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| (Empty) | |
| 1 <!DOCTYPE html> |
| 2 <html> |
| 3 <head> |
| 4 <title>Test MediaKeySession lifetime</title> |
| 5 <script src="../w3c-media-utils.js"></script> |
| 6 <script src="../../resources/testharness.js"></script> |
| 7 <script src="../../resources/testharnessreport.js"></script> |
| 8 <script src="../../resources/gc.js"></script> |
| 9 </head> |
| 10 <body> |
| 11 <div id="log"></div> |
| 12 <script> |
| 13 // Since MediaKeySession (but not MediaKeys) are ActiveDOMObjects, |
| 14 // we can determine when they are garbage collected. |
| 15 // MediaKeySessions remain as long as: |
| 16 // JavaScript has a reference to it |
| 17 // OR (MediaKeys is around AND the session has not received a clos
e() event) |
| 18 test(function() |
| 19 { |
| 20 var initData = new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7]); |
| 21 var startingActiveDOMObjectCount = window.internals.activeDOMObj
ectCount(document); |
| 22 |
| 23 function numActiveDOMObjectsCreated() |
| 24 { |
| 25 return window.internals.activeDOMObjectCount(document) - sta
rtingActiveDOMObjectCount; |
| 26 } |
| 27 |
| 28 var mediaKeys = new MediaKeys("org.w3.clearkey"); |
| 29 assert_equals(mediaKeys.keySystem, 'org.w3.clearkey'); |
| 30 |
| 31 // Verify MediaKeys are not ActiveDOMObjects. |
| 32 assert_equals(numActiveDOMObjectsCreated(), 0, "MediaKeys create
d an ActiveDOMObject"); |
| 33 |
| 34 // Create 3 sessions. |
| 35 var mediaKeySession1 = mediaKeys.createSession("video/webm", ini
tData); |
| 36 assert_equals(numActiveDOMObjectsCreated(), 1); |
| 37 var mediaKeySession2 = mediaKeys.createSession("video/webm", ini
tData); |
| 38 assert_equals(numActiveDOMObjectsCreated(), 2); |
| 39 var mediaKeySession3 = mediaKeys.createSession("video/webm", ini
tData); |
| 40 assert_equals(numActiveDOMObjectsCreated(), 3); |
| 41 |
| 42 // Run gc(). All sessions should remain as we have a reference |
| 43 // to each one. |
| 44 gc(); |
| 45 assert_equals(numActiveDOMObjectsCreated(), 3); |
| 46 |
| 47 // Now drop references to 2 of the sessions. Even though we |
| 48 // don't have a reference, MediaKeys is still around (and the |
| 49 // sessions aren't closed), so the objects won't be collected. |
| 50 mediaKeySession2 = null; |
| 51 mediaKeySession3 = null; |
| 52 gc(); |
| 53 assert_equals(numActiveDOMObjectsCreated(), 3); |
| 54 |
| 55 // Now drop the reference to MediaKeys. It and the 2 |
| 56 // unreferenced sessions should be collected. Since |
| 57 // MediaKeySessions remain alive as long as MediaKeys is around, |
| 58 // it is possible that gc() checks one or both MediaKeySession |
| 59 // objects first, and doesn't collect them since MediaKeys |
| 60 // hasn't been collected yet. Thus run gc() twice, to ensure |
| 61 // that the unreferenced MediaKeySession objects get collected. |
| 62 mediaKeys = null; |
| 63 gc(); |
| 64 gc(); |
| 65 assert_equals(numActiveDOMObjectsCreated(), 1); |
| 66 |
| 67 // Drop the reference to the first session. It should get |
| 68 // collected now since MediaKeys is gone. |
| 69 mediaKeySession1 = null; |
| 70 gc(); |
| 71 assert_equals(numActiveDOMObjectsCreated(), 0); |
| 72 }, "MediaKeySession lifetime without release()"); |
| 73 </script> |
| 74 </body> |
| 75 </html> |
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Chromium Code Reviews
Issue 209103002:
Add lifetime tests for MediaKeySession (Closed)
Base URL: https://chromium.googlesource.com/chromium/blink.git@master