LoadManager.h

//------------------------------------------------------------------------------
/*
    This file is part of rippled: https://github.com/ripple/rippled
    Copyright (c) 2012, 2013 Ripple Labs Inc.
 
    Permission to use, copy, modify, and/or distribute this software for any
    purpose  with  or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.
 
    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================
 
#ifndef RIPPLE_APP_MAIN_LOADMANAGER_H_INCLUDED
#define RIPPLE_APP_MAIN_LOADMANAGER_H_INCLUDED
 
#include <ripple/core/Stoppable.h>
#include <memory>
#include <mutex>
#include <thread>
 
namespace ripple {
 
class Application;
 
class LoadManager : public Stoppable
{
    LoadManager (Application& app, Stoppable& parent, beast::Journal journal);
 
public:
    LoadManager () = delete;
    LoadManager (LoadManager const&) = delete;
    LoadManager& operator=(LoadManager const&) = delete;
 
    ~LoadManager ();
 
    // VFALCO NOTE it seems that the deadlock detector has an "armed" state
    //             to prevent it from going off during program startup if
    //             there's a lengthy initialization operation taking place?
    //
    void activateDeadlockDetector ();
 
    void resetDeadlockDetector ();
 
    //--------------------------------------------------------------------------
 
    // Stoppable members
    void onPrepare () override;
 
    void onStart () override;
 
    void onStop () override;
 
private:
    void run ();
 
private:
    Application& app_;
    beast::Journal const journal_;
 
    std::thread thread_;
    std::mutex mutex_;          // Guards deadLock_, armed_, and stop_.
 
    std::chrono::steady_clock::time_point deadLock_;  // Detect server deadlocks.
    bool armed_;
    bool stop_;
 
    friend
    std::unique_ptr<LoadManager>
    make_LoadManager(Application& app, Stoppable& parent, beast::Journal journal);
};
 
std::unique_ptr<LoadManager>
make_LoadManager (
    Application& app, Stoppable& parent, beast::Journal journal);
 
} // ripple
 
#endif