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TransactionLogRecord (Bitronix Transaction Manager :: Core 2.1.4 API)
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bitronix.tm.journal</FONT>
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Class TransactionLogRecord</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.journal.TransactionLogRecord</B>
</PRE>
<HR>
<DL>
<DT><PRE>public class <B>TransactionLogRecord</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></DL>
</PRE>
<P>
Representation of a transaction log record on disk.
<p>On-disk format has been implemented following Mike Spille's recommendations. Quoting him:</p>
<i><p><code>[RECORD_TYPE :4] [RECORD_LEN :4] [HEADER_LEN :4] [System.currentTimeMillis :8] [Sequence number :4]
[Checksum :4] [Payload :X] [END_RECORD_INDICATOR :4]</code></p>
<p>Where [RECORD_TYPE] is a passed-in record type from the TM. [RECORD_LEN] is the overall record length
(sans [RECORD_TYPE and [RECORD_LEN]). [HEADER_LEN] is the length of the remainder of the header - important if you
want to support easy upgrades of your format. The remaining pieces are the rest of the header, and the payload. The
header at least should have [System.currentTimeMillis] and [Sequence number], with the [sequence number] coming from
some monotically increasing sequence generator unique to the process. The [checksum] is optional for the paranoid
among us. The time information can be very useful for profiling and tracking down problems in production, and in
conjunction with the sequence number it can give you precise ordering. This doesn't give you much in this solution,
but can be priceless if you ever move to a system with multiple dual log file pairs to lessen single-threading on a
single log file pair. Finally, I like having an [END_RECORD_INDICATOR] as an extra corruption detector device - I'm
a suspenders and belt kind of guy. Actually, the END_RECORD_INDICATOR and [RECORD_LEN] in conjunction are very
useful in development, as well, to catch programming mistakes in the log system early.</p></i>
<p>Payload contains <code>[GTRID LENGTH :1] [GTRID :A] [UNIQUE NAMES COUNT :4] ([UNIQUE NAME LENGTH :2] [UNIQUE NAME :Y] ...)</code>
which makes a major difference with Mike's proposed format because here a record can vary in length: the GTRID size
is A bytes long (A being the GTRID length) and there can be X unique names that are Y characters long, Y being eventually
different for each name.</p>
<P>
<P>
<DL>
<DT><B>Author:</B></DT>
<DD>lorban</DD>
<DT><B>See Also:</B><DD><a href="http://jroller.com/page/pyrasun?entry=xa_exposed_part_iii_the">XA Exposed, Part III: The Implementor's Notebook</a></DL>
<HR>
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<TD><CODE><B><A HREF="../../../bitronix/tm/journal/TransactionLogRecord.html#TransactionLogRecord(int, int, int, long, int, int, bitronix.tm.utils.Uid, java.util.Set, int)">TransactionLogRecord</A></B>(int status,
int recordLength,
int headerLength,
long time,
int sequenceNumber,
int crc32,
<A HREF="../../../bitronix/tm/utils/Uid.html" title="class in bitronix.tm.utils">Uid</A> gtrid,
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A><<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>> uniqueNames,
int endRecord)</CODE>
<BR>
Use this constructor when restoring a log from the disk.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../bitronix/tm/journal/TransactionLogRecord.html#TransactionLogRecord(int, bitronix.tm.utils.Uid, java.util.Set)">TransactionLogRecord</A></B>(int status,
<A HREF="../../../bitronix/tm/utils/Uid.html" title="class in bitronix.tm.utils">Uid</A> gtrid,
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A><<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>> uniqueNames)</CODE>
<BR>
Create a new transaction log ready to be stored.</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../bitronix/tm/journal/TransactionLogRecord.html#calculateCrc32()">calculateCrc32</A></B>()</CODE>
<BR>
Calculate the CRC32 value of this record.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../bitronix/tm/journal/TransactionLogRecord.html#getCrc32()">getCrc32</A></B>()</CODE>
<BR>
</TD>
</TR>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../bitronix/tm/journal/TransactionLogRecord.html#getEndRecord()">getEndRecord</A></B>()</CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../bitronix/tm/utils/Uid.html" title="class in bitronix.tm.utils">Uid</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../bitronix/tm/journal/TransactionLogRecord.html#getGtrid()">getGtrid</A></B>()</CODE>
<BR>
</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/journal/TransactionLogRecord.html#getHeaderLength()">getHeaderLength</A></B>()</CODE>
<BR>
</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/journal/TransactionLogRecord.html#getRecordLength()">getRecordLength</A></B>()</CODE>
<BR>
</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/journal/TransactionLogRecord.html#getSequenceNumber()">getSequenceNumber</A></B>()</CODE>
<BR>
</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/journal/TransactionLogRecord.html#getStatus()">getStatus</A></B>()</CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> long</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../bitronix/tm/journal/TransactionLogRecord.html#getTime()">getTime</A></B>()</CODE>
<BR>
</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/util/Set.html?is-external=true" title="class or interface in java.util">Set</A><<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../bitronix/tm/journal/TransactionLogRecord.html#getUniqueNames()">getUniqueNames</A></B>()</CODE>
<BR>
</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/journal/TransactionLogRecord.html#isCrc32Correct()">isCrc32Correct</A></B>()</CODE>
<BR>
Recalculate the CRC32 value of this record (using <A HREF="../../../bitronix/tm/journal/TransactionLogRecord.html#calculateCrc32()"><CODE>calculateCrc32()</CODE></A>) and compare it with the stored value.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
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<CODE> <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../bitronix/tm/journal/TransactionLogRecord.html#toString()">toString</A></B>()</CODE>
<BR>
</TD>
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<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#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>
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<A NAME="TransactionLogRecord(int, int, int, long, int, int, bitronix.tm.utils.Uid, java.util.Set, int)"><!-- --></A><H3>
TransactionLogRecord</H3>
<PRE>
public <B>TransactionLogRecord</B>(int status,
int recordLength,
int headerLength,
long time,
int sequenceNumber,
int crc32,
<A HREF="../../../bitronix/tm/utils/Uid.html" title="class in bitronix.tm.utils">Uid</A> gtrid,
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A><<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>> uniqueNames,
int endRecord)</PRE>
<DL>
<DD>Use this constructor when restoring a log from the disk.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>status</CODE> - record type<DD><CODE>recordLength</CODE> - record length excluding status and recordLength<DD><CODE>headerLength</CODE> - length of all fields except gtrid, uniqueNames and endRecord<DD><CODE>time</CODE> - current time in milliseconds<DD><CODE>sequenceNumber</CODE> - atomically generated sequence number during a JVM's lifespan<DD><CODE>crc32</CODE> - checksum of the full record<DD><CODE>gtrid</CODE> - global transaction id<DD><CODE>uniqueNames</CODE> - unique names of XA data sources used in this transaction<DD><CODE>endRecord</CODE> - end of record marker</DL>
</DL>
<HR>
<A NAME="TransactionLogRecord(int, bitronix.tm.utils.Uid, java.util.Set)"><!-- --></A><H3>
TransactionLogRecord</H3>
<PRE>
public <B>TransactionLogRecord</B>(int status,
<A HREF="../../../bitronix/tm/utils/Uid.html" title="class in bitronix.tm.utils">Uid</A> gtrid,
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A><<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>> uniqueNames)</PRE>
<DL>
<DD>Create a new transaction log ready to be stored.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>status</CODE> - record type<DD><CODE>gtrid</CODE> - global transaction id<DD><CODE>uniqueNames</CODE> - unique names of XA data sources used in this transaction</DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
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<B>Method Detail</B></FONT></TH>
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</TABLE>
<A NAME="getStatus()"><!-- --></A><H3>
getStatus</H3>
<PRE>
public int <B>getStatus</B>()</PRE>
<DL>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getRecordLength()"><!-- --></A><H3>
getRecordLength</H3>
<PRE>
public int <B>getRecordLength</B>()</PRE>
<DL>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getHeaderLength()"><!-- --></A><H3>
getHeaderLength</H3>
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public int <B>getHeaderLength</B>()</PRE>
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getTime</H3>
<PRE>
public long <B>getTime</B>()</PRE>
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<DD><DL>
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<A NAME="getSequenceNumber()"><!-- --></A><H3>
getSequenceNumber</H3>
<PRE>
public int <B>getSequenceNumber</B>()</PRE>
<DL>
<DD><DL>
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</DD>
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<A NAME="getCrc32()"><!-- --></A><H3>
getCrc32</H3>
<PRE>
public int <B>getCrc32</B>()</PRE>
<DL>
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<A NAME="getGtrid()"><!-- --></A><H3>
getGtrid</H3>
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public <A HREF="../../../bitronix/tm/utils/Uid.html" title="class in bitronix.tm.utils">Uid</A> <B>getGtrid</B>()</PRE>
<DL>
<DD><DL>
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<A NAME="getUniqueNames()"><!-- --></A><H3>
getUniqueNames</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A><<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>> <B>getUniqueNames</B>()</PRE>
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getEndRecord</H3>
<PRE>
public int <B>getEndRecord</B>()</PRE>
<DL>
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<A NAME="isCrc32Correct()"><!-- --></A><H3>
isCrc32Correct</H3>
<PRE>
public boolean <B>isCrc32Correct</B>()</PRE>
<DL>
<DD>Recalculate the CRC32 value of this record (using <A HREF="../../../bitronix/tm/journal/TransactionLogRecord.html#calculateCrc32()"><CODE>calculateCrc32()</CODE></A>) and compare it with the stored value.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>true if the recalculated value equals the stored one, false otherwise.</DL>
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<A NAME="calculateCrc32()"><!-- --></A><H3>
calculateCrc32</H3>
<PRE>
public int <B>calculateCrc32</B>()</PRE>
<DL>
<DD>Calculate the CRC32 value of this record.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the CRC32 value of this record.</DL>
</DD>
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<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <B>toString</B>()</PRE>
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<DT><B>Overrides:</B><DD><CODE><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></CODE> in class <CODE><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></CODE></DL>
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