CrossThreadCopier.cpp   [plain text]

/*
 * Copyright (C) 2009 Google Inc. All rights reserved.
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 * in the documentation and/or other materials provided with the
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 * 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,
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 */

#include "config.h"

#include "CrossThreadCopier.h"

#include "KURL.h"
#include "PlatformString.h"
#include "ResourceError.h"
#include "ResourceRequest.h"
#include "ResourceResponse.h"
#include "SerializedScriptValue.h"

#include <wtf/Assertions.h>

namespace WebCore {

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

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();
}

// Test CrossThreadCopier using COMPILE_ASSERT.

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

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


// Add a generic specialization which will let's us verify that no other template matches.
template<typename T> struct CrossThreadCopierBase<false, false, T> {
    typedef int Type;
};

// Verify that RefCounted objects only match our generic template which exposes Type as int.
class CopierRefCountedTest : public RefCounted<CopierRefCountedTest> {
};

COMPILE_ASSERT((WTF::IsSameType<
                  int,
                  CrossThreadCopier<PassRefPtr<CopierRefCountedTest> >::Type
                  >::value),
               PassRefPtrRefCountedTest);

COMPILE_ASSERT((WTF::IsSameType<
                  int,
                  CrossThreadCopier<RefPtr<CopierRefCountedTest> >::Type
                  >::value),
               RefPtrRefCountedTest);

COMPILE_ASSERT((WTF::IsSameType<
                  int,
                  CrossThreadCopier<CopierRefCountedTest*>::Type
                  >::value),
               RawPointerRefCountedTest);

// Verify that PassOwnPtr gets passed through.
COMPILE_ASSERT((WTF::IsSameType<
                  PassOwnPtr<float>,
                  CrossThreadCopier<PassOwnPtr<float> >::Type
                  >::value),
               PassOwnPtrTest);

// Verify that PassOwnPtr does not get passed through.
COMPILE_ASSERT((WTF::IsSameType<
                  int,
                  CrossThreadCopier<OwnPtr<float> >::Type
                  >::value),
               OwnPtrTest);

} // namespace WebCore