Source/WebCore/platform/CrossThreadCopier.cpp

/*
 * Copyright (C) 2009 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 * in the documentation and/or other materials provided with the
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 *
 * 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
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#include "config.h"

#include "CrossThreadCopier.h"

#include "URL.h"
#include "ResourceError.h"
#include "ResourceRequest.h"
#include "ResourceResponse.h"
#include "SecurityOriginData.h"
#include "SerializedScriptValue.h"
#include "SessionID.h"
#include "ThreadSafeDataBuffer.h"
#include <wtf/Assertions.h>
#include <wtf/text/WTFString.h>

namespace WebCore {

CrossThreadCopierBase<false, false, URL>::Type CrossThreadCopierBase<false, false, URL>::copy(const URL& url)
{
    return url.isolatedCopy();
}

CrossThreadCopierBase<false, false, String>::Type CrossThreadCopierBase<false, false, String>::copy(const String& str)
{
    return str.isolatedCopy();
}

CrossThreadCopierBase<false, false, ResourceError>::Type CrossThreadCopierBase<false, false, ResourceError>::copy(const ResourceError& error)
{
    return error.copy();
}

CrossThreadCopierBase<false, false, ResourceRequest>::Type CrossThreadCopierBase<false, false, ResourceRequest>::copy(const ResourceRequest& request)
{
    return request.copyData();
}

CrossThreadCopierBase<false, false, ResourceResponse>::Type CrossThreadCopierBase<false, false, ResourceResponse>::copy(const ResourceResponse& response)
{
    return response.copyData();
}

CrossThreadCopierBase<false, false, SecurityOriginData>::Type CrossThreadCopierBase<false, false, SecurityOriginData>::copy(const SecurityOriginData& originData)
{
    return originData.isolatedCopy();
}

CrossThreadCopierBase<false, false, SessionID>::Type CrossThreadCopierBase<false, false, SessionID>::copy(const SessionID& sessionID)
{
    return sessionID;
}

CrossThreadCopierBase<false, false, ThreadSafeDataBuffer>::Type CrossThreadCopierBase<false, false, ThreadSafeDataBuffer>::copy(const ThreadSafeDataBuffer& buffer)
{
    return ThreadSafeDataBuffer(buffer);
}

// Test CrossThreadCopier using COMPILE_ASSERT.

// Verify that ThreadSafeRefCounted objects get handled correctly.
class CopierThreadSafeRefCountedTest : public ThreadSafeRefCounted<CopierThreadSafeRefCountedTest> {
};

COMPILE_ASSERT((std::is_same<
                  PassRefPtr<CopierThreadSafeRefCountedTest>,
                  CrossThreadCopier<PassRefPtr<CopierThreadSafeRefCountedTest>>::Type
                  >::value),
               PassRefPtrTest);
COMPILE_ASSERT((std::is_same<
                  PassRefPtr<CopierThreadSafeRefCountedTest>,
                  CrossThreadCopier<RefPtr<CopierThreadSafeRefCountedTest>>::Type
                  >::value),
               RefPtrTest);
COMPILE_ASSERT((std::is_same<
                  PassRefPtr<CopierThreadSafeRefCountedTest>,
                  CrossThreadCopier<CopierThreadSafeRefCountedTest*>::Type
                  >::value),
               RawPointerTest);

// Add specializations for RefCounted types which will let us verify that no other template matches.
template<typename T> struct CrossThreadCopierBase<false, false, RefPtr<T>> {
    typedef int Type;
};

template<typename T> struct CrossThreadCopierBase<false, false, PassRefPtr<T>> {
    typedef int Type;
};

template<typename T> struct CrossThreadCopierBase<false, false, T*> {
    typedef int Type;
};

// Verify that RefCounted objects only match the above templates which expose Type as int.
class CopierRefCountedTest : public RefCounted<CopierRefCountedTest> {
};

static_assert((std::is_same<int, CrossThreadCopier<PassRefPtr<CopierRefCountedTest>>::Type>::value), "CrossThreadCopier specialization improperly applied to PassRefPtr<> of a RefCounted (but not ThreadSafeRefCounted) type");
static_assert((std::is_same<int, CrossThreadCopier<RefPtr<CopierRefCountedTest>>::Type>::value), "CrossThreadCopier specialization improperly applied to RefPtr<> of a RefCounted (but not ThreadSafeRefCounted) type");
static_assert((std::is_same<int, CrossThreadCopier<CopierRefCountedTest*>::Type>::value), "CrossThreadCopier specialization improperly applied to raw pointer of a RefCounted (but not ThreadSafeRefCounted) type");

} // namespace WebCore