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| 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> |
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Chromium Code Reviews
Issue 2781623008:
More thorough overlapping cursor tests. (Closed)
