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#include "signal.hpp"
using namespace std;
using namespace flat::core;
map<string, channel*> channel::channels;
channel::channel(const string& id, prior_t prior)
{
channel * other = find_channel(id);
if (!other)
//TODO throw exception
;
/* Initialize task, post-process, fifth priority */
checker = new task( this,
&channel::post_processing,
prior);
string ID = (id.empty()) ? object::random_id() : id;
set_id(ID);
channels.insert(pair<string, channel*>(ID, this));
}
channel::~channel()
{
channels.erase(get_id());
/* Finalize task */
delete checker;
}
void channel::emit(const signal& sig)
{
stack.insert(sig);
}
void channel::connect(const listener* l)
{
/* Control not to double */
for (auto lis : listeners)
{
if (lis == l)
return;
}
listeners.push_back(l);
}
void channel::disconnect(const listener* l)
{
listeners.remove(l);
}
channel * channel::find_channel(const string& id)
{
if (id.empty())
return 0;
auto it = channels.find(id);
return (it == channels.end()) ? 0 : (*it).second;
}
void channel::post_processing()
{
if (!stack.empty()) {
// TODO, maybe it exists pop
/* for each listener_s, catch signal */
for (const auto& signal : stack)
{
for (auto l : listeners)
l->invoke(signal);
}
stack.clear();
}
}
/* signal class */
signal::signal( object *sender,
const string& id,
void *data,
prior_t priority)
: sender(sender), data(data), priority(priority)
{
set_id(id);
}
bool signal::emit(const string& channel) const
{
channel * chan = channel::find_channel(channel);
if (!chan)
return false;
/* Finally emit in channel */
chan->emit(*this);
return true;
}
/* listener_s class */
listener::listener( callback_t m_callback,
const initializer_list<string>& filters)
: m_callback(m_callback), filters(filters), parent(0)
{
}
listener::~listener()
{
if (parent != 0)
parent->disconnect(this);
}
bool listener::check_in_filters(const string& filter) const
{
for (const auto& f : filters)
{
if (filter == f)
return true;
}
return false;
}
void listener::add_filter(const string& f)
{
filters.push_back(f);
}
void listener::remove_filter(const string& f)
{
filters.remove(f);
}
bool listener::connect(const string& chan)
{
channel * c = channel::find_channel(chan);
if (!c)
c->connect(this);
parent = c;
return c != 0;
}
bool listener_s::disconnect(const string& chan)
{
channel * c = channel::find_channel(chan);
if (!c)
c->connect(this);
parent = 0;
return c != 0;
}
void listener::invoke(const signal&)
{
if ( (!sig.get_id().empty() && check_in_filters(sig.get_id())) ||
(sig.get_id().empty() && filters.empty()))
m_callback(sig.sender);
}
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