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DbAppDispatch (Sleepycat Software, Inc. - Berkeley DB Java API)
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Interface DbAppDispatch</H2>
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<DT>public interface <B>DbAppDispatch</B></DL>

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An interface specifying a recovery function, which recovers application-specific actions.</p>
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<CODE>&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/DbAppDispatch.html#appDispatch(com.sleepycat.db.DbEnv, com.sleepycat.db.Dbt, com.sleepycat.db.DbLsn, int)">appDispatch</A></B>(<A HREF="../../../com/sleepycat/db/DbEnv.html">DbEnv</A>&nbsp;dbenv,
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            int&nbsp;op)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The DbAppDispatch interface is used by the DbEnv.setAppDispatch method.</TD>
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<A NAME="appDispatch(com.sleepycat.db.DbEnv, com.sleepycat.db.Dbt, com.sleepycat.db.DbLsn, int)"><!-- --></A><H3>
appDispatch</H3>
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public int <B>appDispatch</B>(<A HREF="../../../com/sleepycat/db/DbEnv.html">DbEnv</A>&nbsp;dbenv,
                       <A HREF="../../../com/sleepycat/db/Dbt.html">Dbt</A>&nbsp;log_rec,
                       <A HREF="../../../com/sleepycat/db/DbLsn.html">DbLsn</A>&nbsp;lsn,
                       int&nbsp;op)</PRE>
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<DD>The DbAppDispatch interface is used by the DbEnv.setAppDispatch method. This interface defines the application-specific function to be called during transaction abort and recovery.</p> The Db.DB_TXN_FORWARD_ROLL and Db.DB_TXN_APPLY operations frequently imply the same actions, redoing changes that appear in the log record, although if a recovery function is to be used on a replication client where reads may be taking place concurrently with the processing of incoming messages, Db.DB_TXN_APPLY operations should also perform appropriate locking.  The macro DB_REDO(op) checks that the operation is one of Db.DB_TXN_FORWARD_ROLL or Db.DB_TXN_APPLY, and should be used in the recovery code to refer to the conditions under which operations should be redone. Similarly, the macro DB_UNDO(op) checks if the operation is one of Db.DB_TXN_BACKWARD_ROLL or Db.DB_TXN_ABORT.</p> </p>
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<DT><B>Parameters:</B><DD><CODE>dbenv</CODE> - the enclosing database environment handle.<DD><CODE>log_rec</CODE> - a log record.<DD><CODE>lsn</CODE> - a log sequence number.<DD><CODE>op</CODE> - one of the following values:
<DT><B>Returns:</B><DD>The function must return 0 on success and either <b>errno</b> or a value outside of the Berkeley DB error name space on failure.</p></DL>
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