the begginning

writeengine/server/we_observer.cpp

@@ -0,0 +1,94 @@
+/* Copyright (C) 2014 InfiniDB, Inc.
+
+   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; version 2 of
+   the License.
+
+   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. */
+
+/*******************************************************************************
+* $Id$
+*
+*******************************************************************************/
+
+/*
+ * Observer.cpp
+ *
+ *  Created on: Oct 5, 2011
+ *      Author: bpaul@calpont.com
+ */
+
+#include <boost/thread/mutex.hpp>
+
+#include "we_observer.h"
+
+
+namespace WriteEngine {
+
+//-----------------------------------------------------------------------------
+
+//	ctor
+Observer::Observer() {
+
+}
+
+//-----------------------------------------------------------------------------
+//dtor
+Observer::~Observer() {
+	//
+}
+
+//-----------------------------------------------------------------------------
+//ctor
+Subject::Subject(){
+
+}
+//-----------------------------------------------------------------------------
+//dtor
+Subject::~Subject(){
+
+}
+
+//-----------------------------------------------------------------------------
+
+void Subject::attach(Observer* Obs) {
+	boost::mutex::scoped_lock aLstLock;
+	fObs.push_back(Obs);
+}
+
+//-----------------------------------------------------------------------------
+
+void Subject::detach(Observer* Obs) {
+	boost::mutex::scoped_lock aLstLock;
+	Observers::iterator aIt = fObs.begin();
+	while (aIt != fObs.end()) {
+		if ((*aIt) == Obs) {
+			fObs.erase(aIt);
+			break;
+		}
+	}
+}
+
+//-----------------------------------------------------------------------------
+
+void Subject::notify() {
+	boost::mutex::scoped_lock aLstLock;
+	Observers::iterator aIt = fObs.begin();
+	while (aIt != fObs.end()) {
+		(*aIt)->update(this);
+	}
+}
+
+//-----------------------------------------------------------------------------
+
+}// namespace WriteEngine
+