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<title>Apache log4cxx: SocketAppender Class Reference</title>
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<a class="el" href="namespacelog4cxx.html">log4cxx</a>::<a class="el" href="namespacelog4cxx_1_1net.html">net</a>::<a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html">SocketAppender</a></div>
<h1>SocketAppender Class Reference</h1><!-- doxytag: class="log4cxx::net::SocketAppender" --><!-- doxytag: inherits="log4cxx::net::SocketAppenderSkeleton" -->Inherits <a class="el" href="classlog4cxx_1_1net_1_1_socket_appender_skeleton.html">SocketAppenderSkeleton</a>.
<p>
<a href="classlog4cxx_1_1net_1_1_socket_appender-members.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2>
Sends <a class="el" href="classlog4cxx_1_1spi_1_1_logging_event.html">LoggingEvent</a> objects to a remote a log server, usually Apache Chainsaw.
<p>
The <a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html">SocketAppender</a> has the following properties:<p>
<ul>
<li>If sent to Apache Chainsaw, remote logging is non-intrusive as far as the log event is concerned. In other words, the event will be logged with the same time stamp, <a class="el" href="classlog4cxx_1_1_n_d_c.html">NDC</a>, location info as if it were logged locally by the client.</li></ul>
<p>
<ul>
<li>SocketAppenders do not use a layout. They ship a serialized <a class="el" href="classlog4cxx_1_1spi_1_1_logging_event.html">LoggingEvent</a> object to the server side.</li></ul>
<p>
<ul>
<li>Remote logging uses the TCP protocol. Consequently, if the server is reachable, then log events will eventually arrive at the server.</li></ul>
<p>
<ul>
<li>If the remote server is down, the logging requests are simply dropped. However, if and when the server comes back up, then event transmission is resumed transparently. This transparent reconneciton is performed by a <em>connector</em> thread which periodically attempts to connect to the server.</li></ul>
<p>
<ul>
<li>Logging events are automatically <em>buffered</em> by the native TCP implementation. This means that if the link to server is slow but still faster than the rate of (log) event production by the client, the client will not be affected by the slow network connection. However, if the network connection is slower then the rate of event production, then the client can only progress at the network rate. In particular, if the network link to the the server is down, the client will be blocked. <br>
<br>
On the other hand, if the network link is up, but the server is down, the client will not be blocked when making log requests but the log events will be lost due to server unavailability.</li></ul>
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<ul>
<li>Even if a <code><a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html">SocketAppender</a></code> is no longer attached to any logger, it will not be destroyed in the presence of a connector thread. A connector thread exists only if the connection to the server is down. To avoid this destruction problem, you should <a class="el" href="classlog4cxx_1_1net_1_1_socket_appender_skeleton.html#5ae591df94fc66ccb85cbb6565368bca">close</a> the the <code><a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html">SocketAppender</a></code> explicitly. See also next item. <br>
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Long lived applications which create/destroy many <code><a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html">SocketAppender</a></code> instances should be aware of this destruction problem. Most other applications can safely ignore it.</li></ul>
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<ul>
<li>If the application hosting the <code><a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html">SocketAppender</a></code> exits before the <code><a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html">SocketAppender</a></code> is closed either explicitly or subsequent to destruction, then there might be untransmitted data in the pipe which might be lost. <br>
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To avoid lost data, it is usually sufficient to <a class="el" href="classlog4cxx_1_1net_1_1_socket_appender_skeleton.html#5ae591df94fc66ccb85cbb6565368bca">close</a> the <code><a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html">SocketAppender</a></code> either explicitly or by calling the <a class="el" href="classlog4cxx_1_1_log_manager.html#62d41be4b41bfdb31fb9d8b017c5363a">LogManager::shutdown</a> method before exiting the application. </li></ul>
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<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html#c1ec5c6630aef196b08cfadf50bb8e96">SocketAppender</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html#c26fd03e92578d2e5063b3880f9e2042">~SocketAppender</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html#5834c59ea27f900e3702a42e03712007">SocketAppender</a> (helpers::InetAddressPtr &amp;address, int port)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Connects to remote server at <code>address</code> and <code>port</code>. <a href="#5834c59ea27f900e3702a42e03712007"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html#31b40a0cee8762dd8e6508f48db47926">SocketAppender</a> (const <a class="el" href="namespacelog4cxx.html#d7ec98d27bca7666e23f27dd1fb181c8">LogString</a> &amp;host, int port)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Connects to remote server at <code>host</code> and <code>port</code>. <a href="#31b40a0cee8762dd8e6508f48db47926"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Static Public Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static int&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html#99b0a86e5516b7e6714faaf444cfd2be">DEFAULT_PORT</a></td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">The default port number of remote logging server (4560). <a href="#99b0a86e5516b7e6714faaf444cfd2be"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static int&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html#d40c219e214e2824f320cf7f532ce735">DEFAULT_RECONNECTION_DELAY</a></td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">The default reconnection delay (30000 milliseconds or 30 seconds). <a href="#d40c219e214e2824f320cf7f532ce735"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Protected Member Functions</h2></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_1net_1_1_socket_appender.html#547de53d1d112be4473619d1d1f1989b">setSocket</a> (log4cxx::helpers::SocketPtr &amp;socket, <a class="el" href="classlog4cxx_1_1helpers_1_1_pool.html">log4cxx::helpers::Pool</a> &amp;p)</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_1net_1_1_socket_appender.html#341776e04cf186fa34ce9dc56421ce1c">cleanUp</a> (<a class="el" href="classlog4cxx_1_1helpers_1_1_pool.html">log4cxx::helpers::Pool</a> &amp;p)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual int&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html#7b76ff47dd182569171ec8bb6167a63d">getDefaultDelay</a> () const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual int&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html#f2f7856d78b85af569c2e23522311203">getDefaultPort</a> () const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html#b862691b0ebb1d0ff98085b10b021781">append</a> (const <a class="el" href="classlog4cxx_1_1helpers_1_1_object_ptr_t.html">spi::LoggingEventPtr</a> &amp;event, <a class="el" href="classlog4cxx_1_1helpers_1_1_pool.html">log4cxx::helpers::Pool</a> &amp;<a class="el" href="classlog4cxx_1_1_appender_skeleton.html#6c72571775abf91a74fade4e2c2b9af8">pool</a>)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Subclasses of <code><a class="el" href="classlog4cxx_1_1_appender_skeleton.html">AppenderSkeleton</a></code> should implement this method to perform actual logging. <a href="#b862691b0ebb1d0ff98085b10b021781"></a><br></td></tr>
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<hr><h2>Constructor &amp; Destructor Documentation</h2>
<a class="anchor" name="c1ec5c6630aef196b08cfadf50bb8e96"></a><!-- doxytag: member="log4cxx::net::SocketAppender::SocketAppender" ref="c1ec5c6630aef196b08cfadf50bb8e96" args="()" --><p>
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<td class="md" nowrap valign="top"><a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html">SocketAppender</a> </td>
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<a class="anchor" name="c26fd03e92578d2e5063b3880f9e2042"></a><!-- doxytag: member="log4cxx::net::SocketAppender::~SocketAppender" ref="c26fd03e92578d2e5063b3880f9e2042" args="()" --><p>
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<td class="md" nowrap valign="top">~<a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html">SocketAppender</a> </td>
<td class="md" valign="top">(&nbsp;</td>
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<a class="anchor" name="5834c59ea27f900e3702a42e03712007"></a><!-- doxytag: member="log4cxx::net::SocketAppender::SocketAppender" ref="5834c59ea27f900e3702a42e03712007" args="(helpers::InetAddressPtr &amp;address, int port)" --><p>
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<td class="md" nowrap valign="top"><a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html">SocketAppender</a> </td>
<td class="md" valign="top">(&nbsp;</td>
<td class="md" nowrap valign="top">helpers::InetAddressPtr &amp;&nbsp;</td>
<td class="mdname" nowrap> <em>address</em>, </td>
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<td class="md" nowrap>int&nbsp;</td>
<td class="mdname" nowrap> <em>port</em></td>
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Connects to remote server at <code>address</code> and <code>port</code>.
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<a class="anchor" name="31b40a0cee8762dd8e6508f48db47926"></a><!-- doxytag: member="log4cxx::net::SocketAppender::SocketAppender" ref="31b40a0cee8762dd8e6508f48db47926" args="(const LogString &amp;host, int port)" --><p>
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<td class="md" nowrap valign="top"><a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html">SocketAppender</a> </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>host</em>, </td>
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<td class="md" nowrap>int&nbsp;</td>
<td class="mdname" nowrap> <em>port</em></td>
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Connects to remote server at <code>host</code> and <code>port</code>.
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="b862691b0ebb1d0ff98085b10b021781"></a><!-- doxytag: member="log4cxx::net::SocketAppender::append" ref="b862691b0ebb1d0ff98085b10b021781" args="(const spi::LoggingEventPtr &amp;event, log4cxx::helpers::Pool &amp;pool)" --><p>
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<td class="md" nowrap valign="top">void append </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">spi::LoggingEventPtr</a> &amp;&nbsp;</td>
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Subclasses of <code><a class="el" href="classlog4cxx_1_1_appender_skeleton.html">AppenderSkeleton</a></code> should implement this method to perform actual logging.
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See also <a class="el" href="classlog4cxx_1_1_appender_skeleton.html#2df87e9db87ebe5396ea94fb9c25c488">AppenderSkeleton::doAppend</a> method.
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Implements <a class="el" href="classlog4cxx_1_1_appender_skeleton.html#4c08a91d859f636117f07463bb53fe41">AppenderSkeleton</a>. </td>
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<a class="anchor" name="341776e04cf186fa34ce9dc56421ce1c"></a><!-- doxytag: member="log4cxx::net::SocketAppender::cleanUp" ref="341776e04cf186fa34ce9dc56421ce1c" args="(log4cxx::helpers::Pool &amp;p)" --><p>
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<td class="md" nowrap valign="top">virtual void cleanUp </td>
<td class="md" valign="top">(&nbsp;</td>
<td class="md" nowrap valign="top"><a class="el" href="classlog4cxx_1_1helpers_1_1_pool.html">log4cxx::helpers::Pool</a> &amp;&nbsp;</td>
<td class="mdname1" valign="top" nowrap> <em>p</em> </td>
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Implements <a class="el" href="classlog4cxx_1_1net_1_1_socket_appender_skeleton.html#79a92843f641b5c13c0734a077bfb605">SocketAppenderSkeleton</a>. </td>
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<a class="anchor" name="7b76ff47dd182569171ec8bb6167a63d"></a><!-- doxytag: member="log4cxx::net::SocketAppender::getDefaultDelay" ref="7b76ff47dd182569171ec8bb6167a63d" args="() const " --><p>
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<td class="md" nowrap valign="top">virtual int getDefaultDelay </td>
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Implements <a class="el" href="classlog4cxx_1_1net_1_1_socket_appender_skeleton.html#a3d1a578110fb371105e947a516bf0f2">SocketAppenderSkeleton</a>. </td>
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<a class="anchor" name="f2f7856d78b85af569c2e23522311203"></a><!-- doxytag: member="log4cxx::net::SocketAppender::getDefaultPort" ref="f2f7856d78b85af569c2e23522311203" args="() const " --><p>
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<td class="md" nowrap valign="top">virtual int getDefaultPort </td>
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Implements <a class="el" href="classlog4cxx_1_1net_1_1_socket_appender_skeleton.html#a9bebbee10abd4307deb98cea3baa08c">SocketAppenderSkeleton</a>. </td>
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<a class="anchor" name="547de53d1d112be4473619d1d1f1989b"></a><!-- doxytag: member="log4cxx::net::SocketAppender::setSocket" ref="547de53d1d112be4473619d1d1f1989b" args="(log4cxx::helpers::SocketPtr &amp;socket, log4cxx::helpers::Pool &amp;p)" --><p>
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<td class="md" nowrap valign="top">virtual void setSocket </td>
<td class="md" valign="top">(&nbsp;</td>
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<td class="mdname" nowrap> <em>socket</em>, </td>
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<td class="md">)&nbsp;</td>
<td class="md" colspan="2"><code> [protected, virtual]</code></td>
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<p>
<p>
Implements <a class="el" href="classlog4cxx_1_1net_1_1_socket_appender_skeleton.html#9077a15836f082b3e26fc25de4bea5ee">SocketAppenderSkeleton</a>. </td>
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<hr><h2>Member Data Documentation</h2>
<a class="anchor" name="99b0a86e5516b7e6714faaf444cfd2be"></a><!-- doxytag: member="log4cxx::net::SocketAppender::DEFAULT_PORT" ref="99b0a86e5516b7e6714faaf444cfd2be" args="" --><p>
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<td class="md" nowrap valign="top">int <a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html#99b0a86e5516b7e6714faaf444cfd2be">DEFAULT_PORT</a><code> [static]</code> </td>
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<p>
The default port number of remote logging server (4560).
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<a class="anchor" name="d40c219e214e2824f320cf7f532ce735"></a><!-- doxytag: member="log4cxx::net::SocketAppender::DEFAULT_RECONNECTION_DELAY" ref="d40c219e214e2824f320cf7f532ce735" args="" --><p>
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<td class="md" nowrap valign="top">int <a class="el" href="classlog4cxx_1_1net_1_1_socket_appender.html#d40c219e214e2824f320cf7f532ce735">DEFAULT_RECONNECTION_DELAY</a><code> [static]</code> </td>
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The default reconnection delay (30000 milliseconds or 30 seconds).
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<hr>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="socketappender_8h.html">socketappender.h</a></ul>
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