2011-09-13 17:44:24 +00:00
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<title>DbEnv::rep_set_transport()</title>
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<link rel="up" href="rep.html" title="Chapter 11. Replication Methods" />
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<p>Library Version 11.2.5.2</p>
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<table width="100%" summary="Navigation header">
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<th colspan="3" align="center">DbEnv::rep_set_transport()</th>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="repset_timeout.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 11.
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Replication Methods
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="repstart.html">Next</a></td>
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="reptransport"></a>DbEnv::rep_set_transport()</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">#include <db_cxx.h>
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int
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DbEnv::rep_set_transport(int envid,
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int (*send)(DB_ENV *dbenv,
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const Dbt *control, const Dbt *rec, const DbLsn *lsnp,
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int envid, u_int32_t flags));</pre>
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<p>
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The <code class="methodname">DbEnv::rep_set_transport()</code> method initializes the communication
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infrastructure for a database environment participating in a replicated application.
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</p>
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<p>
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The <code class="methodname">DbEnv::rep_set_transport()</code> method is not called by most
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replication applications. It should only be called by Base API applications
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implementing their own network transport layer, explicitly holding
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replication group elections and handling replication messages outside
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of the Replication Manager framework.
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</p>
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<p>
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The <code class="methodname">DbEnv::rep_set_transport()</code> method configures operations
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performed using the specified <a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a> handle,
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not all operations performed on the underlying database environment.
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</p>
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<p>
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The <code class="methodname">DbEnv::rep_set_transport()</code> method may be called at any time
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during the life of the application.
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</p>
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<p>
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The <code class="methodname">DbEnv::rep_set_transport()</code> <span>
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<span>
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method either returns a non-zero error value or throws an
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exception that encapsulates a non-zero error value on
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failure, and returns 0 on success.
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</span>
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</span>
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</p>
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<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
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<h3 class="title">Note</h3>
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<p>
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Berkeley DB is not re-entrant. The callback function
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for this method should not attempt to make
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library calls (for example, to release locks or close open handles). Re-entering
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Berkeley DB is not guaranteed to work correctly, and the results are undefined.
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</p>
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</div>
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<div class="sect2" 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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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3641662"></a>Parameters</h3>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<div class="sect3" 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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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3641545"></a>envid</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>envid</strong></span> parameter is the local
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environment's ID. It must be a non-negative integer and uniquely identify
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this Berkeley DB database environment (see
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<a href="../../programmer_reference/rep_id.html" class="olink">Replication environment IDs</a>
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for more information).
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</p>
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</div>
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<div class="sect3" 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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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3641767"></a>send</h4>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>send</strong></span> callback function is used to
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transmit data using the replication application's communication
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infrastructure. The parameters to <span class="bold"><strong>send</strong></span> are as follows:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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<code class="literal">dbenv</code>
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</p>
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<p>
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The <span class="bold"><strong>dbenv</strong></span> parameter is the enclosing
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database environment handle.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">control</code>
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</p>
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<p>
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The <span class="bold"><strong>control</strong></span> parameter is the first of
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the two data elements to be transmitted by the <span class="bold"><strong>send</strong></span> function.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">rec</code>
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</p>
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<p>
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The <span class="bold"><strong>rec</strong></span> parameter is the second of
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the two data elements to be transmitted by the <span class="bold"><strong>send</strong></span> function.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">lsnp</code>
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</p>
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<p>
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If the type of message to be sent has an LSN associated with it, then
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the <span class="bold"><strong>lsnp</strong></span> parameter contains the LSN
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of the record being sent. This LSN can be used to determine that
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certain records have been processed successfully by clients.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">envid</code>
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</p>
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<p>
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The <span class="bold"><strong>envid</strong></span> parameter is a positive
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integer identifier that specifies the replication environment to which
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the message should be sent (see <a href="../../programmer_reference/rep_id.html" class="olink">Replication environment IDs</a> for more
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information).
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</p>
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<p><a id="transport_DB_EID_BROADCAST"></a>
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The special identifier <code class="literal">DB_EID_BROADCAST</code> indicates that a message
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should be broadcast to every environment in the replication group. The application
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may use a true broadcast protocol or may send the message in sequence to each
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machine with which it is in communication. In both cases, the sending site should
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not be asked to process the message.
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</p>
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<p>
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The special identifier
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<a href="../../programmer_reference/rep_id.html#rep_id.DB_EID_INVALID" class="olink">DB_EID_INVALID</a>
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indicates an invalid environment ID. This may be used to initialize
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values that are subsequently checked for validity.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">flags</code>
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</p>
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<p>
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The <span class="bold"><strong>flags</strong></span> parameter must be set to 0
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or by bitwise inclusively <span class="bold"><strong>OR</strong></span>'ing
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together one or more of the following values:
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</p>
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<div class="itemizedlist">
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<ul type="circle">
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<li>
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<p><a id="transport_DB_REP_ANYWHERE"></a>
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<code class="literal">DB_REP_ANYWHERE</code>
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</p>
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<p>
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The message is a client request that can be satisfied by another
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client as well as by the master.
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</p>
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</li>
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<li>
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<p><a id="transport_DB_REP_NOBUFFER"></a>
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<code class="literal">DB_REP_NOBUFFER</code>
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</p>
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<p>
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The record being sent should be transmitted immediately and not
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buffered or delayed.
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</p>
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</li>
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<li>
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<p><a id="transport_DB_REP_PERMANENT"></a>
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<code class="literal">DB_REP_PERMANENT</code>
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</p>
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<p>
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The record being sent is critical for maintaining database integrity
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(for example, the message includes a transaction commit). The
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application should take appropriate action to enforce the reliability
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guarantees it has chosen, such as waiting for acknowledgement from one
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or more clients.
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</p>
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</li>
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<li>
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<p><a id="transport_DB_REP_REREQUEST"></a>
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<code class="literal">DB_REP_REREQUEST</code>
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</p>
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<p>
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The message is a client request that has already been made and to
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which no response was received.
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</p>
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</li>
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</ul>
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</div>
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</li>
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</ul>
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</div>
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<p>
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It may sometimes be useful to pass application-specific data to the send
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function; see <a href="../../programmer_reference/env_faq.html" class="olink">Environment FAQ</a>
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for a discussion on how to do this.
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</p>
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<p>
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The <span class="bold"><strong>send</strong></span> function must return 0 on success and non-zero on failure.
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If the send function fails, the message being sent is necessary to maintain database integrity, and
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the local log is not configured for synchronous flushing, the local log will be flushed; otherwise,
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any error from the <span class="bold"><strong>send</strong></span> function will be ignored.
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</p>
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</div>
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</div>
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<div class="sect2" 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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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3642088"></a>Errors</h3>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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The <code class="methodname">DbEnv::rep_set_transport()</code> <span>
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<span>
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method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
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exception, encapsulating one of the following non-zero errors, or return one
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of the following non-zero errors:
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</span>
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</span>
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</p>
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<div class="sect3" 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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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3642336"></a>EINVAL</h4>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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The method is called from a Replication Manager application; or an invalid flag value or
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parameter was specified.
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</p>
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</div>
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</div>
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<div class="sect2" 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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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3642421"></a>Class</h3>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>
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</p>
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</div>
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<div class="sect2" 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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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3642356"></a>See Also</h3>
|
2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="rep.html#replist" title="Replication and Related Methods">Replication and Related Methods</a>
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</p>
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</div>
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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="repset_timeout.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="repstart.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">DbEnv::rep_set_timeout() </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"> DbEnv::rep_start()</td>
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</tr>
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</table>
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</body>
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</html>
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