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Intial import.

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Erik C. Thauvin 2004-03-17 04:19:51 +00:00
commit bfc101df5b
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.cvsignore Normal file
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*.ipr
*.iml
*.iws
bin
dist
build
classes

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build.properties Normal file
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appname=simplepool
path.classes=build
path.src=src
path.dist=dist
path.lib=lib

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<?xml version="1.0" encoding="UTF-8"?>
<project name="simplepool" default="build" basedir=".">
<property file="${basedir}/build.properties" />
<path id="path.source">
<pathelement location="${path.src}" />
</path>
<path id="path.class">
<fileset dir="${path.lib}">
<include name="**/*.jar"/>
</fileset>
</path>
<target name="init">
<tstamp />
<mkdir dir="${path.classes}"/>
<mkdir dir="${path.dist}"/>
</target>
<target name="compile" depends="init" description="Compiles sources">
<mkdir dir="${path.classes}" />
<javac sourcepathref="path.source" classpathref="path.class" destdir="${path.classes}" debug="off" deprecation="on">
<src refid="path.source" />
</javac>
</target>
<target name="build" depends="clean,compile,jar" description="Rebuilds project" />
<target name="jar" depends="compile" description="Builds the JAR">
<copy todir="${path.classes}">
<fileset dir="${path.src}" includes="*.properties" />
</copy>
<jar destfile="${basedir}/${path.dist}/${appname}.jar" basedir="${path.classes}" excludes="**/.dependency-info/**" />
</target>
<target name="clean" depends="init" description="Removes classses and javadoc">
<delete quiet="true" includeEmptyDirs="true">
<fileset dir="${path.classes}" includes="*,*/**"/>
<fileset dir="${path.dist}" includes="*,*/**"/>
</delete>
</target>
</project>

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<Server port="8005" shutdown="SHUTDOWN" debug="0">
<Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" debug="0"/>
<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" debug="0"/>
<GlobalNamingResources>
<Resource name="UserDatabase" auth="Container" type="org.apache.catalina.UserDatabase"/>
<ResourceParams name="UserDatabase">
<parameter>
<name>factory</name>
<value>org.apache.catalina.users.MemoryUserDatabaseFactory</value>
</parameter>
<parameter>
<name>pathname</name>
<value>conf/tomcat-users.xml</value>
</parameter>
</ResourceParams>
<Resource name="jdbc/PooledDS" type="javax.sql.DataSource" auth="Container"/>
<ResourceParams name="jdbc/PooledDS">
<parameter>
<name>factory</name>
<value>net.java.dev.simplepool.SimplePoolDataSourceFactory</value>
</parameter>
<parameter>
<name>driver</name>
<value>com.mysql.jdbc.Driver</value>
</parameter>
<parameter>
<name>user</name>
<value>dbuser</value>
</parameter>
<parameter>
<name>password</name>
<value>test</value>
</parameter>
<parameter>
<name>jdbcUrl</name>
<value>jdbc:mysql://localhost:3306/dbname</value>
</parameter>
<parameter>
<name>minConns</name>
<value>8</value>
</parameter>
<parameter>
<name>maxConns</name>
<value>30</value>
</parameter>
<parameter>
<name>maxConnTime</name>
<value>1</value>
</parameter>
<parameter>
<name>maxCheckoutSeconds</name>
<value>60</value>
</parameter>
</ResourceParams>
</GlobalNamingResources>
<Service name="Catalina">
<Connector port="80"
maxThreads="150"
minSpareThreads="25"
maxSpareThreads="75"
enableLookups="false"
redirectPort="8443"
acceptCount="100"
debug="0"
connectionTimeout="20000"
proxyPort="80"
/>
<Engine name="Catalina" defaultHost="www.waveblog.com" debug="0">
<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
debug="1" resourceName="UserDatabase"/>
<Host name="localhost"
debug="1" appBase="webapps" unpackWARs="true" autoDeploy="true"
xmlValidation="false" xmlNamespaceAware="false">
<Context path="" docBase="ROOT" debug="0" reloadable="true">
<ResourceLink name="jdbc/PooledDS" global="jdbc/PooledDS" type="javax.sql.DataSource" />
</Context>
<Valve className="org.apache.catalina.valves.AccessLogValve"
directory="logs" prefix="waveblog" suffix=".log"
pattern="combined" resolveHosts="false"/>
</Host>
</Engine>
</Service>
</Server>

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<% out.write("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"); %>
<%@ page contentType="text/xml;charset=UTF-8"%>
<%@ page session="false"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql" %>
<sql:setDataSource dataSource="jdbc/PooledDS" />
<sql:query var="page" maxRows="30">
select * from entry
</sql:query>
<document>
<c:forEach var="row" items="${page.rows}" varStatus="counter">
<entry>
<count><c:out value="${counter.count}"/></count>
<id><c:out value="${row.id}"/></id>
<title><c:out value="${row.name}"/></title>
</entry>
</c:forEach>
</document>

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src/net/java/dev/simplepool/SimplePool.java Normal file
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/**
* $Source$
* $Revision$
* $Date$
*
* Copyright (c) 2002, Marc A. Mnich (http://www.javaexchange.com/)
* All rights reserved.
*
* 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.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License, please see:
*
* http://www.javaexchange.com/GPL.html
*/
package net.java.dev.simplepool;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.io.IOException;
import java.sql.*;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
* SimplePool
*
* @author Marc A. Mnich
* @author Russell Beattie
* @author Erik C. Thauvin
* @version $Revision$, $Date$
* @since 1.0
*/
public class SimplePool implements Runnable {
private static final Log log = LogFactory.getLog(SimplePool.class);
private Thread runner;
private Connection[] connPool;
private int[] connStatus;
private long[] connLockTime;
private long[] connCreateDate;
private String[] connID;
private String driver;
private String jdbcUrl;
private String user;
private String password;
private int currConnections;
private int connLast;
private int maxConns;
private int maxConnMSec;
private int maxCheckoutSeconds = 60;
//available: set to false on destroy, checked by getConnection()
private boolean available = true;
private SQLWarning currSQLWarning;
/**
* Creates a new Connection Broker<br>
* driver: JDBC driver. e.g. 'oracle.jdbc.driver.OracleDriver'<br>
* jdbcUrl: JDBC connect string. e.g. 'jdbc:oracle:thin:@203.92.21.109:1526:orcl'<br>
* user: Database login name. e.g. 'Scott'<br>
* password: Database password. e.g. 'Tiger'<br>
* minConns: Minimum number of connections to start with.<br>
* maxConns: Maximum number of connections in dynamic pool.<br>
* maxConnTime: Time in days between connection resets. (Reset does a basic cleanup)<br>
* maxCheckoutSeconds: Max time a connection can be checked out before being recycled. Zero value turns option off, default is 60 seconds.
*/
public SimplePool(String driver, String jdbcUrl, String user,
String password, int minConns, int maxConns, double maxConnTime, int maxCheckoutSeconds)
throws IOException {
this.connPool = new Connection[maxConns];
this.connStatus = new int[maxConns];
this.connLockTime = new long[maxConns];
this.connCreateDate = new long[maxConns];
this.connID = new String[maxConns];
this.currConnections = minConns;
this.maxConns = maxConns;
this.driver = driver;
this.jdbcUrl = jdbcUrl;
this.user = user;
this.password = password;
this.maxCheckoutSeconds = maxCheckoutSeconds;
this.maxConnMSec = (int) (maxConnTime * 86400000.0); //86400 sec/day
if (this.maxConnMSec < 30000) { // Recycle no less than 30 seconds.
this.maxConnMSec = 30000;
}
log.info("-----------------------------------------");
log.info("Starting Connection Pool:");
log.info("driver = " + driver);
log.info("jdbcUrl = " + jdbcUrl);
log.info("user = " + user);
log.info("minconnections = " + minConns);
log.info("maxconnections = " + maxConns);
log.info("Total refresh interval = " + maxConnTime + " days");
log.info("maxCheckoutSeconds = " + maxCheckoutSeconds);
log.info("-----------------------------------------");
// Initialize the pool of connections with the mininum connections:
// Problems creating connections may be caused during reboot when the
// servlet is started before the database is ready. Handle this
// by waiting and trying again. The loop allows 5 minutes for
// db reboot.
boolean connectionsSucceeded = false;
int dbLoop = 20;
try {
for (int i = 1; i < dbLoop; i++) {
try {
for (int j = 0; j < currConnections; j++) {
createConn(j);
}
connectionsSucceeded = true;
break;
} catch (SQLException e) {
log.error("Attempt (" + String.valueOf(i) +
" of " + String.valueOf(dbLoop) +
") failed to create new connections set at startup.", e);
log.warn("Will try again in 15 seconds...");
try {
Thread.sleep(15000L);
} catch (InterruptedException ignore) {
;
}
}
}
if (!connectionsSucceeded) { // All attempts at connecting to db exhausted
throw new IOException("All attempts at connecting to Database exhausted.");
}
} catch (Exception e) {
log.fatal(e.getMessage(), e);
throw new IOException(e.getMessage());
}
// Fire up the background housekeeping thread
runner = new Thread(this);
runner.start();
}
/**
* Housekeeping thread. Runs in the background with low CPU overhead.
* Connections are checked for warnings and closure and are periodically
* restarted.
* This thread is a catchall for corrupted
* connections and prevents the buildup of open cursors. (Open cursors
* result when the application fails to close a Statement).
* This method acts as fault tolerance for bad connection/statement programming.
*/
public void run() {
boolean forever = true;
Statement stmt = null;
long maxCheckoutMillis = (long) (maxCheckoutSeconds * 1000);
while (forever) {
// Get any Warnings on connections and print to event file
for (int i = 0; i < currConnections; i++) {
try {
currSQLWarning = connPool[i].getWarnings();
if (currSQLWarning != null) {
log.debug("Warnings on connection [" + String.valueOf(i) + "]: " + currSQLWarning);
connPool[i].clearWarnings();
}
} catch (SQLException e) {
log.debug("Cannot access connection [" + String.valueOf(i) + "] warnings.", e);
}
}
for (int i = 0; i < currConnections; i++) { // Do for each connection
long age = System.currentTimeMillis() - connCreateDate[i];
try { // Test the connection with createStatement call
synchronized (connStatus) {
if (connStatus[i] > 0) { // In use, catch it next time!
// Check the time it's been checked out and recycle
long timeInUse = System.currentTimeMillis() -
connLockTime[i];
log.warn("Connection [" + i +
"] in use for " + timeInUse +
" ms.");
if (maxCheckoutMillis != 0) {
if (timeInUse > maxCheckoutMillis) {
log.warn("Connection [" +
i + "] failed to be returned in time. Recycling...");
throw new SQLException();
}
}
continue;
}
connStatus[i] = 2; // Take offline (2 indicates housekeeping lock)
}
if (age > maxConnMSec) { // Force a reset at the max conn time
throw new SQLException();
}
stmt = connPool[i].createStatement();
connStatus[i] = 0; // Connection is O.K.
log.trace("Connection [" + String.valueOf(i) + "] confirmed.");
// Some DBs return an object even if DB is shut down
if (connPool[i].isClosed()) {
throw new SQLException();
}
// Connection has a problem, restart it
} catch (SQLException e) {
log.debug("Recycling connection [" + String.valueOf(i) + ']');
try {
connPool[i].close();
} catch (SQLException e0) {
log.warn("Can't close connection [" + String.valueOf(i) + "]. Might have been closed already. Trying to recycle anyway...", e);
}
try {
createConn(i);
} catch (SQLException e1) {
log.warn("Failed to create connection [" + String.valueOf(i) + ']', e1);
connStatus[i] = 0; // Can't open, try again next time
}
} finally {
try {
if (stmt != null) {
stmt.close();
}
} catch (SQLException ignore) {
;
}
}
}
try {
Thread.sleep(20000L);
} // Wait 20 seconds for next cycle
catch (InterruptedException e) {
// Returning from the run method sets the internal
// flag referenced by Thread.isAlive() to false.
// This is required because we don't use stop() to
// shutdown this thread.
return;
}
}
} // End run
/**
* This method hands out the connections in round-robin order.
* This prevents a faulty connection from locking
* up an application entirely. A browser 'refresh' will
* get the next connection while the faulty
* connection is cleaned up by the housekeeping thread.
* <p/>
* If the min number of threads are ever exhausted, new
* threads are added up the the max thread count.
* Finally, if all threads are in use, this method waits
* 2 seconds and tries again, up to ten times. After that, it
* returns a null.
*/
public Connection getConnection() {
Connection conn = null;
if (available) {
boolean gotOne = false;
for (int outerloop = 1; outerloop <= 10; outerloop++) {
try {
int loop = 0;
int roundRobin = connLast + 1;
if (roundRobin >= currConnections) {
roundRobin = 0;
}
do {
synchronized (connStatus) {
if ((connStatus[roundRobin] < 1) &&
(!connPool[roundRobin].isClosed())) {
conn = connPool[roundRobin];
connStatus[roundRobin] = 1;
connLockTime[roundRobin] = System.currentTimeMillis();
connLast = roundRobin;
gotOne = true;
break;
} else {
loop++;
roundRobin++;
if (roundRobin >= currConnections) {
roundRobin = 0;
}
}
}
} while ((!gotOne) && (loop < currConnections));
} catch (SQLException e1) {
log.debug(e1.getMessage(), e1);
}
if (gotOne) {
break;
} else {
synchronized (this) { // Add new connections to the pool
if (currConnections < maxConns) {
try {
createConn(currConnections);
currConnections++;
} catch (SQLException e) {
log.error("Unable to create new connection.", e);
}
}
}
try {
Thread.sleep(2000L);
} catch (InterruptedException ignore) {
;
}
log.debug("Connections Exhausted. Will wait and try again in loop " +
String.valueOf(outerloop));
}
} // End of try 10 times loop
} else {
log.debug("Unsuccessful getConnection() request during destroy()");
} // End if(available)
log.debug("Handing out connection [" +
idOfConnection(conn) + "]: " +
(new SimpleDateFormat("MM/dd/yyyy hh:mm:ss a")).format(new Date()));
return conn;
}
/**
* Returns the local JDBC ID for a connection.
*/
public int idOfConnection(Connection conn) {
int match = -1;
String tag;
try {
tag = conn.toString();
} catch (NullPointerException e1) {
tag = "none";
}
for (int i = 0; i < currConnections; i++) {
if (connID[i].equals(tag)) {
match = i;
break;
}
}
return match;
}
/**
* Frees a connection. Replaces connection back into the main pool for
* reuse.
*/
public String freeConnection(Connection conn) {
String res = "";
int thisconn = idOfConnection(conn);
if (thisconn >= 0) {
connStatus[thisconn] = 0;
res = "freed " + conn.toString();
log.debug("Freed connection [" + String.valueOf(thisconn) + ']');
} else {
log.error("Could not free connection [" + String.valueOf(thisconn) + ']');
}
return res;
}
/**
* Returns the age of a connection -- the time since it was handed out to
* an application.
*/
public long getAge(Connection conn) { // Returns the age of the connection in millisec.
int thisconn = idOfConnection(conn);
return System.currentTimeMillis() - connLockTime[thisconn];
}
private void createConn(int i)
throws SQLException {
Date now = new Date();
try {
Class.forName(driver);
connPool[i] = DriverManager.getConnection
(jdbcUrl, user, password);
connStatus[i] = 0;
connID[i] = connPool[i].toString();
connLockTime[i] = 0L;
connCreateDate[i] = now.getTime();
} catch (ClassNotFoundException e2) {
log.debug("Error creating connection. The driver could not be loaded.", e2);
}
log.debug("Opening connection [" + String.valueOf(i) +
"]: " + connPool[i].toString());
}
/**
* Shuts down the housekeeping thread and closes all connections
* in the pool. Call this method from the destroy() method of the servlet.
*/
/**
* Multi-phase shutdown. having following sequence:
* <OL>
* <LI><code>getConnection()</code> will refuse to return connections.
* <LI>The housekeeping thread is shut down.<br>
* Up to the time of <code>millis</code> milliseconds after shutdown of
* the housekeeping thread, <code>freeConnection()</code> can still be
* called to return used connections.
* <LI>After <code>millis</code> milliseconds after the shutdown of the
* housekeeping thread, all connections in the pool are closed.
* <LI>If any connections were in use while being closed then a
* <code>SQLException</code> is thrown.
* <LI>The log is closed.
* </OL><br>
* Call this method from a servlet destroy() method.
*
* @param millis the time to wait in milliseconds.
* @throws SQLException if connections were in use after
* <code>millis</code>.
*/
public void destroy(int millis) throws SQLException {
log.info("Shutting down SimplePool.");
// Checking for invalid negative arguments is not necessary,
// Thread.join() does this already in runner.join().
// Stop issuing connections
available = false;
// Shut down the background housekeeping thread
runner.interrupt();
// Wait until the housekeeping thread has died.
try {
runner.join((long) millis);
} catch (InterruptedException ignore) {
;
}
// The housekeeping thread could still be running
// (e.g. if millis is too small). This case is ignored.
// At worst, this method will throw an exception with the
// clear indication that the timeout was too short.
long startTime = System.currentTimeMillis();
// Wait for freeConnection() to return any connections
// that are still used at this time.
int useCount;
while ((useCount = getUseCount()) > 0 && System.currentTimeMillis() - startTime <= millis) {
try {
Thread.sleep(500L);
} catch (InterruptedException ignore) {
;
}
}
// Close all connections, whether safe or not
for (int i = 0; i < currConnections; i++) {
try {
connPool[i].close();
} catch (SQLException e1) {
log.debug("Cannot close connections on Destroy.");
}
}
if (useCount > 0) {
//bt-test successful
String msg = "Unsafe shutdown: Had to close " + useCount + " active DB connections after " + millis + "ms.";
log.error(msg);
// Throwing following Exception is essential because servlet authors
// are likely to have their own error logging requirements.
throw new SQLException(msg);
}
}//End destroy()
/**
* Less safe shutdown. Uses default timeout value.
* This method simply calls the <code>destroy()</code> method
* with a <code>millis</code>
* value of 10000 (10 seconds) and ignores <code>SQLException</code>
* thrown by that method.
*
* @see #destroy(int)
*/
public void destroy() {
try {
destroy(10000);
} catch (SQLException e) {
;
}
}
/**
* Returns the number of connections in use.
*/
// This method could be reduced to return a counter that is
// maintained by all methods that update connStatus.
// However, it is more efficient to do it this way because:
// Updating the counter would put an additional burden on the most
// frequently used methods; in comparison, this method is
// rarely used (although essential).
public int getUseCount() {
int useCount = 0;
synchronized (connStatus) {
for (int i = 0; i < currConnections; i++) {
if (connStatus[i] > 0) { // In use
useCount++;
}
}
}
return useCount;
}//End getUseCount()
/**
* Returns the number of connections in the dynamic pool.
*/
public int getSize() {
return currConnections;
}//End getSize()
}// End class

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/**
* $Source$
* $Revision$
* $Date$
*
* 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 java.sql.*;
import java.util.Map;
/**
* SimplePoolConnection
*
* @author Russell Beattie
* @author Erik C. Thauvin
* @version $Revision$, $Date$
* @since 1.0
*/
public class SimplePoolConnection implements Connection {
protected Connection conn;
protected SimplePool broker;
public SimplePoolConnection(SimplePool broker) {
this.broker = broker;
conn = broker.getConnection();
}
public void setAutoCommit(boolean arg0)
throws SQLException {
conn.setAutoCommit(arg0);
}
public boolean getAutoCommit()
throws SQLException {
return conn.getAutoCommit();
}
public void setCatalog(String arg0)
throws SQLException {
conn.setCatalog(arg0);
}
public String getCatalog()
throws SQLException {
return conn.getCatalog();
}
public boolean isClosed()
throws SQLException {
return conn.isClosed();
}
public void setHoldability(int arg0)
throws SQLException {
conn.setHoldability(arg0);
}
public int getHoldability()
throws SQLException {
return conn.getHoldability();
}
public DatabaseMetaData getMetaData()
throws SQLException {
return conn.getMetaData();
}
public void setReadOnly(boolean arg0)
throws SQLException {
conn.setReadOnly(arg0);
}
public boolean isReadOnly()
throws SQLException {
return conn.isReadOnly();
}
public Savepoint setSavepoint()
throws SQLException {
return conn.setSavepoint();
}
public Savepoint setSavepoint(String arg0)
throws SQLException {
return conn.setSavepoint(arg0);
}
public void setTransactionIsolation(int arg0)
throws SQLException {
conn.setTransactionIsolation(arg0);
}
public int getTransactionIsolation()
throws SQLException {
return conn.getTransactionIsolation();
}
public void setTypeMap(Map arg0)
throws SQLException {
conn.setTypeMap(arg0);
}
public Map getTypeMap()
throws SQLException {
return conn.getTypeMap();
}
public SQLWarning getWarnings()
throws SQLException {
return conn.getWarnings();
}
public void clearWarnings()
throws SQLException {
conn.clearWarnings();
}
public void close()
throws SQLException {
broker.freeConnection(conn);
}
public void commit()
throws SQLException {
conn.commit();
}
public Statement createStatement()
throws SQLException {
return conn.createStatement();
}
public Statement createStatement(int arg0, int arg1)
throws SQLException {
return conn.createStatement(arg0, arg1);
}
public Statement createStatement(int arg0, int arg1, int arg2)
throws SQLException {
return conn.createStatement(arg0, arg1, arg2);
}
public String nativeSQL(String arg0)
throws SQLException {
return conn.nativeSQL(arg0);
}
public CallableStatement prepareCall(String arg0)
throws SQLException {
return conn.prepareCall(arg0);
}
public CallableStatement prepareCall(String arg0, int arg1, int arg2)
throws SQLException {
return conn.prepareCall(arg0, arg1, arg2);
}
public CallableStatement prepareCall(String arg0, int arg1, int arg2, int arg3)
throws SQLException {
return conn.prepareCall(arg0, arg1, arg2, arg3);
}
public PreparedStatement prepareStatement(String arg0)
throws SQLException {
return conn.prepareStatement(arg0);
}
public PreparedStatement prepareStatement(String arg0, int arg1)
throws SQLException {
return conn.prepareStatement(arg0);
}
public PreparedStatement prepareStatement(String arg0, int arg1, int arg2)
throws SQLException {
return conn.prepareStatement(arg0, arg1, arg2);
}
public PreparedStatement prepareStatement(String arg0, int arg1, int arg2, int arg3)
throws SQLException {
return conn.prepareStatement(arg0, arg1, arg2, arg3);
}
public PreparedStatement prepareStatement(String arg0, int[] arg1)
throws SQLException {
return conn.prepareStatement(arg0, arg1);
}
public PreparedStatement prepareStatement(String arg0, String[] arg1)
throws SQLException {
return conn.prepareStatement(arg0, arg1);
}
public void releaseSavepoint(Savepoint arg0)
throws SQLException {
conn.releaseSavepoint(arg0);
}
public void rollback()
throws SQLException {
conn.rollback();
}
public void rollback(Savepoint arg0)
throws SQLException {
conn.rollback(arg0);
}
}

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/**
* $Source$
* $Revision$
* $Date$
*
* 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 javax.sql.DataSource;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.SQLException;
/**
* SimplePoolDataSource
*
* @author Russell Beattie
* @author Erik C. Thauvin
* @version $Revision$, $Date$
* @since 1.0
*/
public class SimplePoolDataSource implements DataSource {
protected PrintWriter logWriter = new PrintWriter(System.out);
protected SimplePool broker = null;
private String driver = "";
private String jdbcUrl = "";
private String user = "";
private String password = "";
private String minConns = "";
private String maxConns = "";
private String maxConnTime = "";
private String maxCheckoutSeconds = "";
public SimplePoolDataSource() {
;
}
public void init() throws Exception {
broker = new SimplePool(driver, jdbcUrl, user, password,
Integer.parseInt(minConns), Integer.parseInt(maxConns),
Double.parseDouble(maxConnTime), Integer.parseInt(maxCheckoutSeconds));
}
public Connection getConnection() throws SQLException {
if (broker == null) {
try {
init();
} catch (Exception e) {
throw new SQLException("Error initializing Connection Broker.");
}
}
return new SimplePoolConnection(broker);
}
public Connection getConnection(String user, String password)
throws SQLException {
throw new SQLException("Not supported in this DataSource.");
}
public void setLogWriter(PrintWriter output) throws SQLException {
logWriter = output;
}
public PrintWriter getLogWriter() {
return logWriter;
}
public void setLoginTimeout(int seconds) throws SQLException {
}
public int getLoginTimeout() {
return 0;
}
public void close() {
broker.destroy();
broker = null;
}
// GET/SETs
public void setDriver(String val) {
driver = val;
}
public String getDriver() {
return driver;
}
public void setJdbcUrl(String val) {
jdbcUrl = val;
}
public String getJdbcUrl() {
return jdbcUrl;
}
public void setUser(String val) {
user = val;
}
public String getUser() {
return user;
}
public void setPassword(String val) {
password = val;
}
public String getPassword() {
return password;
}
public void setMinConns(String val) {
minConns = val;
}
public String getMinConns() {
return minConns;
}
public void setMaxConns(String val) {
maxConns = val;
}
public String getMaxConns() {
return maxConns;
}
public void setMaxConnTime(String val) {
maxConnTime = val;
}
public String getMaxConnTime() {
return maxConnTime;
}
public void setMaxCheckoutSeconds(String val) {
maxCheckoutSeconds = val;
}
public String getMaxCheckoutSeconds() {
return maxCheckoutSeconds;
}
}

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/**
* $Source$
* $Revision$
* $Date$
*
* 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 javax.naming.Context;
import javax.naming.Name;
import javax.naming.Reference;
import javax.naming.spi.ObjectFactory;
import java.util.Hashtable;
/**
* SimplePoolDataSourceFactory
*
* @author Russell Beattie
* @author Erik C. Thauvin
* @version $Revision$, $Date$
* @since 1.0
*/
public class SimplePoolDataSourceFactory implements ObjectFactory {
public Object getObjectInstance(Object obj, Name name, Context ctx, Hashtable env)
throws Exception {
Reference ref = (Reference) obj;
SimplePoolDataSource dataSource = new SimplePoolDataSource();
/*
driver: JDBC driver. e.g. 'oracle.jdbc.driver.OracleDriver'<br>
jdbcUrl: JDBC connect string. e.g. 'jdbc:oracle:thin:@203.92.21.109:1526:orcl'<br>
user: Database login name. e.g. 'Scott'<br>
password: Database password. e.g. 'Tiger'<br>
minConns: Minimum number of connections to start with.<br>
maxConns: Maximum number of connections in dynamic pool.<br>
maxConnTime: Time in days between connection resets. (Reset does a basic cleanup)<br>
maxCheckoutSeconds: Max time a connection can be checked out before being recycled. Zero value turns option off, default is 60 seconds.
*/
String driver = (String) ref.get("driver").getContent();
if (driver != null) {
dataSource.setDriver(driver);
}
String user = (String) ref.get("user").getContent();
if (user != null) {
dataSource.setUser(user);
}
String password = (String) ref.get("password").getContent();
if (password != null) {
dataSource.setPassword(password);
}
String jdbcUrl = (String) ref.get("jdbcUrl").getContent();
if (jdbcUrl != null) {
dataSource.setJdbcUrl(jdbcUrl);
}
String minConns = (String) ref.get("minConns").getContent();
if (minConns != null) {
dataSource.setMinConns(minConns);
}
String maxConns = (String) ref.get("maxConns").getContent();
if (maxConns != null) {
dataSource.setMaxConns(maxConns);
}
String maxConnTime = (String) ref.get("maxConnTime").getContent();
if (maxConnTime != null) {
dataSource.setMaxConnTime(maxConnTime);
}
String maxCheckoutSeconds = (String) ref.get("maxCheckoutSeconds").getContent();
if (maxCheckoutSeconds != null) {
dataSource.setMaxCheckoutSeconds(maxCheckoutSeconds);
}
dataSource.init();
return dataSource;
}
}

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/**
* $Source$
* $Revision$
* $Date$
*
* 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;
/**
* SimplePoolServlet
*
* @author Russell Beattie
* @author Erik C. Thauvin
* @version $Revision$, $Date$
* @since 1.0
*/
public class SimplePoolServlet extends HttpServlet {
private static final Log log = LogFactory.getLog(SimplePoolServlet.class);
private static SimplePoolDataSource dataSource;
public void destroy() {
if (dataSource != null) {
dataSource.close();
}
}
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;
}
}