<!--
Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/
-->
<
html>
<
head>
<
title>Indexed Database Blob Add/Delete Stress Test</
title>
<
script src=
"/tests/SimpleTest/SimpleTest.js"></
script>
<
link rel=
"stylesheet" type=
"text/css" href=
"/tests/SimpleTest/test.css"/>
<
script type=
"text/javascript">
/*
* This is a stress test which rapidly adds and deletes blobs in a row in
* separate transactions. Internally, blobs are only removed when all memory
* and database references drop to zero. At that point an asynchronous
* delete operation is scheduled which removes the backing file from disk.
* So the overall behavior and timing depends on cycle collection and
* garbage collection. The main goal of this test is to make it more likely
* that internal structures are accessed by multiple threads at the same
*
time, potentially discovering races or other issues.
*
* Note that the test needs to always create a new blob and a new
* transaction, otherwise new backing files wouldn
't be created due to
* internal optimizations for de-duplication.
*/
function* testSteps()
{
const READ_WRITE =
"readwrite";
const name = window.location.pathname;
const objectStoreName =
"Blobs";
{
const request = indexedDB.open(name, 1);
request.onerror = errorHandler;
request.onupgradeneeded = grabEventAndContinueHandler;
request.onsuccess = grabEventAndContinueHandler;
}
{
const event = yield undefined;
is(event.type,
"upgradeneeded",
"Got correct event type");
const db = event.target.result;
db.onerror = errorHandler;
const objectStore = db.createObjectStore(objectStoreName, {});
objectStore.add(getRandomBlob(1), 1);
}
{
const event = yield undefined;
is(event.type,
"success",
"Got correct event type");
const db = event.target.result;
db.onerror = errorHandler;
let index = 1;
function doWork() {
const transaction = db.transaction([objectStoreName], READ_WRITE);
const objectStore = transaction.objectStore(objectStoreName);
const deleteRequest = objectStore.delete(index);
deleteRequest.onsuccess = function () {
index++;
const addRequest = objectStore.add(getRandomBlob(1), index);
addRequest.onsuccess = function () {
if (index < 1000) {
doWork();
} else {
continueToNextStep();
}
};
};
}
doWork();
yield undefined;
}
finishTest();
}
</
script>
<
script type=
"text/javascript" src=
"file.js"></
script>
<
script type=
"text/javascript" src=
"helpers.js"></
script>
</
head>
<
body onload=
"runTest();"></
body>
</
html>
