Index: third_party/WebKit/Source/core/dom/custom/V0CustomElementMicrotaskDispatcher.cpp |
diff --git a/third_party/WebKit/Source/core/dom/custom/V0CustomElementMicrotaskDispatcher.cpp b/third_party/WebKit/Source/core/dom/custom/V0CustomElementMicrotaskDispatcher.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..3f95d69f219d9bfcf52f916f289f0010d14fb781 |
--- /dev/null |
+++ b/third_party/WebKit/Source/core/dom/custom/V0CustomElementMicrotaskDispatcher.cpp |
@@ -0,0 +1,87 @@ |
+// Copyright 2014 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "core/dom/custom/V0CustomElementMicrotaskDispatcher.h" |
+ |
+#include "bindings/core/v8/Microtask.h" |
+#include "core/dom/custom/V0CustomElementCallbackQueue.h" |
+#include "core/dom/custom/V0CustomElementMicrotaskImportStep.h" |
+#include "core/dom/custom/V0CustomElementProcessingStack.h" |
+#include "core/dom/custom/V0CustomElementScheduler.h" |
+ |
+namespace blink { |
+ |
+static const V0CustomElementCallbackQueue::ElementQueueId kMicrotaskQueueId = 0; |
+ |
+V0CustomElementMicrotaskDispatcher::V0CustomElementMicrotaskDispatcher() |
+ : m_hasScheduledMicrotask(false) |
+ , m_phase(Quiescent) |
+{ |
+} |
+ |
+V0CustomElementMicrotaskDispatcher& V0CustomElementMicrotaskDispatcher::instance() |
+{ |
+ DEFINE_STATIC_LOCAL(V0CustomElementMicrotaskDispatcher, instance, (new V0CustomElementMicrotaskDispatcher)); |
+ return instance; |
+} |
+ |
+void V0CustomElementMicrotaskDispatcher::enqueue(V0CustomElementCallbackQueue* queue) |
+{ |
+ ensureMicrotaskScheduledForElementQueue(); |
+ queue->setOwner(kMicrotaskQueueId); |
+ m_elements.append(queue); |
+} |
+ |
+void V0CustomElementMicrotaskDispatcher::ensureMicrotaskScheduledForElementQueue() |
+{ |
+ DCHECK(m_phase == Quiescent || m_phase == Resolving); |
+ ensureMicrotaskScheduled(); |
+} |
+ |
+void V0CustomElementMicrotaskDispatcher::ensureMicrotaskScheduled() |
+{ |
+ if (!m_hasScheduledMicrotask) { |
+ Microtask::enqueueMicrotask(WTF::bind(&dispatch)); |
+ m_hasScheduledMicrotask = true; |
+ } |
+} |
+ |
+void V0CustomElementMicrotaskDispatcher::dispatch() |
+{ |
+ instance().doDispatch(); |
+} |
+ |
+void V0CustomElementMicrotaskDispatcher::doDispatch() |
+{ |
+ DCHECK(isMainThread()); |
+ |
+ DCHECK(m_phase == Quiescent); |
+ DCHECK(m_hasScheduledMicrotask); |
+ m_hasScheduledMicrotask = false; |
+ |
+ // Finishing microtask work deletes all |
+ // V0CustomElementCallbackQueues. Being in a callback delivery scope |
+ // implies those queues could still be in use. |
+ ASSERT_WITH_SECURITY_IMPLICATION(!V0CustomElementProcessingStack::inCallbackDeliveryScope()); |
+ |
+ m_phase = Resolving; |
+ |
+ m_phase = DispatchingCallbacks; |
+ for (const auto& element : m_elements) { |
+ // Created callback may enqueue an attached callback. |
+ V0CustomElementProcessingStack::CallbackDeliveryScope scope; |
+ element->processInElementQueue(kMicrotaskQueueId); |
+ } |
+ |
+ m_elements.clear(); |
+ V0CustomElementScheduler::microtaskDispatcherDidFinish(); |
+ m_phase = Quiescent; |
+} |
+ |
+DEFINE_TRACE(V0CustomElementMicrotaskDispatcher) |
+{ |
+ visitor->trace(m_elements); |
+} |
+ |
+} // namespace blink |