1/*
2 * Copyright (C) 2010 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 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 */
26
27#include "config.h"
28#include "WorkerEventQueue.h"
29
30#include "DOMWindow.h"
31#include "Document.h"
32#include "Event.h"
33#include "EventNames.h"
34#include "ScriptExecutionContext.h"
35
36namespace WebCore {
37
38PassOwnPtr<WorkerEventQueue> WorkerEventQueue::create(ScriptExecutionContext* context)
39{
40    return adoptPtr(new WorkerEventQueue(context));
41}
42
43WorkerEventQueue::WorkerEventQueue(ScriptExecutionContext* context)
44    : m_scriptExecutionContext(context)
45    , m_isClosed(false)
46{
47}
48
49WorkerEventQueue::~WorkerEventQueue()
50{
51    close();
52}
53
54class WorkerEventQueue::EventDispatcherTask : public ScriptExecutionContext::Task {
55public:
56    static PassOwnPtr<EventDispatcherTask> create(PassRefPtr<Event> event, WorkerEventQueue* eventQueue)
57    {
58        return adoptPtr(new EventDispatcherTask(event, eventQueue));
59    }
60
61    virtual ~EventDispatcherTask()
62    {
63        if (m_event)
64            m_eventQueue->removeEvent(m_event.get());
65    }
66
67    void dispatchEvent(ScriptExecutionContext*, PassRefPtr<Event> event)
68    {
69        event->target()->dispatchEvent(event);
70    }
71
72    virtual void performTask(ScriptExecutionContext* context)
73    {
74        if (m_isCancelled)
75            return;
76        m_eventQueue->removeEvent(m_event.get());
77        dispatchEvent(context, m_event);
78        m_event.clear();
79    }
80
81    void cancel()
82    {
83        m_isCancelled = true;
84        m_event.clear();
85    }
86
87private:
88    EventDispatcherTask(PassRefPtr<Event> event, WorkerEventQueue* eventQueue)
89        : m_event(event)
90        , m_eventQueue(eventQueue)
91        , m_isCancelled(false)
92    {
93    }
94
95    RefPtr<Event> m_event;
96    WorkerEventQueue* m_eventQueue;
97    bool m_isCancelled;
98};
99
100void WorkerEventQueue::removeEvent(Event* event)
101{
102    m_eventTaskMap.remove(event);
103}
104
105bool WorkerEventQueue::enqueueEvent(PassRefPtr<Event> prpEvent)
106{
107    if (m_isClosed)
108        return false;
109    RefPtr<Event> event = prpEvent;
110    OwnPtr<EventDispatcherTask> task = EventDispatcherTask::create(event, this);
111    m_eventTaskMap.add(event.release(), task.get());
112    m_scriptExecutionContext->postTask(task.release());
113    return true;
114}
115
116bool WorkerEventQueue::cancelEvent(Event* event)
117{
118    EventDispatcherTask* task = m_eventTaskMap.get(event);
119    if (!task)
120        return false;
121    task->cancel();
122    removeEvent(event);
123    return true;
124}
125
126void WorkerEventQueue::close()
127{
128    m_isClosed = true;
129    for (EventTaskMap::iterator it = m_eventTaskMap.begin(); it != m_eventTaskMap.end(); ++it) {
130        EventDispatcherTask* task = it->value;
131        task->cancel();
132    }
133    m_eventTaskMap.clear();
134}
135
136}
137