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Side by Side Diff: base/win/event_trace_controller.h

Issue 7461141: Rename BASE_API to BASE_EXPORT. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src/
Patch Set: '' Created 9 years, 4 months ago
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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 // 4 //
5 // Declaration of a Windows event trace controller class. 5 // Declaration of a Windows event trace controller class.
6 // The controller takes care of creating and manipulating event trace 6 // The controller takes care of creating and manipulating event trace
7 // sessions. 7 // sessions.
8 // 8 //
9 // Event tracing for Windows is a system-provided service that provides 9 // Event tracing for Windows is a system-provided service that provides
10 // logging control and high-performance transport for generic, binary trace 10 // logging control and high-performance transport for generic, binary trace
11 // events. Event trace providers register with the system by their name, 11 // events. Event trace providers register with the system by their name,
12 // which is a GUID, and can from that point forward receive callbacks that 12 // which is a GUID, and can from that point forward receive callbacks that
13 // start or end tracing and that change their trace level and enable mask. 13 // start or end tracing and that change their trace level and enable mask.
14 // 14 //
15 // A trace controller can create an event tracing session, which either 15 // A trace controller can create an event tracing session, which either
16 // sends events to a binary file, or to a realtime consumer, or both. 16 // sends events to a binary file, or to a realtime consumer, or both.
17 // 17 //
18 // A trace consumer consumes events from zero or one realtime session, 18 // A trace consumer consumes events from zero or one realtime session,
19 // as well as potentially from multiple binary trace files. 19 // as well as potentially from multiple binary trace files.
20 #ifndef BASE_WIN_EVENT_TRACE_CONTROLLER_H_ 20 #ifndef BASE_WIN_EVENT_TRACE_CONTROLLER_H_
21 #define BASE_WIN_EVENT_TRACE_CONTROLLER_H_ 21 #define BASE_WIN_EVENT_TRACE_CONTROLLER_H_
22 #pragma once 22 #pragma once
23 23
24 #include <windows.h> 24 #include <windows.h>
25 #include <wmistr.h> 25 #include <wmistr.h>
26 #include <evntrace.h> 26 #include <evntrace.h>
27 #include <string> 27 #include <string>
28 28
29 #include "base/base_api.h" 29 #include "base/base_export.h"
30 #include "base/basictypes.h" 30 #include "base/basictypes.h"
31 31
32 namespace base { 32 namespace base {
33 namespace win { 33 namespace win {
34 34
35 // Utility class to make it easier to work with EVENT_TRACE_PROPERTIES. 35 // Utility class to make it easier to work with EVENT_TRACE_PROPERTIES.
36 // The EVENT_TRACE_PROPERTIES structure contains information about an 36 // The EVENT_TRACE_PROPERTIES structure contains information about an
37 // event tracing session. 37 // event tracing session.
38 class BASE_API EtwTraceProperties { 38 class BASE_EXPORT EtwTraceProperties {
39 public: 39 public:
40 EtwTraceProperties(); 40 EtwTraceProperties();
41 41
42 EVENT_TRACE_PROPERTIES* get() { 42 EVENT_TRACE_PROPERTIES* get() {
43 return &properties_; 43 return &properties_;
44 } 44 }
45 45
46 const EVENT_TRACE_PROPERTIES* get() const { 46 const EVENT_TRACE_PROPERTIES* get() const {
47 return reinterpret_cast<const EVENT_TRACE_PROPERTIES*>(&properties_); 47 return reinterpret_cast<const EVENT_TRACE_PROPERTIES*>(&properties_);
48 } 48 }
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78 // The actual size of the buffer is forced by this member. 78 // The actual size of the buffer is forced by this member.
79 char buffer_[kBufSize]; 79 char buffer_[kBufSize];
80 }; 80 };
81 81
82 DISALLOW_COPY_AND_ASSIGN(EtwTraceProperties); 82 DISALLOW_COPY_AND_ASSIGN(EtwTraceProperties);
83 }; 83 };
84 84
85 // This class implements an ETW controller, which knows how to start and 85 // This class implements an ETW controller, which knows how to start and
86 // stop event tracing sessions, as well as controlling ETW provider 86 // stop event tracing sessions, as well as controlling ETW provider
87 // log levels and enable bit masks under the session. 87 // log levels and enable bit masks under the session.
88 class BASE_API EtwTraceController { 88 class BASE_EXPORT EtwTraceController {
89 public: 89 public:
90 EtwTraceController(); 90 EtwTraceController();
91 ~EtwTraceController(); 91 ~EtwTraceController();
92 92
93 // Start a session with given name and properties. 93 // Start a session with given name and properties.
94 HRESULT Start(const wchar_t* session_name, EtwTraceProperties* prop); 94 HRESULT Start(const wchar_t* session_name, EtwTraceProperties* prop);
95 95
96 // Starts a session tracing to a file with some default properties. 96 // Starts a session tracing to a file with some default properties.
97 HRESULT StartFileSession(const wchar_t* session_name, 97 HRESULT StartFileSession(const wchar_t* session_name,
98 const wchar_t* logfile_path, 98 const wchar_t* logfile_path,
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143 std::wstring session_name_; 143 std::wstring session_name_;
144 TRACEHANDLE session_; 144 TRACEHANDLE session_;
145 145
146 DISALLOW_COPY_AND_ASSIGN(EtwTraceController); 146 DISALLOW_COPY_AND_ASSIGN(EtwTraceController);
147 }; 147 };
148 148
149 } // namespace win 149 } // namespace win
150 } // namespace base 150 } // namespace base
151 151
152 #endif // BASE_WIN_EVENT_TRACE_CONTROLLER_H_ 152 #endif // BASE_WIN_EVENT_TRACE_CONTROLLER_H_
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