32 lines
1.3 KiB
JavaScript
32 lines
1.3 KiB
JavaScript
promise_test(() => {
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// The first promise waits for one buffered flag observer to receive 3 entries.
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const promise1 = new Promise(resolve1 => {
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let numObserved1 = 0;
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new PerformanceObserver((entryList, obs) => {
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// This buffered flag observer is constructed after a regular observer detects a mark.
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new PerformanceObserver(list => {
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numObserved1 += list.getEntries().length;
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if (numObserved1 == 3)
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resolve1();
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}).observe({type: 'mark', buffered: true});
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obs.disconnect();
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}).observe({entryTypes: ['mark']});
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performance.mark('foo');
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});
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// The second promise waits for another buffered flag observer to receive 3 entries.
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const promise2 = new Promise(resolve2 => {
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step_timeout(() => {
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let numObserved2 = 0;
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// This buffered flag observer is constructed after a delay of 100ms.
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new PerformanceObserver(list => {
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numObserved2 += list.getEntries().length;
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if (numObserved2 == 3)
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resolve2();
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}).observe({type: 'mark', buffered: true});
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}, 100);
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performance.mark('bar');
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});
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performance.mark('meow');
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// Pass if and only if both buffered observers received all 3 mark entries.
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return Promise.all([promise1, promise2]);
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}, 'Multiple PerformanceObservers with buffered flag see all entries');
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