1 /* 2 * Copyright (C) 2009, 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 #ifndef CrossThreadCopier_h 32 #define CrossThreadCopier_h 33 34 #include <wtf/Forward.h> 35 #include <wtf/PassOwnPtr.h> 36 #include <wtf/PassRefPtr.h> 37 #include <wtf/RefPtr.h> 38 #include <wtf/Threading.h> 39 #include <wtf/TypeTraits.h> 40 41 namespace WebCore { 42 43 class KURL; 44 class ResourceError; 45 class ResourceRequest; 46 class ResourceResponse; 47 struct CrossThreadResourceResponseData; 48 struct CrossThreadResourceRequestData; 49 struct ThreadableLoaderOptions; 50 51 template<typename T> struct CrossThreadCopierPassThrough { 52 typedef T Type; copyCrossThreadCopierPassThrough53 static Type copy(const T& parameter) 54 { 55 return parameter; 56 } 57 }; 58 59 template<bool isConvertibleToInteger, bool isThreadSafeRefCounted, typename T> struct CrossThreadCopierBase; 60 61 // Integers get passed through without any changes. 62 template<typename T> struct CrossThreadCopierBase<true, false, T> : public CrossThreadCopierPassThrough<T> { 63 }; 64 65 // Pointers get passed through without any significant changes. 66 template<typename T> struct CrossThreadCopierBase<false, false, T*> : public CrossThreadCopierPassThrough<T*> { 67 }; 68 69 template<> struct CrossThreadCopierBase<false, false, ThreadableLoaderOptions> : public CrossThreadCopierPassThrough<ThreadableLoaderOptions> { 70 }; 71 72 // Custom copy methods. 73 template<typename T> struct CrossThreadCopierBase<false, true, T> { 74 typedef typename WTF::RemoveTemplate<T, RefPtr>::Type TypeWithoutRefPtr; 75 typedef typename WTF::RemoveTemplate<TypeWithoutRefPtr, PassRefPtr>::Type RefCountedType; 76 typedef PassRefPtr<RefCountedType> Type; 77 static Type copy(const T& refPtr) 78 { 79 return refPtr.get(); 80 } 81 }; 82 83 template<typename T> struct CrossThreadCopierBase<false, false, PassOwnPtr<T> > { 84 typedef PassOwnPtr<T> Type; 85 static Type copy(Type ownPtr) 86 { 87 return ownPtr; 88 } 89 }; 90 91 template<> struct CrossThreadCopierBase<false, false, KURL> { 92 typedef KURL Type; 93 static Type copy(const KURL&); 94 }; 95 96 template<> struct CrossThreadCopierBase<false, false, String> { 97 typedef String Type; 98 static Type copy(const String&); 99 }; 100 101 template<> struct CrossThreadCopierBase<false, false, ResourceError> { 102 typedef ResourceError Type; 103 static Type copy(const ResourceError&); 104 }; 105 106 template<> struct CrossThreadCopierBase<false, false, ResourceRequest> { 107 typedef PassOwnPtr<CrossThreadResourceRequestData> Type; 108 static Type copy(const ResourceRequest&); 109 }; 110 111 template<> struct CrossThreadCopierBase<false, false, ResourceResponse> { 112 typedef PassOwnPtr<CrossThreadResourceResponseData> Type; 113 static Type copy(const ResourceResponse&); 114 }; 115 116 template<typename T> struct CrossThreadCopier : public CrossThreadCopierBase<WTF::IsConvertibleToInteger<T>::value, 117 WTF::IsSubclassOfTemplate<typename WTF::RemoveTemplate<T, RefPtr>::Type, ThreadSafeRefCounted>::value 118 || WTF::IsSubclassOfTemplate<typename WTF::RemoveTemplate<T, PassRefPtr>::Type, ThreadSafeRefCounted>::value, 119 T> { 120 }; 121 122 } // namespace WebCore 123 124 #endif // CrossThreadCopier_h 125