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DbAppDispatch
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com.sleepycat.db</FONT>
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Interface DbAppDispatch</H2>
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<DT><PRE>public interface <B>DbAppDispatch</B></DL>
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<P>
An interface specifying a recovery function, which recovers
application-specific actions.</p>
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<CODE> 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" title="class in com.sleepycat.db">DbEnv</A> dbenv,
<A HREF="../../../com/sleepycat/db/Dbt.html" title="class in com.sleepycat.db">Dbt</A> log_rec,
<A HREF="../../../com/sleepycat/db/DbLsn.html" title="class in com.sleepycat.db">DbLsn</A> lsn,
int op)</CODE>
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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>
<PRE>
int <B>appDispatch</B>(<A HREF="../../../com/sleepycat/db/DbEnv.html" title="class in com.sleepycat.db">DbEnv</A> dbenv,
<A HREF="../../../com/sleepycat/db/Dbt.html" title="class in com.sleepycat.db">Dbt</A> log_rec,
<A HREF="../../../com/sleepycat/db/DbLsn.html" title="class in com.sleepycat.db">DbLsn</A> lsn,
int op)</PRE>
<DL>
<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>
<P>
<DD><DL>
<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>
</DD>
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