juce_ChildProcessManager.h

/*
  ==============================================================================
 
   This file is part of the JUCE library.
   Copyright (c) 2022 - Raw Material Software Limited
 
   JUCE is an open source library subject to commercial or open-source
   licensing.
 
   By using JUCE, you agree to the terms of both the JUCE 7 End-User License
   Agreement and JUCE Privacy Policy.
 
   End User License Agreement: www.juce.com/juce-7-licence
   Privacy Policy: www.juce.com/juce-privacy-policy
 
   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).
 
   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.
 
  ==============================================================================
*/
 
namespace juce
{
    class JUCE_API  ChildProcessManager final : private DeletedAtShutdown
    {
    public:
       #ifndef DOXYGEN
        JUCE_DECLARE_SINGLETON_SINGLETHREADED_MINIMAL (ChildProcessManager)
       #endif

        template <typename... Args>
        std::shared_ptr<ChildProcess> createAndStartManagedChildProcess (Args&&... args)
        {
            auto p = std::make_shared<ChildProcess>();
 
            if (! p->start (std::forward<Args> (args)...))
                return nullptr;
 
            processes.insert (p);
            timer.startTimer (1000);
 
            return p;
        }

        auto addChildProcessExitedListener (std::function<void (ChildProcess*)> listener)
        {
            return listeners.addListener (std::move (listener));
        }

        auto hasRunningProcess() const
        {
            return timer.isTimerRunning();
        }
 
    private:
        ChildProcessManager() = default;
        ~ChildProcessManager() override  { clearSingletonInstance(); }
 
        void checkProcesses();
 
        std::set<std::shared_ptr<ChildProcess>> processes;
        detail::CallbackListenerList<ChildProcess*> listeners;
        TimedCallback timer { [this] { checkProcesses(); } };
    };
 
} // namespace juce