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#pragma once
#include "std/function.hpp"
#include "std/shared_ptr.hpp"
#include "std/vector.hpp"
#include "base/cancellable.hpp"
#include "base/thread.hpp"
#include "base/threaded_list.hpp"
namespace core
{
/// class, that executes task, specified as a functors on the specified number of threads
/// - all tasks are stored in the single ThreadedList
class CommandsQueue
{
private:
class Routine;
public:
struct Command;
/// execution environment for single command
/// - passed into the task functor
/// - task functor should check the IsCancelled()
/// on the reasonable small interval and cancel
/// it's work upon receiving "true".
class Environment : public my::Cancellable
{
private:
size_t m_threadNum;
protected:
explicit Environment(size_t threadNum);
friend class Routine;
public:
size_t threadNum() const; //< number of the thread, which is executing the commands
};
/// single commmand
typedef function<void(Environment const &)> function_t;
/// basic command
/// - could wait for the completion of its execution
struct BaseCommand
{
shared_ptr<threads::Condition> m_cond;
mutable int m_waitCount;
mutable bool m_isCompleted;
/// should we create the threads::Condition ?
/// this flag is used to save resources
BaseCommand(bool isWaitable);
/// call this function when the execution
/// of the command is finished to release the waiters.
void finish() const;
/// @warning only single thread could "join" command
void join();
};
/// chain of commands
struct Chain
{
private:
list<function_t> m_fns;
public:
Chain();
Chain(function_t const & fn)
{
m_fns.push_back(fn);
}
Chain & addCommand(function_t const & fn)
{
m_fns.push_back(fn);
return *this;
}
void operator()(Environment const & env);
};
/// single command.
/// - commands could be chained together, using Chain class
struct Command : BaseCommand
{
private:
function_t m_fn;
public:
Command(bool isWaitable = false);
template <typename tt>
Command(tt t, bool isWaitable = false)
: BaseCommand(isWaitable), m_fn(t)
{}
void perform(Environment const & env) const;
};
private:
/// single execution routine
class Routine : public threads::IRoutine
{
private:
CommandsQueue * m_parent;
Environment m_env;
public:
Routine(CommandsQueue * parent, size_t idx);
/// threads::IRoutine overrides:
void Do() override;
void Cancel() override;
void CancelCommand();
};
/// class, which excapsulates thread and routine into single class.
struct Executor
{
threads::Thread m_thread;
void Cancel();
void CancelCommand();
};
vector<Executor> m_executors;
ThreadedList<shared_ptr<Command> > m_commands;
list<shared_ptr<Command> > m_initCommands;
list<shared_ptr<Command> > m_finCommands;
list<shared_ptr<Command> > m_cancelCommands;
friend class Routine;
threads::Condition m_cond;
size_t m_activeCommands;
void FinishCommand();
CommandsQueue(CommandsQueue const &);
CommandsQueue const & operator=(CommandsQueue const &);
void ClearImpl(list<shared_ptr<Command> > & l);
public:
CommandsQueue(size_t executorsCount);
~CommandsQueue();
/// Number of executors in this queue
size_t ExecutorsCount() const;
/// Adding different types of commands
/// @{
void AddCommand(shared_ptr<Command> const & cmd);
void AddInitCommand(shared_ptr<Command> const & cmd);
void AddFinCommand(shared_ptr<Command> const & cmd);
void AddCancelCommand(shared_ptr<Command> const & cmd);
/// @}
void Start();
void Cancel();
void CancelCommands();
void Join();
void Clear();
template<typename command_tt>
shared_ptr<Command> AddCommand(command_tt cmd, bool isWaitable = false)
{
shared_ptr<Command> pcmd(new Command(cmd, isWaitable));
AddCommand(pcmd);
return pcmd;
}
template <typename command_tt>
shared_ptr<Command> AddInitCommand(command_tt cmd, bool isWaitable = false)
{
shared_ptr<Command> const pcmd(new Command(cmd, isWaitable));
AddInitCommand(pcmd);
return pcmd;
}
template <typename command_tt>
shared_ptr<Command> const AddFinCommand(command_tt cmd, bool isWaitable = false)
{
shared_ptr<Command> pcmd(new Command(cmd, isWaitable));
AddFinCommand(pcmd);
return pcmd;
}
template <typename command_tt>
shared_ptr<Command> const AddCancelCommand(command_tt cmd, bool isWaitable = false)
{
shared_ptr<Command> pcmd(new Command(cmd, isWaitable));
AddCancelCommand(pcmd);
return pcmd;
}
};
}
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