<!--$Id: newsite.so,v 1.2 2001/10/25 14:58:49 bostic Exp $--> <!--Copyright 1997-2003 by Sleepycat Software, Inc.--> <!--All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB Reference Guide: Connecting to a new site</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <table width="100%"><tr valign=top> <td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Berkeley DB Replication</dl></h3></td> <td align=right><a href="../rep/comm.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../rep/init.html"><img src="../../images/next.gif" alt="Next"></a> </td></tr></table> <p> <h3 align=center>Connecting to a new site</h3> <p>Connecting to a new site in the replication group happens whenever the <a href="../../api_c/rep_message.html">DB_ENV->rep_process_message</a> method returns <a href="../../api_c/rep_message.html#DB_REP_NEWSITE">DB_REP_NEWSITE</a>. The application should assign the new site a local environment ID number, and all future messages from the site passed to <a href="../../api_c/rep_message.html">DB_ENV->rep_process_message</a> should include that environment ID number. It is possible, of course, for the application to be aware of a new site before the return of <a href="../../api_c/rep_message.html">DB_ENV->rep_process_message</a> (for example, applications using connection-oriented protocols are likely to detect new sites immediately, while applications using broadcast protocols may not).</p> <p>Regardless, in applications supporting the dynamic addition of database environments to replication groups, environments joining an existing replication group may need to provide contact information. (For example, in an application using TCP/IP sockets, a DNS name or IP address might be a reasonable value to provide.) This can be done using the <b>cdata</b> parameter to the <a href="../../api_c/rep_start.html">DB_ENV->rep_start</a> method. The information referenced by <b>cdata</b> is wrapped in the initial contact message sent by the new environment, and is provided to the existing members of the group using the <b>rec</b> parameter returned by <a href="../../api_c/rep_message.html">DB_ENV->rep_process_message</a>. If no additional information was provided for Berkeley DB to forward to the existing members of the group, the <b>data</b> field of the <b>rec</b> parameter passed to the <a href="../../api_c/rep_message.html">DB_ENV->rep_process_message</a> method will be NULL after <a href="../../api_c/rep_message.html">DB_ENV->rep_process_message</a> returns <a href="../../api_c/rep_message.html#DB_REP_NEWSITE">DB_REP_NEWSITE</a>.</p> <table width="100%"><tr><td><br></td><td align=right><a href="../rep/comm.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../rep/init.html"><img src="../../images/next.gif" alt="Next"></a> </td></tr></table> <p><font size=1><a href="../../sleepycat/legal.html">Copyright (c) 1996-2003</a> <a href="http://www.sleepycat.com">Sleepycat Software, Inc.</a> - All rights reserved.</font> </body> </html>
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