spring中配置proxool数据源

方式一：
 在Spring的"applicationContext.xml"中的dataSource bean定义——

< bean  id ="dataSource"
    class ="org.logicalcobwebs.proxool.ProxoolDataSource" >
     < property  name ="driver" >
         < value > com.mysql.jdbc.Driver </ value >
     </ property >
     < property  name ="driverUrl" >
         < value > jdbc:mysql://localhost:3306/dbname?user=yourname &amp; password=yourpass </ value >
     </ property >
     < property  name ="user"  value ="yourname"   />
     < property  name ="password"  value ="yourpass"   />
     < property  name ="alias"  value ="Pool_dbname"   />
     < property  name ="houseKeepingSleepTime"  value ="90000"   />
     < property  name ="prototypeCount"  value ="0"   />
     < property  name ="maximumConnectionCount"  value ="50"   />
     < property  name ="minimumConnectionCount"  value ="2"   />
     < property  name ="simultaneousBuildThrottle"  value ="50"   />
     < property  name ="maximumConnectionLifetime"  value ="14400000"   />
     < property  name ="houseKeepingTestSql"  value ="select CURRENT_DATE"   />
</ bean >

第一种方式需要把用户名和密码写在连接串里面，
ProxoolDataSource类提供的user，password属性似乎没有什么用。
无论提供什么，它都会以空用户名、密码去连接数据库。
这可能是Proxool RC0.93的一个bug，实在让人恼火，不知道最新的0.9.1有没有fix这个bug。
不过配置中的user，password两个属性还必须设置，否则hibernate会报空指针错误。

方式二：
 在Spring的"applicationContext.xml"中的dataSource bean定义——

< bean  id ="dataSource"
    class ="org.springframework.jdbc.datasource.DriverManagerDataSource" >
     < property  name ="driverClassName" >
         < value > org.logicalcobwebs.proxool.ProxoolDriver </ value >
     </ property >
     < property  name ="url" >
         < value > proxool.Pool_dbname </ value >
     </ property >
</ bean >

第二种方式需要预先在"web.xml"先配置好Proxool连接池，配置如下：

< servlet >
     < servlet-name > proxoolServletConfigurator </ servlet-name >
     < servlet-class >
        org.logicalcobwebs.proxool.configuration.ServletConfigurator
     </ servlet-class >
     < init-param >
         < param-name > xmlFile </ param-name >
         < param-value > WEB-INF/proxool.xml </ param-value >
     </ init-param >
     < load-on-startup > 1 </ load-on-startup >
</ servlet >

< servlet >
     < servlet-name > context </ servlet-name >
     < servlet-class >
        org.springframework.web.context.ContextLoaderServlet
     </ servlet-class >
     < load-on-startup > 2 </ load-on-startup >
</ servlet >

注意，第二种方式下Spring的上下文加载如果想使用listener方式(Struts2要求)，
则与连接池有关的Bean全得延迟初始化。因为listener比servlet优先初始化，
如果相关Bean不是lazy-init的话，则启动服务器时会出现Bean找不到连接定义的异常。

 <listener>
  <listener-class>
      org.springframework.web.context.ContextLoaderListener
  </listener-class>
 </listener>

其中proxool的配置文件可以采用xmlFile"proxool.xml"或者propertyFile"proxool.properties"

"proxool.xml"格式如下：

<? xml version="1.0" encoding="UTF-8" ?>
< proxool-config >
    < proxool >
       < alias > Pool_dbname </ alias >
       < driver-url > jdbc:mysql://localhost:3306/dbname </ driver-url >
       < driver-class > com.mysql.jdbc.Driver </ driver-class >
       < driver-properties >
       < property  name ="user"  value ="yourname" />
       < property  name ="password"  value ="yourpass" />
       </ driver-properties >
       < house-keeping-sleep-time > 60000 </ house-keeping-sleep-time >
       < maximum-connection-count > 20 </ maximum-connection-count > 　
       < minimum-connection-count > 2 </ minimum-connection-count >
       < prototype-count > 0 </ prototype-count >
       < simultaneous-build-throttle > 20 </ simultaneous-build-throttle >
       < house-keeping-test-sql > select CURRENT_DATE </ house-keeping-test-sql >
       < statistics > 15s,10m,1d </ statistics >
       < statistics-log-level > INFO </ statistics-log-level >
    </ proxool >
    < proxool >
     <!-- 可以配置多个库 -->
    </ proxool >
</ proxool-config >

"proxool.properties"格式如下：

jdbc- 0 .proxool.alias = Pool_dbname
jdbc- 0 .proxool.driver-url = jdbc:mysql://localhost: 3306 /dbname
jdbc- 0 .proxool.driver-class = com.mysql.jdbc.Driver
jdbc- 0 .user = yourname
jdbc- 0 .password = yourpass
jdbc- 0 .proxool.house-keeping-sleep-time = 60000
jdbc- 0 .proxool.house-keeping-test-sql = select CURRENT_DATE
jdbc- 0 .proxool.maximum-connection-count = 10
jdbc- 0 .proxool.minimum-connection-count = 3
jdbc- 0 .proxool.maximum-connection-lifetime = 18000000
jdbc- 0 .proxool.prototype-count = 3
jdbc- 0 .proxool.simultaneous-build-throttle = 10
jdbc- 0 .proxool.recently-started-threshold = 60000
jdbc- 0 .proxool.overload-without-refusal-lifetime = 50000
jdbc- 0 .proxool.maximum-active-time = 60000
jdbc- 0 .proxool.verbose = true
jdbc- 0 .proxool.trace = true
jdbc- 0 .proxool.fatal-sql-exception = Fatal error

jdbc- 2 .proxool.alias = Pool_dbname2
……
<!--可以配置多个库-->

三、更详细的proxool.xml的配置属性说明: 

<?xml version="1.0" encoding="ISO-8859-1"?><!--
Properties for Proxool Configurator testing. Defines the same parameters as
TestHelper.buildCompleteAlternativeProperties()
-->
<something-else-entirely xmlns="http://sumthin.else.entirely" xmlns:proxool="The latest version is available at http://proxool.sourceforge.net/xml-namespace">
    <proxool:proxool>
        <proxool:alias>xml-test-ns</proxool:alias>
        <proxool:driver-url>jdbc:hsqldb:db/test</proxool:driver-url>
        <proxool:driver-class>org.hsqldb.jdbcDriver</proxool:driver-class>
        <proxool:driver-properties>
            <proxool:property name="user" value="sa"/>
            <proxool:property name="password" value=""/>
        </proxool:driver-properties>
        <proxool:house-keeping-sleep-time>40000</proxool:house-keeping-sleep-time>
        <proxool:house-keeping-test-sql>select CURRENT_DATE</proxool:house-keeping-test-sql>
        <proxool:maximum-connection-count>10</proxool:maximum-connection-count>
        <proxool:minimum-connection-count>3</proxool:minimum-connection-count>
        <proxool:maximum-connection-lifetime>18000000</proxool:maximum-connection-lifetime> <!-- 5 hours -->
        <proxool:simultaneous-build-throttle>5</proxool:simultaneous-build-throttle>
        <proxool:recently-started-threshold>40000</proxool:recently-started-threshold>
        <proxool:overload-without-refusal-lifetime>50000</proxool:overload-without-refusal-lifetime>
        <proxool:maximum-active-time>60000</proxool:maximum-active-time>
        <proxool:verbose>true</proxool:verbose>
        <proxool:trace>true</proxool:trace>
        <proxool:fatal-sql-exception>Fatal error</proxool:fatal-sql-exception>
        <proxool:prototype-count>2</proxool:prototype-count>
    </proxool:proxool>
    <nothing-to-do-with-proxool>
        <proxool:proxool>
            <proxool:alias>xml-test-ns-2</proxool:alias>
            <proxool:driver-url>jdbc:hsqldb:db/test</proxool:driver-url>
            <proxool:driver-class>org.hsqldb.jdbcDriver</proxool:driver-class>
            <proxool:driver-properties>
                <proxool:property name="user" value="sa"/>
                <proxool:property name="password" value=""/>
            </proxool:driver-properties>
            <proxool:house-keeping-sleep-time>40000</proxool:house-keeping-sleep-time>
            <proxool:house-keeping-test-sql>select CURRENT_DATE</proxool:house-keeping-test-sql>
            <proxool:maximum-connection-count>10</proxool:maximum-connection-count>
            <proxool:minimum-connection-count>3</proxool:minimum-connection-count>
            <proxool:maximum-connection-lifetime>18000000</proxool:maximum-connection-lifetime> <!-- 5 hours -->
            <proxool:simultaneous-build-throttle>5</proxool:simultaneous-build-throttle>
            <proxool:recently-started-threshold>40000</proxool:recently-started-threshold>
            <proxool:overload-without-refusal-lifetime>50000</proxool:overload-without-refusal-lifetime>
            <proxool:maximum-active-time>60000</proxool:maximum-active-time>
            <proxool:verbose>true</proxool:verbose>
            <proxool:trace>true</proxool:trace>
            <proxool:fatal-sql-exception>Fatal error</proxool:fatal-sql-exception>
            <proxool:prototype-count>2</proxool:prototype-count>
        </proxool:proxool>
    </nothing-to-do-with-proxool>
</something-else-entirely>

属性列表说明:

fatal-sql-exception: 它是一个逗号分割的信息片段.当一个SQL异常发生时,他的异常信息将与这个信息片段进行比较.如果在片段中存在,那么这个异常将被认为是个致命错误(Fatal SQL Exception ).这种情况下,数据库连接将要被放弃.无论发生什么,这个异常将会被重掷以提供给消费者.用户最好自己配置一个不同的异常来抛出.

fatal-sql-exception-wrapper-class:正如上面所说,你最好配置一个不同的异常来重掷.利用这个属性,用户可以包装SQLException,使他变成另外一个异常.这个异常或者继承SQLException或者继承字RuntimeException.proxool自带了2个实现:'org.logicalcobwebs.proxool.FatalSQLException' 和'org.logicalcobwebs.proxool.FatalRuntimeException' .后者更合适.

house-keeping-sleep-time: house keeper 保留线程处于睡眠状态的最长时间,house keeper 的职责就是检查各个连接的状态,并判断是否需要销毁或者创建.

house-keeping-test-sql:  如果发现了空闲的数据库连接.house keeper 将会用这个语句来测试.这个语句最好非常快的被执行.如果没有定义,测试过程将会被忽略。

injectable-connection-interface: 允许proxool实现被代理的connection对象的方法.

injectable-statement-interface: 允许proxool实现被代理的Statement 对象方法.

injectable-prepared-statement-interface: 允许proxool实现被代理的PreparedStatement 对象方法.

injectable-callable-statement-interface: 允许proxool实现被代理的CallableStatement 对象方法.

jmx: 略

jmx-agent-id: 略

jndi-name: 数据源的名称

maximum-active-time: 如果housekeeper 检测到某个线程的活动时间大于这个数值.它将会杀掉这个线程.所以确认一下你的服务器的带宽.然后定一个合适的值.默认是5分钟.

maximum-connection-count: 最大的数据库连接数.

maximum-connection-lifetime: 一个线程的最大寿命.

minimum-connection-count: 最小的数据库连接数

overload-without-refusal-lifetime: 略

prototype-count: 连接池中可用的连接数量.如果当前的连接池中的连接少于这个数值.新的连接将被建立(假设没有超过最大可用数).例如.我们有3个活动连接2个可用连接,而我们的prototype-count是4,那么数据库连接池将试图建立另外2个连接.这和 minimum-connection-count不同. minimum-connection-count把活动的连接也计算在内.prototype-count 是spare connections 的数量.

recently-started-threshold:  略

simultaneous-build-throttle:  略

statistics:  连接池使用状况统计。 参数“10s,1m,1d”

statistics-log-level:  日志统计跟踪类型。 参数“ERROR”或 “INFO”

test-before-use: 略

test-after-use: 略

trace: 如果为true,那么每个被执行的SQL语句将会在执行期被log记录(DEBUG LEVEL).你也可以注册一个ConnectionListener (参看ProxoolFacade)得到这些信息.

 

verbose: 详细信息设置。 参数 bool 值   

 

四、还可以配置管理proxool的servlet

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
	http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>
  <servlet-name>ServletConfigurator</servlet-name>
  <servlet-class>
    org.logicalcobwebs.proxool.configuration.ServletConfigurator
  </servlet-class>
  <init-param>
    <param-name>xmlFile</param-name>
    <param-value>WEB-INF/proxool.xml</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
</servlet>

<servlet>
  <servlet-name>Admin</servlet-name>
  <servlet-class>
    org.logicalcobwebs.proxool.admin.servlet.AdminServlet
  </servlet-class>
</servlet>
<servlet-mapping>
  <servlet-name>Admin</servlet-name>
  <url-pattern>/admin</url-pattern>
</servlet-mapping>
<!-- 配置受保护域，只有Tomcat管理员才能察看连接池的信息 -->
<security-constraint>
  <web-resource-collection>
      <web-resource-name>proxool</web-resource-name> 
      <url-pattern>/admin</url-pattern>
  </web-resource-collection>
  <auth-constraint>
     <role-name>manager</role-name> 
     </auth-constraint>
  </security-constraint>
 <login-config>
     <auth-method>BASIC</auth-method> 
     <realm-name>proxool manager Application</realm-name> 
  </login-config>
  <security-role>
    <description>The role that is required to log in to the Manager Application</description> 
     <role-name>manager</role-name> 
 </security-role>
  <error-page>
    <error-code>401</error-code>
    <location>/401.jsp</location>
  </error-page>
</web-app>