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<td width="20%" align="left"><a accesskey="p" href="upgrade_11gr2_52_rep_sql.html">Prev</a> </td>
<th width="60%" align="center">Chapter 12. Upgrading Berkeley DB 11.2.5.1 applications to Berkeley DB 11.2.5.2 </th>
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<h2 class="title" style="clear: both"><a id="upgrade_11gr2_52_repmgr_channels"></a>Repmgr Message Channels </h2>
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Application components running at various sites within a
replication group can now use the Replication Manager's
existing TCP/IP communications infrastructure to send and
process messages among themselves, using the
<code class="literal">DB_CHANNEL</code> handle. <a href="../api_reference/C/repmgr_channel.html" class="olink">DB_ENV->repmgr_channel()</a>
is used to create the <code class="literal">DB_CHANNEL</code> handle.
<a href="../api_reference/C/dbchannel_send_msg.html" class="olink">DB_CHANNEL->send_msg()</a> and <a href="../api_reference/C/dbchannel_send_request.html" class="olink">DB_CHANNEL->send_request()</a> are used to
send sychronous and asychronous messages that are handled by
the function set by <a href="../api_reference/C/repmgr_msg_dispatch.html" class="olink">DB_ENV->repmgr_msg_dispatch()</a>.
<a href="../api_reference/C/dbchannel_set_timeout.html" class="olink">DB_CHANNEL->set_timeout()</a> is used to configure channel time out,
and <a href="../api_reference/C/dbchannel_close.html" class="olink">DB_CHANNEL->close()</a> closes the channel and frees resources
held by it.
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<a href="../api_reference/C/repmgr_msg_dispatch.html" class="olink">DB_ENV->repmgr_msg_dispatch()</a>
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