source: pacpusframework/trunk/3rd/apache-log4cxx/include/log4cxx/mdc.h@ 143

Last change on this file since 143 was 2, checked in by sgosseli, 13 years ago

Add 3rd party libraries (log4cxx).
File size: 10.1 KB
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1/*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. 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 _LOG4CXX_MDC_H
19#define _LOG4CXX_MDC_H
20
21#if defined(_MSC_VER)
22#pragma warning (push)
23#pragma warning ( disable: 4231 4251 4275 4786 )
24#endif
25
26#include <log4cxx/log4cxx.h>
27#include <log4cxx/logstring.h>
28#include <map>
29
30namespace log4cxx
31{
32 /**
33 The MDC class is similar to the {@link log4cxx::NDC NDC} class except that it is
34 based on a map instead of a stack. It provides <em>mapped
35 diagnostic contexts</em>. A <em>Mapped Diagnostic Context</em>, or
36 MDC in short, is an instrument for distinguishing interleaved log
37 output from different sources. Log output is typically interleaved
38 when a server handles multiple clients near-simultaneously.
39
40 <p><b><em>The MDC is managed on a per thread basis</em></b>. A
41 child thread automatically inherits a <em>copy</em> of the mapped
42 diagnostic context of its parent.
43
44 */
45 class LOG4CXX_EXPORT MDC
46 {
47 public:
48 /** String to string stl map.
49 */
50 typedef std::map<LogString, LogString> Map;
51
52 /**
53 * Places a key/value pair in the MDC for the current thread
54 * which will be removed during the corresponding destructor. Both
55 * construction and destruction are expected to be on the same thread.
56 * @param key key
57 * @param value value.
58 */
59 MDC(const std::string& key, const std::string& value);
60 ~MDC();
61
62 /**
63 * Put a context value (the <code>o</code> parameter) as identified
64 * with the <code>key</code> parameter into the current thread's
65 * context map.
66 *
67 * <p>If the current thread does not have a context map it is
68 * created as a side effect.
69 * @param key key
70 * @param value value.
71 */
72 static void put(const std::string& key, const std::string& value);
73 /**
74 * Put a context value (the <code>o</code> parameter) as identified
75 * with the <code>key</code> parameter into the current thread's
76 * context map.
77 *
78 * <p>If the current thread does not have a context map it is
79 * created as a side effect.
80 * */
81 static void putLS(const LogString& key, const LogString& value);
82
83 /**
84 * Get the context identified by the <code>key</code> parameter.
85 *
86 * <p>This method has no side effects.
87 * @param key key.
88 * @return value for key, empty if not set.
89 * */
90 static std::string get(const std::string& key);
91 /**
92 * Gets the context identified by the <code>key</code> parameter.
93 * @param key context key.
94 * @param dest destination to which value is appended.
95 * @return true if key has associated value.
96 */
97 static bool get(const LogString& key, LogString& dest);
98
99 /**
100 * Remove the the context identified by the <code>key</code>
101 * parameter.
102 * @param key key.
103 * @return value if key had been set, empty if not.
104 */
105 static std::string remove(const std::string& key);
106#if LOG4CXX_WCHAR_T_API
107 /**
108 * Places a key/value pair in the MDC for the current thread
109 * which will be removed during the corresponding destructor. Both
110 * construction and destruction are expected to be on the same thread.
111 * @param key key
112 * @param value value.
113 */
114 MDC(const std::wstring& key, const std::wstring& value);
115 /**
116 * Put a context value (the <code>o</code> parameter) as identified
117 * with the <code>key</code> parameter into the current thread's
118 * context map.
119 *
120 * <p>If the current thread does not have a context map it is
121 * created as a side effect.
122 * @param key key
123 * @param value value.
124 */
125 static void put(const std::wstring& key, const std::wstring& value);
126 /**
127 * Get the context identified by the <code>key</code> parameter.
128 *
129 * <p>This method has no side effects.
130 * @param key key.
131 * @return value for key, empty if not set.
132 * */
133 static std::wstring get(const std::wstring& key);
134 /**
135 * Remove the the context identified by the <code>key</code>
136 * parameter.
137 * @param key key.
138 * @return value if key had been set, empty if not.
139 */
140 static std::wstring remove(const std::wstring& key);
141#endif
142#if LOG4CXX_UNICHAR_API
143 /**
144 * Places a key/value pair in the MDC for the current thread
145 * which will be removed during the corresponding destructor. Both
146 * construction and destruction are expected to be on the same thread.
147 * @param key key
148 * @param value value.
149 */
150 MDC(const std::basic_string<UniChar>& key, const std::basic_string<UniChar>& value);
151 /**
152 * Put a context value (the <code>o</code> parameter) as identified
153 * with the <code>key</code> parameter into the current thread's
154 * context map.
155 *
156 * <p>If the current thread does not have a context map it is
157 * created as a side effect.
158 * @param key key
159 * @param value value.
160 */
161 static void put(const std::basic_string<UniChar>& key, const std::basic_string<UniChar>& value);
162 /**
163 * Get the context identified by the <code>key</code> parameter.
164 *
165 * <p>This method has no side effects.
166 * @param key key.
167 * @return value for key, empty if not set.
168 * */
169 static std::basic_string<UniChar> get(const std::basic_string<UniChar>& key);
170 /**
171 * Remove the the context identified by the <code>key</code>
172 * parameter.
173 * @param key key.
174 * @return value if key had been set, empty if not.
175 */
176 static std::basic_string<UniChar> remove(const std::basic_string<UniChar>& key);
177#endif
178#if LOG4CXX_CFSTRING_API
179 /**
180 * Places a key/value pair in the MDC for the current thread
181 * which will be removed during the corresponding destructor. Both
182 * construction and destruction are expected to be on the same thread.
183 * @param key key
184 * @param value value.
185 */
186 MDC(const CFStringRef& key, const CFStringRef& value);
187 /**
188 * Put a context value (the <code>o</code> parameter) as identified
189 * with the <code>key</code> parameter into the current thread's
190 * context map.
191 *
192 * <p>If the current thread does not have a context map it is
193 * created as a side effect.
194 * @param key key
195 * @param value value.
196 */
197 static void put(const CFStringRef& key, const CFStringRef& value);
198 /**
199 * Get the context identified by the <code>key</code> parameter.
200 *
201 * <p>This method has no side effects.
202 * @param key key.
203 * @return value for key, empty if not set.
204 * */
205 static CFStringRef get(const CFStringRef& key);
206 /**
207 * Remove the the context identified by the <code>key</code>
208 * parameter.
209 * @param key key.
210 * @return value if key had been set, empty if not.
211 */
212 static CFStringRef remove(const CFStringRef& key);
213#endif
214 /**
215 * Remove the the context identified by the <code>key</code>
216 * parameter.
217 * @param key key.
218 * @param prevValue buffer to which previous value is appended.
219 * @return true if key existed in MDC.
220 */
221 static bool remove(const LogString& key, LogString& prevValue);
222
223 /**
224 * Clear all entries in the MDC.
225 */
226 static void clear();
227
228 private:
229 MDC(const MDC&);
230 MDC& operator=(const MDC&);
231 LogString key;
232 }; // class MDC;
233} // namespace log4cxx
234
235#if defined(_MSC_VER)
236#pragma warning (pop)
237#endif
238
239
240#endif // _LOG4CXX_MDC_H
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