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#include "core/signal.hpp"
#include "object.hpp"
#include <functional>
#include "flatland.hpp"
#include "debug.hpp"
using namespace flat::core;
std::map<std::string, std::weak_ptr<channel>> channel::m_channels;
channel::channel(const std::string& id) : labelled(id), m_mapped(false)
{
}
channel::~channel()
{
// by default it should be there
if (m_mapped)
m_channels.erase(label);
}
void channel::start(priority_t prior)
{
npdebug("Starting channel: ", label);
// Initialize task
m_checker = flat::main_job().delegate_task(&channel::check_and_call, this, prior);
}
bool channel::map()
{
if (!m_mapped) {
channel::ptr other = channel::find(label);
if (!other) {
m_channels.insert(std::pair<std::string, std::weak_ptr<channel>>(label, weak_from_this()));
m_mapped = true;
}
}
return m_mapped;
}
void channel::emit(const signal& sig)
{
m_stack.insert(sig);
npdebug("Emitted signal: ", sig.label, " ", this);
}
bool channel::connect(listener::ptr l)
{
/* Control not to double */
for (auto lis : m_listeners)
{
auto pt = lis.lock();
if (pt.get() == l.get())
return false;
}
m_listeners.push_back(l);
return true;
}
void channel::disconnect(listener::ptr l)
{
m_listeners.erase(
std::remove_if(
m_listeners.begin(),
m_listeners.end(),
[&l](std::weak_ptr<listener> p){
listener::ptr pt = p.lock();
return pt.get() == l.get();
}
)
);
}
bool channel::connect(listener* l)
{
listener::ptr pt(l);
return connect(pt);
}
void channel::disconnect(listener* l)
{
listener::ptr pt(l);
disconnect(pt);
}
listener::ptr channel::connect(listener::callback f, const std::initializer_list<std::string>& filters)
{
listener::ptr lis = std::make_shared<listener>(f, filters);
if (connect(lis))
return lis;
return nullptr;
}
channel::ptr channel::create(const std::string& id, priority_t prior)
{
ptr out = std::make_shared<channel>(id);
if (!out->map())
return nullptr;
out->start(prior);
return out;
}
channel::ptr channel::find(const std::string& id)
{
// what about anonymous (unlabeled) channels?
if (id.empty())
return nullptr;
auto it = m_channels.find(id);
return (it == m_channels.end()) ? nullptr : (*it).second.lock();
}
void channel::check_and_call()
{
if (!m_stack.empty()) {
npdebug("Signal detected: ", label, " ", this)
std::vector<std::weak_ptr<listener>> to_erase;
// TODO, maybe it exists pop
/* for each listener_s, catch signal */
for (auto l : m_listeners)
{
listener::ptr pt;
if (pt = l.lock())
{
for (const auto& sig : m_stack)
pt->invoke(sig);
}
else
to_erase.push_back(l);
}
/* Erase invalidated listeners */
m_listeners.erase(
std::remove_if(
m_listeners.begin(),
m_listeners.end(),
[](std::weak_ptr<listener> e) { return e.expired(); }
)
);
m_stack.clear(); // TODO not so efficient
}
}
/* signal class */
signal::signal(object *sender,
const std::string& id,
void *data,
priority_t p)
: labelled(id, true),
prioritized(p),
m_sender(sender),
m_package(package(data))
{
}
/* listener_s class */
listener::listener(callback callback, const std::initializer_list<std::string>& filters)
: m_callback(callback), m_filters(filters)
{
}
listener::~listener()
{
}
bool listener::check_in_filters(const std::string& filter) const
{
for (const auto& f : m_filters)
{
if (filter == f)
return true;
}
return false;
}
void listener::add_filter(const std::string& f)
{
m_filters.push_back(f);
}
void listener::remove_filter(const std::string& f)
{
m_filters.remove(f);
}
bool listener::connect(const std::string& chan)
{
channel::ptr c = channel::find(chan);
if (!c)
c->connect(this);
return bool(c);
}
bool listener::disconnect(const std::string& chan)
{
channel::ptr c = channel::find(chan);
if (!c)
c->disconnect(this);
return bool(c);
}
void listener::invoke(const signal& sig)
{
if ((!sig.label.empty() && check_in_filters(sig.label)) ||
(sig.label.empty() && m_filters.empty()))
m_callback(sig.m_sender, sig.m_package);
}
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