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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Apache log4cxx: ErrorHandler Class Reference</title>
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<a class="el" href="namespacelog4cxx.html">log4cxx</a>::<a class="el" href="namespacelog4cxx_1_1spi.html">spi</a>::<a class="el" href="classlog4cxx_1_1spi_1_1_error_handler.html">ErrorHandler</a></div>
<h1>ErrorHandler Class Reference</h1><!-- doxytag: class="log4cxx::spi::ErrorHandler" --><!-- doxytag: inherits="log4cxx::spi::OptionHandler" -->Inherits <a class="el" href="classlog4cxx_1_1spi_1_1_option_handler.html">OptionHandler</a>.
<p>
Inherited by <a class="el" href="classlog4cxx_1_1helpers_1_1_only_once_error_handler.html">OnlyOnceErrorHandler</a><code> [virtual]</code>, and <a class="el" href="classlog4cxx_1_1varia_1_1_fallback_error_handler.html">FallbackErrorHandler</a><code> [virtual]</code>.
<p>
<a href="classlog4cxx_1_1spi_1_1_error_handler-members.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2>
Appenders may delegate their error handling to <code>ErrorHandlers</code>. 
<p>
Error handling is a particularly tedious to get right because by definition errors are hard to predict and to reproduce.<p>
Please take the time to contact the author in case you discover that errors are not properly handled. You are most welcome to suggest new error handling policies or criticize existing policies. 
<p>
<table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1spi_1_1_error_handler.html#70e018e3f27ead8d955acd70e0e11737">~ErrorHandler</a> ()</td></tr>

<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1spi_1_1_error_handler.html#657c680e0246d95168aecbe4d299822b">setLogger</a> (const <a class="el" href="classlog4cxx_1_1helpers_1_1_object_ptr_t.html">LoggerPtr</a> &amp;logger)=0</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Add a reference to a logger to which the failing appender might be attached to.  <a href="#657c680e0246d95168aecbe4d299822b"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1spi_1_1_error_handler.html#20b213d025014be558dfab7e11652825">error</a> (const <a class="el" href="namespacelog4cxx.html#d7ec98d27bca7666e23f27dd1fb181c8">LogString</a> &amp;message, const std::exception &amp;e, int errorCode) const =0</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Equivalent to the error(const String&amp;, <a class="el" href="classlog4cxx_1_1helpers_1_1_exception.html">helpers::Exception</a>&amp;, int, <a class="el" href="classlog4cxx_1_1spi_1_1_logging_event.html">spi::LoggingEvent</a>&amp;) with the the event parameteter set to null.  <a href="#20b213d025014be558dfab7e11652825"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1spi_1_1_error_handler.html#390324c11808d0cd4fee6c3967932f27">error</a> (const <a class="el" href="namespacelog4cxx.html#d7ec98d27bca7666e23f27dd1fb181c8">LogString</a> &amp;message) const =0</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">This method is normally used to just print the error message passed as a parameter.  <a href="#390324c11808d0cd4fee6c3967932f27"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1spi_1_1_error_handler.html#b087032b921fcef1735256049d38f0c1">error</a> (const <a class="el" href="namespacelog4cxx.html#d7ec98d27bca7666e23f27dd1fb181c8">LogString</a> &amp;message, const std::exception &amp;e, int errorCode, const <a class="el" href="classlog4cxx_1_1helpers_1_1_object_ptr_t.html">LoggingEventPtr</a> &amp;event) const =0</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">This method is invoked to handle the error.  <a href="#b087032b921fcef1735256049d38f0c1"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1spi_1_1_error_handler.html#bf38035eedf752b85b9ffdcf414edd64">setAppender</a> (const <a class="el" href="classlog4cxx_1_1helpers_1_1_object_ptr_t.html">AppenderPtr</a> &amp;appender)=0</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Set the appender for which errors are handled.  <a href="#bf38035eedf752b85b9ffdcf414edd64"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1spi_1_1_error_handler.html#bc2bb91894f25f42d8e1a429c8bec2bc">setBackupAppender</a> (const <a class="el" href="classlog4cxx_1_1helpers_1_1_object_ptr_t.html">AppenderPtr</a> &amp;appender)=0</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Set the appender to fallback upon in case of failure.  <a href="#bc2bb91894f25f42d8e1a429c8bec2bc"></a><br></td></tr>
</table>
<hr><h2>Constructor &amp; Destructor Documentation</h2>
<a class="anchor" name="70e018e3f27ead8d955acd70e0e11737"></a><!-- doxytag: member="log4cxx::spi::ErrorHandler::~ErrorHandler" ref="70e018e3f27ead8d955acd70e0e11737" args="()" --><p>
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          <td class="md" nowrap valign="top">virtual ~<a class="el" href="classlog4cxx_1_1spi_1_1_error_handler.html">ErrorHandler</a>           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [inline, virtual]</code></td>
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    </td>
  </tr>
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  <tr>
    <td>
      &nbsp;
    </td>
    <td>

<p>
    </td>
  </tr>
</table>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="b087032b921fcef1735256049d38f0c1"></a><!-- doxytag: member="log4cxx::spi::ErrorHandler::error" ref="b087032b921fcef1735256049d38f0c1" args="(const LogString &amp;message, const std::exception &amp;e, int errorCode, const LoggingEventPtr &amp;event) const =0" --><p>
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          <td class="md" nowrap valign="top">virtual void error           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const <a class="el" href="namespacelog4cxx.html#d7ec98d27bca7666e23f27dd1fb181c8">LogString</a> &amp;&nbsp;</td>
          <td class="mdname" nowrap> <em>message</em>, </td>
        </tr>
        <tr>
          <td class="md" nowrap align="right"></td>
          <td class="md"></td>
          <td class="md" nowrap>const std::exception &amp;&nbsp;</td>
          <td class="mdname" nowrap> <em>e</em>, </td>
        </tr>
        <tr>
          <td class="md" nowrap align="right"></td>
          <td class="md"></td>
          <td class="md" nowrap>int&nbsp;</td>
          <td class="mdname" nowrap> <em>errorCode</em>, </td>
        </tr>
        <tr>
          <td class="md" nowrap align="right"></td>
          <td class="md"></td>
          <td class="md" nowrap>const <a class="el" href="classlog4cxx_1_1helpers_1_1_object_ptr_t.html">LoggingEventPtr</a> &amp;&nbsp;</td>
          <td class="mdname" nowrap> <em>event</em></td>
        </tr>
        <tr>
          <td class="md"></td>
          <td class="md">)&nbsp;</td>
          <td class="md" colspan="2"> const<code> [pure virtual]</code></td>
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<p>
This method is invoked to handle the error. 
<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>&nbsp;</td><td>The message assoicated with the error. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>e</em>&nbsp;</td><td>The Exption that was thrown when the error occured. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>errorCode</em>&nbsp;</td><td>The error code associated with the error. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>event</em>&nbsp;</td><td>The logging event that the failing appender is asked to log. </td></tr>
  </table>
</dl>

<p>
Implemented in <a class="el" href="classlog4cxx_1_1helpers_1_1_only_once_error_handler.html#24071234bd8fa94ccab51c6ac5e246c5">OnlyOnceErrorHandler</a>, and <a class="el" href="classlog4cxx_1_1varia_1_1_fallback_error_handler.html#24071234bd8fa94ccab51c6ac5e246c5">FallbackErrorHandler</a>.    </td>
  </tr>
</table>
<a class="anchor" name="390324c11808d0cd4fee6c3967932f27"></a><!-- doxytag: member="log4cxx::spi::ErrorHandler::error" ref="390324c11808d0cd4fee6c3967932f27" args="(const LogString &amp;message) const =0" --><p>
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          <td class="md" nowrap valign="top">virtual void error           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const <a class="el" href="namespacelog4cxx.html#d7ec98d27bca7666e23f27dd1fb181c8">LogString</a> &amp;&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>message</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const<code> [pure virtual]</code></td>
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    </td>
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    <td>
      &nbsp;
    </td>
    <td>

<p>
This method is normally used to just print the error message passed as a parameter. 
<p>

<p>
Implemented in <a class="el" href="classlog4cxx_1_1helpers_1_1_only_once_error_handler.html#d92a3ce84facc670863be59563d0603d">OnlyOnceErrorHandler</a>, and <a class="el" href="classlog4cxx_1_1varia_1_1_fallback_error_handler.html#40069b80e5ee8953b25177cc3574aa4b">FallbackErrorHandler</a>.    </td>
  </tr>
</table>
<a class="anchor" name="20b213d025014be558dfab7e11652825"></a><!-- doxytag: member="log4cxx::spi::ErrorHandler::error" ref="20b213d025014be558dfab7e11652825" args="(const LogString &amp;message, const std::exception &amp;e, int errorCode) const =0" --><p>
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          <td class="md" nowrap valign="top">virtual void error           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const <a class="el" href="namespacelog4cxx.html#d7ec98d27bca7666e23f27dd1fb181c8">LogString</a> &amp;&nbsp;</td>
          <td class="mdname" nowrap> <em>message</em>, </td>
        </tr>
        <tr>
          <td class="md" nowrap align="right"></td>
          <td class="md"></td>
          <td class="md" nowrap>const std::exception &amp;&nbsp;</td>
          <td class="mdname" nowrap> <em>e</em>, </td>
        </tr>
        <tr>
          <td class="md" nowrap align="right"></td>
          <td class="md"></td>
          <td class="md" nowrap>int&nbsp;</td>
          <td class="mdname" nowrap> <em>errorCode</em></td>
        </tr>
        <tr>
          <td class="md"></td>
          <td class="md">)&nbsp;</td>
          <td class="md" colspan="2"> const<code> [pure virtual]</code></td>
        </tr>
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    </td>
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      &nbsp;
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    <td>

<p>
Equivalent to the error(const String&amp;, <a class="el" href="classlog4cxx_1_1helpers_1_1_exception.html">helpers::Exception</a>&amp;, int, <a class="el" href="classlog4cxx_1_1spi_1_1_logging_event.html">spi::LoggingEvent</a>&amp;) with the the event parameteter set to null. 
<p>

<p>
Implemented in <a class="el" href="classlog4cxx_1_1helpers_1_1_only_once_error_handler.html#9084c6c8c225845ed09867b730590514">OnlyOnceErrorHandler</a>, and <a class="el" href="classlog4cxx_1_1varia_1_1_fallback_error_handler.html#9084c6c8c225845ed09867b730590514">FallbackErrorHandler</a>.    </td>
  </tr>
</table>
<a class="anchor" name="bf38035eedf752b85b9ffdcf414edd64"></a><!-- doxytag: member="log4cxx::spi::ErrorHandler::setAppender" ref="bf38035eedf752b85b9ffdcf414edd64" args="(const AppenderPtr &amp;appender)=0" --><p>
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          <td class="md" nowrap valign="top">virtual void setAppender           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const <a class="el" href="classlog4cxx_1_1helpers_1_1_object_ptr_t.html">AppenderPtr</a> &amp;&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>appender</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [pure virtual]</code></td>
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<p>
Set the appender for which errors are handled. 
<p>
This method is usually called when the error handler is configured. 
<p>
Implemented in <a class="el" href="classlog4cxx_1_1helpers_1_1_only_once_error_handler.html#5d46275bd2a01b2102f4b03b294ec50b">OnlyOnceErrorHandler</a>, and <a class="el" href="classlog4cxx_1_1varia_1_1_fallback_error_handler.html#5e3545411b1bb167ca7c30d554cb7252">FallbackErrorHandler</a>.    </td>
  </tr>
</table>
<a class="anchor" name="bc2bb91894f25f42d8e1a429c8bec2bc"></a><!-- doxytag: member="log4cxx::spi::ErrorHandler::setBackupAppender" ref="bc2bb91894f25f42d8e1a429c8bec2bc" args="(const AppenderPtr &amp;appender)=0" --><p>
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          <td class="md" nowrap valign="top">virtual void setBackupAppender           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const <a class="el" href="classlog4cxx_1_1helpers_1_1_object_ptr_t.html">AppenderPtr</a> &amp;&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>appender</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [pure virtual]</code></td>
        </tr>
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    </td>
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      &nbsp;
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<p>
Set the appender to fallback upon in case of failure. 
<p>

<p>
Implemented in <a class="el" href="classlog4cxx_1_1helpers_1_1_only_once_error_handler.html#f5ce3a0cde4a80c96cf5dee6389550b5">OnlyOnceErrorHandler</a>, and <a class="el" href="classlog4cxx_1_1varia_1_1_fallback_error_handler.html#953bb1714ea396c901a07bbdf6a9e923">FallbackErrorHandler</a>.    </td>
  </tr>
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<a class="anchor" name="657c680e0246d95168aecbe4d299822b"></a><!-- doxytag: member="log4cxx::spi::ErrorHandler::setLogger" ref="657c680e0246d95168aecbe4d299822b" args="(const LoggerPtr &amp;logger)=0" --><p>
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          <td class="md" nowrap valign="top">virtual void setLogger           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const <a class="el" href="classlog4cxx_1_1helpers_1_1_object_ptr_t.html">LoggerPtr</a> &amp;&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>logger</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap><code> [pure virtual]</code></td>
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<p>
Add a reference to a logger to which the failing appender might be attached to. 
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The failing appender will be searched and replaced only in the loggers you add through this method.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign="top"></td><td valign="top"><em>logger</em>&nbsp;</td><td>One of the loggers that will be searched for the failing appender in view of replacement. </td></tr>
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Implemented in <a class="el" href="classlog4cxx_1_1helpers_1_1_only_once_error_handler.html#d71cb681f580c2dd0ac0b15c4c5cf979">OnlyOnceErrorHandler</a>, and <a class="el" href="classlog4cxx_1_1varia_1_1_fallback_error_handler.html#d71cb681f580c2dd0ac0b15c4c5cf979">FallbackErrorHandler</a>.    </td>
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<hr>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="errorhandler_8h.html">errorhandler.h</a></ul>
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