From cc511e7b60270b2a263c5c4618c940a7a1982d56 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Sat, 10 Aug 2013 10:33:43 +0200
Subject: event/IdleMonitor: new monitor class
---
Makefile.am | 1 +
src/event/IdleMonitor.cxx | 64 +++++++++++++++++++++++++++++++++++++++++++++
src/event/IdleMonitor.hxx | 66 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 131 insertions(+)
create mode 100644 src/event/IdleMonitor.cxx
create mode 100644 src/event/IdleMonitor.hxx
diff --git a/Makefile.am b/Makefile.am
index 957124b0a..a0aa115d5 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -299,6 +299,7 @@ libevent_a_SOURCES = \
src/event/WakeFD.hxx \
src/event/SignalMonitor.hxx src/event/SignalMonitor.cxx \
src/event/TimeoutMonitor.hxx src/event/TimeoutMonitor.cxx \
+ src/event/IdleMonitor.hxx src/event/IdleMonitor.cxx \
src/event/DeferredMonitor.hxx src/event/DeferredMonitor.cxx \
src/event/SocketMonitor.cxx src/event/SocketMonitor.hxx \
src/event/BufferedSocket.cxx src/event/BufferedSocket.hxx \
diff --git a/src/event/IdleMonitor.cxx b/src/event/IdleMonitor.cxx
new file mode 100644
index 000000000..1ee86f7f5
--- /dev/null
+++ b/src/event/IdleMonitor.cxx
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2003-2013 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.
+ */
+
+#include "config.h"
+#include "IdleMonitor.hxx"
+#include "Loop.hxx"
+
+void
+IdleMonitor::Cancel()
+{
+ assert(loop.IsInside());
+
+ if (!IsActive())
+ return;
+
+ g_source_remove(source_id);
+ source_id = 0;
+}
+
+void
+IdleMonitor::Schedule()
+{
+ assert(loop.IsInside());
+
+ if (IsActive())
+ /* already scheduled */
+ return;
+
+ source_id = loop.AddIdle(Callback, this);
+}
+
+void
+IdleMonitor::Run()
+{
+ assert(loop.IsInside());
+ assert(source_id != 0);
+ source_id = 0;
+
+ OnIdle();
+}
+
+gboolean
+IdleMonitor::Callback(gpointer data)
+{
+ IdleMonitor &monitor = *(IdleMonitor *)data;
+ monitor.Run();
+ return false;
+}
diff --git a/src/event/IdleMonitor.hxx b/src/event/IdleMonitor.hxx
new file mode 100644
index 000000000..ee9f5e392
--- /dev/null
+++ b/src/event/IdleMonitor.hxx
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2003-2013 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_IDLE_MONITOR_HXX
+#define MPD_SOCKET_IDLE_MONITOR_HXX
+
+#include "check.h"
+
+#include <glib.h>
+
+class EventLoop;
+
+/**
+ * An event that runs when the EventLoop has become idle, before
+ * waiting for more events. This class is not thread-safe; all
+ * methods must be run from EventLoop's thread.
+ */
+class IdleMonitor {
+ EventLoop &loop;
+
+ guint source_id;
+
+public:
+ IdleMonitor(EventLoop &_loop)
+ :loop(_loop), source_id(0) {}
+
+ ~IdleMonitor() {
+ Cancel();
+ }
+
+ EventLoop &GetEventLoop() const {
+ return loop;
+ }
+
+ bool IsActive() const {
+ return source_id != 0;
+ }
+
+ void Schedule();
+ void Cancel();
+
+protected:
+ virtual void OnIdle() = 0;
+
+private:
+ void Run();
+ static gboolean Callback(gpointer data);
+};
+
+#endif /* MAIN_NOTIFY_H */
--
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