1/*
2 * Copyright (C) 2009 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 are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this 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#ifndef WorkerLoaderProxy_h
32#define WorkerLoaderProxy_h
33
34#if ENABLE(WORKERS)
35
36#include "ScriptExecutionContext.h"
37#include <wtf/Forward.h>
38#include <wtf/PassOwnPtr.h>
39
40namespace WebCore {
41
42    // A proxy to talk to the loader context. Normally, the document on the main thread
43    // provides loading services for the subordinate workers. This interface provides 2-way
44    // communications to the Document context and back to the worker.
45    // Note that in multi-process browsers, the Worker object context and the Document
46    // context can be distinct.
47    class WorkerLoaderProxy {
48    public:
49        virtual ~WorkerLoaderProxy() { }
50
51        // Posts a task to the thread which runs the loading code (normally, the main thread).
52        virtual void postTaskToLoader(PassOwnPtr<ScriptExecutionContext::Task>) = 0;
53
54        // Posts callbacks from loading code to the WorkerContext. The 'mode' is used to differentiate
55        // specific synchronous loading requests so they can be 'nested', per spec.
56        // Returns true if the task was posted successfully.
57        virtual bool postTaskForModeToWorkerContext(PassOwnPtr<ScriptExecutionContext::Task>, const String& mode) = 0;
58    };
59
60} // namespace WebCore
61
62#endif // ENABLE(WORKERS)
63
64#endif // WorkerLoaderProxy_h
65