virtual std::shared_ptr<Job> fetchJob() = 0;
virtual void finishJob( std::shared_ptr<Job> job ) = 0;
virtual void failJob( std::shared_ptr<Job> job ) = 0;
virtual std::shared_ptr<Job> fetchJob() = 0;
virtual void finishJob( std::shared_ptr<Job> job ) = 0;
virtual void failJob( std::shared_ptr<Job> job ) = 0;