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191 lines
8.6 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>Base API Methods</title>
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<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB Programmer's Reference Guide" />
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<link rel="up" href="rep.html" title="Chapter 12. Berkeley DB Replication" />
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<link rel="prev" href="rep_mgr_meth.html" title="Replication Manager methods" />
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<link rel="next" href="rep_comm.html" title="Building the communications infrastructure" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.2</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">Base API Methods</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="rep_mgr_meth.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 12.
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Berkeley DB Replication
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="rep_comm.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="rep_base_meth"></a>Base API Methods</h2>
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</div>
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</div>
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</div>
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<p>Base API applications use the following
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Berkeley DB methods.</p>
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<div class="variablelist">
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<dl>
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<dt>
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<span class="term">
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<a href="../api_reference/C/reptransport.html" class="olink">DB_ENV->rep_set_transport()</a>
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</span>
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</dt>
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<dd>
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<p>
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The <a href="../api_reference/C/reptransport.html" class="olink">DB_ENV->rep_set_transport()</a> method configures the replication system's
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communications infrastructure.
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</p>
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</dd>
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<dt>
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<span class="term">
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<a href="../api_reference/C/repstart.html" class="olink">DB_ENV->rep_start()</a>
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</span>
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</dt>
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<dd>
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<p>
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The <a href="../api_reference/C/repstart.html" class="olink">DB_ENV->rep_start()</a> method configures (or reconfigures) an existing database
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environment to be a replication master or client.
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</p>
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</dd>
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<dt>
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<span class="term">
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<a href="../api_reference/C/repmessage.html" class="olink">DB_ENV->rep_process_message()</a>
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</span>
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</dt>
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<dd>
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<p>
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The <a href="../api_reference/C/repmessage.html" class="olink">DB_ENV->rep_process_message()</a> method is used to process incoming messages
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from other environments in the replication group. For clients,
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it is responsible for accepting log records and updating the
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local databases based on messages from the master. For both
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the master and the clients, it is responsible for handling
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administrative functions (for example, the protocol for dealing
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with lost messages), and permitting new clients to join an
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active replication group. This method should only be called
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after the replication system's communications infrastructure
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has been configured via <a href="../api_reference/C/reptransport.html" class="olink">DB_ENV->rep_set_transport()</a>.
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</p>
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</dd>
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<dt>
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<span class="term">
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<a href="../api_reference/C/repelect.html" class="olink">DB_ENV->rep_elect()</a>
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</span>
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</dt>
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<dd>
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<p>
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The <a href="../api_reference/C/repelect.html" class="olink">DB_ENV->rep_elect()</a> method causes the replication group to elect a
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new master; it is called whenever contact with the master is
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lost and the application wants the remaining sites to select a
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new master.
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</p>
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</dd>
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<dt>
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<span class="term">
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<a href="../api_reference/C/envevent_notify.html" class="olink">DB_ENV->set_event_notify()</a>
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</span>
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</dt>
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<dd>
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<p>
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The <a href="../api_reference/C/envevent_notify.html" class="olink">DB_ENV->set_event_notify()</a> method is needed for applications to
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discover important replication-related events, such as the
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result of an election and appointment of a new master.
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</p>
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</dd>
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<dt>
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<span class="term">
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<a href="../api_reference/C/reppriority.html" class="olink">DB_ENV->rep_set_priority()</a>
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</span>
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</dt>
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<dd>
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<p>
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The <a href="../api_reference/C/reppriority.html" class="olink">DB_ENV->rep_set_priority()</a> method configures the local site's priority for
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the purpose of elections.
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</p>
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</dd>
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<dt>
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<span class="term">
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<a href="../api_reference/C/repset_timeout.html" class="olink">DB_ENV->rep_set_timeout()</a>
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</span>
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</dt>
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<dd>
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<p>
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This method optionally configures various timeout values. Otherwise
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default timeout values as specified in <a href="../api_reference/C/repset_timeout.html" class="olink">DB_ENV->rep_set_timeout()</a> are
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used.
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</p>
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</dd>
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<dt>
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<span class="term">
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<a href="../api_reference/C/repset_limit.html" class="olink">DB_ENV->rep_set_limit()</a>
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</span>
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</dt>
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<dd>
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<p>
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The <a href="../api_reference/C/repset_limit.html" class="olink">DB_ENV->rep_set_limit()</a> method imposes an upper bound on the amount of
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data that will be sent in response to a single call to
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<a href="../api_reference/C/repmessage.html" class="olink">DB_ENV->rep_process_message()</a>. During client recovery, that is, when a replica
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site is trying to synchronize with the master, clients may ask
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the master for a large number of log records. If it is going
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to harm an application for the master message loop to remain
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busy for an extended period transmitting records to the
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replica, then the application will want to use <a href="../api_reference/C/repset_limit.html" class="olink">DB_ENV->rep_set_limit()</a> to
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limit the amount of data the master will send before
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relinquishing control and accepting other messages.
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</p>
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</dd>
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<dt>
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<span class="term">
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<a href="../api_reference/C/repset_request.html" class="olink">DB_ENV->rep_set_request()</a>
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</span>
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</dt>
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<dd>
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<p>
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This method sets a threshold for the minimum and maximum time that
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a client waits before requesting retransmission of a missing
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message.
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</p>
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</dd>
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</dl>
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</div>
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<p>In addition to the methods previously described, Base API applications
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may also call the following methods, as needed:
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<a href="../api_reference/C/repstat.html" class="olink">DB_ENV->rep_stat()</a>, <a href="../api_reference/C/repsync.html" class="olink">DB_ENV->rep_sync()</a> and <a href="../api_reference/C/repconfig.html" class="olink">DB_ENV->rep_set_config()</a>.</p>
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</div>
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<div class="navfooter">
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<hr />
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||
<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="rep_mgr_meth.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="rep.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="rep_comm.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">Replication Manager methods </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> Building the communications infrastructure</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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