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 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
32#ifndef PingLoader_h
33#define PingLoader_h
34
35#include "ResourceHandleClient.h"
36#include "Timer.h"
37#include <wtf/Noncopyable.h>
38#include <wtf/RefPtr.h>
39
40namespace WebCore {
41
42class Frame;
43class KURL;
44class ResourceError;
45class ResourceHandle;
46class ResourceResponse;
47
48// This class triggers asynchronous loads independent of Frame staying alive (i.e., auditing pingbacks).
49// Since nothing depends on resources loaded through this class, we just want
50// to allow the load to live long enough to ensure the message was actually sent.
51// Therefore, as soon as a callback is received from the ResourceHandle, this class
52// will cancel the load and delete itself.
53class PingLoader : private ResourceHandleClient {
54    WTF_MAKE_NONCOPYABLE(PingLoader); WTF_MAKE_FAST_ALLOCATED;
55public:
56    static void loadImage(Frame*, const KURL& url);
57    static void sendPing(Frame*, const KURL& pingURL, const KURL& destinationURL);
58
59    ~PingLoader();
60
61private:
62    PingLoader(Frame*, const ResourceRequest&);
63
64    void didReceiveResponse(ResourceHandle*, const ResourceResponse&) { delete this; }
65    void didReceiveData(ResourceHandle*, const char*, int, int) { delete this; }
66    void didFinishLoading(ResourceHandle*, double) { delete this; }
67    void didFail(ResourceHandle*, const ResourceError&) { delete this; }
68    void timeout(Timer<PingLoader>*) { delete this; }
69    bool shouldUseCredentialStorage(ResourceHandle*) { return m_shouldUseCredentialStorage; }
70
71    RefPtr<ResourceHandle> m_handle;
72    Timer<PingLoader> m_timeout;
73    bool m_shouldUseCredentialStorage;
74};
75
76}
77
78#endif
79