initial checkin

Check in contents of upstream 1.4.2 tarball, exclude generated files.

3 files changed, 143 insertions, 0 deletions

diff --git a/src/patterns/Makefile.am b/src/patterns/Makefile.am
new file mode 100644
index 0000000..4dc022e
--- /dev/null
+++ b/src/patterns/Makefile.am
@@ -0,0 +1,7 @@
+AM_CPPFLAGS = -Wall -I$(top_srcdir)/src
+
+noinst_LIBRARIES = libpatterns.a
+
+libpatterns_a_SOURCES =\
+	observer.cpp\
+	observer.h
diff --git a/src/patterns/observer.cpp b/src/patterns/observer.cpp
new file mode 100644
index 0000000..c09e80c
--- /dev/null
+++ b/src/patterns/observer.cpp
@@ -0,0 +1,53 @@
+/*
+    Copyright (C) 2005-2009  Michel de Boer <michel@twinklephone.com>
+
+    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#include "observer.h"
+
+using namespace patterns;
+
+t_subject::~t_subject() {
+	mtx_observers.lock();
+	for (list<t_observer *>::const_iterator it = observers.begin();
+	     it != observers.end(); ++it)
+	{
+		(*it)->subject_destroyed();
+	}
+	mtx_observers.unlock();
+}
+
+void t_subject::attach(t_observer *o) {
+	mtx_observers.lock();
+	observers.push_back(o);
+	mtx_observers.unlock();
+}
+
+void t_subject::detach(t_observer *o) {
+	mtx_observers.lock();
+	observers.remove(o);
+	mtx_observers.unlock();
+}
+
+void t_subject::notify(void) const {
+	mtx_observers.lock();
+	for (list<t_observer *>::const_iterator it = observers.begin();
+	     it != observers.end(); ++it)
+	{
+		(*it)->update();
+	}
+	mtx_observers.unlock();
+}
diff --git a/src/patterns/observer.h b/src/patterns/observer.h
new file mode 100644
index 0000000..9aefaef
--- /dev/null
+++ b/src/patterns/observer.h
@@ -0,0 +1,83 @@
+/*
+    Copyright (C) 2005-2009  Michel de Boer <michel@twinklephone.com>
+
+    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+/**
+ * @file
+ * Abstract observer pattern.
+ */
+
+#ifndef _OBSERVER_H
+#define _OBSERVER_H
+
+#include <list>
+
+#include "threads/mutex.h"
+
+using namespace std;
+
+namespace patterns {
+
+/** Observer. */
+class t_observer {
+public:
+	virtual ~t_observer() {};
+	
+	/**
+	 * This method is called by an observed subject to indicate its state
+	 * has changed.
+	 */
+	virtual void update(void) = 0;
+	
+	/** 
+	 * This method is called when the subject is destroyed.
+	 */
+	virtual void subject_destroyed(void) = 0;
+};
+
+/** An observed subject. */
+class t_subject {
+private:
+	/** Mutex to protect access to the observers. */
+	mutable t_recursive_mutex mtx_observers;
+
+	list<t_observer *> observers;	/** Observers of this subject. */
+	
+public:
+	virtual ~t_subject();
+	
+	/**
+	 * Attach an observer.
+	 * @param o [in] The observer.
+	 */
+	void attach(t_observer *o);
+	
+	/**
+	 * Detach an observer.
+	 * @param o [in] The observer.
+	 */
+	void detach(t_observer *o);
+	
+	/**
+	 * Notify all observers.
+	 */
+	void notify(void) const;
+};
+
+}; // namespace
+
+#endif