• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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