third_party/WebKit/LayoutTests/storage/indexeddb/prefetch-race.html

   1 <!DOCTYPE html>
   2 <script src="../../resources/js-test.js"></script>
   3 <script src="resources/shared.js"></script>
   4 <script>
   5
   6 description("Ensure IndexedDB's cursor prefetch cache requests are invalidated");
   7
   8 indexedDBTest(prepareDatabase, onOpenSuccess);
   9 function prepareDatabase(evt)
  10 {
  11     preamble(evt);
  12     evalAndLog("db = event.target.result");
  13     evalAndLog("store = db.createObjectStore('store')");
  14     debug("Populate with even records...");
  15     for (var i = 0; i < 10; i += 2)
  16         store.put(i, i);
  17 }
  18
  19 function onOpenSuccess(evt)
  20 {
  21     preamble(evt);
  22     evalAndLog("db = event.target.result");
  23
  24     evalAndLog("tx = db.transaction('store', 'readwrite')");
  25     evalAndLog("store = tx.objectStore('store')");
  26     evalAndLog("request = store.openCursor()");
  27
  28     kPrefetchThreshold = 3;
  29
  30     expected = ["0", "2", "4", "6", "7", "8", "9"];
  31     continueCount = 0;
  32     request.onsuccess = function cursorSuccess() {
  33         preamble();
  34         cursor = request.result;
  35         if (!cursor)
  36             return;
  37         ++continueCount;
  38
  39         expect = expected.shift();
  40         shouldBe("cursor.key", expect);
  41         evalAndLog("cursor.continue()");
  42
  43         if (continueCount === kPrefetchThreshold) {
  44             debug("\nThat should have triggered a prefetch, injecting odd records...");
  45             for (var i = 1; i < 10; i += 2)
  46                 store.put(i, i);
  47         }
  48     };
  49
  50     tx.oncomplete = function() {
  51         shouldBe("continueCount", "7");
  52         finishJSTest();
  53     };
  54 }
  55 </script>