1 /*
2 * Copyright Andrey Semashev 2007 - 2015.
3 * Distributed under the Boost Software License, Version 1.0.
4 * (See accompanying file LICENSE_1_0.txt or copy at
5 * http://www.boost.org/LICENSE_1_0.txt)
6 */
7 /*!
8 * \file main.cpp
9 * \author Andrey Semashev
10 * \date 10.06.2008
11 *
12 * \brief An example of logging in multiple threads.
13 * See the library tutorial for expanded comments on this code.
14 * It may also be worthwhile reading the Wiki requirements page:
15 * http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?Boost.Logging
16 */
17
18 // #define BOOST_LOG_DYN_LINK 1
19
20 #include <stdexcept>
21 #include <string>
22 #include <iostream>
23 #include <fstream>
24 #include <boost/ref.hpp>
25 #include <boost/bind.hpp>
26 #include <boost/smart_ptr/shared_ptr.hpp>
27 #include <boost/date_time/posix_time/posix_time.hpp>
28 #include <boost/thread/thread.hpp>
29 #include <boost/thread/barrier.hpp>
30
31 #include <boost/log/common.hpp>
32 #include <boost/log/expressions.hpp>
33 #include <boost/log/attributes.hpp>
34 #include <boost/log/sinks.hpp>
35 #include <boost/log/sources/logger.hpp>
36
37 namespace logging = boost::log;
38 namespace attrs = boost::log::attributes;
39 namespace src = boost::log::sources;
40 namespace sinks = boost::log::sinks;
41 namespace expr = boost::log::expressions;
42 namespace keywords = boost::log::keywords;
43
44 using boost::shared_ptr;
45
46 enum
47 {
48 LOG_RECORDS_TO_WRITE = 10000,
49 THREAD_COUNT = 2
50 };
51
BOOST_LOG_INLINE_GLOBAL_LOGGER_DEFAULT(test_lg,src::logger_mt)52 BOOST_LOG_INLINE_GLOBAL_LOGGER_DEFAULT(test_lg, src::logger_mt)
53
54 //! This function is executed in multiple threads
55 void thread_fun(boost::barrier& bar)
56 {
57 // Wait until all threads are created
58 bar.wait();
59
60 // Now, do some logging
61 for (unsigned int i = 0; i < LOG_RECORDS_TO_WRITE; ++i)
62 {
63 BOOST_LOG(test_lg::get()) << "Log record " << i;
64 }
65 }
66
main(int argc,char * argv[])67 int main(int argc, char* argv[])
68 {
69 try
70 {
71 // Open a rotating text file
72 shared_ptr< std::ostream > strm(new std::ofstream("test.log"));
73 if (!strm->good())
74 throw std::runtime_error("Failed to open a text log file");
75
76 // Create a text file sink
77 shared_ptr< sinks::synchronous_sink< sinks::text_ostream_backend > > sink(
78 new sinks::synchronous_sink< sinks::text_ostream_backend >);
79
80 sink->locked_backend()->add_stream(strm);
81
82 sink->set_formatter
83 (
84 expr::format("%1%: [%2%] [%3%] - %4%")
85 % expr::attr< unsigned int >("RecordID")
86 % expr::attr< boost::posix_time::ptime >("TimeStamp")
87 % expr::attr< attrs::current_thread_id::value_type >("ThreadID")
88 % expr::smessage
89 );
90
91 // Add it to the core
92 logging::core::get()->add_sink(sink);
93
94 // Add some attributes too
95 logging::core::get()->add_global_attribute("TimeStamp", attrs::local_clock());
96 logging::core::get()->add_global_attribute("RecordID", attrs::counter< unsigned int >());
97 logging::core::get()->add_global_attribute("ThreadID", attrs::current_thread_id());
98
99 // Create logging threads
100 boost::barrier bar(THREAD_COUNT);
101 boost::thread_group threads;
102 for (unsigned int i = 0; i < THREAD_COUNT; ++i)
103 threads.create_thread(boost::bind(&thread_fun, boost::ref(bar)));
104
105 // Wait until all action ends
106 threads.join_all();
107
108 return 0;
109 }
110 catch (std::exception& e)
111 {
112 std::cout << "FAILURE: " << e.what() << std::endl;
113 return 1;
114 }
115 }
116