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/*
* Copyright 2010, The Android Open Source Project
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``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 ANDROID_WEBKIT_MESSAGETYPES_H_
#define ANDROID_WEBKIT_MESSAGETYPES_H_
#include <wtf/CurrentTime.h>
// TODO(phanna): autogenerate these types!
namespace android {
// Forward declared for friendship!
class MessageQueue;
// Removes the reference from the typename so we store the actual value in the
// closure.
template <typename T> struct remove_reference { typedef T type; };
template <typename T> struct remove_reference<T&> { typedef T type; };
// Prevent the compiler from inferring the type.
template <typename T> struct identity { typedef T type; };
// Message base class. Defines the public run() method and contains generic
// object and member function variables for use in MessageQueue.
//
// Note: The template subclass MemberFunctionMessage casts its object and
// member function to the generic void* and Message::* types. During run(),
// each template specialization downcasts to the original type and invokes the
// correct function. This may seem dangerous but the compiler enforces
// correctness in NewMessage and in the template constructor.
class Message {
public:
typedef void (Message::*GenericMemberFunction)(void);
virtual ~Message() {}
virtual void run() = 0;
// The wall time that the message is supposed to run.
double m_when;
void* object() const { return m_object; }
GenericMemberFunction member() const { return m_member; }
protected:
Message(void* object, GenericMemberFunction member, long delay = 0)
: m_object(object)
, m_member(member) {
m_when = WTF::currentTimeMS() + delay;
}
// Downcast back to the original template params in run(). Also accessed
// by MessageQueue to compare messages.
void* m_object;
GenericMemberFunction m_member;
private:
// Disallow copy
Message(const Message&);
};
// Forward declaration for partial specialization.
template <class T, typename A1>
class MemberFunctionMessage;
template <class T>
class MemberFunctionMessage<T, void> : public Message {
private:
typedef void (T::*MemberSignature)();
public:
inline MemberFunctionMessage(T* object,
MemberSignature member,
long delay = 0)
: Message(reinterpret_cast<void*>(object),
reinterpret_cast<GenericMemberFunction>(member),
delay) {}
virtual void run() {
MemberSignature member = reinterpret_cast<MemberSignature>(m_member);
(reinterpret_cast<T*>(m_object)->*member)();
delete this;
}
};
template <class T>
inline Message* NewMessage(T* object, void (T::*member)()) {
return new MemberFunctionMessage<T, void>(object, member);
}
template <class T>
inline Message* NewDelayedMessage(T* object, void (T::*member)(), long delay) {
return new MemberFunctionMessage<T, void>(object, member, delay);
}
template <class T, typename A1>
class MemberFunctionMessage : public Message {
private:
typedef void (T::*MemberSignature)(A1);
public:
inline MemberFunctionMessage(T* object,
MemberSignature member,
A1 arg1,
long delay = 0)
: Message(reinterpret_cast<void*>(object),
reinterpret_cast<GenericMemberFunction>(member),
delay)
, m_arg1(arg1) {}
virtual void run() {
MemberSignature member = reinterpret_cast<MemberSignature>(m_member);
(reinterpret_cast<T*>(m_object)->*member)(m_arg1);
delete this;
}
private:
typename remove_reference<A1>::type m_arg1;
};
template <class T, typename A1>
inline Message* NewMessage(T* object, void (T::*member)(A1),
typename identity<A1>::type arg1) {
return new MemberFunctionMessage<T, A1>(
object, member, arg1);
}
template <class T, typename A1>
inline Message* NewDelayedMessage(T* object, void (T::*member)(A1),
typename identity<A1>::type arg1, long delay) {
return new MemberFunctionMessage<T, A1>(object, member, arg1, delay);
}
} // namespace android
#endif // ANDROID_WEBKIT_MESSAGETYPES_H_
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