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      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 
     40 namespace WebCore {
     41 
     42 class Frame;
     43 class KURL;
     44 class ResourceError;
     45 class ResourceHandle;
     46 class 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.
     53 class PingLoader : private ResourceHandleClient {
     54     WTF_MAKE_NONCOPYABLE(PingLoader); WTF_MAKE_FAST_ALLOCATED;
     55 public:
     56     static void loadImage(Frame*, const KURL& url);
     57     static void sendPing(Frame*, const KURL& pingURL, const KURL& destinationURL);
     58 
     59     ~PingLoader();
     60 
     61 private:
     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