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      1 /*
      2  * Copyright (C) 2011 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 LinkLoader_h
     33 #define LinkLoader_h
     34 
     35 #include "core/fetch/ResourceClient.h"
     36 #include "core/fetch/ResourceOwner.h"
     37 #include "core/loader/LinkLoaderClient.h"
     38 #include "platform/PrerenderClient.h"
     39 #include "platform/Timer.h"
     40 #include "wtf/OwnPtr.h"
     41 
     42 namespace blink {
     43 
     44 class Document;
     45 class LinkRelAttribute;
     46 class PrerenderHandle;
     47 
     48 // The LinkLoader can load link rel types icon, dns-prefetch, subresource, prefetch and prerender.
     49 class LinkLoader FINAL : public ResourceOwner<Resource, ResourceClient>, public PrerenderClient {
     50 
     51 public:
     52     explicit LinkLoader(LinkLoaderClient*);
     53     virtual ~LinkLoader();
     54 
     55     // from ResourceClient
     56     virtual void notifyFinished(Resource*) OVERRIDE;
     57 
     58     // from PrerenderClient
     59     virtual void didStartPrerender() OVERRIDE;
     60     virtual void didStopPrerender() OVERRIDE;
     61     virtual void didSendLoadForPrerender() OVERRIDE;
     62     virtual void didSendDOMContentLoadedForPrerender() OVERRIDE;
     63 
     64     void released();
     65     bool loadLink(const LinkRelAttribute&, const AtomicString& crossOriginMode, const String& type, const KURL&, Document&);
     66 
     67 private:
     68     void linkLoadTimerFired(Timer<LinkLoader>*);
     69     void linkLoadingErrorTimerFired(Timer<LinkLoader>*);
     70 
     71     LinkLoaderClient* m_client;
     72 
     73     Timer<LinkLoader> m_linkLoadTimer;
     74     Timer<LinkLoader> m_linkLoadingErrorTimer;
     75 
     76     OwnPtr<PrerenderHandle> m_prerender;
     77 };
     78 
     79 }
     80 
     81 #endif
     82