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/*
* Copyright (C) 2013 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE, INC. ``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 APPLE INC. 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 AsyncRequest_h
#define AsyncRequest_h
#include <functional>
#include <wtf/HashMap.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
namespace WebKit {
class AsyncRequest : public RefCounted<AsyncRequest> {
public:
virtual ~AsyncRequest();
uint64_t requestID() { return m_requestID; }
void setAbortHandler(std::function<void ()>);
void requestAborted();
template<typename... Arguments> void completeRequest(Arguments&&... arguments);
protected:
explicit AsyncRequest(std::function<void ()> abortHandler);
virtual void clearCompletionHandler() = 0;
std::function<void ()> m_abortHandler;
private:
uint64_t m_requestID;
};
template <typename... Arguments>
class AsyncRequestImpl final : public AsyncRequest {
public:
template<typename T> using ArgumentType = typename std::conditional<std::is_integral<T>::value, T, const T&>::type;
static Ref<AsyncRequest> create(std::function<void(ArgumentType<Arguments>...)> completionHandler)
{
return adoptRef(*new AsyncRequestImpl<Arguments...>(WTFMove(completionHandler), nullptr));
}
static Ref<AsyncRequest> create(std::function<void(ArgumentType<Arguments>...)> completionHandler, std::function<void()> abortHandler)
{
return adoptRef(*new AsyncRequestImpl<Arguments...>(WTFMove(completionHandler), WTFMove(abortHandler)));
}
virtual ~AsyncRequestImpl()
{
ASSERT(!m_completionHandler);
}
template<typename... RequestArguments>
void completeRequest(RequestArguments&&... arguments)
{
m_completionHandler(std::forward<RequestArguments>(arguments)...);
m_completionHandler = nullptr;
}
private:
AsyncRequestImpl(std::function<void (ArgumentType<Arguments>...)> completionHandler, std::function<void ()> abortHandler)
: AsyncRequest(WTFMove(abortHandler))
, m_completionHandler(WTFMove(completionHandler))
{
ASSERT(m_completionHandler);
}
virtual void clearCompletionHandler() override
{
m_completionHandler = nullptr;
}
std::function<void (ArgumentType<Arguments>...)> m_completionHandler;
};
template<typename... Arguments> void AsyncRequest::completeRequest(Arguments&&... arguments)
{
auto* request = static_cast<AsyncRequestImpl<typename std::decay<Arguments>::type...>*>(this);
request->completeRequest(std::forward<Arguments>(arguments)...);
m_abortHandler = nullptr;
}
class AsyncRequestMap {
public:
AsyncRequestMap()
#ifndef NDEBUG
: m_lastRequestIDTaken(std::numeric_limits<uint64_t>::max())
#endif
{ }
Ref<AsyncRequest> take(uint64_t requestID)
{
#ifndef NDEBUG
ASSERT_WITH_MESSAGE(requestID != m_lastRequestIDTaken, "Attempt to take the same AsyncRequest twice in a row. A background queue might have dispatched both an error callback and a success callback?");
m_lastRequestIDTaken = requestID;
#endif
RefPtr<AsyncRequest> request = m_requestMap.take(requestID);
RELEASE_ASSERT(request);
return adoptRef(*request.leakRef());
}
void add(uint64_t requestID, PassRefPtr<AsyncRequest> request)
{
m_requestMap.add(requestID, request);
}
void clear()
{
m_requestMap.clear();
}
WTF::IteratorRange<HashMap<uint64_t, RefPtr<AsyncRequest>>::iterator::Values> values()
{
return m_requestMap.values();
}
private:
HashMap<uint64_t, RefPtr<AsyncRequest>> m_requestMap;
#ifndef NDEBUG
uint64_t m_lastRequestIDTaken;
#endif
};
} // namespace WebKit
#endif // AsyncRequest_h
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