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Xalan-Java 2.7.1: Interface ConnectionPool
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org.apache.xalan.lib.sql</FONT>
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Interface ConnectionPool</H2>
<DL>
<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../../org/apache/xalan/lib/sql/DefaultConnectionPool.html">DefaultConnectionPool</A>, <A HREF="../../../../../org/apache/xalan/lib/sql/JNDIConnectionPool.html">JNDIConnectionPool</A></DD>
</DL>
<HR>
<DL>
<DT>public interface <B>ConnectionPool</B></DL>
<P>
An interface used to build wrapper classes around existing
Connection Pool libraries.
Title: ConnectionPool<p>
<P>
<HR>
<P>
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<B>Method Summary</B></FONT></TD>
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<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/xalan/lib/sql/ConnectionPool.html#freeUnused()">freeUnused</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Start downsizeing the pool, this usally happens right after the
pool has been marked as Inactive and we are removing connections
that are not currently inuse.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;java.sql.Connection</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/xalan/lib/sql/ConnectionPool.html#getConnection()">getConnection</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Retrive a database connection from the pool</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/xalan/lib/sql/ConnectionPool.html#hasActiveConnections()">hasActiveConnections</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Provide an indicator to the PoolManager when the Pool can be removed
from the Pool Table.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/xalan/lib/sql/ConnectionPool.html#isEnabled()">isEnabled</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Determine if a Connection Pool has been disabled.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/xalan/lib/sql/ConnectionPool.html#releaseConnection(java.sql.Connection)">releaseConnection</A></B>(java.sql.Connection&nbsp;con)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return a connection to the pool, the connection may be closed if the
pool is inactive or has exceeded the max number of free connections</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/xalan/lib/sql/ConnectionPool.html#releaseConnectionOnError(java.sql.Connection)">releaseConnectionOnError</A></B>(java.sql.Connection&nbsp;con)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Provide a mechinism to return a connection to the pool on Error.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/xalan/lib/sql/ConnectionPool.html#setDriver(java.lang.String)">setDriver</A></B>(java.lang.String&nbsp;d)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Driver and URL are the only required parmeters.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/xalan/lib/sql/ConnectionPool.html#setMinConnections(int)">setMinConnections</A></B>(int&nbsp;n)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set tne minimum number of connections that are to be maintained in the
pool.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/xalan/lib/sql/ConnectionPool.html#setPassword(java.lang.String)">setPassword</A></B>(java.lang.String&nbsp;p)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The rest of the protocol parameters can eiter be passed in as
just Username and Password or as a property collection.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/xalan/lib/sql/ConnectionPool.html#setPoolEnabled(boolean)">setPoolEnabled</A></B>(boolean&nbsp;flag)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Pool can be Enabled and Disabled.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/xalan/lib/sql/ConnectionPool.html#setProtocol(java.util.Properties)">setProtocol</A></B>(java.util.Properties&nbsp;p)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Used to pass in extra configuration options during the
database connect phase.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/xalan/lib/sql/ConnectionPool.html#setURL(java.lang.String)">setURL</A></B>(java.lang.String&nbsp;url)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
</TR>
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<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/xalan/lib/sql/ConnectionPool.html#setUser(java.lang.String)">setUser</A></B>(java.lang.String&nbsp;u)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/xalan/lib/sql/ConnectionPool.html#testConnection()">testConnection</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Test to see if the connection info is valid to make a real connection
to the database.</TD>
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<P>
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<A NAME="isEnabled()"><!-- --></A><H3>
isEnabled</H3>
<PRE>
public boolean <B>isEnabled</B>()</PRE>
<DL>
<DD>Determine if a Connection Pool has been disabled. If a Connection pool
is disabled, then it will only manage connections that are in use.</DL>
<HR>
<A NAME="setDriver(java.lang.String)"><!-- --></A><H3>
setDriver</H3>
<PRE>
public void <B>setDriver</B>(java.lang.String&nbsp;d)</PRE>
<DL>
<DD>The Driver and URL are the only required parmeters.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>d</CODE> - &nbsp;</DL>
</DD>
</DL>
<HR>
<A NAME="setURL(java.lang.String)"><!-- --></A><H3>
setURL</H3>
<PRE>
public void <B>setURL</B>(java.lang.String&nbsp;url)</PRE>
<DL>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>url</CODE> - &nbsp;</DL>
</DD>
</DL>
<HR>
<A NAME="freeUnused()"><!-- --></A><H3>
freeUnused</H3>
<PRE>
public void <B>freeUnused</B>()</PRE>
<DL>
<DD>Start downsizeing the pool, this usally happens right after the
pool has been marked as Inactive and we are removing connections
that are not currently inuse.</DL>
<HR>
<A NAME="hasActiveConnections()"><!-- --></A><H3>
hasActiveConnections</H3>
<PRE>
public boolean <B>hasActiveConnections</B>()</PRE>
<DL>
<DD>Provide an indicator to the PoolManager when the Pool can be removed
from the Pool Table.</DL>
<HR>
<A NAME="setPassword(java.lang.String)"><!-- --></A><H3>
setPassword</H3>
<PRE>
public void <B>setPassword</B>(java.lang.String&nbsp;p)</PRE>
<DL>
<DD>The rest of the protocol parameters can eiter be passed in as
just Username and Password or as a property collection. If the
property collection is used, then the sperate username and password
may be ignored, it is up to the wrapper implementation to handle
the situation. If the connection information changes while after the
pool has been established, the wrapper implementation should ignore
the change and throw an error.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>p</CODE> - &nbsp;</DL>
</DD>
</DL>
<HR>
<A NAME="setUser(java.lang.String)"><!-- --></A><H3>
setUser</H3>
<PRE>
public void <B>setUser</B>(java.lang.String&nbsp;u)</PRE>
<DL>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>u</CODE> - &nbsp;</DL>
</DD>
</DL>
<HR>
<A NAME="setMinConnections(int)"><!-- --></A><H3>
setMinConnections</H3>
<PRE>
public void <B>setMinConnections</B>(int&nbsp;n)</PRE>
<DL>
<DD>Set tne minimum number of connections that are to be maintained in the
pool.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>n</CODE> - &nbsp;</DL>
</DD>
</DL>
<HR>
<A NAME="testConnection()"><!-- --></A><H3>
testConnection</H3>
<PRE>
public boolean <B>testConnection</B>()</PRE>
<DL>
<DD>Test to see if the connection info is valid to make a real connection
to the database. This method may cause the pool to be crated and filled
with min connections.</DL>
<HR>
<A NAME="getConnection()"><!-- --></A><H3>
getConnection</H3>
<PRE>
public java.sql.Connection <B>getConnection</B>()
throws java.sql.SQLException</PRE>
<DL>
<DD>Retrive a database connection from the pool<DD><DL>
<DT><B>Throws:</B><DD>java.sql.SQLException - &nbsp;</DL>
</DD>
</DL>
<HR>
<A NAME="releaseConnection(java.sql.Connection)"><!-- --></A><H3>
releaseConnection</H3>
<PRE>
public void <B>releaseConnection</B>(java.sql.Connection&nbsp;con)
throws java.sql.SQLException</PRE>
<DL>
<DD>Return a connection to the pool, the connection may be closed if the
pool is inactive or has exceeded the max number of free connections<DD><DL>
<DT><B>Parameters:</B><DD><CODE>con</CODE> - &nbsp;<DT><B>Throws:</B><DD>java.sql.SQLException - &nbsp;</DL>
</DD>
</DL>
<HR>
<A NAME="releaseConnectionOnError(java.sql.Connection)"><!-- --></A><H3>
releaseConnectionOnError</H3>
<PRE>
public void <B>releaseConnectionOnError</B>(java.sql.Connection&nbsp;con)
throws java.sql.SQLException</PRE>
<DL>
<DD>Provide a mechinism to return a connection to the pool on Error.
A good default behaviour is to close this connection and build
a new one to replace it. Some JDBC impl's won't allow you to
reuse a connection after an error occurs.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>con</CODE> - &nbsp;<DT><B>Throws:</B><DD>java.sql.SQLException - &nbsp;</DL>
</DD>
</DL>
<HR>
<A NAME="setPoolEnabled(boolean)"><!-- --></A><H3>
setPoolEnabled</H3>
<PRE>
public void <B>setPoolEnabled</B>(boolean&nbsp;flag)</PRE>
<DL>
<DD>The Pool can be Enabled and Disabled. Disabling the pool
closes all the outstanding Unused connections and any new
connections will be closed upon release.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>flag</CODE> - Control the Connection Pool. If it is enabled
then Connections will actuall be held around. If disabled
then all unused connections will be instantly closed and as
connections are released they are closed and removed from the pool.</DL>
</DD>
</DL>
<HR>
<A NAME="setProtocol(java.util.Properties)"><!-- --></A><H3>
setProtocol</H3>
<PRE>
public void <B>setProtocol</B>(java.util.Properties&nbsp;p)</PRE>
<DL>
<DD>Used to pass in extra configuration options during the
database connect phase.</DL>
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