the begginning

utils/idbhdfs/hdfs-shared/HdfsFsCache.cpp

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+/* 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. */
+
+/*
+ * InfiniDB FOSS License Exception
+ * We want free and open source software applications under certain
+ * licenses to be able to use the GPL-licensed InfiniDB idbhdfs
+ * libraries despite the fact that not all such FOSS licenses are
+ * compatible with version 2 of the GNU General Public License.  
+ * Therefore there are special exceptions to the terms and conditions 
+ * of the GPLv2 as applied to idbhdfs libraries, which are 
+ * identified and described in more detail in the FOSS License 
+ * Exception in the file utils/idbhdfs/FOSS-EXCEPTION.txt
+ */
+
+#include "HdfsFsCache.h"
+
+#include <boost/thread.hpp>
+#include <iostream>
+
+using namespace std;
+
+namespace
+{
+	boost::mutex guard;
+}
+
+namespace idbdatafile
+{
+
+hdfsFS HdfsFsCache::s_fs = 0;
+
+hdfsFS HdfsFsCache::fs()
+{
+	boost::mutex::scoped_lock lock( guard );
+	if( !s_fs )
+	{
+		s_fs = hdfsConnect("default", 0);
+	}
+	return s_fs;
+}
+
+}