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CurrentTransaction (Sleepycat Software, Inc. - Berkeley DB Java API)
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com.sleepycat.collections</FONT>
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Class CurrentTransaction</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.CurrentTransaction</B>
</PRE>
<HR>
<DL>
<DT>public class <B>CurrentTransaction</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>
Provides access to the current transaction for the current thread within the
context of a Berkeley DB environment. This class provides explicit
transaction control beyond that provided by the <A HREF="../../../com/sleepycat/collections/TransactionRunner.html" title="class in com.sleepycat.collections"><CODE>TransactionRunner</CODE></A>
class. However, both methods of transaction control manage per-thread
transactions.
<P>
<P>
<HR>
<P>
<!-- ======== NESTED CLASS SUMMARY ======== -->
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<B>Method Summary</B></FONT></TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/CurrentTransaction.html#abortTransaction()">abortTransaction</A></B>()</CODE>
<BR>
Aborts the transaction that is active for the current thread for this
environment and makes the parent transaction (if any) the current
transaction.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/CurrentTransaction.html#beginTransaction(com.sleepycat.db.TransactionConfig)">beginTransaction</A></B>(<A HREF="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</A> config)</CODE>
<BR>
Begins a new transaction for this environment and associates it with
the current thread.</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/Transaction.html" title="class in com.sleepycat.db">Transaction</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/CurrentTransaction.html#commitTransaction()">commitTransaction</A></B>()</CODE>
<BR>
Commits the transaction that is active for the current thread for this
environment and makes the parent transaction (if any) the current
transaction.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../com/sleepycat/db/Environment.html" title="class in com.sleepycat.db">Environment</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/CurrentTransaction.html#getEnvironment()">getEnvironment</A></B>()</CODE>
<BR>
Returns the underlying Berkeley DB environment.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../com/sleepycat/collections/CurrentTransaction.html" title="class in com.sleepycat.collections">CurrentTransaction</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/CurrentTransaction.html#getInstance(com.sleepycat.db.Environment)">getInstance</A></B>(<A HREF="../../../com/sleepycat/db/Environment.html" title="class in com.sleepycat.db">Environment</A> env)</CODE>
<BR>
Gets the CurrentTransaction accessor for a specified Berkeley DB
environment.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/CurrentTransaction.html#getTransaction()">getTransaction</A></B>()</CODE>
<BR>
Returns the transaction associated with the current thread for this
environment, or null if no transaction is active.</TD>
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<TD><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></B></TD>
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<A NAME="getInstance(com.sleepycat.db.Environment)"><!-- --></A><H3>
getInstance</H3>
<PRE>
public static <A HREF="../../../com/sleepycat/collections/CurrentTransaction.html" title="class in com.sleepycat.collections">CurrentTransaction</A> <B>getInstance</B>(<A HREF="../../../com/sleepycat/db/Environment.html" title="class in com.sleepycat.db">Environment</A> env)</PRE>
<DL>
<DD>Gets the CurrentTransaction accessor for a specified Berkeley DB
environment. This method always returns the same reference when called
more than once with the same environment parameter.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>env</CODE> - is an open Berkeley DB environment.
<DT><B>Returns:</B><DD>the CurrentTransaction accessor for the given environment, or
null if the environment is not transactional.</DL>
</DD>
</DL>
<HR>
<A NAME="getEnvironment()"><!-- --></A><H3>
getEnvironment</H3>
<PRE>
public final <A HREF="../../../com/sleepycat/db/Environment.html" title="class in com.sleepycat.db">Environment</A> <B>getEnvironment</B>()</PRE>
<DL>
<DD>Returns the underlying Berkeley DB environment.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getTransaction()"><!-- --></A><H3>
getTransaction</H3>
<PRE>
public final <A HREF="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</A> <B>getTransaction</B>()</PRE>
<DL>
<DD>Returns the transaction associated with the current thread for this
environment, or null if no transaction is active.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="beginTransaction(com.sleepycat.db.TransactionConfig)"><!-- --></A><H3>
beginTransaction</H3>
<PRE>
public final <A HREF="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</A> <B>beginTransaction</B>(<A HREF="../../../com/sleepycat/db/TransactionConfig.html" title="class in com.sleepycat.db">TransactionConfig</A> config)
throws <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></PRE>
<DL>
<DD>Begins a new transaction for this environment and associates it with
the current thread. If a transaction is already active for this
environment and thread, a nested transaction will be created.
<P>
<DD><DL>
<DT><B>Parameters:</B><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.
<DT><B>Returns:</B><DD>the new transaction.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE> - if the transaction cannot be started, in which
case any existing transaction is not affected.
<DD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/IllegalStateException.html" title="class or interface in java.lang">IllegalStateException</A></CODE> - if a transaction is already active and
nested transactions are not supported by the environment.</DL>
</DD>
</DL>
<HR>
<A NAME="commitTransaction()"><!-- --></A><H3>
commitTransaction</H3>
<PRE>
public final <A HREF="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</A> <B>commitTransaction</B>()
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/IllegalStateException.html" title="class or interface in java.lang">IllegalStateException</A></PRE>
<DL>
<DD>Commits the transaction that is active for the current thread for this
environment and makes the parent transaction (if any) the current
transaction.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the parent transaction or null if the committed transaction was
not nested.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE> - if an error occurs committing the transaction.
The transaction will still be closed and the parent transaction will
become the current transaction.
<DD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/IllegalStateException.html" title="class or interface in java.lang">IllegalStateException</A></CODE> - if no transaction is active for the
current thread for this environment.</DL>
</DD>
</DL>
<HR>
<A NAME="abortTransaction()"><!-- --></A><H3>
abortTransaction</H3>
<PRE>
public final <A HREF="../../../com/sleepycat/db/Transaction.html" title="class in com.sleepycat.db">Transaction</A> <B>abortTransaction</B>()
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/IllegalStateException.html" title="class or interface in java.lang">IllegalStateException</A></PRE>
<DL>
<DD>Aborts the transaction that is active for the current thread for this
environment and makes the parent transaction (if any) the current
transaction.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the parent transaction or null if the aborted transaction was
not nested.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db">DatabaseException</A></CODE> - if an error occurs aborting the transaction.
The transaction will still be closed and the parent transaction will
become the current transaction.
<DD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/IllegalStateException.html" title="class or interface in java.lang">IllegalStateException</A></CODE> - if no transaction is active for the
current thread for this environment.</DL>
</DD>
</DL>
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