Worker.h revision 0bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5 
1/*
2 * Copyright (C) 2008 Apple 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#ifndef Worker_h
28#define Worker_h
29
30#if ENABLE(WORKERS)
31
32#include "AbstractWorker.h"
33#include "ActiveDOMObject.h"
34#include "AtomicStringHash.h"
35#include "EventListener.h"
36#include "EventTarget.h"
37#include "WorkerScriptLoaderClient.h"
38#include <wtf/OwnPtr.h>
39#include <wtf/PassRefPtr.h>
40#include <wtf/RefCounted.h>
41#include <wtf/RefPtr.h>
42
43namespace WebCore {
44
45    class ScriptExecutionContext;
46    class String;
47    class WorkerContextProxy;
48    class WorkerScriptLoader;
49
50    typedef int ExceptionCode;
51
52    class Worker : public AbstractWorker, private WorkerScriptLoaderClient {
53    public:
54        static PassRefPtr<Worker> create(const String& url, ScriptExecutionContext* context, ExceptionCode& ec) { return adoptRef(new Worker(url, context, ec)); }
55        ~Worker();
56
57        virtual Worker* toWorker() { return this; }
58
59        void postMessage(const String&, ExceptionCode&);
60        void postMessage(const String&, MessagePort*, ExceptionCode&);
61
62        void terminate();
63
64        void dispatchMessage(const String&, PassRefPtr<MessagePort>);
65        void dispatchErrorEvent();
66
67        virtual bool canSuspend() const;
68        virtual void stop();
69        virtual bool hasPendingActivity() const;
70
71        void setOnmessage(PassRefPtr<EventListener> eventListener) { m_onMessageListener = eventListener; }
72        EventListener* onmessage() const { return m_onMessageListener.get(); }
73
74    private:
75        Worker(const String&, ScriptExecutionContext*, ExceptionCode&);
76
77        virtual void notifyFinished();
78
79        virtual void refEventTarget() { ref(); }
80        virtual void derefEventTarget() { deref(); }
81
82        OwnPtr<WorkerScriptLoader> m_scriptLoader;
83
84        WorkerContextProxy* m_contextProxy; // The proxy outlives the worker to perform thread shutdown.
85
86        RefPtr<EventListener> m_onMessageListener;
87    };
88
89} // namespace WebCore
90
91#endif // ENABLE(WORKERS)
92
93#endif // Worker_h
94