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<p>A simple logging class.
<a href="classWt_1_1WLogger.html#details">More...</a></p>
<p><code>#include <Wt/WLogger></code></p>
<p><a href="classWt_1_1WLogger-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="nested-classes"></a>
Classes</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLogger_1_1Field.html">Field</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Class that holds the configuration for a single field. <a href="classWt_1_1WLogger_1_1Field.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1WLogger_1_1Sep.html">Sep</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Class that indicates a field separator. <a href="structWt_1_1WLogger_1_1Sep.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1WLogger_1_1TimeStamp.html">TimeStamp</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Class that indicates a time stamp. <a href="structWt_1_1WLogger_1_1TimeStamp.html#details">More...</a><br/></td></tr>
<tr><td colspan="2"><h2><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLogger.html#aa2eef50d172fa9766e3500675c814535">WLogger</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates a new logger. <a href="#aa2eef50d172fa9766e3500675c814535"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="acb96bbbeede82e03a9489f0fb1c43e38"></a><!-- doxytag: member="Wt::WLogger::~WLogger" ref="acb96bbbeede82e03a9489f0fb1c43e38" args="()" -->
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLogger.html#acb96bbbeede82e03a9489f0fb1c43e38">~WLogger</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Destructor. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLogger.html#ae851860f76c299bca96321b7d867a503">setStream</a> (std::ostream &o)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets the output stream. <a href="#ae851860f76c299bca96321b7d867a503"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLogger.html#a6d8a07bc92824fe32a123094e7516544">setFile</a> (const std::string &path)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets the output file. <a href="#a6d8a07bc92824fe32a123094e7516544"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLogger.html#a567c5b28fee703e37523898d30016f40">configure</a> (const std::string &config)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Configures what things are logged. <a href="#a567c5b28fee703e37523898d30016f40"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLogger.html#a8287b40a0699797f63de2fe5deaaae9a">addField</a> (const std::string &name, bool isString)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Adds a field. <a href="#a8287b40a0699797f63de2fe5deaaae9a"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="afbbcb96569a0296566d50c0cf1333c2c"></a><!-- doxytag: member="Wt::WLogger::fields" ref="afbbcb96569a0296566d50c0cf1333c2c" args="() const " -->
const std::vector< <a class="el" href="classWt_1_1WLogger_1_1Field.html">Field</a> > & </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLogger.html#afbbcb96569a0296566d50c0cf1333c2c">fields</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the field list. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classWt_1_1WLogEntry.html">WLogEntry</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLogger.html#a317df898dd2f2dff667f95a714dfc4f2">entry</a> (const std::string &type) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Starts a new log entry. <a href="#a317df898dd2f2dff667f95a714dfc4f2"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLogger.html#af1b255165d3c3dde6bbee91f4794444b">logging</a> (const std::string &type) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns whether messages of a given type are logged. <a href="#af1b255165d3c3dde6bbee91f4794444b"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLogger.html#a177e7096c86fec4af9ca049f7d9a0b51">logging</a> (const std::string &type, const std::string &scope) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns whether messages of a given type and scope are logged. <a href="#a177e7096c86fec4af9ca049f7d9a0b51"></a><br/></td></tr>
<tr><td colspan="2"><h2><a name="pub-static-attribs"></a>
Static Public Attributes</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="structWt_1_1WLogger_1_1Sep.html">Sep</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLogger.html#ac368dcce6c4605855bce2807aad0d267">sep</a> = <a class="el" href="structWt_1_1WLogger_1_1Sep.html">WLogger::Sep</a>()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Field separator constant. <a href="#ac368dcce6c4605855bce2807aad0d267"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static const <a class="el" href="structWt_1_1WLogger_1_1TimeStamp.html">TimeStamp</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLogger.html#a96559cbf73a0d3647aeeac6d45bcc6b0">timestamp</a> = <a class="el" href="structWt_1_1WLogger_1_1TimeStamp.html">WLogger::TimeStamp</a>()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Timestamp field constant. <a href="#a96559cbf73a0d3647aeeac6d45bcc6b0"></a><br/></td></tr>
<tr><td colspan="2"><h2><a name="related"></a>
Related Functions</h2></td></tr>
<tr><td class="ititle" colspan="2"><p>(Note that these are not member functions.) </p>
</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classWt_1_1WLogEntry.html">WLogEntry</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WLogger.html#a0d505163b2293b1a852955ce9b54f66f">log</a> (const std::string &type)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Logging function. <a href="#a0d505163b2293b1a852955ce9b54f66f"></a><br/></td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>A simple logging class. </p>
<p>This class logs events to a stream in a flexible way. It allows to create log files using the commonly used <a href="http://www.w3.org/Daemon/User/Config/Logging.html#common-logfile-format">Common Log Format</a> or <a href="http://httpd.apache.org/docs/1.3/logs.html#combined">Combined Log Format</a>, but provides a general way for logging entries that consists of a fixed number of fields.</p>
<p>It is used by Wt to create the application log (<a class="el" href="classWt_1_1WApplication.html#a75067771ba8fcc56e174f2e741ce278f" title="Adds an entry to the application log.">WApplication::log()</a>), and built-in httpd access log.</p>
<p>To use this class for custom logging, you should instantiate a logger, add one or more field definitions using <a class="el" href="classWt_1_1WLogger.html#a8287b40a0699797f63de2fe5deaaae9a" title="Adds a field.">addField()</a>, and set an output stream using <a class="el" href="classWt_1_1WLogger.html#ae851860f76c299bca96321b7d867a503" title="Sets the output stream.">setStream()</a> or <a class="el" href="classWt_1_1WLogger.html#a6d8a07bc92824fe32a123094e7516544" title="Sets the output file.">setFile()</a>. To stream data to the logger, use <a class="el" href="classWt_1_1WLogger.html#a317df898dd2f2dff667f95a714dfc4f2" title="Starts a new log entry.">entry()</a> to start formatting a new entry.</p>
<p>Usage example: </p>
<div class="fragment"><pre class="fragment"> <span class="comment">// Setup the logger</span>
<a class="code" href="classWt_1_1WLogger.html" title="A simple logging class.">Wt::WLogger</a> logger;
logger.<a class="code" href="classWt_1_1WLogger.html#a8287b40a0699797f63de2fe5deaaae9a" title="Adds a field.">addField</a>(<span class="stringliteral">"datetime"</span>, <span class="keyword">false</span>);
logger.<a class="code" href="classWt_1_1WLogger.html#a8287b40a0699797f63de2fe5deaaae9a" title="Adds a field.">addField</a>(<span class="stringliteral">"session"</span>, <span class="keyword">false</span>);
logger.<a class="code" href="classWt_1_1WLogger.html#a8287b40a0699797f63de2fe5deaaae9a" title="Adds a field.">addField</a>(<span class="stringliteral">"type"</span>, <span class="keyword">false</span>);
logger.<a class="code" href="classWt_1_1WLogger.html#a8287b40a0699797f63de2fe5deaaae9a" title="Adds a field.">addField</a>(<span class="stringliteral">"message"</span>, <span class="keyword">true</span>);
logger.<a class="code" href="classWt_1_1WLogger.html#a6d8a07bc92824fe32a123094e7516544" title="Sets the output file.">setFile</a>(<span class="stringliteral">"/tmp/mylog.txt"</span>);
<span class="comment">// Add an entry</span>
<a class="code" href="classWt_1_1WLogEntry.html" title="A stream-like object for creating an entry in a log file.">Wt::WLogEntry</a> <a class="code" href="classWt_1_1WLogger.html#a317df898dd2f2dff667f95a714dfc4f2" title="Starts a new log entry.">entry</a> = logger.<a class="code" href="classWt_1_1WLogger.html#a317df898dd2f2dff667f95a714dfc4f2" title="Starts a new log entry.">entry</a>();
entry << <a class="code" href="classWt_1_1WLogger.html#a96559cbf73a0d3647aeeac6d45bcc6b0" title="Timestamp field constant.">Wt::WLogger::timestamp</a> << <a class="code" href="classWt_1_1WLogger.html#ac368dcce6c4605855bce2807aad0d267" title="Field separator constant.">Wt::WLogger::sep</a>
<< <span class="charliteral">'['</span> << wApp->sessionId() << <span class="charliteral">']'</span> << <a class="code" href="classWt_1_1WLogger.html#ac368dcce6c4605855bce2807aad0d267" title="Field separator constant.">Wt::WLogger::sep</a>
<< <span class="charliteral">'['</span> << <span class="stringliteral">"notice"</span> << <span class="charliteral">']'</span> << <a class="code" href="classWt_1_1WLogger.html#ac368dcce6c4605855bce2807aad0d267" title="Field separator constant.">Wt::WLogger::sep</a>
<< <span class="stringliteral">"Succesfully started."</span>;
</pre></div><dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WApplication.html#a75067771ba8fcc56e174f2e741ce278f" title="Adds an entry to the application log.">WApplication::log()</a> </dd></dl>
</div><hr/><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" id="aa2eef50d172fa9766e3500675c814535"></a><!-- doxytag: member="Wt::WLogger::WLogger" ref="aa2eef50d172fa9766e3500675c814535" args="()" -->
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<td class="memname">Wt::WLogger::WLogger </td>
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<p>Creates a new logger. </p>
<p>This creates a new logger, which defaults to logging to stderr. </p>
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<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a8287b40a0699797f63de2fe5deaaae9a"></a><!-- doxytag: member="Wt::WLogger::addField" ref="a8287b40a0699797f63de2fe5deaaae9a" args="(const std::string &name, bool isString)" -->
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<td class="memname">void Wt::WLogger::addField </td>
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<p>Adds a field. </p>
<p>Add a field to the logger. When <code>isString</code> is <code>true</code>, values will be quoted. </p>
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<a class="anchor" id="a567c5b28fee703e37523898d30016f40"></a><!-- doxytag: member="Wt::WLogger::configure" ref="a567c5b28fee703e37523898d30016f40" args="(const std::string &config)" -->
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<p>Configures what things are logged. </p>
<p>The configuration is a string that defines rules for enabling or disabling certain logging. It is a white-space delimited list of rules, and each rule is of the form:</p>
<ul>
<li><code>[-]level</code> : enables (or disables) logging of messages of the given level; '*' is a wild-card that matches all levels</li>
</ul>
<ul>
<li><code>[-]level:scope</code> : enables (or disables) logging of messages of the given level and scope; '*' is a wild-card that matches all levels or scopes.</li>
</ul>
<p>The default configuration is <code>"* -debug"</code>, i.e. by default everything is logged, except for "debug" messages.</p>
<p>Some other examples:</p>
<ul>
<li><code>"* -debug debug:wthttp"</code>: logs everything, including debugging messages of scope "wthttp", but no other debugging messages.</li>
</ul>
<ul>
<li><code>"* -info -debug"</code>: disables logging of info messages in addition to debugging messages.</li>
</ul>
<dl class="note"><dt><b>Note:</b></dt><dd>The standard logging is typically configured in the configuration file, in the <log-config> block. </dd></dl>
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<a class="anchor" id="a317df898dd2f2dff667f95a714dfc4f2"></a><!-- doxytag: member="Wt::WLogger::entry" ref="a317df898dd2f2dff667f95a714dfc4f2" args="(const std::string &type) const " -->
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<td class="memname"><a class="el" href="classWt_1_1WLogEntry.html">WLogEntry</a> Wt::WLogger::entry </td>
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<p>Starts a new log entry. </p>
<p>Returns a new entry. The entry is logged in the destructor of the entry (i.e. when the entry goes out of scope).</p>
<p>The <code>type</code> reflects a logging level. You can freely choose a type, but these are commonly used inside the library:</p>
<ul>
<li>"debug": debugging info (suppressed by default)</li>
<li>"info": informational notices</li>
<li>"warning": warnings (potentially wrong API use)</li>
<li>"secure": security-related events</li>
<li>"error": errors (wrong API use, unexpected protocol messages)</li>
<li>"fatal": fatal errors (terminate the session) </li>
</ul>
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<a class="anchor" id="af1b255165d3c3dde6bbee91f4794444b"></a><!-- doxytag: member="Wt::WLogger::logging" ref="af1b255165d3c3dde6bbee91f4794444b" args="(const std::string &type) const " -->
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<td class="memname">bool Wt::WLogger::logging </td>
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<p>Returns whether messages of a given type are logged. </p>
<p>Returns <code>true</code> if messages of the given type are logged. It may be that not messages of all scopes are logged.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLogger.html#a567c5b28fee703e37523898d30016f40" title="Configures what things are logged.">configure()</a> </dd></dl>
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<a class="anchor" id="a177e7096c86fec4af9ca049f7d9a0b51"></a><!-- doxytag: member="Wt::WLogger::logging" ref="a177e7096c86fec4af9ca049f7d9a0b51" args="(const std::string &type, const std::string &scope) const " -->
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<p>Returns whether messages of a given type and scope are logged. </p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLogger.html#a567c5b28fee703e37523898d30016f40" title="Configures what things are logged.">configure()</a> </dd></dl>
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<a class="anchor" id="a6d8a07bc92824fe32a123094e7516544"></a><!-- doxytag: member="Wt::WLogger::setFile" ref="a6d8a07bc92824fe32a123094e7516544" args="(const std::string &path)" -->
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<td class="memname">void Wt::WLogger::setFile </td>
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<p>Sets the output file. </p>
<p>Opens a file output stream for <code>path</code>. The default logger outputs to stderr.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLogger.html#ae851860f76c299bca96321b7d867a503" title="Sets the output stream.">setStream()</a> </dd></dl>
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<a class="anchor" id="ae851860f76c299bca96321b7d867a503"></a><!-- doxytag: member="Wt::WLogger::setStream" ref="ae851860f76c299bca96321b7d867a503" args="(std::ostream &o)" -->
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<td class="memname">void Wt::WLogger::setStream </td>
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<p>Sets the output stream. </p>
<p>The default logger outputs to stderr.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLogger.html#a6d8a07bc92824fe32a123094e7516544" title="Sets the output file.">setFile()</a> </dd></dl>
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<hr/><h2>Friends And Related Function Documentation</h2>
<a class="anchor" id="a0d505163b2293b1a852955ce9b54f66f"></a><!-- doxytag: member="Wt::WLogger::log" ref="a0d505163b2293b1a852955ce9b54f66f" args="(const std::string &type)" -->
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<td class="memname"><a class="el" href="classWt_1_1WLogEntry.html">WLogEntry</a> log </td>
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<p>Logging function. </p>
<p>This creates a new log entry, e.g.:</p>
<div class="fragment"><pre class="fragment"> <a class="code" href="classWt_1_1WLogger.html#a0d505163b2293b1a852955ce9b54f66f" title="Logging function.">Wt::log</a>(<span class="stringliteral">"info"</span>) << <span class="stringliteral">"Doing something interesting now with "</span> << appleCount() << <span class="stringliteral">" apples."</span>;
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<hr/><h2>Member Data Documentation</h2>
<a class="anchor" id="ac368dcce6c4605855bce2807aad0d267"></a><!-- doxytag: member="Wt::WLogger::sep" ref="ac368dcce6c4605855bce2807aad0d267" args="" -->
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<td class="memname">const <a class="el" href="structWt_1_1WLogger_1_1Sep.html">WLogger::Sep</a> <a class="el" href="classWt_1_1WLogger.html#ac368dcce6c4605855bce2807aad0d267">Wt::WLogger::sep</a> = <a class="el" href="structWt_1_1WLogger_1_1Sep.html">WLogger::Sep</a>()<code> [static]</code></td>
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<p>Field separator constant. </p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLogEntry.html#af8046b0ecb69a59ae7beb9c45996f2a3" title="Writes a field separator.">WLogEntry::operator<<(const WLogger::Sep&)</a> </dd></dl>
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<a class="anchor" id="a96559cbf73a0d3647aeeac6d45bcc6b0"></a><!-- doxytag: member="Wt::WLogger::timestamp" ref="a96559cbf73a0d3647aeeac6d45bcc6b0" args="" -->
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<td class="memname">const <a class="el" href="structWt_1_1WLogger_1_1TimeStamp.html">WLogger::TimeStamp</a> <a class="el" href="classWt_1_1WLogger.html#a96559cbf73a0d3647aeeac6d45bcc6b0">Wt::WLogger::timestamp</a> = <a class="el" href="structWt_1_1WLogger_1_1TimeStamp.html">WLogger::TimeStamp</a>()<code> [static]</code></td>
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<p>Timestamp field constant. </p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WLogEntry.html#aba127b67d182be2f88d292dd65706faf" title="Writes a time stamp in the current field.">WLogEntry::operator<<(const WLogger::TimeStamp&)</a> </dd></dl>
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