| <!DOCTYPE html> |
| <script src="../../resources/gc.js"></script> |
| <script src="../../resources/js-test.js"></script> |
| <script src="resources/shared.js"></script> |
| <script> |
| |
| description("Verify that that cursors weakly hold request, and work if request is GC'd"); |
| |
| indexedDBTest(prepareDatabase, onOpen); |
| |
| function prepareDatabase(evt) |
| { |
| preamble(evt); |
| evalAndLog("db = event.target.result"); |
| evalAndLog("store = db.createObjectStore('store')"); |
| store.put("value1", "key1"); |
| store.put("value2", "key2"); |
| } |
| |
| function onOpen(evt) |
| { |
| preamble(evt); |
| evalAndLog("db = event.target.result"); |
| evalAndLog("tx = db.transaction('store')"); |
| evalAndLog("store = tx.objectStore('store')"); |
| |
| evalAndLog("cursorRequest = store.openCursor()"); |
| cursorRequest.onsuccess = function openCursorRequestSuccess(evt) { |
| preamble(evt); |
| debug("Result will be checked later, to ensure that lazy access is safe"); |
| }; |
| |
| evalAndLog("otherRequest = store.get(0)"); |
| otherRequest.onsuccess = function otherRequestSuccess(evt) { |
| preamble(evt); |
| |
| debug("Verify that the request's result can be accessed lazily:"); |
| evalAndLog("gc()"); |
| |
| evalAndLog("cursor = cursorRequest.result"); |
| shouldBeNonNull("cursor"); |
| shouldBeEqualToString("cursor.key", "key1"); |
| shouldBeEqualToString("cursor.value", "value1"); |
| evalAndLog("cursorRequest.extra = 123"); |
| evalAndLog("cursor.extra = 456"); |
| |
| // Assign a new handler to inspect the request and cursor indirectly. |
| cursorRequest.onsuccess = function cursorContinueSuccess(evt) { |
| preamble(evt); |
| evalAndLog("cursor = event.target.result"); |
| shouldBeNonNull("cursor"); |
| shouldBeEqualToString("cursor.key", "key2"); |
| shouldBeEqualToString("cursor.value", "value2"); |
| shouldBe("event.target.extra", "123"); |
| shouldBe("cursor.extra", "456"); |
| }; |
| |
| debug("Ensure request is not released if cursor is still around."); |
| cursorRequestObservation = internals.observeGC(cursorRequest); |
| evalAndLog("cursorRequest = null"); |
| evalAndLog("gc()"); |
| shouldBeFalse("cursorRequestObservation.wasCollected"); |
| |
| evalAndLog("cursor.continue()"); |
| |
| cursorObservation = internals.observeGC(cursor); |
| evalAndLog("cursor = null"); |
| evalAndLog("gc()"); |
| shouldBeFalse("cursorObservation.wasCollected"); |
| |
| evalAndLog("finalRequest = store.get(0)"); |
| finalRequest.onsuccess = function finalRequestSuccess(evt) { |
| preamble(evt); |
| shouldBeEqualToString("cursor.key", "key2"); |
| shouldBeEqualToString("cursor.value", "value2"); |
| |
| // Access objects in an inner function to avoid references to |
| // objects remaining live on this function's stack frame |
| // (http://crbug.com/595672/). |
| (() => { cursorObservation = internals.observeGC(cursor); })(); |
| evalAndLog("cursor = null"); |
| asyncGC(function () { |
| shouldBeTrue("cursorRequestObservation.wasCollected"); |
| shouldBeTrue("cursorObservation.wasCollected"); |
| }); |
| }; |
| }; |
| |
| tx.oncomplete = finishJSTest; |
| } |
| |
| |
| </script> |
