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      1 /*
      2  * Copyright (C) 2009, 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 #ifndef WebURLLoader_h
     32 #define WebURLLoader_h
     33 
     34 #include "WebCommon.h"
     35 #include "WebURLRequest.h"
     36 
     37 namespace blink {
     38 
     39 class WebData;
     40 class WebURLLoaderClient;
     41 class WebURLResponse;
     42 struct WebURLError;
     43 
     44 class WebURLLoader {
     45 public:
     46     // The WebURLLoader may be deleted in a call to its client.
     47     virtual ~WebURLLoader() {}
     48 
     49     // Load the request synchronously, returning results directly to the
     50     // caller upon completion.  There is no mechanism to interrupt a
     51     // synchronous load!!
     52     virtual void loadSynchronously(const WebURLRequest&,
     53         WebURLResponse&, WebURLError&, WebData& data) = 0;
     54 
     55     // Load the request asynchronously, sending notifications to the given
     56     // client.  The client will receive no further notifications if the
     57     // loader is disposed before it completes its work.
     58     virtual void loadAsynchronously(const WebURLRequest&,
     59         WebURLLoaderClient*) = 0;
     60 
     61     // Cancels an asynchronous load.  This will appear as a load error to
     62     // the client.
     63     virtual void cancel() = 0;
     64 
     65     // Suspends/resumes an asynchronous load.
     66     virtual void setDefersLoading(bool) = 0;
     67 
     68     // Notifies the loader that the priority of a WebURLRequest has changed from
     69     // its previous value. For example, a preload request starts with low
     70     // priority, but may increase when the resource is needed for rendering.
     71     virtual void didChangePriority(WebURLRequest::Priority newPriority) { }
     72 };
     73 
     74 } // namespace blink
     75 
     76 #endif
     77