mozilla-central/testing/web-platform/tests/IndexedDB/writer-starvation.any.js (file symbol)

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// META: title=IndexedDB writer starvation test
// META: global=window,worker
// META: script=resources/support.js
// META: timeout=long
'use strict';
async_test(t => {
let db;
let read_request_count = 0;
let read_success_count = 0;
let write_request_count = 0;
let write_success_count = 0;
const RQ_COUNT = 25;
const open_rq = createdb(t);
open_rq.onupgradeneeded = t.step_func((e) => {
db = e.target.result;
db.createObjectStore('s').add('1', 1);
});
open_rq.onsuccess = t.step_func((e) => {
let i = 0;
// Pre-fill some read requests.
for (i = 0; i < RQ_COUNT; i++) {
read_request_count++;
db.transaction('s', 'readonly').objectStore('s').get(1).onsuccess =
t.step_func((e) => {
read_success_count++;
assert_equals(e.target.transaction.mode, 'readonly');
});
}
t.step(loop);
function loop() {
read_request_count++;
db.transaction('s', 'readonly').objectStore('s').get(1).onsuccess =
t.step_func((e) => {
read_success_count++;
assert_equals(e.target.transaction.mode, 'readonly');
if (read_success_count >= RQ_COUNT && write_request_count == 0) {
write_request_count++;
db.transaction('s', 'readwrite')
.objectStore('s')
.add('written', read_request_count)
.onsuccess = t.step_func((e) => {
write_success_count++;
assert_equals(e.target.transaction.mode, 'readwrite');
assert_equals(
e.target.result, read_success_count,
'write cb came before later read cb\'s');
});
// Reads done after the write.
for (i = 0; i < 5; i++) {
read_request_count++;
db.transaction('s', 'readonly')
.objectStore('s')
.get(1)
.onsuccess = t.step_func((e) => {
read_success_count++;
});
}
}
});
if (read_success_count < RQ_COUNT + 5) {
step_timeout(t.step_func(loop), write_request_count ? 1000 : 100);
} else {
// This runs finish() once `read_success_count` >= RQ_COUNT + 5.
db.transaction('s', 'readonly').objectStore('s').count().onsuccess =
t.step_func(() => {
step_timeout(t.step_func(finish), 100);
});
}
}
});
function finish() {
assert_equals(read_request_count, read_success_count, 'read counts');
assert_equals(write_request_count, write_success_count, 'write counts');
t.done();
}
}, 'IDB read requests should not starve write requests');