1 /*
2 **
3 ** Copyright 2015, The Android Open Source Project
4 **
5 ** Licensed under the Apache License, Version 2.0 (the "License");
6 ** you may not use this file except in compliance with the License.
7 ** You may obtain a copy of the License at
8 **
9 **     http://www.apache.org/licenses/LICENSE-2.0
10 **
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 */
17 
18 #ifndef SYSTEM_EXTRAS_PERFPROFD_CONFIGREADER_H_
19 #define SYSTEM_EXTRAS_PERFPROFD_CONFIGREADER_H_
20 
21 #include <string>
22 #include <map>
23 
24 //
25 // This table describes the perfprofd config file syntax in terms of
26 // key/value pairs.  Values come in two flavors: strings, or unsigned
27 // integers. In the latter case the reader sets allowable
28 // minimum/maximum for the setting.
29 //
30 class ConfigReader {
31 
32  public:
33   ConfigReader();
34   ~ConfigReader();
35 
36   // Ask for the current setting of a config item
37   unsigned getUnsignedValue(const char *key) const;
38   std::string getStringValue(const char *key) const;
39 
40   // read the specified config file, applying any settings it contains
41   // returns true for successful read, false if conf file cannot be opened.
42   bool readFile();
43 
44   // set/get path to config file
45   static void setConfigFilePath(const char *path);
46   static const char *getConfigFilePath();
47 
48   // override a config item (for unit testing purposes)
49   void overrideUnsignedEntry(const char *key, unsigned new_value);
50 
51  private:
52   void addUnsignedEntry(const char *key,
53                         unsigned default_value,
54                         unsigned min_value,
55                         unsigned max_value);
56   void addStringEntry(const char *key, const char *default_value);
57   void addDefaultEntries();
58   void parseLine(const char *key, const char *value, unsigned linecount);
59 
60   typedef struct { unsigned minv, maxv; } values;
61   std::map<std::string, values> u_info;
62   std::map<std::string, unsigned> u_entries;
63   std::map<std::string, std::string> s_entries;
64   bool trace_config_read;
65 };
66 
67 #endif
68