text: /*
   * libjingle
   * Copyright 2013 Google Inc.
   *
   * 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.
   *  3. The name of the author may not be used to endorse or promote products
   *     derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
   */
  
  // This file contains Macros for creating proxies for webrtc MediaStream and
  // PeerConnection classes.
  
  //
  // Example usage:
  //
  // class TestInterface : public rtc::RefCountInterface {
  //  public:
  //   std::string FooA() = 0;
  //   std::string FooB(bool arg1) const = 0;
  //   std::string FooC(bool arg1)= 0;
  //  };
  //
  // Note that return types can not be a const reference.
  //
  // class Test : public TestInterface {
  // ... implementation of the interface.
  // };
  //
  // BEGIN_PROXY_MAP(Test)
  //   PROXY_METHOD0(std::string, FooA)
  //   PROXY_CONSTMETHOD1(std::string, FooB, arg1)
  //   PROXY_METHOD1(std::string, FooC, arg1)
  // END_PROXY()
  //
  // The proxy can be created using TestProxy::Create(Thread*, TestInterface*).
  
  #ifndef TALK_APP_WEBRTC_PROXY_H_
  #define TALK_APP_WEBRTC_PROXY_H_
  
  #include "webrtc/base/event.h"
  #include "webrtc/base/thread.h"
  
  namespace webrtc {
  
  template <typename R>
  class ReturnType {
   public:
    template<typename C, typename M>
    void Invoke(C* c, M m) { r_ = (c->*m)(); }
    template<typename C, typename M, typename T1>
    void Invoke(C* c, M m, T1 a1) { r_ = (c->*m)(a1); }
    template<typename C, typename M, typename T1, typename T2>
    void Invoke(C* c, M m, T1 a1, T2 a2) { r_ = (c->*m)(a1, a2); }
    template<typename C, typename M, typename T1, typename T2, typename T3>
    void Invoke(C* c, M m, T1 a1, T2 a2, T3 a3) { r_ = (c->*m)(a1, a2, a3); }
    template<typename C, typename M, typename T1, typename T2, typename T3,
        typename T4>
    void Invoke(C* c, M m, T1 a1, T2 a2, T3 a3, T4 a4) {
      r_ = (c->*m)(a1, a2, a3, a4);
    }
    template<typename C, typename M, typename T1, typename T2, typename T3,
       typename T4, typename T5>
    void Invoke(C* c, M m, T1 a1, T2 a2, T3 a3, T4 a4, T5 a5) {
      r_ = (c->*m)(a1, a2, a3, a4, a5);
    }
  
    R value() { return r_; }
  
   private:
    R r_;
  };
  
  template <>
  class ReturnType<void> {
   public:
    template<typename C, typename M>
    void Invoke(C* c, M m) { (c->*m)(); }
    template<typename C, typename M, typename T1>
    void Invoke(C* c, M m, T1 a1) { (c->*m)(a1); }
    template<typename C, typename M, typename T1, typename T2>
    void Invoke(C* c, M m, T1 a1, T2 a2) { (c->*m)(a1, a2); }
    template<typename C, typename M, typename T1, typename T2, typename T3>
    void Invoke(C* c, M m, T1 a1, T2 a2, T3 a3) { (c->*m)(a1, a2, a3); }
  
    void value() {}
  };
  
  namespace internal {
  
  class SynchronousMethodCall
      : public rtc::MessageData,
        public rtc::MessageHandler {
   public:
    explicit SynchronousMethodCall(rtc::MessageHandler* proxy)
        : e_(), proxy_(proxy) {}
    ~SynchronousMethodCall() {}
  
    void Invoke(rtc::Thread* t) {
      if (t->IsCurrent()) {
        proxy_->OnMessage(NULL);
      } else {
        e_.reset(new rtc::Event(false, false));
        t->Post(this, 0);
        e_->Wait(rtc::Event::kForever);
      }
    }
  
   private:
    void OnMessage(rtc::Message*) { proxy_->OnMessage(NULL); e_->Set(); }
    rtc::scoped_ptr<rtc::Event> e_;
    rtc::MessageHandler* proxy_;
  };
  
  }  // namespace internal
  
  template <typename C, typename R>
  class MethodCall0 : public rtc::Message,
                      public rtc::MessageHandler {
   public:
    typedef R (C::*Method)();
    MethodCall0(C* c, Method m) : c_(c), m_(m) {}
  
    R Marshal(rtc::Thread* t) {
      internal::SynchronousMethodCall(this).Invoke(t);
      return r_.value();
    }
  
   private:
    void OnMessage(rtc::Message*) {  r_.Invoke(c_, m_); }
  
    C* c_;
    Method m_;
    ReturnType<R> r_;
  };
  
  template <typename C, typename R>
  class ConstMethodCall0 : public rtc::Message,
                           public rtc::MessageHandler {
   public:
    typedef R (C::*Method)() const;
    ConstMethodCall0(C* c, Method m) : c_(c), m_(m) {}
  
    R Marshal(rtc::Thread* t) {
      internal::SynchronousMethodCall(this).Invoke(t);
      return r_.value();
    }
  
   private:
    void OnMessage(rtc::Message*) { r_.Invoke(c_, m_); }
  
    C* c_;
    Method m_;
    ReturnType<R> r_;
  };
  
  template <typename C, typename R,  typename T1>
  class MethodCall1 : public rtc::Message,
                      public rtc::MessageHandler {
   public:
    typedef R (C::*Method)(T1 a1);
    MethodCall1(C* c, Method m, T1 a1) : c_(c), m_(m), a1_(a1) {}
  
    R Marshal(rtc::Thread* t) {
      internal::SynchronousMethodCall(this).Invoke(t);
      return r_.value();
    }
  
   private:
    void OnMessage(rtc::Message*) { r_.Invoke(c_, m_, a1_); }
  
    C* c_;
    Method m_;
    ReturnType<R> r_;
    T1 a1_;
  };
  
  template <typename C, typename R,  typename T1>
  class ConstMethodCall1 : public rtc::Message,
                           public rtc::MessageHandler {
   public:
    typedef R (C::*Method)(T1 a1) const;
    ConstMethodCall1(C* c, Method m, T1 a1) : c_(c), m_(m), a1_(a1) {}
  
    R Marshal(rtc::Thread* t) {
      internal::SynchronousMethodCall(this).Invoke(t);
      return r_.value();
    }
  
   private:
    void OnMessage(rtc::Message*) { r_.Invoke(c_, m_, a1_); }
  
    C* c_;
    Method m_;
    ReturnType<R> r_;
    T1 a1_;
  };
  
  template <typename C, typename R, typename T1, typename T2>
  class MethodCall2 : public rtc::Message,
                      public rtc::MessageHandler {
   public:
    typedef R (C::*Method)(T1 a1, T2 a2);
    MethodCall2(C* c, Method m, T1 a1, T2 a2) : c_(c), m_(m), a1_(a1), a2_(a2) {}
  
    R Marshal(rtc::Thread* t) {
      internal::SynchronousMethodCall(this).Invoke(t);
      return r_.value();
    }
  
   private:
    void OnMessage(rtc::Message*) { r_.Invoke(c_, m_, a1_, a2_); }
  
    C* c_;
    Method m_;
    ReturnType<R> r_;
    T1 a1_;
    T2 a2_;
  };
  
  template <typename C, typename R, typename T1, typename T2, typename T3>
  class MethodCall3 : public rtc::Message,
                      public rtc::MessageHandler {
   public:
    typedef R (C::*Method)(T1 a1, T2 a2, T3 a3);
    MethodCall3(C* c, Method m, T1 a1, T2 a2, T3 a3)
        : c_(c), m_(m), a1_(a1), a2_(a2), a3_(a3) {}
  
    R Marshal(rtc::Thread* t) {
      internal::SynchronousMethodCall(this).Invoke(t);
      return r_.value();
    }
  
   private:
    void OnMessage(rtc::Message*) { r_.Invoke(c_, m_, a1_, a2_, a3_); }
  
    C* c_;
    Method m_;
    ReturnType<R> r_;
    T1 a1_;
    T2 a2_;
    T3 a3_;
  };
  
  template <typename C, typename R, typename T1, typename T2, typename T3,
      typename T4>
  class MethodCall4 : public rtc::Message,
                      public rtc::MessageHandler {
   public:
    typedef R (C::*Method)(T1 a1, T2 a2, T3 a3, T4 a4);
    MethodCall4(C* c, Method m, T1 a1, T2 a2, T3 a3, T4 a4)
        : c_(c), m_(m), a1_(a1), a2_(a2), a3_(a3), a4_(a4) {}
  
    R Marshal(rtc::Thread* t) {
      internal::SynchronousMethodCall(this).Invoke(t);
      return r_.value();
    }
  
   private:
    void OnMessage(rtc::Message*) { r_.Invoke(c_, m_, a1_, a2_, a3_, a4_); }
  
    C* c_;
    Method m_;
    ReturnType<R> r_;
    T1 a1_;
    T2 a2_;
    T3 a3_;
    T4 a4_;
  };
  
  template <typename C, typename R, typename T1, typename T2, typename T3,
      typename T4, typename T5>
  class MethodCall5 : public rtc::Message,
                      public rtc::MessageHandler {
   public:
    typedef R (C::*Method)(T1 a1, T2 a2, T3 a3, T4 a4, T5 a5);
    MethodCall5(C* c, Method m, T1 a1, T2 a2, T3 a3, T4 a4, T5 a5)
        : c_(c), m_(m), a1_(a1), a2_(a2), a3_(a3), a4_(a4), a5_(a5) {}
  
    R Marshal(rtc::Thread* t) {
      internal::SynchronousMethodCall(this).Invoke(t);
      return r_.value();
    }
  
   private:
    void OnMessage(rtc::Message*) { r_.Invoke(c_, m_, a1_, a2_, a3_, a4_, a5_); }
  
    C* c_;
    Method m_;
    ReturnType<R> r_;
    T1 a1_;
    T2 a2_;
    T3 a3_;
    T4 a4_;
    T5 a5_;
  };
  
  #define BEGIN_PROXY_MAP(c) \
    class c##Proxy : public c##Interface {\
     protected:\
      typedef c##Interface C;\
      c##Proxy(rtc::Thread* thread, C* c)\
        : owner_thread_(thread), \
          c_(c)  {}\
      ~c##Proxy() {\
        MethodCall0<c##Proxy, void> call(this, &c##Proxy::Release_s);\
        call.Marshal(owner_thread_);\
      }\
     public:\
      static rtc::scoped_refptr<C> Create(rtc::Thread* thread, \
                                                C* c) {\
        return new rtc::RefCountedObject<c##Proxy>(thread, c);\
      }\
  
  #define PROXY_METHOD0(r, method)\
      r method() OVERRIDE {\
        MethodCall0<C, r> call(c_.get(), &C::method);\
        return call.Marshal(owner_thread_);\
      }\
  
  #define PROXY_CONSTMETHOD0(r, method)\
      r method() const OVERRIDE {\
        ConstMethodCall0<C, r> call(c_.get(), &C::method);\
        return call.Marshal(owner_thread_);\
       }\
  
  #define PROXY_METHOD1(r, method, t1)\
      r method(t1 a1) OVERRIDE {\
        MethodCall1<C, r, t1> call(c_.get(), &C::method, a1);\
        return call.Marshal(owner_thread_);\
      }\
  
  #define PROXY_CONSTMETHOD1(r, method, t1)\
      r method(t1 a1) const OVERRIDE {\
        ConstMethodCall1<C, r, t1> call(c_.get(), &C::method, a1);\
        return call.Marshal(owner_thread_);\
      }\
  
  #define PROXY_METHOD2(r, method, t1, t2)\
      r method(t1 a1, t2 a2) OVERRIDE {\
        MethodCall2<C, r, t1, t2> call(c_.get(), &C::method, a1, a2);\
        return call.Marshal(owner_thread_);\
      }\
  
  #define PROXY_METHOD3(r, method, t1, t2, t3)\
      r method(t1 a1, t2 a2, t3 a3) OVERRIDE {\
        MethodCall3<C, r, t1, t2, t3> call(c_.get(), &C::method, a1, a2, a3);\
        return call.Marshal(owner_thread_);\
      }\
  
  #define PROXY_METHOD4(r, method, t1, t2, t3, t4)\
      r method(t1 a1, t2 a2, t3 a3, t4 a4) OVERRIDE {\
        MethodCall4<C, r, t1, t2, t3, t4> call(\
            c_.get(), &C::method, a1, a2, a3, a4);\
        return call.Marshal(owner_thread_);\
      }\
  
  #define PROXY_METHOD5(r, method, t1, t2, t3, t4, t5)\
      r method(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5) OVERRIDE {\
        MethodCall5<C, r, t1, t2, t3, t4, t5> call(\
            c_.get(), &C::method, a1, a2, a3, a4, a5);\
        return call.Marshal(owner_thread_);\
      }\
  
  #define END_PROXY() \
     private:\
      void Release_s() {\
        c_ = NULL;\
      }\
      mutable rtc::Thread* owner_thread_;\
      rtc::scoped_refptr<C> c_;\
    };\
  
  }  // namespace webrtc
  
  #endif  //  TALK_APP_WEBRTC_PROXY_H_
  