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/*
* Copyright (C) 2010 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. AND ITS 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 APPLE INC. OR ITS 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 GenericCallback_h
#define GenericCallback_h
#include "APIError.h"
#include "APISerializedScriptValue.h"
#include "ProcessThrottler.h"
#include "ShareableBitmap.h"
#include "WKAPICast.h"
#include <functional>
#include <wtf/HashMap.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/RunLoop.h>
namespace WebKit {
class CallbackBase : public RefCounted<CallbackBase> {
public:
enum class Error {
None,
Unknown,
ProcessExited,
OwnerWasInvalidated,
};
virtual ~CallbackBase()
{
}
uint64_t callbackID() const { return m_callbackID; }
template<class T>
T* as()
{
if (T::type() == m_type)
return static_cast<T*>(this);
return nullptr;
}
virtual void invalidate(Error) = 0;
protected:
struct TypeTag { };
typedef const TypeTag* Type;
explicit CallbackBase(Type type, const ProcessThrottler::BackgroundActivityToken& activityToken)
: m_type(type)
, m_callbackID(generateCallbackID())
, m_activityToken(activityToken)
{
}
private:
static uint64_t generateCallbackID()
{
ASSERT(RunLoop::isMain());
static uint64_t uniqueCallbackID = 1;
return uniqueCallbackID++;
}
Type m_type;
uint64_t m_callbackID;
ProcessThrottler::BackgroundActivityToken m_activityToken;
};
template<typename... T>
class GenericCallback : public CallbackBase {
public:
typedef std::function<void (T..., Error)> CallbackFunction;
static PassRefPtr<GenericCallback> create(CallbackFunction callback, const ProcessThrottler::BackgroundActivityToken& activityToken = nullptr)
{
return adoptRef(new GenericCallback(callback, activityToken));
}
virtual ~GenericCallback()
{
ASSERT(!m_callback);
}
void performCallbackWithReturnValue(T... returnValue)
{
if (!m_callback)
return;
m_callback(returnValue..., Error::None);
m_callback = nullptr;
}
void performCallback()
{
performCallbackWithReturnValue();
}
virtual void invalidate(Error error = Error::Unknown) override final
{
if (!m_callback)
return;
m_callback(typename std::remove_reference<T>::type()..., error);
m_callback = nullptr;
}
private:
GenericCallback(CallbackFunction callback, const ProcessThrottler::BackgroundActivityToken& activityToken)
: CallbackBase(type(), activityToken)
, m_callback(callback)
{
}
friend class CallbackBase;
static Type type()
{
static TypeTag tag;
return &tag;
}
CallbackFunction m_callback;
};
template<typename APIReturnValueType, typename InternalReturnValueType = typename APITypeInfo<APIReturnValueType>::ImplType*>
static typename GenericCallback<InternalReturnValueType>::CallbackFunction toGenericCallbackFunction(void* context, void (*callback)(APIReturnValueType, WKErrorRef, void*))
{
return [context, callback](InternalReturnValueType returnValue, CallbackBase::Error error) {
callback(toAPI(returnValue), error != CallbackBase::Error::None ? toAPI(API::Error::create().ptr()) : 0, context);
};
}
typedef GenericCallback<> VoidCallback;
typedef GenericCallback<const Vector<WebCore::IntRect>&, double> ComputedPagesCallback;
typedef GenericCallback<const ShareableBitmap::Handle&> ImageCallback;
template<typename T>
void invalidateCallbackMap(HashMap<uint64_t, T>& callbackMap, CallbackBase::Error error)
{
Vector<T> callbacks;
copyValuesToVector(callbackMap, callbacks);
for (auto& callback : callbacks)
callback->invalidate(error);
callbackMap.clear();
}
class CallbackMap {
public:
uint64_t put(PassRefPtr<CallbackBase> callback)
{
ASSERT(!m_map.contains(callback->callbackID()));
uint64_t callbackID = callback->callbackID();
m_map.set(callbackID, callback);
return callbackID;
}
template<unsigned I, typename T, typename... U>
struct GenericCallbackType {
typedef typename GenericCallbackType<I - 1, U..., T>::type type;
};
template<typename... U>
struct GenericCallbackType<1, CallbackBase::Error, U...> {
typedef GenericCallback<U...> type;
};
template<typename... T>
uint64_t put(std::function<void (T...)> function, const ProcessThrottler::BackgroundActivityToken& activityToken)
{
auto callback = GenericCallbackType<sizeof...(T), T...>::type::create(WTFMove(function), activityToken);
return put(callback);
}
template<class T>
RefPtr<T> take(uint64_t callbackID)
{
RefPtr<CallbackBase> base = m_map.take(callbackID);
if (!base)
return nullptr;
return adoptRef(base.release().leakRef()->as<T>());
}
void invalidate(CallbackBase::Error error)
{
invalidateCallbackMap(m_map, error);
}
private:
HashMap<uint64_t, RefPtr<CallbackBase>> m_map;
};
} // namespace WebKit
#endif // GenericCallback_h
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