PageDirectoryMetadata = writer.read_file("./redoxdata/page_directory.data");
let mut pd: PageDirectory = PageDirectory {
directory: RedoxQLHashMap::default(),
};
// Load records into page_directory
for (rid, record_meta) in page_meta.directory {
let rec = record_meta.load_state(&base_pages, &tail_pages);
pd.directory.insert(rid, rec);
}
// pd.display();
return pd;
}
fn save_state(&self) {
let mut pd_meta = PageDirectoryMetadata {
directory: RedoxQLHashMap::default(),
};
for (rid, record) in &self.directory {
let r: RecordMetadata = record.get_metadata();
pd_meta.directory.insert(*rid, r);
}
let writer = Writer::new(Box::new(BinaryFileWriter::new()));
writer.write_file("./redoxdata/page_directory.data", &pd_meta);
}
}
#[derive(Serialize, Deserialize, Debug)]
pub struct RTableMetadata {
pub name: String,
pub primary_key_column: usize,
pub num_records: i64,
pub num_columns: usize,
pub page_range: PageRangeMetadata,
pub table_num: i64,
pub updates_since_merge: i64,
}
pub trait StatePersistence {
fn load_state(&self, table_num: i64) -> RTable {
let filename = format!("./redoxdata/{}-table.data", table_num);
let writer = Writer::new(Box::new(BinaryFileWriter::new()));
let table_meta: RTableMetadata = writer.read_file(&filename);
let pr = PageRange::load_state();
let pd = PageDirectory::load_state(&pr);
let mut t = RTable {
name: table_meta.name.clone(),
primary_key_column: table_meta.primary_key_column,
num_columns: table_meta.num_columns,
num_records: table_meta.num_records,
page_range: pr,
page_directory: pd,
index: Arc::new(RwLock::new(RIndex::new())),
table_num: table_meta.table_num,
updates_since_merge: table_meta.updates_since_merge,
};
// It does not make sense to clone here
let arc_table = Arc::new(RwLock::new(t.clone()));
let weak_table = Arc::downgrade(&arc_table);
let index = RIndex::load_state(weak_table);
t.index = Arc::new(RwLock::new(index));
return t;
}
}
impl StatePersistence for RTableMetadata {}
impl StatePersistence for RTable {}
#[derive(Clone, Default)]
#[pyclass]
pub struct RTable {
pub name: String,
pub primary_key_column: usize,
pub page_range: PageRange,
// Map RIDs to Records
pub page_directory: PageDirectory,
pub num_records: i64,
#[pyo3(get)]
pub num_columns: usize,
pub index: Arc<RwLock<RIndex>>,
/// The nth table that was created will have the value n here and is indexed by zero
pub table_num: i64,
pub updates_since_merge: i64,
}
impl RTable {
pub fn write(&mut self, values: Vec<i64>) -> Record {
// Use the primary_key_column'th value as the given key
let primary_key = values[self.primary_key_column];
let rid = self.num_records;
{
let mut index = self.index.write().unwrap();
index.add(primary_key, rid);
}
let rec = self.page_range.write(rid, values);
// Save the RID -> Record so it can later be read
self.page_directory.directory.insert(rid, rec.clone());
self.num_records += 1;
return rec;
}
pub fn read_base(&self, primary_key: i64) -> Option<Vec<i64>> {
// Lookup RID from primary_key
let index = self.index.try_read().unwrap();
let rid = index.get(primary_key);
if let Some(r) = rid {
let rec = self.page_directory.directory.get(&r);
// If the rec exists in the page_directory, return the read values
match rec {
Some(r) => return self.page_range.read(r.clone()),
None => return None,
}
}
None
}
pub fn read(&self, primary_key: i64) -> Option<Vec<i64>> {
let Some(result) = self.read_base(primary_key as i64) else {
return None;
};
let base_rid = result[ReservedColumns::RID as usize];
let base_indirection_column = result[ReservedColumns::Indirection as usize];
if base_rid == base_indirection_column {
return Some(result);
}
let Some(tail_record) = self.page_directory.directory.get(&base_indirection_column) else {
return None;
};
return self.page_range.read(tail_record.clone());
}
// Given a RID, get the record's values
pub fn read_by_rid(&self, rid: i64) -> Option<Vec<i64>> {
if let Some(record) = self.page_directory.directory.get(&rid) {
return self.page_range.read(record.clone());
}
None
}
pub fn read_relative(&self, primary_key: i64, relative_version: i64) -> Option<Vec<i64>> {
let Some(base) = self.read_base(primary_key as i64) else {
return None;
};
let base_rid = base[ReservedColumns::RID as usize];
let base_indirection_column = base[ReservedColumns::Indirection as usize];
if base_rid == base_indirection_column {
return Some(base);
}
let mut current_rid = base_indirection_column;
let mut versions_back = 0;
let target_version = relative_version.abs() as i64;
while versions_back < target_version {
let Some(current_record) = self.page_directory.directory.get(¤t_rid) else {
return None;
};
// read the current record
let Some(record_data) = self.page_range.read(current_record.clone()) else {
return None;
};
// get the indirection of the previous version
let prev_indirection: i64 = record_data[ReservedColumns::Indirection as usize];
// if we've reached the base record, stop here
if prev_indirection == base_rid {
current_rid = base_rid;
break;
}
current_rid = prev_indirection;
versions_back += 1;
}
// read the final record we want
let Some(final_record) = self.page_directory.directory.get(¤t_rid) else {
return None;
};
return self.page_range.read(final_record.clone());
}
pub fn delete(&mut self, primary_key: i64) {
// Lookup RID from primary_key
let index = self.index.read().unwrap();
let rid = index.get(primary_key);
if let Some(r) = rid {
self.page_directory.directory.remove(&r);
}
}
pub fn sum(&mut self, start_primary_key: i64, end_primary_key: i64, col_index: i64) -> i64 {
let mut agg = 0i64;
for primary_key in start_primary_key..end_primary_key + 1 {
if let Some(v) = self.read(primary_key) {
agg += v[(col_index + NUM_RESERVED_COLUMNS) as usize] as i64;
}
}
return agg;
}
pub fn sum_version(
&mut self,
start_primary_key: i64,
end_primary_key: i64,
col_index: i64,
relative_version: i64,
) -> i64 {
let mut agg = 0i64;
for primary_key in start_primary_key..end_primary_key + 1 {
if let Some(v) = self.read_relative(primary_key, relative_version) {
agg += v[(col_index + NUM_RESERVED_COLUMNS) as usize] as i64;
}
}
return agg;
}
/// Save the state of RTable in a file
pub fn save_state(&self) {
// Save the state of the page range
self.page_range.save_state();
self.page_directory.save_state();
self.index.read().unwrap().save_state();
let table_meta = self.get_metadata();
let filename = format!("./redoxdata/{}-table.data", self.table_num);
let writer = Writer::new(Box::new(BinaryFileWriter::new()));
writer.write_file(&filename, &table_meta);
}
pub fn get_metadata(&self) -> RTableMetadata {
RTableMetadata {
name: self.name.clone(),
primary_key_column: self.primary_key_column,
num_columns: self.num_columns,
num_records: self.num_records,
page_range: self.page_range.get_metadata(),
table_num: self.table_num,
updates_since_merge: self.updates_since_merge,
}
}
pub fn merge(&mut self) {
self.page_range
.merge(Arc::new(Mutex::new(self.page_directory.clone())));
}
}
#[derive(Default, Clone)]
#[pyclass]
pub struct RTableHandle {
pub table: Arc<RwLock<RTable>>,
}
#[pymethods]
impl RTableHandle {
pub fn write(&self, values: Vec<i64>) {
let mut table = self.table.write().expect("Failed to acquire write lock");
table.write(values);
}
pub fn read(&self, primary_key: i64) -> Option<Vec<i64>> {
let table = self.table.read().expect("Failed to acquire read lock");
table.read(primary_key)
}
pub fn delete(&self, primary_key: i64) {
let mut table = self.table.write().expect("Failed to acquire write lock");
table.delete(primary_key);
}
pub fn debug_page_dir(&self) {
let t = self.table.read().unwrap();
t.page_directory.display();
}
// Allow access to properties
#[getter]
pub fn get_num_records(&self) -> i64 {
let table = self.table.read().expect("Failed to acquire read lock");
table.num_records
}
#[getter]
pub fn index(&self) -> RIndexHandle {
let table = self.table.read().expect("Failed to acquire read lock");
RIndexHandle {
index: table.index.clone(),
}
}
#[getter]
pub fn get_name(&self) -> String {
let table = self.table.read().expect("Failed to acquire read lock");
table.name.clone()
}
#[getter]
pub fn get_num_columns(&self) -> usize {
let table = self.table.read().expect("Failed to acquire read lock");
table.num_columns
}
#[getter]
pub fn get_primary_key_column(&self) -> usize {
let table = self.table.read().expect("Failed to acquire read lock");
table.primary_key_column
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::database::RDatabase;
#[test]
fn load_and_save_test() {
let mut db = RDatabase::new();
let table_ref = db.create_table("Scores".to_string(), 3, 0);
let mut table = table_ref.table.write().unwrap();
table.write(vec![0, 10, 12]);
table.write(vec![0, 10, 12]);
table.write(vec![0, 10, 12]);
table.write(vec![0, 10, 12]);
table.save_state();
let new_table: RTable = table.load_state(0);
assert_eq!(table.name, new_table.name);
assert_eq!(table.primary_key_column, new_table.primary_key_column);
assert_eq!(table.num_records, new_table.num_records);
assert_eq!(table.num_columns, new_table.num_columns);
assert_eq!(new_table.num_records, 4);
}
#[test]
fn read_and_write_test() {
let mut db = RDatabase::new();
let table_ref = db.create_table("Scores".to_string(), 3, 0);
let mut table = table_ref.table.write().unwrap();
// Write
table.write(vec![0, 10, 12]);
// Read and check
assert_eq!(table.read(0).unwrap(), vec![0, 0, 0, 0, 0, 10, 12]);
// Write
table.write(vec![1, 20, 30]);
// Read and check
assert_eq!(table.read(1).unwrap(), vec![1, 0, 1, 1, 1, 20, 30]);
}
#[test]
fn read_base_and_write_test() {
let mut db = RDatabase::new();
let table_ref = db.create_table("Scores".to_string(), 3, 0);
let mut table = table_ref.table.write().unwrap();
// Write
table.write(vec![0, 10, 12]);
// Read and check
assert_eq!(table.read_base(0).unwrap(), vec![0, 0, 0, 0, 0, 10, 12]);
// Write
table.write(vec![4, 20, 30]);
// Read and check
assert_eq!(table.read_base(4).unwrap(), vec![1, 0, 1, 1, 4, 20, 30]);
}
#[test]
fn sum_test() {
let mut db = RDatabase::new();
let table_ref = db.create_table("Scores".to_string(), 2, 0);
let mut table = table_ref.table.write().unwrap();
table.write(vec![0, 10]);
table.write(vec![1, 20]);
table.write(vec![2, 5]);
table.write(vec![3, 100]);
// Sum the values in col 1
assert_eq!(table.sum(0, 3, 1), 135);
// Sum the primary keys in col 0
assert_eq!(table.sum(0, 3, 0), 6);
// Sum the values in col 1 from 1-2
assert_eq!(table.sum(1, 2, 1), 25);
}
#[test]
fn large_sum_test() {
let mut db = RDatabase::new();
let table_ref = db.create_table("Scores".to_string(), 2, 0);
let mut table = table_ref.table.write().unwrap();
for x in 0..100_000 {
table.write(vec![x, x]);
}
let v = table.sum(0, 100_000, 0);
assert_eq!((100_000 - 1) * 100_000 / 2, v);
}
#[test]
fn delete_test() {
let mut db = RDatabase::new();
let table_ref = db.create_table("Scores".to_string(), 3, 0);
let mut table = table_ref.table.write().unwrap();
// Write
table.write(vec![0, 10, 12]);
// Read and check
assert_eq!(table.read_base(0).unwrap(), vec![0, 0, 0, 0, 0, 10, 12]);
// Delete
table.delete(0);
// Read and find None
assert_eq!(table.read_base(0), None);
}
}