src/third_party/WebKit/LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeysession-release.html

   1 <!DOCTYPE html>
   2 <html>
   3     <head>
   4         <title>MediaKeySession lifetime after release()</title>
   5         <script src="encrypted-media-utils.js"></script>
   6         <script src="../../resources/testharness.js"></script>
   7         <script src="../../resources/testharnessreport.js"></script>
   8     </head>
   9     <body>
  10         <div id="log"></div>
  11         <script>
  12             // Since MediaKeySession (but not MediaKeys) are ActiveDOMObjects,
  13             // we can determine when they are garbage collected.
  14             // MediaKeySessions remain as long as:
  15             //   JavaScript has a reference to it
  16             //   OR (MediaKeys is around
  17             //       AND the session has not received a close() event)
  18             async_test(function(test)
  19             {
  20                 var mediaKeys;
  21                 var mediaKeySession1;
  22                 var mediaKeySession2;
  23                 var initDataType = getInitDataType();
  24                 var initData = getInitData(initDataType);
  25                 var startingActiveDOMObjectCount = window.internals.activeDOMObjectCount(document);
  26
  27                 function numActiveDOMObjectsCreated()
  28                 {
  29                     return window.internals.activeDOMObjectCount(document) - startingActiveDOMObjectCount;
  30                 }
  31
  32                 // Create 2 sessions.
  33                 MediaKeys.create('org.w3.clearkey').then(function(result) {
  34                     mediaKeys = result;
  35
  36                     // Verify MediaKeys are not an ActiveDOMObject.
  37                     assert_equals(numActiveDOMObjectsCreated(), 0, 'MediaKeys.create()');
  38
  39                     mediaKeySession1 = mediaKeys.createSession();
  40                     return mediaKeySession1.generateRequest(initDataType, initData);
  41                 }).then(function() {
  42                     // Should be 1 MediaKeySession.
  43                     assert_equals(numActiveDOMObjectsCreated(), 1, 'mediaKeys.createSession(1)');
  44                     mediaKeySession2 = mediaKeys.createSession();
  45                     return mediaKeySession2.generateRequest(initDataType, initData);
  46                 }).then(function() {
  47                     // Should be 2 MediaKeySessions.
  48                     assert_equals(numActiveDOMObjectsCreated(), 2, 'mediaKeys.createSession(2)');
  49
  50                     // Release the sessions. Once completed, only the JS
  51                     // reference to them keeps them around.
  52                     return mediaKeySession1.release();
  53                 }).then(function(result) {
  54                     return mediaKeySession2.release();
  55                 }).then(function(result) {
  56                     // Since both sessions have been closed, dropping the
  57                     // reference to them from JS will result in the session
  58                     // being garbage-collected.
  59                     // Should be 2 MediaKeySessions.
  60                     assert_equals(numActiveDOMObjectsCreated(), 2);
  61
  62                     mediaKeySession1 = null;
  63                     return createGCPromise();
  64                 }).then(function(result) {
  65                     // Only mediaKeySession2 should remain.
  66                     assert_equals(numActiveDOMObjectsCreated(), 1, 'mediaKeySession1 not collected');
  67
  68                     mediaKeySession2 = null;
  69                     return createGCPromise();
  70                 }).then(function(result) {
  71                     assert_equals(numActiveDOMObjectsCreated(), 0, 'mediaKeySession2 not collected');
  72                     test.done();
  73                 }).catch(function(error) {
  74                     forceTestFailureFromPromise(test, error);
  75                 });
  76             }, 'MediaKeySession lifetime after release()');
  77         </script>
  78     </body>
  79 </html>