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 WebThreadedDataReceiver; 41 class WebURLLoaderClient; 42 class WebURLResponse; 43 struct WebURLError; 44 45 class WebURLLoader { 46 public: 47 // The WebURLLoader may be deleted in a call to its client. 48 virtual ~WebURLLoader() {} 49 50 // Load the request synchronously, returning results directly to the 51 // caller upon completion. There is no mechanism to interrupt a 52 // synchronous load!! 53 virtual void loadSynchronously(const WebURLRequest&, 54 WebURLResponse&, WebURLError&, WebData& data) = 0; 55 56 // Load the request asynchronously, sending notifications to the given 57 // client. The client will receive no further notifications if the 58 // loader is disposed before it completes its work. 59 virtual void loadAsynchronously(const WebURLRequest&, 60 WebURLLoaderClient*) = 0; 61 62 // Cancels an asynchronous load. This will appear as a load error to 63 // the client. 64 virtual void cancel() = 0; 65 66 // Suspends/resumes an asynchronous load. 67 virtual void setDefersLoading(bool) = 0; 68 69 // Notifies the loader that the priority of a WebURLRequest has changed from 70 // its previous value. For example, a preload request starts with low 71 // priority, but may increase when the resource is needed for rendering. 72 virtual void didChangePriority(WebURLRequest::Priority newPriority) { } 73 virtual void didChangePriority(WebURLRequest::Priority newPriority, int intraPriorityValue) { didChangePriority(newPriority); } 74 75 // Try to attach the given data receiver which from this point will receive data 76 // on its thread (provided by WebThreadedDataReceiver::backgroundThread(), 77 // rather than the WebURLLoaderClient. If successful, ownership 78 // of the data receiver is assumed by the WebURLLoader and the receiver should 79 // be deleted on the main thread when no longer needed. 80 virtual bool attachThreadedDataReceiver(WebThreadedDataReceiver*) { return false; } 81 }; 82 83 } // namespace blink 84 85 #endif 86
