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 30.08.2009
11 *
12 * \brief An example of asynchronous logging in multiple threads.
13 */
14
15 // #define BOOST_LOG_DYN_LINK 1
16
17 #include <stdexcept>
18 #include <string>
19 #include <iostream>
20 #include <fstream>
21 #include <functional>
22 #include <boost/ref.hpp>
23 #include <boost/bind.hpp>
24 #include <boost/smart_ptr/shared_ptr.hpp>
25 #include <boost/date_time/posix_time/posix_time.hpp>
26 #include <boost/thread/thread.hpp>
27 #include <boost/thread/barrier.hpp>
28
29 #include <boost/log/common.hpp>
30 #include <boost/log/expressions.hpp>
31 #include <boost/log/attributes.hpp>
32 #include <boost/log/sinks.hpp>
33 #include <boost/log/sources/logger.hpp>
34 #include <boost/log/utility/record_ordering.hpp>
35
36 namespace logging = boost::log;
37 namespace attrs = boost::log::attributes;
38 namespace src = boost::log::sources;
39 namespace sinks = boost::log::sinks;
40 namespace expr = boost::log::expressions;
41 namespace keywords = boost::log::keywords;
42
43 using boost::shared_ptr;
44
45 enum
46 {
47 LOG_RECORDS_TO_WRITE = 10000,
48 THREAD_COUNT = 2
49 };
50
BOOST_LOG_INLINE_GLOBAL_LOGGER_DEFAULT(test_lg,src::logger_mt)51 BOOST_LOG_INLINE_GLOBAL_LOGGER_DEFAULT(test_lg, src::logger_mt)
52
53 //! This function is executed in multiple threads
54 void thread_fun(boost::barrier& bar)
55 {
56 // Wait until all threads are created
57 bar.wait();
58
59 // Here we go. First, identify the thread.
60 BOOST_LOG_SCOPED_THREAD_TAG("ThreadID", boost::this_thread::get_id());
61
62 // Now, do some logging
63 for (unsigned int i = 0; i < LOG_RECORDS_TO_WRITE; ++i)
64 {
65 BOOST_LOG(test_lg::get()) << "Log record " << i;
66 }
67 }
68
main(int argc,char * argv[])69 int main(int argc, char* argv[])
70 {
71 try
72 {
73 // Open a rotating text file
74 shared_ptr< std::ostream > strm(new std::ofstream("test.log"));
75 if (!strm->good())
76 throw std::runtime_error("Failed to open a text log file");
77
78 // Create a text file sink
79 typedef sinks::text_ostream_backend backend_t;
80 typedef sinks::asynchronous_sink<
81 backend_t,
82 sinks::unbounded_ordering_queue<
83 logging::attribute_value_ordering< unsigned int, std::less< unsigned int > >
84 >
85 > sink_t;
86 shared_ptr< sink_t > sink(new sink_t(
87 boost::make_shared< backend_t >(),
88 // We'll apply record ordering to ensure that records from different threads go sequentially in the file
89 keywords::order = logging::make_attr_ordering("RecordID", std::less< unsigned int >())));
90
91 sink->locked_backend()->add_stream(strm);
92
93 sink->set_formatter
94 (
95 expr::format("%1%: [%2%] [%3%] - %4%")
96 % expr::attr< unsigned int >("RecordID")
97 % expr::attr< boost::posix_time::ptime >("TimeStamp")
98 % expr::attr< boost::thread::id >("ThreadID")
99 % expr::smessage
100 );
101
102 // Add it to the core
103 logging::core::get()->add_sink(sink);
104
105 // Add some attributes too
106 logging::core::get()->add_global_attribute("TimeStamp", attrs::local_clock());
107 logging::core::get()->add_global_attribute("RecordID", attrs::counter< unsigned int >());
108
109 // Create logging threads
110 boost::barrier bar(THREAD_COUNT);
111 boost::thread_group threads;
112 for (unsigned int i = 0; i < THREAD_COUNT; ++i)
113 threads.create_thread(boost::bind(&thread_fun, boost::ref(bar)));
114
115 // Wait until all action ends
116 threads.join_all();
117
118 // Flush all buffered records
119 sink->stop();
120 sink->flush();
121
122 return 0;
123 }
124 catch (std::exception& e)
125 {
126 std::cout << "FAILURE: " << e.what() << std::endl;
127 return 1;
128 }
129 }
130