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TransactionRunner (Sleepycat Software, Inc. - Berkeley DB Java API)
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com.sleepycat.collections</FONT>
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Class TransactionRunner</H2>
<PRE>
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../resources/inherit.gif" ALT="extended by"><B>com.sleepycat.collections.TransactionRunner</B>
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<DL>
<DT>public class <B>TransactionRunner</B><DT>extends <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></DL>
<P>
Starts a transaction, calls <A HREF="../../../com/sleepycat/collections/TransactionWorker.html#doWork()"><CODE>TransactionWorker.doWork()</CODE></A>, and handles
transaction retry and exceptions.
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/TransactionRunner.html#DEFAULT_MAX_RETRIES">DEFAULT_MAX_RETRIES</A></B></CODE>
<BR>
The default maximum number of retries.</TD>
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<TD><CODE><B><A HREF="../../../com/sleepycat/collections/TransactionRunner.html#TransactionRunner(com.sleepycat.db.Environment)">TransactionRunner</A></B>(<A HREF="../../../com/sleepycat/db/Environment.html" title="class in com.sleepycat.db">Environment</A> env)</CODE>
<BR>
Creates a transaction runner for a given Berkeley DB environment.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/TransactionRunner.html#TransactionRunner(com.sleepycat.db.Environment, int, com.sleepycat.db.TransactionConfig)">TransactionRunner</A></B>(<A HREF="../../../com/sleepycat/db/Environment.html" title="class in com.sleepycat.db">Environment</A> env,
int maxRetries,
<A HREF="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</A> config)</CODE>
<BR>
Creates a transaction runner for a given Berkeley DB environment and
with a given number of maximum retries.</TD>
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<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/TransactionRunner.html#getAllowNestedTransactions()">getAllowNestedTransactions</A></B>()</CODE>
<BR>
Returns whether nested transactions will be created if
<code>run()</code> is called when a transaction is already active for
the current thread.</TD>
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<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="../../../com/sleepycat/collections/TransactionRunner.html#getMaxRetries()">getMaxRetries</A></B>()</CODE>
<BR>
Returns the maximum number of retries that will be performed when
deadlocks are detected.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/TransactionRunner.html#getTransactionConfig()">getTransactionConfig</A></B>()</CODE>
<BR>
Returns the transaction configuration used for calling
<A HREF="../../../com/sleepycat/db/Environment.html#beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)"><CODE>Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)</CODE></A>.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/TransactionRunner.html#run(com.sleepycat.collections.TransactionWorker)">run</A></B>(<A HREF="../../../com/sleepycat/collections/TransactionWorker.html" title="interface in com.sleepycat.collections">TransactionWorker</A> worker)</CODE>
<BR>
Calls the <A HREF="../../../com/sleepycat/collections/TransactionWorker.html#doWork()"><CODE>TransactionWorker.doWork()</CODE></A> method and, for transactional
environments, begins and ends a transaction.</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/collections/TransactionRunner.html#setAllowNestedTransactions(boolean)">setAllowNestedTransactions</A></B>(boolean allowNestedTxn)</CODE>
<BR>
Changes whether nested transactions will be created if
<code>run()</code> is called when a transaction is already active for
the current thread.</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/collections/TransactionRunner.html#setMaxRetries(int)">setMaxRetries</A></B>(int maxRetries)</CODE>
<BR>
Changes the maximum number of retries that will be performed when
deadlocks are detected.</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/collections/TransactionRunner.html#setTransactionConfig(com.sleepycat.db.TransactionConfig)">setTransactionConfig</A></B>(<A HREF="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</A> config)</CODE>
<BR>
Changes the transaction configuration used for calling
<A HREF="../../../com/sleepycat/db/Environment.html#beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)"><CODE>Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)</CODE></A>.</TD>
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<P>
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<A NAME="DEFAULT_MAX_RETRIES"><!-- --></A><H3>
DEFAULT_MAX_RETRIES</H3>
<PRE>
public static final int <B>DEFAULT_MAX_RETRIES</B></PRE>
<DL>
<DD>The default maximum number of retries.
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../constant-values.html#com.sleepycat.collections.TransactionRunner.DEFAULT_MAX_RETRIES">Constant Field Values</A></DL>
</DL>
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<A NAME="TransactionRunner(com.sleepycat.db.Environment)"><!-- --></A><H3>
TransactionRunner</H3>
<PRE>
public <B>TransactionRunner</B>(<A HREF="../../../com/sleepycat/db/Environment.html" title="class in com.sleepycat.db">Environment</A> env)</PRE>
<DL>
<DD>Creates a transaction runner for a given Berkeley DB environment.
The default maximum number of retries (<A HREF="../../../com/sleepycat/collections/TransactionRunner.html#DEFAULT_MAX_RETRIES"><CODE>DEFAULT_MAX_RETRIES</CODE></A>) and
a null (default) <A HREF="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db"><CODE>TransactionConfig</CODE></A> will be used.
<P>
<DT><B>Parameters:</B><DD><CODE>env</CODE> - is the environment for running transactions.</DL>
<HR>
<A NAME="TransactionRunner(com.sleepycat.db.Environment, int, com.sleepycat.db.TransactionConfig)"><!-- --></A><H3>
TransactionRunner</H3>
<PRE>
public <B>TransactionRunner</B>(<A HREF="../../../com/sleepycat/db/Environment.html" title="class in com.sleepycat.db">Environment</A> env,
int maxRetries,
<A HREF="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</A> config)</PRE>
<DL>
<DD>Creates a transaction runner for a given Berkeley DB environment and
with a given number of maximum retries.
<P>
<DT><B>Parameters:</B><DD><CODE>env</CODE> - is the environment for running transactions.<DD><CODE>maxRetries</CODE> - is the maximum number of retries that will be
performed when deadlocks are detected.<DD><CODE>config</CODE> - the transaction configuration used for calling
<A HREF="../../../com/sleepycat/db/Environment.html#beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)"><CODE>Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)</CODE></A>, or null to use the default
configuration. The configuration object is not cloned, and
any modifications to it will impact subsequent transactions.</DL>
<!-- ============ METHOD DETAIL ========== -->
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<B>Method Detail</B></FONT></TD>
</TR>
</TABLE>
<A NAME="getMaxRetries()"><!-- --></A><H3>
getMaxRetries</H3>
<PRE>
public int <B>getMaxRetries</B>()</PRE>
<DL>
<DD>Returns the maximum number of retries that will be performed when
deadlocks are detected.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="setMaxRetries(int)"><!-- --></A><H3>
setMaxRetries</H3>
<PRE>
public void <B>setMaxRetries</B>(int maxRetries)</PRE>
<DL>
<DD>Changes the maximum number of retries that will be performed when
deadlocks are detected.
Calling this method does not impact transactions already running.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getAllowNestedTransactions()"><!-- --></A><H3>
getAllowNestedTransactions</H3>
<PRE>
public boolean <B>getAllowNestedTransactions</B>()</PRE>
<DL>
<DD>Returns whether nested transactions will be created if
<code>run()</code> is called when a transaction is already active for
the current thread.
By default this property is false.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="setAllowNestedTransactions(boolean)"><!-- --></A><H3>
setAllowNestedTransactions</H3>
<PRE>
public void <B>setAllowNestedTransactions</B>(boolean allowNestedTxn)</PRE>
<DL>
<DD>Changes whether nested transactions will be created if
<code>run()</code> is called when a transaction is already active for
the current thread.
Calling this method does not impact transactions already running.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getTransactionConfig()"><!-- --></A><H3>
getTransactionConfig</H3>
<PRE>
public <A HREF="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</A> <B>getTransactionConfig</B>()</PRE>
<DL>
<DD>Returns the transaction configuration used for calling
<A HREF="../../../com/sleepycat/db/Environment.html#beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)"><CODE>Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)</CODE></A>.
<p>If this property is null, the default configuration is used. The
configuration object is not cloned, and any modifications to it will
impact subsequent transactions.</p>
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the transaction configuration.</DL>
</DD>
</DL>
<HR>
<A NAME="setTransactionConfig(com.sleepycat.db.TransactionConfig)"><!-- --></A><H3>
setTransactionConfig</H3>
<PRE>
public void <B>setTransactionConfig</B>(<A HREF="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</A> config)</PRE>
<DL>
<DD>Changes the transaction configuration used for calling
<A HREF="../../../com/sleepycat/db/Environment.html#beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)"><CODE>Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig)</CODE></A>.
<p>If this property is null, the default configuration is used. The
configuration object is not cloned, and any modifications to it will
impact subsequent transactions.</p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>config</CODE> - the transaction configuration.</DL>
</DD>
</DL>
<HR>
<A NAME="run(com.sleepycat.collections.TransactionWorker)"><!-- --></A><H3>
run</H3>
<PRE>
public void <B>run</B>(<A HREF="../../../com/sleepycat/collections/TransactionWorker.html" title="interface in com.sleepycat.collections">TransactionWorker</A> worker)
throws <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A>,
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Exception.html" title="class or interface in java.lang">Exception</A></PRE>
<DL>
<DD>Calls the <A HREF="../../../com/sleepycat/collections/TransactionWorker.html#doWork()"><CODE>TransactionWorker.doWork()</CODE></A> method and, for transactional
environments, begins and ends a transaction. If the environment given
is non-transactional, a transaction will not be used but the doWork()
method will still be called.
<p> In a transactional environment, a new transaction is started before
calling doWork(). This will start a nested transaction if one is
already active. If DeadlockException is thrown by doWork(), the
transaction will be aborted and the process will be repeated up to the
maximum number of retries specified. If another exception is thrown by
doWork() or the maximum number of retries has occurred, the transaction
will be aborted and the exception will be rethrown by this method. If
no exception is thrown by doWork(), the transaction will be committed.
This method will not attempt to commit or abort a transaction if it has
already been committed or aborted by doWork(). </p>
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../com/sleepycat/db/DeadlockException.html" title="class in com.sleepycat.db">DeadlockException</A></CODE> - when it is thrown by doWork() and the
maximum number of retries has occurred. The transaction will have been
aborted by this method.
<DD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Exception.html" title="class or interface in java.lang">Exception</A></CODE> - when any other exception is thrown by doWork(). The
exception will first be unwrapped by calling <A HREF="../../../com/sleepycat/util/ExceptionUnwrapper.html#unwrap(java.lang.Exception)"><CODE>ExceptionUnwrapper.unwrap(java.lang.Exception)</CODE></A>. The transaction will have been aborted by
this method.
<DD><CODE><A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE></DL>
</DD>
</DL>
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