event/DeferredMonitor: eliminate obsolete class

Move its code to DeferEvent instead.

Makefile.am

@@ -523,8 +523,7 @@ libevent_a_SOURCES = \
 	src/event/SignalMonitor.hxx src/event/SignalMonitor.cxx \
 	src/event/TimerEvent.hxx src/event/TimerEvent.cxx \
 	src/event/IdleMonitor.hxx src/event/IdleMonitor.cxx \
-	src/event/DeferredMonitor.hxx src/event/DeferredMonitor.cxx \
-	src/event/DeferEvent.hxx \
+	src/event/DeferEvent.cxx src/event/DeferEvent.hxx \
 	src/event/MaskMonitor.hxx src/event/MaskMonitor.cxx \
 	src/event/SocketMonitor.cxx src/event/SocketMonitor.hxx \
 	src/event/BufferedSocket.cxx src/event/BufferedSocket.hxx \

src/event/DeferEvent.cxx

@@ -18,17 +18,17 @@
  */
 
 #include "config.h"
-#include "DeferredMonitor.hxx"
+#include "DeferEvent.hxx"
 #include "Loop.hxx"
 
 void
-DeferredMonitor::Cancel()
+DeferEvent::Cancel() noexcept
 {
 	loop.RemoveDeferred(*this);
 }
 
 void
-DeferredMonitor::Schedule()
+DeferEvent::Schedule() noexcept
 {
 	loop.AddDeferred(*this);
 }

src/event/DeferEvent.hxx

@@ -21,28 +21,49 @@
 #define MPD_DEFER_EVENT_HXX
 
 #include "check.h"
-#include "DeferredMonitor.hxx"
 #include "util/BindMethod.hxx"
 
+#include <boost/intrusive/list_hook.hpp>
+
+class EventLoop;
+
 /**
  * Invoke a method call in the #EventLoop.
  *
  * This class is thread-safe.
  */
-class DeferEvent final : DeferredMonitor {
+class DeferEvent final {
+	friend class EventLoop;
+
+	typedef boost::intrusive::list_member_hook<> ListHook;
+	ListHook list_hook;
+
+	EventLoop &loop;
+
 	typedef BoundMethod<void() noexcept> Callback;
 	const Callback callback;
 
 public:
-	DeferEvent(EventLoop &_loop, Callback _callback)
-		:DeferredMonitor(_loop), callback(_callback) {}
+	DeferEvent(EventLoop &_loop, Callback _callback) noexcept
+		:loop(_loop), callback(_callback) {}
 
-	using DeferredMonitor::GetEventLoop;
-	using DeferredMonitor::Schedule;
-	using DeferredMonitor::Cancel;
+	~DeferEvent() noexcept {
+		Cancel();
+	}
+
+	EventLoop &GetEventLoop() noexcept {
+		return loop;
+	}
+
+	void Schedule() noexcept;
+	void Cancel() noexcept;
 
 private:
-	void RunDeferred() noexcept override {
+	bool IsPending() const noexcept {
+		return list_hook.is_linked();
+	}
+
+	void RunDeferred() noexcept {
 		callback();
 	}
 };

src/event/DeferredMonitor.hxx

@@ -1,66 +0,0 @@
-/*
- * Copyright 2003-2017 The Music Player Daemon Project
- * http://www.musicpd.org
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#ifndef MPD_SOCKET_DEFERRED_MONITOR_HXX
-#define MPD_SOCKET_DEFERRED_MONITOR_HXX
-
-#include "check.h"
-
-#include <boost/intrusive/list_hook.hpp>
-
-class EventLoop;
-
-/**
- * Defer execution of an event into an #EventLoop.
- *
- * This class is thread-safe.
- */
-class DeferredMonitor {
-	friend class EventLoop;
-
-	typedef boost::intrusive::list_member_hook<> ListHook;
-	ListHook list_hook;
-
-	EventLoop &loop;
-
-public:
-	DeferredMonitor(EventLoop &_loop)
-		:loop(_loop) {}
-
-	~DeferredMonitor() {
-		Cancel();
-	}
-
-	EventLoop &GetEventLoop() {
-		return loop;
-	}
-
-	void Schedule();
-	void Cancel();
-
-private:
-	bool IsPending() const {
-		return list_hook.is_linked();
-	}
-
-protected:
-	virtual void RunDeferred() = 0;
-};
-
-#endif

src/event/Loop.cxx

@@ -21,7 +21,7 @@
 #include "Loop.hxx"
 #include "SocketMonitor.hxx"
 #include "IdleMonitor.hxx"
-#include "DeferredMonitor.hxx"
+#include "DeferEvent.hxx"
 #include "util/ScopeExit.hxx"
 
 EventLoop::EventLoop(ThreadId _thread)
@@ -163,7 +163,7 @@ EventLoop::Run()
 				return;
 		}
 
-		/* try to handle DeferredMonitors without WakeFD
+		/* try to handle DeferEvents without WakeFD
 		   overhead */
 		{
 			const std::lock_guard<Mutex> lock(mutex);
@@ -211,7 +211,7 @@ EventLoop::Run()
 }
 
 void
-EventLoop::AddDeferred(DeferredMonitor &d)
+EventLoop::AddDeferred(DeferEvent &d) noexcept
 {
 	bool must_wake;
 
@@ -221,7 +221,7 @@ EventLoop::AddDeferred(DeferredMonitor &d)
 			return;
 
 		/* we don't need to wake up the EventLoop if another
-		   DeferredMonitor has already done it */
+		   DeferEvent has already done it */
 		must_wake = !busy && deferred.empty();
 
 		deferred.push_back(d);
@@ -233,7 +233,7 @@ EventLoop::AddDeferred(DeferredMonitor &d)
 }
 
 void
-EventLoop::RemoveDeferred(DeferredMonitor &d)
+EventLoop::RemoveDeferred(DeferEvent &d) noexcept
 {
 	const std::lock_guard<Mutex> protect(mutex);
 
@@ -245,7 +245,7 @@ void
 EventLoop::HandleDeferred()
 {
 	while (!deferred.empty() && !quit) {
-		DeferredMonitor &m = deferred.front();
+		auto &m = deferred.front();
 		assert(m.IsPending());
 
 		deferred.pop_front();

src/event/Loop.hxx

@@ -30,7 +30,7 @@
 #include "SocketMonitor.hxx"
 #include "TimerEvent.hxx"
 #include "IdleMonitor.hxx"
-#include "DeferredMonitor.hxx"
+#include "DeferEvent.hxx"
 
 #include <boost/intrusive/set.hpp>
 #include <boost/intrusive/list.hpp>
@@ -76,10 +76,10 @@ class EventLoop final : SocketMonitor
 
 	Mutex mutex;
 
-	typedef boost::intrusive::list<DeferredMonitor,
-				       boost::intrusive::member_hook<DeferredMonitor,
-								     DeferredMonitor::ListHook,
-								     &DeferredMonitor::list_hook>,
+	typedef boost::intrusive::list<DeferEvent,
+				       boost::intrusive::member_hook<DeferEvent,
+								     DeferEvent::ListHook,
+								     &DeferEvent::list_hook>,
 				       boost::intrusive::constant_time_size<false>> DeferredList;
 	DeferredList deferred;
 
@@ -160,19 +160,19 @@ public:
 	void CancelTimer(TimerEvent &t);
 
 	/**
-	 * Schedule a call to DeferredMonitor::RunDeferred().
+	 * Schedule a call to DeferEvent::RunDeferred().
 	 *
 	 * This method is thread-safe.
 	 */
-	void AddDeferred(DeferredMonitor &d);
+	void AddDeferred(DeferEvent &d) noexcept;
 
 	/**
-	 * Cancel a pending call to DeferredMonitor::RunDeferred().
+	 * Cancel a pending call to DeferEvent::RunDeferred().
 	 * However after returning, the call may still be running.
 	 *
 	 * This method is thread-safe.
 	 */
-	void RemoveDeferred(DeferredMonitor &d);
+	void RemoveDeferred(DeferEvent &d) noexcept;
 
 	/**
 	 * The main function of this class.  It will loop until
@@ -182,7 +182,7 @@ public:
 
 private:
 	/**
-	 * Invoke all pending DeferredMonitors.
+	 * Invoke all pending DeferEvents.
 	 *
 	 * Caller must lock the mutex.
 	 */