greg/libdb
1
0
Fork 0
mirror of https://github.com/berkeleydb/libdb.git synced 2024-11-17 01:26:25 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions
libdb/docs/api_reference/C/repmgr_msg_dispatch.html

257 lines
10 KiB
HTML
Raw Normal View History

Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>DB_ENV-&gt;repmgr_msg_dispatch()</title>
<link rel="stylesheet" href="apiReference.css" type="text/css" />
<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
<link rel="start" href="index.html" title="Berkeley DB C API Reference" />
<link rel="up" href="rep.html" title="Chapter 10.  Replication Methods" />
<link rel="prev" href="repmgrget_ack_policy.html" title="DB_ENV-&gt;repmgr_get_ack_policy()" />
<link rel="next" href="repmgrset_ack_policy.html" title="DB_ENV-&gt;repmgr_set_ack_policy()" />
</head>
<body>
<div xmlns="" class="navheader">
<div class="libver">
<p>Library Version 11.2.5.2</p>
</div>
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">DB_ENV-&gt;repmgr_msg_dispatch()</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="repmgrget_ack_policy.html">Prev</a> </td>
<th width="60%" align="center">Chapter 10. 
Replication Methods
</th>
<td width="20%" align="right"> <a accesskey="n" href="repmgrset_ack_policy.html">Next</a></td>
</tr>
</table>
<hr />
</div>
<div class="sect1" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both"><a id="repmgr_msg_dispatch"></a>DB_ENV-&gt;repmgr_msg_dispatch()</h2>
</div>
</div>
</div>
<pre class="programlisting">#include &lt;db.h&gt;
int
DB_ENV-&gt;repmgr_msg_dispatch(DB_ENV *env,
void (*msg_dispatch_fcn) (DB_ENV *env, DB_CHANNEL *channel,
DBT *request, u_int32_t nrequest,
u_int32_t cb_flags),
u_int32_t flags); </pre>
<p>
Sets the message dispatch function. This function is responsible
for receiving messages sent from remote sites using either the
<a class="xref" href="dbchannel_send_msg.html" title="DB_CHANNEL-&gt;send_msg()">DB_CHANNEL-&gt;send_msg()</a>
or
<a class="xref" href="dbchannel_send_request.html" title="DB_CHANNEL-&gt;send_request()">DB_CHANNEL-&gt;send_request()</a>
methods. If the message received by this function was sent using the
<a class="xref" href="dbchannel_send_msg.html" title="DB_CHANNEL-&gt;send_msg()">DB_CHANNEL-&gt;send_msg()</a>
method then no response is required. If the message was sent using the
<a class="xref" href="dbchannel_send_request.html" title="DB_CHANNEL-&gt;send_request()">DB_CHANNEL-&gt;send_request()</a>
method, then this function must send a response using the
<a class="xref" href="dbchannel_send_msg.html" title="DB_CHANNEL-&gt;send_msg()">DB_CHANNEL-&gt;send_msg()</a>
method.
</p>
<p>
For best results, the
<code class="methodname">DB_ENV-&gt;repmgr_msg_dispatch()</code> method should
be called before the Replication Manager has been started.
</p>
<p>
The <code class="methodname">DB_ENV-&gt;repmgr_msg_dispatch()</code> <span>
<span>
method returns a non-zero error value on failure and 0 on success.
</span>
</span>
</p>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.2.36 on 9/14/2022
2011-12-20 00:07:10 +00:00
<h3 class="title"><a id="id3753040"></a>Parameters</h3>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
</div>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.2.36 on 9/14/2022
2011-12-20 00:07:10 +00:00
<h4 class="title"><a id="id3753029"></a>msg_dispatch_fcn</h4>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
</div>
</div>
</div>
<p>
This parameter is the application-specific function used
to handle messages sent over Replication Manager message
channels. It takes four parameters:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
<code class="literal">channel</code>
</p>
<p>
Provides the DB_CHANNEL to be used to send
a response back to the originator of the message.
If the message was sent by the remote site using
<a class="xref" href="dbchannel_send_request.html" title="DB_CHANNEL-&gt;send_request()">DB_CHANNEL-&gt;send_request()</a>
then this function should send a response back to
the originator using the channel provided on this
parameter. The message should be sent by calling
<a class="xref" href="dbchannel_send_msg.html" title="DB_CHANNEL-&gt;send_msg()">DB_CHANNEL-&gt;send_msg()</a>
exactly once.
</p>
<p>
This channel is valid only during the current
invocation of the dispatch function; it is
destroyed when the dispatch function returns. The
application may not save a copy of the pointer and
use it later elsewhere. Methods that do not make
sense in the context of a message dispatch
function (such as
<a class="xref" href="dbchannel_send_request.html" title="DB_CHANNEL-&gt;send_request()">DB_CHANNEL-&gt;send_request()</a>
and
<a class="xref" href="dbchannel_close.html" title="DB_CHANNEL-&gt;close()">DB_CHANNEL-&gt;close()</a>)
will be rejected with <code class="literal">EINVAL</code>.
</p>
</li>
<li>
<p>
<code class="literal">request</code>
</p>
<p>
Array of DBTs containing the message
received from the remote site.
</p>
</li>
<li>
<p>
<code class="literal">nrequest</code>
</p>
<p>
Specifies the number of elements in the
<code class="literal">request</code> array.
</p>
</li>
<li>
<p>
<code class="literal">cb_flags</code>
</p>
<p>
This flag is
<code class="literal">DB_REPMGR_NEED_RESPONSE</code> if the
message requires a response. Otherwise, it is
<code class="literal">0</code>.
</p>
</li>
</ul>
</div>
<p>
This function does not return a value. If the function
encounters an error, you can reflect the error back to
the originator of the message by formatting an error
message of your own design into the response.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.2.36 on 9/14/2022
2011-12-20 00:07:10 +00:00
<h4 class="title"><a id="id3753245"></a>flags</h4>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
</div>
</div>
</div>
<p>
This parameter is currently unused, and must be
set to 0.
</p>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.2.36 on 9/14/2022
2011-12-20 00:07:10 +00:00
<h3 class="title"><a id="id3753152"></a>Errors</h3>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
</div>
</div>
</div>
<p>
The <code class="methodname">DB_ENV-&gt;repmgr_msg_dispatch()</code>
<span>
<span>
method may fail and return one of the following non-zero errors:
</span>
</span>
</p>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.2.36 on 9/14/2022
2011-12-20 00:07:10 +00:00
<h4 class="title"><a id="id3753316"></a>EINVAL</h4>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
</div>
</div>
</div>
<p>
If this method is called from a Base API application,
or if an invalid flag value or parameter was specified.
</p>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.2.36 on 9/14/2022
2011-12-20 00:07:10 +00:00
<h3 class="title"><a id="id3753309"></a>Class</h3>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
</div>
</div>
</div>
<p>
<a class="link" href="env.html" title="Chapter 5.  The DB_ENV Handle">DB_ENV</a>
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
Release 5.2.36 on 9/14/2022
2011-12-20 00:07:10 +00:00
<h3 class="title"><a id="id3753221"></a>See Also</h3>
Release 5.2.28 on 6/10/2011
2011-09-13 17:44:24 +00:00
</div>
</div>
</div>
<p>
<a class="xref" href="rep.html#replist" title="Replication and Related Methods">Replication and Related Methods</a>
</p>
</div>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="repmgrget_ack_policy.html">Prev</a> </td>
<td width="20%" align="center">
<a accesskey="u" href="rep.html">Up</a>
</td>
<td width="40%" align="right"> <a accesskey="n" href="repmgrset_ack_policy.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">DB_ENV-&gt;repmgr_get_ack_policy() </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> DB_ENV-&gt;repmgr_set_ack_policy()</td>
</tr>
</table>
</div>
</body>
</html>
Reference in a new issue Copy permalink