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EventHandler (Oracle - Berkeley DB Java API)
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<b>Berkeley DB</b><br><font size="-1"> version 4.7.25</font></EM>
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com.sleepycat.db</FONT>
<BR>
Interface EventHandler</H2>
<DL>
<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../com/sleepycat/db/EventHandlerAdapter.html" title="class in com.sleepycat.db">EventHandlerAdapter</A></DD>
</DL>
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<DL>
<DT><PRE>public interface <B>EventHandler</B></DL>
</PRE>
<P>
An interface classs with prototype definitions of all event functions that
can be called via the Berkeley DB event callback mechanism.
<p>
A user can choose to implement the EventHandler class, and implement handlers
for all of the event types. Alternatively it is possible to extend the
EventHandlerAdapter class, and implement only those events relevant to the
specific application.
<p>
The <A HREF="../../../com/sleepycat/db/EnvironmentConfig.html#setEventHandler(com.sleepycat.db.EventHandler)"><CODE>EnvironmentConfig.setEventHandler</CODE></A> is used to provide
a mechanism for reporting event messages from the Berkeley DB library
to the application.
<p>
Berkeley DB is not re-entrant. Callback functions should not attempt
to make library calls (for example, to release locks or close open
handles). Re-entering Berkeley DB is not guaranteed to work correctly,
and the results are undefined.
<P>
<P>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/EventHandler.html#handlePanicEvent()">handlePanicEvent</A></B>()</CODE>
<BR>
A callback function to be called when a panic event is sent from the Berkeley DB library.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/EventHandler.html#handleRepClientEvent()">handleRepClientEvent</A></B>()</CODE>
<BR>
A callback function to be called when a Replication Client event is sent
from the Berkeley DB library.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/EventHandler.html#handleRepElectedEvent()">handleRepElectedEvent</A></B>()</CODE>
<BR>
A callback function to be called when an event is sent from the
Berkeley DB library.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/EventHandler.html#handleRepMasterEvent()">handleRepMasterEvent</A></B>()</CODE>
<BR>
A callback function to be called when an event is sent from the
Berkeley DB library.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/EventHandler.html#handleRepNewMasterEvent(int)">handleRepNewMasterEvent</A></B>(int envId)</CODE>
<BR>
A callback function to be called when an event is sent from the
Berkeley DB library.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/EventHandler.html#handleRepPermFailedEvent()">handleRepPermFailedEvent</A></B>()</CODE>
<BR>
A callback function to be called when an event is sent from the
Berkeley DB library.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/EventHandler.html#handleRepStartupDoneEvent()">handleRepStartupDoneEvent</A></B>()</CODE>
<BR>
A callback function to be called when an event is sent from the
Berkeley DB library.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/db/EventHandler.html#handleWriteFailedEvent(int)">handleWriteFailedEvent</A></B>(int errorCode)</CODE>
<BR>
A callback function to be called when an event is sent from the
Berkeley DB library.</TD>
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<A NAME="handlePanicEvent()"><!-- --></A><H3>
handlePanicEvent</H3>
<PRE>
void <B>handlePanicEvent</B>()</PRE>
<DL>
<DD>A callback function to be called when a panic event is sent from the Berkeley DB library.
<p> This event callback is received when an error occurs in the Berkeley DB
library where the only solution is to shut down the application and run
recovery. In such cases, the Berkeley DB methods will throw
<A HREF="../../../com/sleepycat/db/RunRecoveryException.html" title="class in com.sleepycat.db"><CODE>RunRecoveryException</CODE></A> exceptions. It is often easier to simply exit
the application when such errors occur, rather than gracefully return up
the stack.
<p>
When this callback is received the database environment has failed. All
threads of control in the database environment should exit the environment
and recovery should be run.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="handleRepClientEvent()"><!-- --></A><H3>
handleRepClientEvent</H3>
<PRE>
void <B>handleRepClientEvent</B>()</PRE>
<DL>
<DD>A callback function to be called when a Replication Client event is sent
from the Berkeley DB library.
<p>
This event callback is received when this member of a replication group is
now a client site.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="handleRepElectedEvent()"><!-- --></A><H3>
handleRepElectedEvent</H3>
<PRE>
void <B>handleRepElectedEvent</B>()</PRE>
<DL>
<DD>A callback function to be called when an event is sent from the
Berkeley DB library.
<p>
This event callback is received when this site has just won an election. An
Application using the Base replication API should arrange for a call to
the <A HREF="../../../com/sleepycat/db/Environment.html#startReplication(com.sleepycat.db.DatabaseEntry, boolean)"><CODE>Environment.startReplication</CODE></A> method after receiving this
event to, reconfigure the local environment as a replication master.
<p>
Replication Manager applications may safely igore this event. The
Replication Manager calls <A HREF="../../../com/sleepycat/db/Environment.html#startReplication(com.sleepycat.db.DatabaseEntry, boolean)"><CODE>Environment.startReplication</CODE></A>
automatically on behalf of the application when appropriate (resulting in
firing of the <A HREF="../../../com/sleepycat/db/EventHandler.html#handleRepMasterEvent()"><CODE>EventHandler.handleRepMasterEvent</CODE></A> event).
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="handleRepMasterEvent()"><!-- --></A><H3>
handleRepMasterEvent</H3>
<PRE>
void <B>handleRepMasterEvent</B>()</PRE>
<DL>
<DD>A callback function to be called when an event is sent from the
Berkeley DB library.
<p>
This event callback is received when this site is now the master site of
its replication group. It is the application's responsibility to begin
acting as the master environment.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="handleRepNewMasterEvent(int)"><!-- --></A><H3>
handleRepNewMasterEvent</H3>
<PRE>
void <B>handleRepNewMasterEvent</B>(int envId)</PRE>
<DL>
<DD>A callback function to be called when an event is sent from the
Berkeley DB library.
<p>
This event callback is received when the replication group of which this
site is a member has just established a new master; the local site is not
the new master.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>envId</CODE> - The environment ID of the new master site.</DL>
</DD>
</DL>
<HR>
<A NAME="handleRepPermFailedEvent()"><!-- --></A><H3>
handleRepPermFailedEvent</H3>
<PRE>
void <B>handleRepPermFailedEvent</B>()</PRE>
<DL>
<DD>A callback function to be called when an event is sent from the
Berkeley DB library.
<p>
This event callback is received when the replication manager did not
receive enough acknowledgements (based on the acknowledgement policy
configured with <A HREF="../../../com/sleepycat/db/EnvironmentConfig.html#setReplicationManagerAckPolicy(com.sleepycat.db.ReplicationManagerAckPolicy)"><CODE>EnvironmentConfig.setReplicationManagerAckPolicy</CODE></A>)
to ensure a transaction's durability within the replication group. The
transaction will be flushed to the master's local disk storage for
durability.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="handleRepStartupDoneEvent()"><!-- --></A><H3>
handleRepStartupDoneEvent</H3>
<PRE>
void <B>handleRepStartupDoneEvent</B>()</PRE>
<DL>
<DD>A callback function to be called when an event is sent from the
Berkeley DB library.
<p>
This event callback is received when the client has completed startup
synchronization and is now processing live log records received from the
master.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="handleWriteFailedEvent(int)"><!-- --></A><H3>
handleWriteFailedEvent</H3>
<PRE>
void <B>handleWriteFailedEvent</B>(int errorCode)</PRE>
<DL>
<DD>A callback function to be called when an event is sent from the
Berkeley DB library.
<p>
This event callback is received when a Berkeley DB write to stable storage
failed.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>errorCode</CODE> - If an operating system specific error code is available for the failure it
will be passed in the errorCode parameter.</DL>
</DD>
</DL>
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