mozilla-central/dom/indexedDB/test/unit/test_writer_starvation.js (file symbol)

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Test Info: Warnings

/**
* Any copyright is dedicated to the Public Domain.
*/
/* eslint-disable mozilla/no-arbitrary-setTimeout */
if (!this.window) {
this.runTest = function () {
todo(false, "Test disabled in xpcshell test suite for now");
finishTest();
};
}
var testGenerator = testSteps();
function* testSteps() {
const name = this.window ? window.location.pathname : "Splendid Test";
// Needs to be enough to saturate the thread pool.
const SYNC_REQUEST_COUNT = 25;
let request = indexedDB.open(name, 1);
request.onerror = errorHandler;
request.onupgradeneeded = grabEventAndContinueHandler;
request.onsuccess = grabEventAndContinueHandler;
let event = yield undefined;
let db = event.target.result;
db.onerror = errorHandler;
is(event.target.transaction.mode, "versionchange", "Correct mode");
let objectStore = db.createObjectStore("foo", { autoIncrement: true });
request = objectStore.add({});
request.onerror = errorHandler;
request.onsuccess = grabEventAndContinueHandler;
event = yield undefined;
let key = event.target.result;
ok(key, "Got a key");
yield undefined;
let continueReading = true;
let readerCount = 0;
let writerCount = 0;
let callbackCount = 0;
// Generate a bunch of reads right away without returning to the event
// loop.
info("Generating " + SYNC_REQUEST_COUNT + " readonly requests");
for (let i = 0; i < SYNC_REQUEST_COUNT; i++) {
readerCount++;
let request = db.transaction("foo").objectStore("foo").get(key);
request.onsuccess = function (event) {
is(event.target.transaction.mode, "readonly", "Correct mode");
callbackCount++;
};
}
while (continueReading) {
readerCount++;
info("Generating additional readonly request (" + readerCount + ")");
let request = db.transaction("foo").objectStore("foo").get(key);
request.onsuccess = function (event) {
callbackCount++;
info("Received readonly request callback (" + callbackCount + ")");
is(event.target.transaction.mode, "readonly", "Correct mode");
if (callbackCount == SYNC_REQUEST_COUNT) {
writerCount++;
info(
"Generating 1 readwrite request with " +
readerCount +
" previous readonly requests"
);
let request = db
.transaction("foo", "readwrite")
.objectStore("foo")
.add({}, readerCount);
request.onsuccess = function (event) {
callbackCount++;
info("Received readwrite request callback (" + callbackCount + ")");
is(event.target.transaction.mode, "readwrite", "Correct mode");
is(
event.target.result,
callbackCount,
"write callback came before later reads"
);
};
} else if (callbackCount == SYNC_REQUEST_COUNT + 5) {
continueReading = false;
}
};
setTimeout(
function () {
testGenerator.next();
},
writerCount ? 1000 : 100
);
yield undefined;
}
while (callbackCount < readerCount + writerCount) {
executeSoon(function () {
testGenerator.next();
});
yield undefined;
}
is(callbackCount, readerCount + writerCount, "All requests accounted for");
finishTest();
yield undefined;
}