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30 // Author: Zhanyong Wan
32 // Defines the ScopedMockLog class (using Google C++ Mocking
33 // Framework), which is convenient for testing code that uses LOG().
35 // NOTE(keir): This is a fork until Google Log exports the scoped mock log
36 // class; see: http://code.google.com/p/google-glog/issues/detail?id=88
38 #ifndef GOOGLE_CERES_INTERNAL_MOCK_LOG_H_
39 #define GOOGLE_CERES_INTERNAL_MOCK_LOG_H_
43 #include <gmock/gmock.h>
45 #include "glog/logging.h"
49 // A ScopedMockLog object intercepts LOG() messages issued during its
50 // lifespan. Using this together with Google C++ Mocking Framework,
51 // it's very easy to test how a piece of code calls LOG(). The
54 // TEST(FooTest, LogsCorrectly) {
57 // // We expect the WARNING "Something bad!" exactly twice.
58 // EXPECT_CALL(log, Log(WARNING, _, "Something bad!"))
61 // // We allow foo.cc to call LOG(INFO) any number of times.
62 // EXPECT_CALL(log, Log(INFO, HasSubstr("/foo.cc"), _))
63 // .Times(AnyNumber());
65 // Foo(); // Exercises the code under test.
67 class ScopedMockLog : public google::LogSink {
69 // When a ScopedMockLog object is constructed, it starts to
71 ScopedMockLog() { AddLogSink(this); }
73 // When the object is destructed, it stops intercepting logs.
74 virtual ~ScopedMockLog() { RemoveLogSink(this); }
76 // Implements the mock method:
78 // void Log(LogSeverity severity, const string& file_path,
79 // const string& message);
81 // The second argument to Send() is the full path of the source file
82 // in which the LOG() was issued.
84 // Note, that in a multi-threaded environment, all LOG() messages from a
85 // single thread will be handled in sequence, but that cannot be guaranteed
86 // for messages from different threads. In fact, if the same or multiple
87 // expectations are matched on two threads concurrently, their actions will
88 // be executed concurrently as well and may interleave.
89 MOCK_METHOD3(Log, void(google::LogSeverity severity,
90 const std::string& file_path,
91 const std::string& message));
94 // Implements the send() virtual function in class LogSink.
95 // Whenever a LOG() statement is executed, this function will be
96 // invoked with information presented in the LOG().
98 // The method argument list is long and carries much information a
99 // test usually doesn't care about, so we trim the list before
100 // forwarding the call to Log(), which is much easier to use in
103 // We still cannot call Log() directly, as it may invoke other LOG()
104 // messages, either due to Invoke, or due to an error logged in
105 // Google C++ Mocking Framework code, which would trigger a deadlock
106 // since a lock is held during send().
108 // Hence, we save the message for WaitTillSent() which will be called after
109 // the lock on send() is released, and we'll call Log() inside
110 // WaitTillSent(). Since while a single send() call may be running at a
111 // time, multiple WaitTillSent() calls (along with the one send() call) may
112 // be running simultaneously, we ensure thread-safety of the exchange between
113 // send() and WaitTillSent(), and that for each message, LOG(), send(),
114 // WaitTillSent() and Log() are executed in the same thread.
115 virtual void send(google::LogSeverity severity,
116 const char* full_filename,
117 const char* base_filename, int line, const tm* tm_time,
118 const char* message, size_t message_len) {
119 // We are only interested in the log severity, full file name, and
121 message_info_.severity = severity;
122 message_info_.file_path = full_filename;
123 message_info_.message = std::string(message, message_len);
126 // Implements the WaitTillSent() virtual function in class LogSink.
127 // It will be executed after send() and after the global logging lock is
128 // released, so calls within it (or rather within the Log() method called
129 // within) may also issue LOG() statements.
131 // LOG(), send(), WaitTillSent() and Log() will occur in the same thread for
132 // a given log message.
133 virtual void WaitTillSent() {
134 // First, and very importantly, we save a copy of the message being
135 // processed before calling Log(), since Log() may indirectly call send()
136 // and WaitTillSent() in the same thread again.
137 MessageInfo message_info = message_info_;
138 Log(message_info.severity, message_info.file_path, message_info.message);
141 // All relevant information about a logged message that needs to be passed
142 // from send() to WaitTillSent().
144 google::LogSeverity severity;
145 std::string file_path;
148 MessageInfo message_info_;
151 } // namespace testing
153 #endif // GOOGLE_CERES_INTERNAL_MOCK_LOG_H_