work_queue.hpp

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#ifndef PROTON_WORK_QUEUE_HPP
#define PROTON_WORK_QUEUE_HPP
 
/*
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 */
 
#include "./duration.hpp"
#include "./fwd.hpp"
#include "./function.hpp"
#include "./internal/export.hpp"
 
#include <functional>
#include <memory>
#include <type_traits>
#include <utility>
 
struct pn_connection_t;
struct pn_session_t;
struct pn_link_t;
 
 
namespace proton {
 
 
namespace internal { namespace v03 {
 
struct invocable {
    invocable() = default;
    virtual ~invocable() = default;
 
    virtual invocable& clone() const = 0;
    virtual void operator() () = 0;
};
 
template <class T>
struct invocable_cloner : invocable {
    virtual ~invocable_cloner() = default;
    virtual invocable& clone() const {
        return *new T(static_cast<T const&>(*this));
    }
};
 
struct invocable_wrapper {
    invocable_wrapper(): wrapped_(0) {}
    invocable_wrapper(const invocable_wrapper& w): wrapped_(&w.wrapped_->clone()) {}
    invocable_wrapper& operator=(const invocable_wrapper& that) {
        invocable_wrapper newthis(that);
        std::swap(wrapped_, newthis.wrapped_);
        return *this;
    }
    invocable_wrapper(invocable_wrapper&& w): wrapped_(w.wrapped_) {}
    invocable_wrapper& operator=(invocable_wrapper&& that) {delete wrapped_; wrapped_ = that.wrapped_; return *this; }
    ~invocable_wrapper() { delete wrapped_; }
 
    invocable_wrapper(const invocable& i): wrapped_(&i.clone()) {}
    void operator()() { (*wrapped_)(); }
 
    invocable* wrapped_;
};
 
class work {
  public:
    work() = default;
 
    work(const invocable& i): item_(i) {}
 
    void operator()() { item_(); }
 
    ~work() = default;
 
  private:
    invocable_wrapper item_;
};
 
// Utilities to make work from functions/member functions (C++03 version)
// Lots of repetition to handle functions/member functions with up to 3 arguments
 
template <class R>
struct work0 : public invocable_cloner<work0<R> > {
    R (* fn_)();
 
    work0(R (* f)()) :
        fn_(f) {}
 
    void operator()() {
        (*fn_)();
    }
};
 
template <class R, class A>
struct work1 : public invocable_cloner<work1<R,A> > {
    R (* fn_)(A);
    A a_;
 
    work1(R (* t)(A), A a) :
        fn_(t), a_(a) {}
 
    void operator()() {
        (*fn_)(a_);
    }
};
 
template <class R, class A, class B>
struct work2 : public invocable_cloner<work2<R,A,B> > {
    R (* fn_)(A, B);
    A a_;
    B b_;
 
    work2(R (* t)(A, B), A a, B b) :
        fn_(t), a_(a), b_(b) {}
 
    void operator()() {
        (*fn_)(a_, b_);
    }
};
 
template <class R, class A, class B, class C>
struct work3 : public invocable_cloner<work3<R,A,B,C> > {
    R (* fn_)(A, B, C);
    A a_;
    B b_;
    C c_;
 
    work3(R (* t)(A, B, C), A a, B b, C c) :
        fn_(t), a_(a), b_(b), c_(c) {}
 
    void operator()() {
        (*fn_)(a_, b_, c_);
    }
};
 
template <class R, class T>
struct work_pmf0 : public invocable_cloner<work_pmf0<R,T> > {
    T& holder_;
    R (T::* fn_)();
 
    work_pmf0(R (T::* a)(), T& h) :
        holder_(h), fn_(a) {}
 
    void operator()() {
        (holder_.*fn_)();
    }
};
 
template <class R, class T, class A>
struct work_pmf1 : public invocable_cloner<work_pmf1<R,T,A> > {
    T& holder_;
    R (T::* fn_)(A);
    A a_;
 
    work_pmf1(R (T::* t)(A), T& h, A a) :
        holder_(h), fn_(t), a_(a) {}
 
    void operator()() {
        (holder_.*fn_)(a_);
    }
};
 
template <class R, class T, class A, class B>
struct work_pmf2 : public invocable_cloner<work_pmf2<R,T,A,B> > {
    T& holder_;
    R (T::* fn_)(A, B);
    A a_;
    B b_;
 
    work_pmf2(R (T::* t)(A, B), T& h, A a, B b) :
        holder_(h), fn_(t), a_(a), b_(b) {}
 
    void operator()() {
        (holder_.*fn_)(a_, b_);
    }
};
 
template <class R, class T, class A, class B, class C>
struct work_pmf3 : public invocable_cloner<work_pmf3<R,T,A,B,C> > {
    T& holder_;
    R (T::* fn_)(A, B, C);
    A a_;
    B b_;
    C c_;
 
    work_pmf3(R (T::* t)(A, B, C), T& h, A a, B b, C c) :
        holder_(h), fn_(t), a_(a), b_(b), c_(c) {}
 
    void operator()() {
        (holder_.*fn_)(a_, b_, c_);
    }
};
 
template <class R, class T>
work make_work(R (T::*f)(), T* t) {
    return work_pmf0<R, T>(f, *t);
}
 
template <class R, class T, class A>
work make_work(R (T::*f)(A), T* t, A a) {
    return work_pmf1<R, T, A>(f, *t, a);
}
 
template <class R, class T, class A, class B>
work make_work(R (T::*f)(A, B), T* t, A a, B b) {
    return work_pmf2<R, T, A, B>(f, *t, a, b);
}
 
template <class R, class T, class A, class B, class C>
work make_work(R (T::*f)(A, B, C), T* t, A a, B b, C c) {
    return work_pmf3<R, T, A, B, C>(f, *t, a, b, c);
}
 
template <class R>
work make_work(R (*f)()) {
    return work0<R>(f);
}
 
template <class R, class A>
work make_work(R (*f)(A), A a) {
    return work1<R, A>(f, a);
}
 
template <class R, class A, class B>
work make_work(R (*f)(A, B), A a, B b) {
    return work2<R, A, B>(f, a, b);
}
 
template <class R, class A, class B, class C>
work make_work(R (*f)(A, B, C), A a, B b, C c) {
    return work3<R, A, B, C>(f, a, b, c);
}
 
} } // internal::v03
 
 
namespace internal { namespace v11 {
 
class work {
  public:
    work() = default;
 
    template <class T,
        // Make sure we don't match the copy or move constructors
        class = typename std::enable_if<!std::is_same<typename std::decay<T>::type,work>::value>::type
    >
    work(T&& f): item_(std::forward<T>(f)) {}
 
    void operator()() const { item_(); }
 
    ~work() = default;
 
  private:
    std::function<void()> item_;
};
 
template <class... Rest>
work make_work(Rest&&... r) {
    return std::bind(std::forward<Rest>(r)...);
}
 
} } // internal::v11
 
using internal::v11::work;
using internal::v11::make_work;
 
 
 
class PN_CPP_CLASS_EXTERN work_queue {
    class impl;
    work_queue& operator=(impl* i);
 
  public:
    PN_CPP_EXTERN work_queue();
 
    PN_CPP_EXTERN work_queue(container&);
 
    PN_CPP_EXTERN ~work_queue();
 
    PN_CPP_EXTERN bool add(work fn);
 
    PN_CPP_EXTERN PN_CPP_DEPRECATED("Use 'work_queue::add(work)'") bool add(void_function0& fn);
 
    PN_CPP_EXTERN void schedule(duration, work fn);
 
    PN_CPP_EXTERN PN_CPP_DEPRECATED("Use 'work_queue::schedule(duration, work)'") void schedule(duration, void_function0& fn);
 
  private:
    PN_CPP_EXTERN bool add(internal::v03::work fn);
    PN_CPP_EXTERN void schedule(duration, internal::v03::work fn);
 
    PN_CPP_EXTERN static work_queue& get(pn_connection_t*);
    PN_CPP_EXTERN static work_queue& get(pn_session_t*);
    PN_CPP_EXTERN static work_queue& get(pn_link_t*);
 
    std::unique_ptr<impl> impl_;
 
  friend class container;
  friend class io::connection_driver;
};
 
} // proton
 
#endif // PROTON_WORK_QUEUE_HPP