erik/SimplePool
erik/SimplePool
1
0
Fork 0
Code Issues Pull requests Releases Activity

Initial commit for Git.

Browse source
This commit is contained in:
Erik C. Thauvin 2012-05-14 13:37:38 -07:00
parent 98b1521e20
commit 9595f70fd7
27 changed files with 1790 additions and 1780 deletions
Download patch file Download diff file Expand all files Collapse all files

282
src/net/java/dev/simplepool/SimplePoolServlet.java
View file

@ -1,141 +1,141 @@
/*
* $Source$
* $Revision$
* $Date$
*
* Copyright (c) 2004, Russell Beattie (http://www.russellbeattie.com/)
* All rights reserved.
*
* Copyright (c) 2004, Erik C. Thauvin (http://www.thauvin.net/erik/)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the authors nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package net.java.dev.simplepool;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
/**
* Creates a pool of database connection based on the specific intialization parameters.
*
* @author <a href="http://www.russellbeattie.com/">Russell Beattie</a>
* @author <a href="http://www.thauvin.net/erik/">Erik C. Thauvin</a>
* @version $Revision$, $Date$
* @since 1.0
*/
public class SimplePoolServlet extends HttpServlet {
private static final Log log = LogFactory.getLog(SimplePoolServlet.class);
private static SimplePoolDataSource dataSource;
/**
* Closes the connection pool.
*
* @see javax.servlet.http.HttpServlet#destroy
*/
public void destroy() {
if (dataSource != null) {
dataSource.close();
}
}
/**
* Initializes the connection pool.
* <p/>
* The required intialization parameters are:
* <p/>
* <ul>
* <li><code>varName</code> &ndash; Name of the variable used to hold a reference to the
* {@link SimplePoolDataSource}.</li>
* <li><code>driver</code> &ndash; JDBC driver. e.g. 'oracle.jdbc.driver.OracleDriver'</li>
* <li><code>jdbcUrl</code> &ndash; JDBC connect string. e.g. 'jdbc:oracle:thin:@203.92.21.109:1526:orcl'</li>
* <li><code>user</code> &ndash; Database login name. e.g. 'Scott'</li>
* <li><code>password</code> &ndash; Database password. e.g. 'Tiger'</li>
* <li><code>minConns</code> &ndash; Minimum number of connections to start with.</li>
* <li><code>maxConns</code> &ndash; Maximum number of connections in dynamic pool.</li>
* <li><code>maxConnTime</code> &ndash; Time in days between connection resets.</li>
* <li><code>maxCheckoutSeconds</code> &ndash; Max time a connection can be checked out before being recycled.</li>
* </ul>
*
* @see javax.servlet.http.HttpServlet#init(ServletConfig)
*/
public void init(ServletConfig servletConfig)
throws ServletException {
log.info("Initializing " + servletConfig.getServletName() + " Servlet");
String varName = servletConfig.getInitParameter("varName");
String driver = servletConfig.getInitParameter("driver");
String jdbcUrl = servletConfig.getInitParameter("jdbcUrl");
String user = servletConfig.getInitParameter("user");
String password = servletConfig.getInitParameter("password");
String minConns = servletConfig.getInitParameter("minConns");
String maxConns = servletConfig.getInitParameter("maxConns");
String maxConnTime = servletConfig.getInitParameter("maxConnTime");
String maxCheckoutSeconds = servletConfig.getInitParameter("maxCheckoutSeconds");
if (isValid(varName) && isValid(driver) && isValid(jdbcUrl) && (user != null) && (password != null)
&& isValid(minConns) && isValid(maxConns) && isValid(maxConnTime) && isValid(maxCheckoutSeconds)) {
dataSource = new SimplePoolDataSource();
dataSource.setDriver(driver);
dataSource.setJdbcUrl(jdbcUrl);
dataSource.setUser(user);
dataSource.setPassword(password);
dataSource.setMinConns(minConns);
dataSource.setMaxConns(maxConns);
dataSource.setMaxConnTime(maxConnTime);
dataSource.setMaxCheckoutSeconds(maxCheckoutSeconds);
try {
dataSource.init();
servletConfig.getServletContext().setAttribute(varName, dataSource);
} catch (Exception e) {
log.error("An error occurred while starting the connection pool.", e);
throw new ServletException("Error starting the connection pool.");
}
} else {
log.error("One or more intialization parameter is invalid or missing.");
throw new ServletException("Invalid or missing initialization parameter.");
}
}
private boolean isValid(String s) {
if ((s != null) && (s.length() > 0)) {
return true;
}
return false;
}
}
/*
* $Source: /home/cvsroot/manywhere/simplepool/src/net/java/dev/simplepool/SimplePoolServlet.java,v $
* $Revision: 1.5 $
* $Date: 2004/03/17 23:35:36 $
*
* Copyright (c) 2004, Russell Beattie (http://www.russellbeattie.com/)
* All rights reserved.
*
* Copyright (c) 2004, Erik C. Thauvin (http://www.thauvin.net/erik/)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the authors nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package net.java.dev.simplepool;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
/**
* Creates a pool of database connection based on the specific intialization parameters.
*
* @author <a href="http://www.russellbeattie.com/">Russell Beattie</a>
* @author <a href="http://www.thauvin.net/erik/">Erik C. Thauvin</a>
* @version $Revision: 1.5 $, $Date: 2004/03/17 23:35:36 $
* @since 1.0
*/
public class SimplePoolServlet extends HttpServlet {
private static final Log log = LogFactory.getLog(SimplePoolServlet.class);
private static SimplePoolDataSource dataSource;
/**
* Closes the connection pool.
*
* @see javax.servlet.http.HttpServlet#destroy
*/
public void destroy() {
if (dataSource != null) {
dataSource.close();
}
}
/**
* Initializes the connection pool.
* <p/>
* The required intialization parameters are:
* <p/>
* <ul>
* <li><code>varName</code> &ndash; Name of the variable used to hold a reference to the
* {@link SimplePoolDataSource}.</li>
* <li><code>driver</code> &ndash; JDBC driver. e.g. 'oracle.jdbc.driver.OracleDriver'</li>
* <li><code>jdbcUrl</code> &ndash; JDBC connect string. e.g. 'jdbc:oracle:thin:@203.92.21.109:1526:orcl'</li>
* <li><code>user</code> &ndash; Database login name. e.g. 'Scott'</li>
* <li><code>password</code> &ndash; Database password. e.g. 'Tiger'</li>
* <li><code>minConns</code> &ndash; Minimum number of connections to start with.</li>
* <li><code>maxConns</code> &ndash; Maximum number of connections in dynamic pool.</li>
* <li><code>maxConnTime</code> &ndash; Time in days between connection resets.</li>
* <li><code>maxCheckoutSeconds</code> &ndash; Max time a connection can be checked out before being recycled.</li>
* </ul>
*
* @see javax.servlet.http.HttpServlet#init(ServletConfig)
*/
public void init(ServletConfig servletConfig)
throws ServletException {
log.info("Initializing " + servletConfig.getServletName() + " Servlet");
String varName = servletConfig.getInitParameter("varName");
String driver = servletConfig.getInitParameter("driver");
String jdbcUrl = servletConfig.getInitParameter("jdbcUrl");
String user = servletConfig.getInitParameter("user");
String password = servletConfig.getInitParameter("password");
String minConns = servletConfig.getInitParameter("minConns");
String maxConns = servletConfig.getInitParameter("maxConns");
String maxConnTime = servletConfig.getInitParameter("maxConnTime");
String maxCheckoutSeconds = servletConfig.getInitParameter("maxCheckoutSeconds");
if (isValid(varName) && isValid(driver) && isValid(jdbcUrl) && (user != null) && (password != null)
&& isValid(minConns) && isValid(maxConns) && isValid(maxConnTime) && isValid(maxCheckoutSeconds)) {
dataSource = new SimplePoolDataSource();
dataSource.setDriver(driver);
dataSource.setJdbcUrl(jdbcUrl);
dataSource.setUser(user);
dataSource.setPassword(password);
dataSource.setMinConns(minConns);
dataSource.setMaxConns(maxConns);
dataSource.setMaxConnTime(maxConnTime);
dataSource.setMaxCheckoutSeconds(maxCheckoutSeconds);
try {
dataSource.init();
servletConfig.getServletContext().setAttribute(varName, dataSource);
} catch (Exception e) {
log.error("An error occurred while starting the connection pool.", e);
throw new ServletException("Error starting the connection pool.");
}
} else {
log.error("One or more intialization parameter is invalid or missing.");
throw new ServletException("Invalid or missing initialization parameter.");
}
}
private boolean isValid(String s) {
if ((s != null) && (s.length() > 0)) {
return true;
}
return false;
}
}