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/*
* Copyright (C) 2009, 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CrossThreadCopier_h
#define CrossThreadCopier_h
#include <wtf/Assertions.h>
#include <wtf/Forward.h>
#include <wtf/PassOwnPtr.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefPtr.h>
#include <wtf/Threading.h>
#include <wtf/TypeTraits.h>
namespace WebCore {
class IntRect;
class IntSize;
class KURL;
class ResourceError;
class ResourceRequest;
class ResourceResponse;
struct CrossThreadResourceResponseData;
struct CrossThreadResourceRequestData;
struct ThreadableLoaderOptions;
template<typename T> struct CrossThreadCopierPassThrough {
typedef T Type;
static Type copy(const T& parameter)
{
return parameter;
}
};
template<bool isConvertibleToInteger, bool isThreadSafeRefCounted, typename T> struct CrossThreadCopierBase;
// Integers get passed through without any changes.
template<typename T> struct CrossThreadCopierBase<true, false, T> : public CrossThreadCopierPassThrough<T> {
};
// To allow a type to be passed across threads using its copy constructor, add a forward declaration of the type and
// a CopyThreadCopierBase<false, false, TypeName> : public CrossThreadCopierPassThrough<TypeName> { }; to this file.
template<> struct CrossThreadCopierBase<false, false, ThreadableLoaderOptions> : public CrossThreadCopierPassThrough<ThreadableLoaderOptions> {
};
template<> struct CrossThreadCopierBase<false, false, IntRect> : public CrossThreadCopierPassThrough<IntRect> {
};
template<> struct CrossThreadCopierBase<false, false, IntSize> : public CrossThreadCopierPassThrough<IntSize> {
};
// Custom copy methods.
template<typename T> struct CrossThreadCopierBase<false, true, T> {
typedef typename WTF::RemoveTemplate<T, RefPtr>::Type TypeWithoutRefPtr;
typedef typename WTF::RemoveTemplate<TypeWithoutRefPtr, PassRefPtr>::Type TypeWithoutPassRefPtr;
typedef typename WTF::RemovePointer<TypeWithoutPassRefPtr>::Type RefCountedType;
// Verify that only one of the above did a change.
COMPILE_ASSERT((WTF::IsSameType<RefPtr<RefCountedType>, T>::value
|| WTF::IsSameType<PassRefPtr<RefCountedType>, T>::value
|| WTF::IsSameType<RefCountedType*, T>::value),
OnlyAllowOneTypeModification);
typedef PassRefPtr<RefCountedType> Type;
static Type copy(const T& refPtr)
{
return refPtr;
}
};
template<typename T> struct CrossThreadCopierBase<false, false, PassOwnPtr<T> > {
typedef PassOwnPtr<T> Type;
static Type copy(Type ownPtr)
{
return ownPtr;
}
};
template<> struct CrossThreadCopierBase<false, false, KURL> {
typedef KURL Type;
static Type copy(const KURL&);
};
template<> struct CrossThreadCopierBase<false, false, String> {
typedef String Type;
static Type copy(const String&);
};
template<> struct CrossThreadCopierBase<false, false, ResourceError> {
typedef ResourceError Type;
static Type copy(const ResourceError&);
};
template<> struct CrossThreadCopierBase<false, false, ResourceRequest> {
typedef PassOwnPtr<CrossThreadResourceRequestData> Type;
static Type copy(const ResourceRequest&);
};
template<> struct CrossThreadCopierBase<false, false, ResourceResponse> {
typedef PassOwnPtr<CrossThreadResourceResponseData> Type;
static Type copy(const ResourceResponse&);
};
template<typename T> struct CrossThreadCopier : public CrossThreadCopierBase<WTF::IsConvertibleToInteger<T>::value,
WTF::IsSubclassOfTemplate<typename WTF::RemoveTemplate<T, RefPtr>::Type, ThreadSafeRefCounted>::value
|| WTF::IsSubclassOfTemplate<typename WTF::RemovePointer<T>::Type, ThreadSafeRefCounted>::value
|| WTF::IsSubclassOfTemplate<typename WTF::RemoveTemplate<T, PassRefPtr>::Type, ThreadSafeRefCounted>::value,
T> {
};
template<typename T> struct AllowCrossThreadAccessWrapper {
public:
explicit AllowCrossThreadAccessWrapper(T* value) : m_value(value) { }
T* value() const { return m_value; }
private:
T* m_value;
};
template<typename T> struct CrossThreadCopierBase<false, false, AllowCrossThreadAccessWrapper<T> > {
typedef T* Type;
static Type copy(const AllowCrossThreadAccessWrapper<T>& wrapper) { return wrapper.value(); }
};
template<typename T> AllowCrossThreadAccessWrapper<T> AllowCrossThreadAccess(T* value)
{
return AllowCrossThreadAccessWrapper<T>(value);
}
// FIXME: Move to a different header file. AllowAccessLater is for cross-thread access
// that is not cross-thread (tasks posted to a queue guaranteed to run on the same thread).
template<typename T> struct AllowAccessLaterWrapper {
public:
explicit AllowAccessLaterWrapper(T* value) : m_value(value) { }
T* value() const { return m_value; }
private:
T* m_value;
};
template<typename T> struct CrossThreadCopierBase<false, false, AllowAccessLaterWrapper<T> > {
typedef T* Type;
static Type copy(const AllowAccessLaterWrapper<T>& wrapper) { return wrapper.value(); }
};
template<typename T> AllowAccessLaterWrapper<T> AllowAccessLater(T* value)
{
return AllowAccessLaterWrapper<T>(value);
}
} // namespace WebCore
#endif // CrossThreadCopier_h
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