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 (and 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;
  24                 var initData;
  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                 getSupportedInitDataType().then(function(type) {
  34                     initDataType = type;
  35                     initData = getInitData(initDataType);
  36                     return navigator.requestMediaKeySystemAccess('org.w3.clearkey', [{}]);
  37                 }).then(function(access) {
  38                     return access.createMediaKeys();
  39                 }).then(function(result) {
  40                     mediaKeys = result;
  41
  42                     // Verify MediaKeys is an ActiveDOMObject.
  43                     // In non-Oilpan, numActiveDOMObjectsCreate() == 1.
  44                     // In Oilpan, numActiveDOMObjectsCreate() <= 4.
  45                     // (1 MediaKeys,
  46                     //  1 MediaKeysInitializer and
  47                     //  1 MediaKeySystemAccessInitializer (navigator.requestMediaKeySystemAccess() use above),
  48                     //  1 MediaKeySystemAccessInitializer (isInitDataSupported() (via getSupportedInitDataType())))
  49                     assert_between_inclusive(numActiveDOMObjectsCreated(), 1, 4, 'MediaKeys.create()');
  50
  51                     mediaKeySession1 = mediaKeys.createSession();
  52                     return mediaKeySession1.generateRequest(initDataType, initData);
  53                 }).then(function() {
  54                     // Should be 1 MediaKeys + 1 MediaKeySession.
  55                     // In non-Oilpan, numActiveDOMObjectsCreate() == 2.
  56                     // In Oilpan, numActiveDOMObjectsCreate() <= 6.
  57                     // (1 MediaKeys,
  58                     //  1 MediaKeysInitializer,
  59                     //  2 MediaKeySystemAccessInitializers,
  60                     //  1 ContentDecryptionModuleResultPromise and
  61                     //  1 MediaKeySession).
  62                     assert_between_inclusive(numActiveDOMObjectsCreated(), 2, 6, 'MediaKeys.createSession(1)');
  63
  64                     mediaKeySession2 = mediaKeys.createSession();
  65                     return mediaKeySession2.generateRequest(initDataType, initData);
  66                 }).then(function() {
  67                     // Should be 1 MediaKeys + 2 MediaKeySessions.
  68                     // In non-Oilpan, numActiveDOMObjectsCreate() == 3.
  69                     // In Oilpan, numActiveDOMObjectsCreate() <= 8.
  70                     // (1 MediaKeys,
  71                     //  1 MediaKeysInitializer,
  72                     //  2 MediaKeySystemAccessInitializers,
  73                     //  2 ContentDecryptionModuleResultPromise and
  74                     //  2 MediaKeySession).
  75                     assert_between_inclusive(numActiveDOMObjectsCreated(), 3, 8, 'mediaKeys.createSession(2)');
  76
  77                     // Close the sessions. Once completed, only the JS
  78                     // reference to them keeps them around.
  79                     return mediaKeySession1.close();
  80                 }).then(function(result) {
  81                     return mediaKeySession2.close();
  82                 }).then(function(result) {
  83                     // Since both sessions have been closed, dropping the
  84                     // reference to them from JS will result in the session
  85                     // being garbage-collected.
  86                     // Should be 1 MediaKeys + 2 MediaKeySessions.
  87                     // In non-Oilpan, numActiveDOMObjectsCreate() == 3.
  88                     // In Oilpan, numActiveDOMObjectsCreate() <= 10.
  89                     // (1 MediaKeys,
  90                     //  1 MediaKeysInitializer,
  91                     //  2 MediaKeySystemAccessInitializers,
  92                     //  4 ContentDecryptionModuleResultPromise and
  93                     //  2 MediaKeySession).
  94                     assert_between_inclusive(numActiveDOMObjectsCreated(), 3, 10, 'after close');
  95
  96                     mediaKeySession1 = null;
  97                     return createGCPromise();
  98                 }).then(function() {
  99                     // Only MediaKeys + mediaKeySession2 should remain.
 100                     // In non-Oilpan, there is also something from createGCPromise().
 101                     assert_between_inclusive(numActiveDOMObjectsCreated(), 2, 3, 'mediaKeySession1 not collected');
 102
 103                     mediaKeySession2 = null;
 104                     return createGCPromise();
 105                 }).then(function() {
 106                     // Only MediaKeys should remain.
 107                     // In non-Oilpan, there is also something from createGCPromise().
 108                     assert_between_inclusive(numActiveDOMObjectsCreated(), 1, 2, 'mediaKeySession2 not collected');
 109                     test.done();
 110                 }).catch(function(error) {
 111                     forceTestFailureFromPromise(test, error);
 112                 });
 113             }, 'MediaKeySession lifetime after release()');
 114         </script>
 115     </body>
 116 </html>