void do_resolve (std::vector <std::string> const& names,
HandlerType const& handler, CompletionCounter)
{
check_precondition (! names.empty());
if (m_called_stop.load () == 0)
{
// TODO NIKB use emplace_back once we move to C++11
m_work.push_back(Work(names, handler));
m_journal.debug <<
"Queued new job with " << names.size() <<
" tasks. " << m_work.size() << " jobs outstanding.";
if (m_work.size() == 1)
{
check_precondition (m_idle);
m_journal.trace << "Waking up";
m_idle = false;
m_io_service.post (m_strand.wrap (boost::bind (
&NameResolverImpl::do_work, this,
CompletionCounter(this))));
}
}
}
void do_finish (
std::string name,
boost::system::error_code const& ec,
HandlerType handler,
boost::asio::ip::tcp::resolver::iterator iter,
CompletionCounter)
{
if (ec == boost::asio::error::operation_aborted)
return;
std::vector <beast::IP::Endpoint> addresses;
// If we get an error message back, we don't return any
// results that we may have gotten.
if (!ec)
{
while (iter != boost::asio::ip::tcp::resolver::iterator())
{
addresses.push_back (beast::IPAddressConversion::from_asio (*iter));
++iter;
}
}
handler (name, addresses);
m_io_service.post (m_strand.wrap (std::bind (
&ResolverAsioImpl::do_work, this,
CompletionCounter (this))));
}
void do_work (CompletionCounter)
{
if (m_called_stop.load () == 1)
return;
// We don't have any work to do at this time
if (m_work.empty())
{
m_idle = true;
m_journal.trace << "Sleeping";
return;
}
if (m_work.front().names.empty())
m_work.pop_front();
std::string const name (m_work.front().names.back());
HandlerType handler (m_work.front().handler);
m_work.front().names.pop_back();
HostAndPort const hp (parseName(name));
if (hp.first.empty())
{
m_journal.error <<
"Unable to parse '" << name << "'";
m_io_service.post (m_strand.wrap (boost::bind (
&NameResolverImpl::do_work, this,
CompletionCounter(this))));
return;
}
boost::asio::ip::tcp::resolver::query query (
hp.first, hp.second);
m_resolver.async_resolve (query, boost::bind (
&NameResolverImpl::do_finish, this, name,
boost::asio::placeholders::error, handler,
boost::asio::placeholders::iterator,
CompletionCounter(this)));
}
void stop_async () override
{
if (m_stop_called.exchange (true) == false)
{
m_io_service.dispatch (m_strand.wrap (std::bind (
&ResolverAsioImpl::do_stop,
this, CompletionCounter (this))));
JLOG(m_journal.debug()) << "Queued a stop request";
}
}
void stop_async ()
{
if (m_called_stop.exchange (1) == 0)
{
m_io_service.dispatch (m_strand.wrap (boost::bind (
&NameResolverImpl::do_stop,
this, CompletionCounter (this))));
m_journal.debug << "Stopping";
}
}
void do_work (CompletionCounter)
{
if (m_stop_called == true)
return;
// We don't have any work to do at this time
if (m_work.empty ())
return;
std::string const name (m_work.front ().names.back());
HandlerType handler (m_work.front ().handler);
m_work.front ().names.pop_back ();
if (m_work.front ().names.empty ())
m_work.pop_front();
HostAndPort const hp (parseName (name));
if (hp.first.empty ())
{
JLOG(m_journal.error()) <<
"Unable to parse '" << name << "'";
m_io_service.post (m_strand.wrap (std::bind (
&ResolverAsioImpl::do_work, this,
CompletionCounter (this))));
return;
}
boost::asio::ip::tcp::resolver::query query (
hp.first, hp.second);
m_resolver.async_resolve (query, std::bind (
&ResolverAsioImpl::do_finish, this, name,
std::placeholders::_1, handler,
std::placeholders::_2,
CompletionCounter (this)));
}
void resolve (
std::vector <std::string> const& names,
HandlerType const& handler)
{
check_precondition (m_called_stop.load () == 0);
check_precondition (!names.empty());
// TODO NIKB use rvalue references to construct and move
// reducing cost.
m_io_service.dispatch (m_strand.wrap (boost::bind (
&NameResolverImpl::do_resolve, this,
names, handler, CompletionCounter(this))));
}
void resolve (
std::vector <std::string> const& names,
HandlerType const& handler) override
{
assert (m_stop_called == false);
assert (m_stopped == true);
assert (!names.empty());
// TODO NIKB use rvalue references to construct and move
// reducing cost.
m_io_service.dispatch (m_strand.wrap (std::bind (
&ResolverAsioImpl::do_resolve, this,
names, handler, CompletionCounter (this))));
}
void do_resolve (std::vector <std::string> const& names,
HandlerType const& handler, CompletionCounter)
{
assert (! names.empty());
if (m_stop_called == false)
{
m_work.emplace_back (names, handler);
JLOG(m_journal.debug()) <<
"Queued new job with " << names.size() <<
" tasks. " << m_work.size() << " jobs outstanding.";
if (m_work.size() > 0)
{
m_io_service.post (m_strand.wrap (std::bind (
&ResolverAsioImpl::do_work, this,
CompletionCounter (this))));
}
}
}