<!--
Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/
-->
<
html>
<
head>
<
title>Indexed Database Test</
title>
<
script type=
"text/javascript">
function report(result) {
var message = {
source:
"iframe" };
message.result = result;
window.parent.postMessage(message,
"*");
}
function runIndexedDBTest() {
var db = null;
// Create the data-store
function createDatastore() {
try {
var request = indexedDB.open(window.location.pathname, 1);
request.onupgradeneeded = function(event) {
event.target.result.createObjectStore(
"foo");
};
request.onsuccess = function(event) {
db = event.target.result;
createAndStoreBlob();
};
}
catch (e) {
dump(
"EXCEPTION IN CREATION: " + e +
"\n " + e.stack +
"\n");
report(false);
}
}
function createAndStoreBlob() {
const BLOB_DATA = [
"fun ",
"times ",
"all ",
"around!"];
var blob = new Blob(BLOB_DATA, { type:
"text/plain" });
var objectStore = db.transaction(
"foo",
"readwrite").objectStore(
"foo");
objectStore.add({ blob }, 42).onsuccess = refetchBlob;
}
function refetchBlob() {
var foo = db.transaction(
"foo").objectStore(
"foo");
foo.get(42).onsuccess = fetchedBlobCreateWorkerAndSendBlob;
}
function fetchedBlobCreateWorkerAndSendBlob(event) {
var idbBlob = event.target.result.blob;
var compositeBlob = new Blob([
"I like the following blob: ", idbBlob],
{ type:
"text/fancy" });
function workerScript() {
/* eslint-env worker */
onmessage = function(event) {
// Save the Blob to the worker
's global scope.
self.holdOntoBlob = event.data;
// Send any message so we can serialize and keep our runtime behaviour
// consistent.
postMessage(
"kung fu death grip established");
};
}
var url =
URL.createObjectURL(new Blob([
"(", workerScript.toString(),
")()"]));
// Keep a reference to the worker on the window.
var worker = window.worker = new Worker(url);
worker.postMessage(compositeBlob);
worker.onmessage = workerLatchedBlobDeleteFromDB;
}
function workerLatchedBlobDeleteFromDB() {
// Delete the reference to the Blob from the database leaving the worker
// thread reference as the only live reference once a GC has cleaned
// out our references that we sent to the worker. The page that owns
// us triggers a GC just for that reason.
var objectStore = db.transaction(
"foo",
"readwrite").objectStore(
"foo");
objectStore.delete(42).onsuccess = closeDBTellOwningThread;
}
function closeDBTellOwningThread() {
// Now that worker has latched the blob, clean up the database.
db.close();
db = null;
report(
"ready");
}
createDatastore();
}
</
script>
</
head>
<
body onload=
"runIndexedDBTest();">
</
body>
</
html>
