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Recoverer (Bitronix Transaction Manager :: Core 2.1.4 API)
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bitronix.tm.recovery</FONT>
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Class Recoverer</H2>
<PRE>
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>bitronix.tm.recovery.Recoverer</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../bitronix/tm/recovery/RecovererMBean.html" title="interface in bitronix.tm.recovery">RecovererMBean</A>, <A HREF="../../../bitronix/tm/utils/Service.html" title="interface in bitronix.tm.utils">Service</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public class <B>Recoverer</B><DT>extends <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A><DT>implements <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</A>, <A HREF="../../../bitronix/tm/utils/Service.html" title="interface in bitronix.tm.utils">Service</A>, <A HREF="../../../bitronix/tm/recovery/RecovererMBean.html" title="interface in bitronix.tm.recovery">RecovererMBean</A></DL>
</PRE>
<P>
Recovery process implementation. Here is Mike Spille's description of XA recovery:
<p>
Straight Line Recovery:
<ul>
<li>1. Find transactions that the TM considers dangling and unresolved</li>
<li>2. Find and reconstitute any <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/javax/transaction/xa/XAResource.html?is-external=true" title="class or interface in javax.transaction.xa"><CODE>XAResource</CODE></A>s which were being used when chunk blowing occured.</li>
<li>3. Call the <code>recover()</code> method on each of these <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/javax/transaction/xa/XAResource.html?is-external=true" title="class or interface in javax.transaction.xa"><CODE>XAResource</CODE></A>s.</li>
<li>4. Throw out any <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/javax/transaction/xa/Xid.html?is-external=true" title="class or interface in javax.transaction.xa"><CODE>Xid</CODE></A>'s in the <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/javax/transaction/xa/XAResource.html?is-external=true" title="class or interface in javax.transaction.xa"><CODE>XAResource</CODE></A>' recover lists which are not owned by this TM.</li>
<li>5. Correlate <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/javax/transaction/xa/Xid.html?is-external=true" title="class or interface in javax.transaction.xa"><CODE>Xid</CODE></A>'s that the TM knows about with remaining <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/javax/transaction/xa/Xid.html?is-external=true" title="class or interface in javax.transaction.xa"><CODE>Xid</CODE></A>'s that the <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/javax/transaction/xa/XAResource.html?is-external=true" title="class or interface in javax.transaction.xa"><CODE>XAResource</CODE></A>s
reported.</li>
<li>6. For <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/javax/transaction/xa/XAResource.html?is-external=true" title="class or interface in javax.transaction.xa"><CODE>XAResource</CODE></A> <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/javax/transaction/xa/Xid.html?is-external=true" title="class or interface in javax.transaction.xa"><CODE>Xid</CODE></A>'s that match the global transaction ID which the TM found dangling with
a "Committing..." record, call <code>commit()</code> on those <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/javax/transaction/xa/XAResource.html?is-external=true" title="class or interface in javax.transaction.xa"><CODE>XAResource</CODE></A>s for those <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/javax/transaction/xa/Xid.html?is-external=true" title="class or interface in javax.transaction.xa"><CODE>Xid</CODE></A>s.</li>
<li>7. For <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/javax/transaction/xa/XAResource.html?is-external=true" title="class or interface in javax.transaction.xa"><CODE>XAResource</CODE></A> <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/javax/transaction/xa/Xid.html?is-external=true" title="class or interface in javax.transaction.xa"><CODE>Xid</CODE></A>'s that do not match any dangling "Committing..." records, call
<code>rollback()</code> on those <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/javax/transaction/xa/XAResource.html?is-external=true" title="class or interface in javax.transaction.xa"><CODE>XAResource</CODE></A>s for those <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/javax/transaction/xa/Xid.html?is-external=true" title="class or interface in javax.transaction.xa"><CODE>Xid</CODE></A>s.</li>
</ul>
Exceptional conditions:
<ul>
<li>1. For any <code>rollback()</code> calls from step 6 which reported a Heuristic Commit, you are in danger or
doubt, so run in circles, scream and shout.</li>
<li>2. For any <code>commit()</code> calls from step 7 which reported a Heuristic Rollback, you are in danger or
doubt, so run in circles, scream and shout.</li>
<li>3. For any resource you can't reconstitute in in step #2, or who fails on recover in step #3, or who reports
anything like an XAER_RMFAILURE in step 6 or step 7, keep trying to contact them in some implementation
defined manner.</li>
<li>4. For any heuristic outcome you see reported from an XAResource, call <code>forget()</code> for that
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/javax/transaction/xa/XAResource.html?is-external=true" title="class or interface in javax.transaction.xa"><CODE>XAResource</CODE></A>/<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/javax/transaction/xa/Xid.html?is-external=true" title="class or interface in javax.transaction.xa"><CODE>Xid</CODE></A> pair so that the resource can stop holding onto a reference to that transaction</li>
</ul>
</p>
<p>To achieve this, <A HREF="../../../bitronix/tm/recovery/Recoverer.html" title="class in bitronix.tm.recovery"><CODE>Recoverer</CODE></A> must have access to all previously used resources, even if the journal contains
no trace of some of them. There are two ways of achieving this: either you use the <A HREF="../../../bitronix/tm/resource/ResourceLoader.html" title="class in bitronix.tm.resource"><CODE>ResourceLoader</CODE></A> to configure
all your resources and everything will be working automatically or by making sure resources are re-created and re-registered.</p>
<p>Those are the three steps of the Bitronix implementation:
<ul>
<li>call <code>recover()</code> on all known resources (Mike's steps 1 to 5)</li>
<li>commit dangling COMMITTING transactions (Mike's step 6)</li>
<li>rollback any remaining recovered transaction (Mike's step 7)</li>
</ul></p>
<P>
<P>
<DL>
<DT><B>Author:</B></DT>
<DD>lorban</DD>
</DL>
<HR>
<P>
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<TD><CODE><B><A HREF="../../../bitronix/tm/recovery/Recoverer.html#Recoverer()">Recoverer</A></B>()</CODE>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../bitronix/tm/recovery/Recoverer.html#getCommittedCount()">getCommittedCount</A></B>()</CODE>
<BR>
Get the amount of transactions committed during the last recovery run.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../bitronix/tm/recovery/Recoverer.html#getCompletionException()">getCompletionException</A></B>()</CODE>
<BR>
Get the exception reported when recovery failed.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../bitronix/tm/recovery/Recoverer.html#getExecutionsCount()">getExecutionsCount</A></B>()</CODE>
<BR>
Get how many times the recoverer has run since the transaction manager started.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../bitronix/tm/recovery/Recoverer.html#getRolledbackCount()">getRolledbackCount</A></B>()</CODE>
<BR>
Get the amount of transactions rolled back during the last recovery run.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../bitronix/tm/recovery/Recoverer.html#isRunning()">isRunning</A></B>()</CODE>
<BR>
Check if the recoverer currently is running.</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="../../../bitronix/tm/recovery/Recoverer.html#run()">run</A></B>()</CODE>
<BR>
Run the recovery process.</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="../../../bitronix/tm/recovery/Recoverer.html#shutdown()">shutdown</A></B>()</CODE>
<BR>
Shutdown the service and free all held resources.</TD>
</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
</TR>
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<P>
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<B>Constructor Detail</B></FONT></TH>
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<A NAME="Recoverer()"><!-- --></A><H3>
Recoverer</H3>
<PRE>
public <B>Recoverer</B>()</PRE>
<DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
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<A NAME="shutdown()"><!-- --></A><H3>
shutdown</H3>
<PRE>
public void <B>shutdown</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../bitronix/tm/utils/Service.html#shutdown()">Service</A></CODE></B></DD>
<DD>Shutdown the service and free all held resources.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../bitronix/tm/utils/Service.html#shutdown()">shutdown</A></CODE> in interface <CODE><A HREF="../../../bitronix/tm/utils/Service.html" title="interface in bitronix.tm.utils">Service</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="run()"><!-- --></A><H3>
run</H3>
<PRE>
public void <B>run</B>()</PRE>
<DL>
<DD>Run the recovery process. This method is automatically called by the transaction manager, you should never
call it manually.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../bitronix/tm/recovery/RecovererMBean.html#run()">run</A></CODE> in interface <CODE><A HREF="../../../bitronix/tm/recovery/RecovererMBean.html" title="interface in bitronix.tm.recovery">RecovererMBean</A></CODE><DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Runnable.html?is-external=true#run()" title="class or interface in java.lang">run</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getCompletionException()"><!-- --></A><H3>
getCompletionException</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</A> <B>getCompletionException</B>()</PRE>
<DL>
<DD>Get the exception reported when recovery failed.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../bitronix/tm/recovery/RecovererMBean.html#getCompletionException()">getCompletionException</A></CODE> in interface <CODE><A HREF="../../../bitronix/tm/recovery/RecovererMBean.html" title="interface in bitronix.tm.recovery">RecovererMBean</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the exception that made recovery fail or null if last recovery execution was successful.</DL>
</DD>
</DL>
<HR>
<A NAME="getCommittedCount()"><!-- --></A><H3>
getCommittedCount</H3>
<PRE>
public int <B>getCommittedCount</B>()</PRE>
<DL>
<DD>Get the amount of transactions committed during the last recovery run.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../bitronix/tm/recovery/RecovererMBean.html#getCommittedCount()">getCommittedCount</A></CODE> in interface <CODE><A HREF="../../../bitronix/tm/recovery/RecovererMBean.html" title="interface in bitronix.tm.recovery">RecovererMBean</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the amount of committed transactions.</DL>
</DD>
</DL>
<HR>
<A NAME="getRolledbackCount()"><!-- --></A><H3>
getRolledbackCount</H3>
<PRE>
public int <B>getRolledbackCount</B>()</PRE>
<DL>
<DD>Get the amount of transactions rolled back during the last recovery run.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../bitronix/tm/recovery/RecovererMBean.html#getRolledbackCount()">getRolledbackCount</A></CODE> in interface <CODE><A HREF="../../../bitronix/tm/recovery/RecovererMBean.html" title="interface in bitronix.tm.recovery">RecovererMBean</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the amount of rolled back transactions.</DL>
</DD>
</DL>
<HR>
<A NAME="getExecutionsCount()"><!-- --></A><H3>
getExecutionsCount</H3>
<PRE>
public int <B>getExecutionsCount</B>()</PRE>
<DL>
<DD>Get how many times the recoverer has run since the transaction manager started.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../bitronix/tm/recovery/RecovererMBean.html#getExecutionsCount()">getExecutionsCount</A></CODE> in interface <CODE><A HREF="../../../bitronix/tm/recovery/RecovererMBean.html" title="interface in bitronix.tm.recovery">RecovererMBean</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>how many times the recoverer has run since the transaction manager started.</DL>
</DD>
</DL>
<HR>
<A NAME="isRunning()"><!-- --></A><H3>
isRunning</H3>
<PRE>
public boolean <B>isRunning</B>()</PRE>
<DL>
<DD>Check if the recoverer currently is running.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../bitronix/tm/recovery/RecovererMBean.html#isRunning()">isRunning</A></CODE> in interface <CODE><A HREF="../../../bitronix/tm/recovery/RecovererMBean.html" title="interface in bitronix.tm.recovery">RecovererMBean</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>true if the recoverer currently is running, false otherwise.</DL>
</DD>
</DL>
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