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114 lines
3.5 KiB
C++
114 lines
3.5 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of rippled: https://github.com/ripple/rippled
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Copyright (c) 2012, 2013 Ripple Labs Inc.
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef RIPPLE_APP_MAIN_LOADMANAGER_H_INCLUDED
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#define RIPPLE_APP_MAIN_LOADMANAGER_H_INCLUDED
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#include <ripple/core/Stoppable.h>
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#include <memory>
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#include <mutex>
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#include <thread>
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namespace ripple {
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class Application;
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/** Manages load sources.
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This object creates an associated thread to maintain a clock.
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When the server is overloaded by a particular peer it issues a warning
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first. This allows friendly peers to reduce their consumption of resources,
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or disconnect from the server.
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The warning system is used instead of merely dropping, because hostile
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peers can just reconnect anyway.
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*/
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class LoadManager : public Stoppable
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{
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LoadManager (Application& app, Stoppable& parent, beast::Journal journal);
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public:
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LoadManager () = delete;
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LoadManager (LoadManager const&) = delete;
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LoadManager& operator=(LoadManager const&) = delete;
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/** Destroy the manager.
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The destructor returns only after the thread has stopped.
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*/
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~LoadManager ();
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/** Turn on deadlock detection.
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The deadlock detector begins in a disabled state. After this function
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is called, it will report deadlocks using a separate thread whenever
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the reset function is not called at least once per 10 seconds.
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@see resetDeadlockDetector
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*/
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// VFALCO NOTE it seems that the deadlock detector has an "armed" state
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// to prevent it from going off during program startup if
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// there's a lengthy initialization operation taking place?
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//
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void activateDeadlockDetector ();
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/** Reset the deadlock detection timer.
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A dedicated thread monitors the deadlock timer, and if too much
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time passes it will produce log warnings.
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*/
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void resetDeadlockDetector ();
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//--------------------------------------------------------------------------
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// Stoppable members
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void onPrepare () override;
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void onStart () override;
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void onStop () override;
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private:
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void run ();
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private:
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Application& app_;
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beast::Journal journal_;
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std::thread thread_;
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std::mutex mutex_; // Guards deadLock_, armed_, and stop_.
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std::chrono::steady_clock::time_point deadLock_; // Detect server deadlocks.
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bool armed_;
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bool stop_;
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friend
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std::unique_ptr<LoadManager>
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make_LoadManager(Application& app, Stoppable& parent, beast::Journal journal);
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};
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std::unique_ptr<LoadManager>
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make_LoadManager (
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Application& app, Stoppable& parent, beast::Journal journal);
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} // ripple
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#endif
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