NFD

Create a global instance of io_service and Scheduler.

namespace nfd {
boost::asio::io_service& getGlobalIoService();

namespace scheduler {
struct EventId;
typedef function<void()> Event;
EventId schedule(time::Duration after, Event event);
void cancel(const EventId& eventId);
} // namespace scheduler
using scheduler::EventId; // import to nfd namespace

} // namespace nfd

The global instances can be replaced/cleared/reset during unit testing.

This task is divided to two stages:

Stage 1¶

• Create global io_service and Scheduler.
• nfd::Scheduler class still exists. Its global instance is accessed at nfd::scheduler::getGlobalScheduler().
• Use the global io_service in main().
• Forwarder uses the global Scheduler.
• Unit tests can have their own io_service and Scheduler, if they don't interact with Forwarder.

Stage 2¶

• Delete references to io_service and Scheduler in all classes and constructors.
• Change all scheduler calls to use nfd::scheduler::schedule and nfd::scheduler::cancel.
• Delete or move away nfd::Scheduler class. Delete nfd::getGlobalScheduler() function.
• Unit tests also use the global instances, and are provided a way to reset / replace the global io_service and Scheduler.