OLD | NEW |
| (Empty) |
1 <!doctype html> | |
2 <meta charset="utf-8"> | |
3 <meta name="timeout" content="long"> | |
4 <title>IndexedDB: Parallel iteration of multiple overlapping cursors</title> | |
5 <link rel="author" href="pwnall@chromium.org" title="Victor Costan"> | |
6 <script src="/resources/testharness.js"></script> | |
7 <script src="/resources/testharnessreport.js"></script> | |
8 <script src="support-promises.js"></script> | |
9 <script src="interleaved-cursors-support.js"></script> | |
10 <script> | |
11 'use strict'; | |
12 | |
13 // Number of objects that each iterator goes over. | |
14 const itemCount = 2; | |
15 | |
16 // Ratio of small objects to large objects. | |
17 const largeObjectRatio = 5; | |
18 | |
19 function objectKey(cursorIndex, itemIndex) { | |
20 const itemString = itemIndex.toString().padStart(5, '0'); | |
21 return `key-${itemString}`; | |
22 } | |
23 | |
24 function objectValue(cursorIndex, itemIndex) { | |
25 if ((itemCount + itemIndex) % largeObjectRatio === 0) | |
26 return largeObjectValue(0, itemIndex); | |
27 return ['small', itemIndex]; | |
28 } | |
29 | |
30 // Reads all the cursors in parallel. Returns a promise that resolves when the | |
31 // reading is done. | |
32 function parallelCursors(testCase, store, cursorCount) { | |
33 const promises = []; | |
34 const cursors = new CursorBank(testCase, store, cursorCount); | |
35 | |
36 for (let cursorIndex = 0; cursorIndex < cursorCount; ++cursorIndex) { | |
37 const promise = new Promise((resolve, reject) => { | |
38 let callback = resolve; | |
39 for (let itemIndex = itemCount; itemIndex >= 1; --itemIndex) { | |
40 callback = cursors.continueCursor.bind( | |
41 cursors, cursorIndex, itemIndex, callback); | |
42 } | |
43 cursors.openCursor(cursorIndex, callback); | |
44 }); | |
45 promises.push(promise); | |
46 } | |
47 return Promise.all(promises); | |
48 } | |
49 | |
50 for (let cursorCount of [1, 10, 100, 1000, 10000]) { | |
51 promise_test(testCase => { | |
52 return createDatabase(testCase, (database, transaction) => { | |
53 const store = database.createObjectStore('cache', { keyPath: 'key' }); | |
54 }).then(database => { | |
55 return populateTestStore(testCase, database, 1).then(() => database); | |
56 }).then(database => { | |
57 database.close(); | |
58 }).then(() => { | |
59 return openDatabase(testCase); | |
60 }).then(database => { | |
61 const transaction = database.transaction('cache', 'readonly'); | |
62 transaction.onabort = () => { reject(transaction.error); }; | |
63 | |
64 const store = transaction.objectStore('cache'); | |
65 return parallelCursors(testCase, store, cursorCount, itemCount).then( | |
66 () => database); | |
67 }).then(database => { | |
68 database.close(); | |
69 }); | |
70 }, `${cursorCount} cursors`); | |
71 } | |
72 | |
73 </script> | |
OLD | NEW |