~ws_echo_server()
{
work_.reset();
t_.join();
}
// By having a default value for the second argument, this function call
// operator matches the completion signature of both the async_write and
// steady_timer::async_wait operations.
void operator()(const boost::system::error_code& error, std::size_t = 0)
{
if (!error)
{
switch (state_)
{
case starting:
case writing:
if (repeat_count_ > 0)
{
--repeat_count_;
state_ = waiting;
delay_timer_->expires_after(std::chrono::seconds(1));
delay_timer_->async_wait(std::move(*this));
return; // Composed operation not yet complete.
}
break; // Composed operation complete, continue below.
case waiting:
state_ = writing;
boost::asio::async_write(socket_,
boost::asio::buffer(*encoded_message_), std::move(*this));
return; // Composed operation not yet complete.
}
}
// This point is reached only on completion of the entire composed
// operation.
// We no longer have any future work coming for the I/O executor.
io_work_.reset();
// Deallocate the encoded message before calling the user-supplied
// completion handler.
encoded_message_.reset();
// Call the user-supplied handler with the result of the operation.
handler_(error);
}