00001 /******************************************************************************* 00002 Copyright (c) 2011, Yahoo! Inc. 00003 All rights reserved. 00004 00005 Redistribution and use of this software in source and binary forms, 00006 with or without modification, are permitted provided that the following 00007 conditions are met: 00008 00009 * Redistributions of source code must retain the above 00010 copyright notice, this list of conditions and the 00011 following disclaimer. 00012 00013 * Redistributions in binary form must reproduce the above 00014 copyright notice, this list of conditions and the 00015 following disclaimer in the documentation and/or other 00016 materials provided with the distribution. 00017 00018 * Neither the name of Yahoo! Inc. nor the names of its 00019 contributors may be used to endorse or promote products 00020 derived from this software without specific prior 00021 written permission of Yahoo! Inc. 00022 00023 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 00024 IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 00025 TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 00026 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 00027 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00028 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 00029 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00030 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 00031 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00032 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 00033 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00034 00035 The Initial Developer of the Original Code is Shravan Narayanamurthy. 00036 ******************************************************************************/ 00037 /* 00038 * Context.h 00039 * 00040 * 00041 * Created on: 23-Dec-2010 00042 * 00043 */ 00044 00045 #ifndef CONTEXT_H_ 00046 #define CONTEXT_H_ 00047 00048 #include "boost/unordered_map.hpp" 00049 #include <string> 00050 00051 using namespace std; 00052 using namespace boost; 00053 00054 //!An object that maintains the context for the executing code 00055 /** 00056 * This is a Singleton object that maintains a context 00057 * for the executing code. It contains a list of properties 00058 * stored as a key-value map 00059 * 00060 * All the flags defined are made available through this 00061 * object. It can also be used as a mechanism for message 00062 * passing. This reduces coupling between the code and 00063 * gflags. 00064 */ 00065 class Context { 00066 public: 00067 static Context& get_instance(); 00068 00069 //!Get an integer valued property named key 00070 int get_int(string key); 00071 //!Get a string valued property named key 00072 string get_string(string key); 00073 //!Get a double valued property named key 00074 double get_double(string key); 00075 //!Get a bool valued property named key 00076 bool get_bool(string key); 00077 00078 //!Put a string value for property key 00079 //!into the map 00080 void put_string(string key, string val); 00081 00082 private: 00083 Context(); 00084 virtual ~Context(); 00085 00086 static Context* _instance; 00087 unordered_map<string, string> _flags; 00088 }; 00089 00090 #endif /* CONTEXT_H_ */