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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>log4cpp: log4cpp::NDC Class Reference</title>
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<a class="el" href="namespacelog4cpp.html">log4cpp</a>::<a class="el" href="classlog4cpp_1_1NDC.html">NDC</a></div>
<h1>log4cpp::NDC Class Reference</h1>The <a class="el" href="classlog4cpp_1_1NDC.html">NDC</a> class implements <em>nested diagnostic contexts</em> as defined by Neil Harrison in the article "Patterns for Logging Diagnostic Messages" part of the book "<em>Pattern Languages of Program Design 3</em>" edited by Martin et al.
<a href="#_details">More...</a>
<p>
<code>#include <<a class="el" href="NDC_8hh-source.html">NDC.hh</a>></code>
<p>
<a href="classlog4cpp_1_1NDC-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Public Types</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">typedef std::vector< <a class="el" href="structlog4cpp_1_1NDC_1_1DiagnosticContext.html">DiagnosticContext</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#w0">ContextStack</a></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#a0">NDC</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#a1">~NDC</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#a2">_clear</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="classlog4cpp_1_1NDC.html#w0">ContextStack</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#a3">_cloneStack</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual const std::string & </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#a4">_get</a> () const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#a5">_getDepth</a> () const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#a6">_inherit</a> (<a class="el" href="classlog4cpp_1_1NDC.html#w0">ContextStack</a> *stack)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#a7">_pop</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#a8">_push</a> (const std::string &message)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#a9">_setMaxDepth</a> (int maxDepth)</td></tr>
<tr><td colspan="2"><br><h2>Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#e0">clear</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Clear any nested disgnostic information if any. <a href="#e0"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static <a class="el" href="classlog4cpp_1_1NDC.html#w0">ContextStack</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#e1">cloneStack</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Clone the diagnostic context for the current thread. <a href="#e1"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static const std::string & </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#e2">get</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the current diagnostic context string. <a href="#e2"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#e3">getDepth</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the current nesting depth of this diagnostic context. <a href="#e3"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#e4">inherit</a> (<a class="el" href="classlog4cpp_1_1NDC.html#w0">ContextStack</a> *stack)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#e5">pop</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Clients should call this method before leaving a diagnostic context. <a href="#e5"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#e6">push</a> (const std::string &message)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Push new diagnostic context information for the current thread. <a href="#e6"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#e7">setMaxDepth</a> (int maxDepth)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the maximum nesting depth for the current <a class="el" href="classlog4cpp_1_1NDC.html">NDC</a>. <a href="#e7"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static <a class="el" href="classlog4cpp_1_1NDC.html">NDC</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#e8">getNDC</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the <a class="el" href="classlog4cpp_1_1NDC.html">NDC</a> for the current thread. <a href="#e8"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Public Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classlog4cpp_1_1NDC.html#w0">ContextStack</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cpp_1_1NDC.html#o0">_stack</a></td></tr>
<tr><td colspan="2"><br><h2>Classes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct </td><td class="memItemRight" valign="bottom"><a class="el" href="structlog4cpp_1_1NDC_1_1DiagnosticContext.html">DiagnosticContext</a></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
The <a class="el" href="classlog4cpp_1_1NDC.html">NDC</a> class implements <em>nested diagnostic contexts</em> as defined by Neil Harrison in the article "Patterns for Logging Diagnostic Messages" part of the book "<em>Pattern Languages of Program Design 3</em>" edited by Martin et al.
<p>
A Nested Diagnostic Context, or <a class="el" href="classlog4cpp_1_1NDC.html">NDC</a> in short, is an instrument to distinguish interleaved log output from different sources. Log output is typically interleaved when a server handles multiple clients near-simulatanously.<p>
Interleaved log output can still be meaningful if each log entry from different contexts had a distinctive stamp. This is where NDCs come into play.<p>
<em><b>Note that NDCs are managed on a per thread basis</b></em>. <a class="el" href="classlog4cpp_1_1NDC.html">NDC</a> operations such as <code>push</code>, <code> pop</code>, <code>clear</code>, <code>getDepth</code> and <code> setMaxDepth</code> affect the <a class="el" href="classlog4cpp_1_1NDC.html">NDC</a> of the <em>current</em> thread only. NDCs of other threads remain unaffected.<p>
To build an <a class="el" href="classlog4cpp_1_1NDC.html">NDC</a> one uses the <code>push</code> operation. Simply put,<p>
<ul>
<li>
Contexts can be nested.<p>
<p>
</li>
<li>
When entering a context, call <code><a class="el" href="classlog4cpp_1_1NDC.html#e6">NDC.push</a></code>. As a side effect, if there is no nested diagnostic context for the current thread, this method will create it.<p>
<p>
</li>
<li>
When leaving a context, call <code><a class="el" href="classlog4cpp_1_1NDC.html#e5">NDC.pop</a></code>. </li>
</ul>
<p>
There is no penalty for forgetting to match each <code>push</code> operation with a corresponding <code>pop</code>, except the obvious mismatch between the real application context and the context set in the <a class="el" href="classlog4cpp_1_1NDC.html">NDC</a>.<p>
Custom Layouts may include the nested diagnostic context for the current thread in log messages, without any user intervention. Hence, even if a server is serving multiple clients simultaneously, the logs emanating from the same code (belonging to the same category) can still be distinguished because each client request will have a different <a class="el" href="classlog4cpp_1_1NDC.html">NDC</a> tag.<p>
<em>Unfortunately, unlike Java, C++ does not have platform independent multithreading support. Therefore, currently <a class="el" href="namespacelog4cpp.html">log4cpp</a> is not multithread aware, it implicitly assumes only one thread exists, the main process thread. </em>
<p>
<hr><h2>Member Typedef Documentation</h2>
<a class="anchor" name="w0" doxytag="log4cpp::NDC::ContextStack"></a><p>
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<td class="md" nowrap valign="top">typedef std::vector<<a class="el" href="structlog4cpp_1_1NDC_1_1DiagnosticContext.html">DiagnosticContext</a>> <a class="el" href="classlog4cpp_1_1NDC.html#w0">log4cpp::NDC::ContextStack</a> </td>
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<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="a0" doxytag="log4cpp::NDC::NDC"></a><p>
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="a2" doxytag="log4cpp::NDC::_clear"></a><p>
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<td class="md" nowrap valign="top">void log4cpp::NDC::_clear </td>
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<td class="md" nowrap valign="top"><a class="el" href="classlog4cpp_1_1NDC.html#w0">NDC::ContextStack</a> * log4cpp::NDC::_cloneStack </td>
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<a class="anchor" name="a7" doxytag="log4cpp::NDC::_pop"></a><p>
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<td class="md" nowrap valign="top">std::string log4cpp::NDC::_pop </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [virtual]</code></td>
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<a class="anchor" name="a8" doxytag="log4cpp::NDC::_push"></a><p>
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<td class="md" nowrap valign="top">void log4cpp::NDC::_push </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const std::string & </td>
<td class="mdname1" valign="top" nowrap> <em>message</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [virtual]</code></td>
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<a class="anchor" name="a9" doxytag="log4cpp::NDC::_setMaxDepth"></a><p>
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<td class="md" nowrap valign="top">void log4cpp::NDC::_setMaxDepth </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">int </td>
<td class="mdname1" valign="top" nowrap> <em>maxDepth</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [virtual]</code></td>
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<a class="anchor" name="e0" doxytag="log4cpp::NDC::clear"></a><p>
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<td class="md" nowrap valign="top">void log4cpp::NDC::clear </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [static]</code></td>
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<p>
Clear any nested disgnostic information if any.
<p>
This method is useful in cases where the same thread can be potentially used over and over in different unrelated contexts.<p>
This method is equivalent to calling the <code>setMaxDepth</code> method with a zero <code>maxDepth</code> argument. </td>
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<a class="anchor" name="e1" doxytag="log4cpp::NDC::cloneStack"></a><p>
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<td class="md" nowrap valign="top"><a class="el" href="classlog4cpp_1_1NDC.html#w0">NDC::ContextStack</a> * log4cpp::NDC::cloneStack </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [static]</code></td>
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<p>
Clone the diagnostic context for the current thread.
<p>
Internally a diagnostic context is represented as a stack. A given thread can supply the stack (i.e. diagnostic context) to a child thread so that the child can inherit the parent thread's diagnostic context.<p>
The child thread uses the <code>inherit</code> method to inherit the parent's diagnostic context.<p>
<dl compact><dt><b>Returns:</b></dt><dd>Stack A clone of the current thread's diagnostic context. </dd></dl>
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<a class="anchor" name="e2" doxytag="log4cpp::NDC::get"></a><p>
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<td class="md" nowrap valign="top">const std::string & log4cpp::NDC::get </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [static]</code></td>
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<p>
Get the current diagnostic context string.
<p>
<dl compact><dt><b>Returns:</b></dt><dd>the context string. </dd></dl>
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<a class="anchor" name="e3" doxytag="log4cpp::NDC::getDepth"></a><p>
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<td class="md" nowrap valign="top">size_t log4cpp::NDC::getDepth </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [static]</code></td>
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<p>
Get the current nesting depth of this diagnostic context.
<p>
<dl compact><dt><b>Returns:</b></dt><dd>the nesting depth </dd></dl>
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<a class="anchor" name="e8" doxytag="log4cpp::NDC::getNDC"></a><p>
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<td class="md" nowrap valign="top"><a class="el" href="classlog4cpp_1_1NDC.html">NDC</a> & log4cpp::NDC::getNDC </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [static]</code></td>
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<p>
Return the <a class="el" href="classlog4cpp_1_1NDC.html">NDC</a> for the current thread.
<p>
<dl compact><dt><b>Returns:</b></dt><dd>the <a class="el" href="classlog4cpp_1_1NDC.html">NDC</a> for the current thread </dd></dl>
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<a class="anchor" name="e4" doxytag="log4cpp::NDC::inherit"></a><p>
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<td class="md" nowrap valign="top">void log4cpp::NDC::inherit </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="classlog4cpp_1_1NDC.html#w0">ContextStack</a> * </td>
<td class="mdname1" valign="top" nowrap> <em>stack</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [static]</code></td>
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<a class="anchor" name="e5" doxytag="log4cpp::NDC::pop"></a><p>
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<td class="md" nowrap valign="top">std::string log4cpp::NDC::pop </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [static]</code></td>
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</td>
<td>
<p>
Clients should call this method before leaving a diagnostic context.
<p>
The returned value is the value that was pushed last. If no context is available, then the empty string "" is returned.<p>
<dl compact><dt><b>Returns:</b></dt><dd>String The innermost diagnostic context. </dd></dl>
</td>
</tr>
</table>
<a class="anchor" name="e6" doxytag="log4cpp::NDC::push"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
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<td class="md" nowrap valign="top">void log4cpp::NDC::push </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const std::string & </td>
<td class="mdname1" valign="top" nowrap> <em>message</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [static]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Push new diagnostic context information for the current thread.
<p>
The contents of the <code>message</code> parameter is determined solely by the client.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>message</em> </td><td>The new diagnostic context information. </td></tr>
</table>
</dl>
</td>
</tr>
</table>
<a class="anchor" name="e7" doxytag="log4cpp::NDC::setMaxDepth"></a><p>
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<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top">void log4cpp::NDC::setMaxDepth </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">int </td>
<td class="mdname1" valign="top" nowrap> <em>maxDepth</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [static]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
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<td>
</td>
<td>
<p>
Set the maximum nesting depth for the current <a class="el" href="classlog4cpp_1_1NDC.html">NDC</a>.
<p>
Curently NDCs do not enforce a maximum depth and consequentially this method has no effect. <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>maxDepth</em> </td><td>the maximum nesting depth </td></tr>
</table>
</dl>
</td>
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<hr><h2>Member Data Documentation</h2>
<a class="anchor" name="o0" doxytag="log4cpp::NDC::_stack"></a><p>
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<td class="md" nowrap valign="top"><a class="el" href="classlog4cpp_1_1NDC.html#w0">ContextStack</a> <a class="el" href="classlog4cpp_1_1NDC.html#o0">log4cpp::NDC::_stack</a> </td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
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<td>
</td>
<td>
<p>
</td>
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<hr>The documentation for this class was generated from the following files:<ul>
<li><a class="el" href="NDC_8hh-source.html">NDC.hh</a><li><a class="el" href="NDC_8cpp.html">NDC.cpp</a></ul>
<hr size="1"><address style="align: right;"><small>Generated on Fri Jul 29 14:12:28 2005 for log4cpp by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </small></address>
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