2011-09-13 17:44:24 +00:00
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<title>DbEnv::txn_applied()</title>
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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::txn_applied()</th>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="repmgrstat_print.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="txnset_commit_token.html">Next</a></td>
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<div>
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<h2 class="title" style="clear: both"><a id="envtxn_applied"></a>DbEnv::txn_applied()</h2>
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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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DB_ENV->txn_applied(DB_ENV *env, DB_TXN_TOKEN *token,
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db_timeout_t timeout, u_int32_t flags); </pre>
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<p>
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The <code class="methodname">DbEnv::txn_applied()</code> method checks to
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see if a specified transaction has been replicated from the master
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of a replication group. It may be called by applications using
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either the Base API or the Replication Manager.
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</p>
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<p>
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If the transaction has not yet arrived, this method will block for
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the amount of time specified on the <code class="literal">timeout</code>
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parameter while it waits for the result to be determined. For more
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information, please refer to the
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<a href="../../programmer_reference/rep_ryw.html" class="olink">Read your writes consistency</a>
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section in the <em class="citetitle">Berkeley DB Programmer's Reference Guide</em>.
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</p>
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<p>
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The <code class="methodname">DbEnv::txn_applied()</code> method may not be
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called before the <a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a>
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method.
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</p>
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<p>
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The <code class="methodname">DbEnv::txn_applied()</code> method returns a
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non-zero error on failure and 0 to indicate that the specified
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transaction has been applied at the local site. It may also return
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one of the following non-zero return codes:
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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">DB_TIMEOUT</code>
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</p>
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<p>
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Returned if the specified transaction has not yet arrived
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at the calling site, but can be expected to arrive soon.
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If a non-zero timeout parameter is given, the this method
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always waits for the specified amount of time before
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returning <code class="literal">DB_TIMEOUT</code>.
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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">DB_NOTFOUND</code>
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</p>
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<p>
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Returned if the transaction is expected to never arrive.
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This occurs if the transaction has not been applied at the
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local site because the transaction has been rolled back due
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to a master takeover.
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</p>
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</li>
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</ul>
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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="id3646727"></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="id3647112"></a>flags</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>flags</strong></span> parameter is
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currently unused, and must be set to 0.
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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="id3647273"></a>token</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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A pointer to a buffer containing a copy of a commit token
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previously generated at the replication group's master
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environment. Commit tokens are created using the
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<a class="xref" href="txnset_commit_token.html" title="DbTxn::set_commit_token()">DbTxn::set_commit_token()</a>
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method.
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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="id3647293"></a>timeout</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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Specifies the maximum time to wait for the transaction to
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arrive by replication, expressed in microseconds.
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To check the status of the transaction
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without waiting, provide a timeout value of 0.
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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="id3647257"></a>Errors</h3>
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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::txn_applied()</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="id3647371"></a>DB_KEYEMPTY</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 specified token was generated by a transaction that did
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not modify the database environment (for example, a read-only
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transaction).
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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="id3647217"></a><span>DbDeadlockException or </span> DB_LOCK_DEADLOCK</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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While waiting for the result to be determined, the API
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became locked out due to replication role change and/or
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master/client synchronization. The application should
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abort in-flight transactions, pause briefly, and then
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retry.
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</p>
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<p>
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<a class="xref" href="dbdeadlock.html" title="DbDeadlockException">DbDeadlockException</a> is thrown if
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your Berkeley DB API is configured to throw exceptions.
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Otherwise, <code class="literal">DB_LOCK_DEADLOCK</code> is returned.
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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="id3647373"></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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If the specified token was generated from a non-replicated
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database environment.
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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="id3647068"></a>Class</h3>
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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="id3647081"></a>See Also</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="xref" href="txn.html#txnlist" title="Transaction Subsystem and Related Methods">Transaction Subsystem and Related Methods</a>,
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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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<td width="40%" align="right"> <a accesskey="n" href="txnset_commit_token.html">Next</a></td>
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<tr>
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<td width="40%" align="left" valign="top">DbEnv::repmgr_stat_print() </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"> DbTxn::set_commit_token()</td>
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