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#pragma once
#include <map>
#include <list>
#include <set>
#include <initializer_list>
#include "task.hpp"
#include "types.hpp"
#include "object.hpp"
#include <functional>
#include <memory>
#include "priority.hpp"
#include "labelled.hpp"
namespace flat::core
{
class signal : virtual public labelled, virtual public prioritized
{
public:
struct package
{
package(void *data) : data(data) {}
template<class T>
T * get() {
return reinterpret_cast<T*>(data);
}
void * data;
};
object *m_sender;
package m_package;
signal(object * sender,
const std::string& id = "",
void * data = 0,
priority_t prior = priority_t::none);
};
/* Listener class */
class listener
{
public:
using callback = std::function<void(const object*, signal::package)>;
using ptr = std::shared_ptr<listener>;
listener(callback m_callback, const std::initializer_list<std::string>& filters = {});
~listener();
void add_filter(const std::string&);
void remove_filter(const std::string&);
bool connect(const std::string&);
bool disconnect(const std::string&);
void invoke(const signal&);
/* Allow to safely bind a functor */
template<typename R, typename T>
static ptr create( R T::*mf,
T& obj,
const std::initializer_list<std::string>& filters = {}) {
return std::make_shared<listener>(std::bind(mf, obj), filters);
}
private:
callback m_callback;
std::list<std::string> m_filters;
bool check_in_filters(const std::string&) const;
};
/* Channel class */
class channel : virtual public labelled, public std::enable_shared_from_this<channel>
{
private:
/* Post processing signal stacking */
queue<signal> m_stack;
/* Listeners list */
std::list<std::weak_ptr<listener>> m_listeners;
/* Synchronous task checking for signals */
task::ptr m_checker;
/* Channel mapping */
static std::map<std::string, std::weak_ptr<channel>> m_channels;
bool m_mapped;
bool map();
public:
using ptr = std::shared_ptr<channel>;
/*
* Constructs a new channel and try to bind it the specified job
* If no job is specified, then flat::main_job will be taken
*
* Note: Remember to check for channel legacy with legit() member function
* A channel is legit if and only if there's no other channel
* corresponding to the same label name
* In general, a channel must be UNIQUE with its label
*/
channel(const std::string& id = "");
~channel();
// do not allow to copy a channel
// it does not have any sense to create a channel with the same name
channel(const channel&) = delete;
channel& operator=(const channel&) = delete;
void emit(const signal&);
bool connect(listener::ptr l);
void disconnect(listener::ptr l);
bool connect(listener* l);
void disconnect(listener* l);
/*
* Check for legacy
*
* Note: Channels are mapped by their label.
* A channel is legit if and only if there's no other channel
* corresponding to the same label name.
*/
bool legit() const;
/*
* It tries binding the channel task and make the channel legit
* In case of success, true is returned, otherwise false
*/
bool start(priority_t task_priority = priority_t::none, job * _job = NULL);
listener::ptr connect(listener::callback f,
const std::initializer_list<std::string>& filters = {});
template<typename R, typename T>
inline listener::ptr connect(R T::*mf, T* obj,
const std::initializer_list<std::string>& filters = {})
{
using namespace std::placeholders;
return connect(std::bind(mf, obj, _1, _2), filters);
}
/*
* Find channel by its name
*/
static ptr find(const std::string&);
/*
* Safer than constructor
* It constructs a new channel checking whether it is legit or not.
* It returns a nullptr if the legacy is not verified.
*
* Note: Channels are mapped by their label.
* A channel is legit if and only if there's no other channel
* corresponding to the same label name.
*/
static ptr create(const std::string& id, priority_t prior = priority_t::none, job * _job = NULL);
void check_and_call();
};
}
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