LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeys.html - Issue 180203002: Add EME content test that forces garbage collection

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Issue 180203002: Add EME content test that forces garbage collection (Closed) Base URL: https://chromium.googlesource.com/chromium/blink.git@master

Patch Set: local numActiveDOMObjectsCreated() Created 6 years, 8 months ago

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	1 <!DOCTYPE html>

	2 <html>

	3 <head>

	4 <title>Test MediaKeys lifetime</title>

	5 <script src="../../resources/testharness.js"></script>

	6 <script src="../../resources/testharnessreport.js"></script>

	7 <script src="../../resources/gc.js"></script>

	8 </head>

	9 <body>

	10 <div id="log"></div>

	11 <script>

	12 // Since MediaKeys are not ActiveDOMObjects, it is hard to

	13 // determine when they are garbage collected. For some tests below

	14 // a MediaKeySession (which is an ActiveDOMObject) is added so

	15 // there is something to count.

	16

	17 // MediaKeySessions remain as long as:

	18 // JavaScript has a reference to it

	19 // OR (MediaKeys is around AND the session has not received a clos e() event)

	20 // In the tests below, we do not close any session nor keep a

	21 // Javascript reference to any session, so MediaKeySessions remain

	22 // as long as the associated MediaKeys object is around.

	23

	24 // For this test, simply verify that creating and destroying

	25 // MediaKeys doesn't crash.

	26 test(function()

	27 {

	28 // Create a MediaKeys object and free immediately.

	29 var mediaKeys = new MediaKeys("org.w3.clearkey");

	30 mediaKeys = null;

	31 gc();

	32

	33 // Create a MediaKeys object and make sure gc doesn't free it

	34 // as long as we have a reference.

	35 mediaKeys = new MediaKeys("org.w3.clearkey");

	36 gc();

	37 assert_equals(mediaKeys.keySystem, 'org.w3.clearkey');

	38 mediaKeys = null;

	39 gc();

	40

	41 }, "MediaKeys lifetime");

	42

	43 // For this test, create a MediaKeySession (which is an

	44 // ActiveDOMObject) and verify lifetime.

	45 test(function()

	46 {

	47 var mediaKeys;

	48 var initData = new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7]);

	49 var startingActiveDOMObjectCount = window.internals.activeDOMObj ectCount(document);

	50

	51 function numActiveDOMObjectsCreated()

	52 {

	53 return window.internals.activeDOMObjectCount(document) - sta rtingActiveDOMObjectCount;

	54 }

	55

	56 // Create a MediaKeys object with a session.

	57 mediaKeys = new MediaKeys("org.w3.clearkey");

	58 mediaKeys.createSession("video/webm", initData);

	59 assert_equals(numActiveDOMObjectsCreated(), 1);

	60

	61 // Run gc(), should not affect MediaKeys object nor the session

	62 // since we still have a reference to it.

	63 gc();

	64 assert_equals(mediaKeys.keySystem, 'org.w3.clearkey');

	65 assert_equals(numActiveDOMObjectsCreated(), 1);

	66

	67 // Drop reference to the MediaKeys object and run gc again.

	68 // Object should be collected this time. Since

	69 // MediaKeySessions remain alive as long as MediaKeys is around,

	70 // it is possible that gc() checks the MediaKeySession object

	71 // first, and doesn't collect it since MediaKeys hasn't been

	72 // collected yet. Thus run gc() twice, to ensure that the

	73 // unreferenced MediaKeySession object get collected.

	74 mediaKeys = null;

	75 gc();

	76 gc();

	77 assert_equals(numActiveDOMObjectsCreated(), 0);

	78

	79 }, "MediaKeys lifetime with session");

	80

	81 // For this test, create several MediaKeys (with MediaKeySessions so

	82 // they can be counted) and verify lifetime.

	83 test(function()

	84 {

	85 var mediaKeys;

	86 var initData = new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7]);

	87 var startingActiveDOMObjectCount = window.internals.activeDOMObj ectCount(document);

	88

	89 function numActiveDOMObjectsCreated()

	90 {

	91 return window.internals.activeDOMObjectCount(document) - sta rtingActiveDOMObjectCount;

	92 }

	93

	94 // Create a few MediaKeys objects. Only keep a reference to the

	95 // last one created.

	96 for (var i = 0; i < 5; ++i) {

	97 mediaKeys = new MediaKeys("org.w3.clearkey");

	98 mediaKeys.createSession("video/webm", initData);

	99 }

	100 assert_equals(numActiveDOMObjectsCreated(), 5);

	101

	102 // All but the last one created should be garbage collected.

	103 // Since MediaKeySessions remain alive as long as MediaKeys is

	104 // around, it is possible that gc() checks the MediaKeySession

	105 // object first, and doesn't collect it since MediaKeys hasn't

	106 // been collected yet. Thus run gc() twice, to ensure that the

	107 // unreferenced MediaKeySession objects get collected.

	108 gc();

	109 gc();

	110 assert_equals(numActiveDOMObjectsCreated(), 1);

	111 assert_equals(mediaKeys.keySystem, 'org.w3.clearkey');

	112

	113 // Release the last MediaKeys object created.

	114 mediaKeys = null;

	115 gc();

	116 gc();

	117 assert_equals(numActiveDOMObjectsCreated(), 0);

	118 }, "Multiple MediaKeys lifetime");

	119 </script>

	120 </body>

	121 </html>

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