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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| OLD | NEW |
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| (Empty) | |
| 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 var startingActiveDOMObjectCount; | |
|
ddorwin
2014/04/02 21:02:36
Initialize. -1 might be best since it should alway
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| 25 | |
| 26 function numActiveDOMObjectsCreated() | |
| 27 { | |
| 28 return window.internals.activeDOMObjectCount(document) - startin gActiveDOMObjectCount; | |
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ddorwin
2014/04/02 21:02:36
I missed the fact that this relied on the other va
jrummell
2014/04/02 21:58:21
The test framework ends up allocating a couple of
| |
| 29 } | |
| 30 | |
| 31 // For this test, simply verify that creating and destroying | |
| 32 // MediaKeys doesn't crash. | |
| 33 test(function() | |
| 34 { | |
| 35 // Create a MediaKeys object and free immediately. | |
| 36 var mediaKeys = new MediaKeys("org.w3.clearkey"); | |
| 37 mediaKeys = null; | |
| 38 gc(); | |
| 39 | |
| 40 // Create a MediaKeys object and make sure gc doesn't free it | |
| 41 // as long as we have a reference. | |
| 42 mediaKeys = new MediaKeys("org.w3.clearkey"); | |
| 43 gc(); | |
| 44 assert_equals(mediaKeys.keySystem, 'org.w3.clearkey'); | |
| 45 mediaKeys = null; | |
| 46 gc(); | |
| 47 | |
| 48 }, "MediaKeys lifetime"); | |
| 49 | |
| 50 // For this test, create a MediaKeySession (which is an | |
| 51 // ActiveDOMObject) and verify lifetime. | |
| 52 test(function() | |
| 53 { | |
| 54 var mediaKeys; | |
| 55 var initData = new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7]); | |
| 56 startingActiveDOMObjectCount = window.internals.activeDOMObjectC ount(document); | |
| 57 assert_equals(numActiveDOMObjectsCreated(), 0); | |
| 58 | |
| 59 // Create a MediaKeys object with a session. | |
| 60 mediaKeys = new MediaKeys("org.w3.clearkey"); | |
| 61 mediaKeys.createSession("video/webm", initData); | |
| 62 assert_equals(numActiveDOMObjectsCreated(), 1); | |
| 63 | |
| 64 // Run gc(), should not affect MediaKeys object nor the session | |
| 65 // since we still have a reference to it. | |
| 66 gc(); | |
| 67 assert_equals(mediaKeys.keySystem, 'org.w3.clearkey'); | |
| 68 assert_equals(numActiveDOMObjectsCreated(), 1); | |
| 69 | |
| 70 // Drop reference to the MediaKeys object and run gc again. | |
| 71 // Object should be collected this time. Since | |
| 72 // MediaKeySessions remain alive as long as MediaKeys is around, | |
| 73 // it is possible that gc() checks the MediaKeySession object | |
| 74 // first, and doesn't collect it since MediaKeys hasn't been | |
| 75 // collected yet. Thus run gc() twice, to ensure that the | |
| 76 // unreferenced MediaKeySession object get collected. | |
| 77 mediaKeys = null; | |
| 78 gc(); | |
| 79 gc(); | |
| 80 assert_equals(numActiveDOMObjectsCreated(), 0); | |
| 81 | |
| 82 }, "MediaKeys lifetime with session"); | |
| 83 | |
| 84 // For this test, create several MediaKeys (with MediaKeySessions so | |
| 85 // they can be counted) and verify lifetime. | |
| 86 test(function() | |
| 87 { | |
| 88 var mediaKeys; | |
| 89 var initData = new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7]); | |
| 90 startingActiveDOMObjectCount = window.internals.activeDOMObjectC ount(document); | |
| 91 assert_equals(numActiveDOMObjectsCreated(), 0); | |
| 92 | |
| 93 // Create a few MediaKeys objects. Only keep a reference to the | |
| 94 // last one created. | |
| 95 for (var i = 0; i < 5; ++i) { | |
| 96 mediaKeys = new MediaKeys("org.w3.clearkey"); | |
| 97 mediaKeys.createSession("video/webm", initData); | |
| 98 } | |
| 99 assert_equals(numActiveDOMObjectsCreated(), 5); | |
| 100 | |
| 101 // All but the last one created should be garbage collected. | |
| 102 // Since MediaKeySessions remain alive as long as MediaKeys is | |
| 103 // around, it is possible that gc() checks the MediaKeySession | |
| 104 // object first, and doesn't collect it since MediaKeys hasn't | |
| 105 // been collected yet. Thus run gc() twice, to ensure that the | |
| 106 // unreferenced MediaKeySession objects get collected. | |
| 107 gc(); | |
| 108 gc(); | |
| 109 assert_equals(numActiveDOMObjectsCreated(), 1); | |
| 110 assert_equals(mediaKeys.keySystem, 'org.w3.clearkey'); | |
| 111 | |
| 112 // Release the last MediaKeys object created. | |
| 113 mediaKeys = null; | |
| 114 gc(); | |
| 115 gc(); | |
| 116 assert_equals(numActiveDOMObjectsCreated(), 0); | |
| 117 }, "Multiple MediaKeys lifetime"); | |
| 118 </script> | |
| 119 </body> | |
| 120 </html> | |
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