Source/WebCore/loader/PingLoader.h

/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 * in the documentation and/or other materials provided with the
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#ifndef PingLoader_h
#define PingLoader_h

#include "ResourceHandleClient.h"
#include "Timer.h"
#include <wtf/Noncopyable.h>
#include <wtf/RefPtr.h>

namespace WebCore {

class FormData;
class Frame;
class URL;
class ResourceError;
class ResourceHandle;
class ResourceResponse;

// This class triggers asynchronous loads independent of Frame staying alive (i.e., auditing pingbacks).
// Since nothing depends on resources loaded through this class, we just want
// to allow the load to live long enough to ensure the message was actually sent.
// Therefore, as soon as a callback is received from the ResourceHandle, this class 
// will cancel the load and delete itself.
class PingLoader : private ResourceHandleClient {
    WTF_MAKE_NONCOPYABLE(PingLoader); WTF_MAKE_FAST_ALLOCATED;
public:
    static void loadImage(Frame&, const URL&);
    static void sendPing(Frame&, const URL& pingURL, const URL& destinationURL);
    static void sendViolationReport(Frame&, const URL& reportURL, PassRefPtr<FormData> report);

    virtual ~PingLoader();

private:
    static void createPingLoader(Frame&, ResourceRequest&);
    PingLoader(Frame&, ResourceRequest&);

    virtual void didReceiveResponse(ResourceHandle*, const ResourceResponse&) override { delete this; }
    virtual void didReceiveData(ResourceHandle*, const char*, unsigned, int) override { delete this; }
    virtual void didFinishLoading(ResourceHandle*, double) override { delete this; }
    virtual void didFail(ResourceHandle*, const ResourceError&) override { delete this; }
    virtual bool shouldUseCredentialStorage(ResourceHandle*)  override { return m_shouldUseCredentialStorage; }
    void timeoutTimerFired(Timer<PingLoader>&) { delete this; }

    RefPtr<ResourceHandle> m_handle;
    Timer<PingLoader> m_timeout;
    bool m_shouldUseCredentialStorage;
};

}

#endif