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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer
     12  *    in the documentation and/or other materials provided with the
     13  *    distribution.
     14  * 3. Neither the name of Google Inc. nor the names of its contributors
     15  *    may be used to endorse or promote products derived from this
     16  *    software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "core/dom/custom/CustomElementCallbackDispatcher.h"
     33 
     34 #include "core/dom/custom/CustomElementCallbackQueue.h"
     35 #include "core/dom/custom/CustomElementScheduler.h"
     36 #include "wtf/MainThread.h"
     37 
     38 namespace WebCore {
     39 
     40 size_t CustomElementCallbackDispatcher::s_elementQueueStart = 0;
     41 
     42 // The base of the stack has a null sentinel value.
     43 size_t CustomElementCallbackDispatcher::s_elementQueueEnd = kNumSentinels;
     44 
     45 CustomElementCallbackDispatcher& CustomElementCallbackDispatcher::instance()
     46 {
     47     DEFINE_STATIC_LOCAL(CustomElementCallbackDispatcher, instance, ());
     48     return instance;
     49 }
     50 
     51 // Dispatches callbacks when popping the processing stack.
     52 void CustomElementCallbackDispatcher::processElementQueueAndPop()
     53 {
     54     instance().processElementQueueAndPop(s_elementQueueStart, s_elementQueueEnd);
     55 }
     56 
     57 void CustomElementCallbackDispatcher::processElementQueueAndPop(size_t start, size_t end)
     58 {
     59     ASSERT(isMainThread());
     60     CustomElementCallbackQueue::ElementQueueId thisQueue = currentElementQueue();
     61 
     62     for (size_t i = start; i < end; i++) {
     63         {
     64             // The created callback may schedule entered document
     65             // callbacks.
     66             CallbackDeliveryScope deliveryScope;
     67             m_flattenedProcessingStack[i]->processInElementQueue(thisQueue);
     68         }
     69 
     70         ASSERT(start == s_elementQueueStart);
     71         ASSERT(end == s_elementQueueEnd);
     72     }
     73 
     74     // Pop the element queue from the processing stack
     75     m_flattenedProcessingStack.resize(start);
     76     s_elementQueueEnd = start;
     77 
     78     if (s_elementQueueStart == kNumSentinels)
     79         CustomElementScheduler::callbackDispatcherDidFinish();
     80 }
     81 
     82 void CustomElementCallbackDispatcher::enqueue(CustomElementCallbackQueue* callbackQueue)
     83 {
     84     ASSERT(inCallbackDeliveryScope());
     85 
     86     if (callbackQueue->owner() == currentElementQueue())
     87         return;
     88 
     89     callbackQueue->setOwner(currentElementQueue());
     90 
     91     m_flattenedProcessingStack.append(callbackQueue);
     92     ++s_elementQueueEnd;
     93 }
     94 
     95 } // namespace WebCore
     96