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proxool一个数据库连接池框架,提供了对你选择的其它类型的驱动程序的连接池封装。可以非常简单的移植到现存的代码中。完全可配置。快速,成熟,健壮。可以透明地为你现存的JDBC驱动程序增加连接池功能。到目前为止最新版本是proxool 0.9.1,可从官网下载最新版本
http://proxool.sourceforge.net
一、配置proxool.xml文件
Xml代码
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xml version="1.0" encoding="UTF-8"?>
the proxool configuration can be embedded within your own
application's. Anything outside the "proxool" tag is ignored.
-->
something-else-entirely>
proxool>
alias>dbnamealias>
driver-url>jdbc:oracle:thin:@127.0.0.1:1521:testdbdriver-url>
driver-class>oracle.jdbc.driver.OracleDriverdriver-class>
driver-properties>
property name="user" value="username" />
property name="password" value="password" />
driver-properties>
maximum-connection-count>100maximum-connection-count>
minimum-connection-count>10minimum-connection-count>
house-keeping-sleep-time>90000house-keeping-sleep-time>
maximum-new-connections>10maximum-new-connections>
prototype-count>5prototype-count>
test-before-use>truetest-before-use>
house-keeping-test-sql>select sysdate from dualhouse-keeping-test-sql>
proxool>
something-else-entirely>
dbname
jdbc:oracle:thin:@127.0.0.1:1521:testdb
oracle.jdbc.driver.OracleDriver
100
10
90000
10
5
true
select sysdate from dual
二、配置web.xml
Xml代码
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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>ServletConfiguratorservlet-name>
servlet-class>
org.logicalcobwebs.proxool.configuration.ServletConfigurator
servlet-class>
init-param>
param-name>xmlFileparam-name>
param-value>WEB-INF/proxool.xmlparam-value>
init-param>
load-on-startup>1load-on-startup>
servlet>
servlet>
servlet-name>Adminservlet-name>
servlet-class>
org.logicalcobwebs.proxool.admin.servlet.AdminServlet
servlet-class>
servlet>
servlet-mapping>
servlet-name>Adminservlet-name>
url-pattern>/adminurl-pattern>
servlet-mapping>
security-constraint>
web-resource-collection>
web-resource-name>proxoolweb-resource-name>
url-pattern>/adminurl-pattern>
web-resource-collection>
auth-constraint>
role-name>managerrole-name>
auth-constraint>
security-constraint>
login-config>
auth-method>BASICauth-method>
realm-name>proxool manager Applicationrealm-name>
login-config>
security-role>
description>The role that is required to log in to the Manager Applicationdescription>
role-name>managerrole-name>
security-role>
error-page>
error-code>401error-code>
location>/401.jsplocation>
error-page>
web-app>
ServletConfigurator
org.logicalcobwebs.proxool.configuration.ServletConfigurator
xmlFile
WEB-INF/proxool.xml
1
Admin
org.logicalcobwebs.proxool.admin.servlet.AdminServlet
Admin
/admin
proxool
/admin
manager
BASIC
proxool manager Application
The role that is required to log in to the Manager Application
manager
401
/401.jsp
ServletConfigurator:加载并初始化proxool.xml文件,因为它是连接数据库的.其他很多模块都用到数据,所以必须首先加载它
load-on-startup:数值越小,就会先被加载初始化
Admin:监控数据库连接池的连接情况
//获得数据库连接的语句
Connection conn=DriverManager.getConnection("proxool.dbname");
注意:在401.jsp页面中必须加
这句话,否则在访问/admin察看连接池信息时,会直接跳转到401.jsp页面。我们是想让访问admin/的用户必须输入用户名和密码,且必须是manager角色,三次输入不正确才会跳到401.jsp页面,如图
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输入正确用户名和密码后才能看到proxool池的信息
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三、更详细的proxool.xml的配置属性说明:
![]()
Xml代码
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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-nsproxool:alias>
proxool:driver-url>jdbc:hsqldb:db/testproxool:driver-url>
proxool:driver-class>org.hsqldb.jdbcDriverproxool:driver-class>
proxool:driver-properties>
proxool:property name="user" value="sa"/>
proxool:property name="password" value=""/>
proxool:driver-properties>
proxool:house-keeping-sleep-time>40000proxool:house-keeping-sleep-time>
proxool:house-keeping-test-sql>select CURRENT_DATEproxool:house-keeping-test-sql>
proxool:maximum-connection-count>10proxool:maximum-connection-count>
proxool:minimum-connection-count>3proxool:minimum-connection-count>
proxool:maximum-connection-lifetime>18000000proxool:maximum-connection-lifetime>
proxool:simultaneous-build-throttle>5proxool:simultaneous-build-throttle>
proxool:recently-started-threshold>40000proxool:recently-started-threshold>
proxool:overload-without-refusal-lifetime>50000proxool:overload-without-refusal-lifetime>
proxool:maximum-active-time>60000proxool:maximum-active-time>
proxool:verbose>trueproxool:verbose>
proxool:trace>trueproxool:trace>
proxool:fatal-sql-exception>Fatal errorproxool:fatal-sql-exception>
proxool:prototype-count>2proxool:prototype-count>
proxool:proxool>
nothing-to-do-with-proxool>
proxool:proxool>
proxool:alias>xml-test-ns-2proxool:alias>
proxool:driver-url>jdbc:hsqldb:db/testproxool:driver-url>
proxool:driver-class>org.hsqldb.jdbcDriverproxool:driver-class>
proxool:driver-properties>
proxool:property name="user" value="sa"/>
proxool:property name="password" value=""/>
proxool:driver-properties>
proxool:house-keeping-sleep-time>40000proxool:house-keeping-sleep-time>
proxool:house-keeping-test-sql>select CURRENT_DATEproxool:house-keeping-test-sql>
proxool:maximum-connection-count>10proxool:maximum-connection-count>
proxool:minimum-connection-count>3proxool:minimum-connection-count>
proxool:maximum-connection-lifetime>18000000proxool:maximum-connection-lifetime>
proxool:simultaneous-build-throttle>5proxool:simultaneous-build-throttle>
proxool:recently-started-threshold>40000proxool:recently-started-threshold>
proxool:overload-without-refusal-lifetime>50000proxool:overload-without-refusal-lifetime>
proxool:maximum-active-time>60000proxool:maximum-active-time>
proxool:verbose>trueproxool:verbose>
proxool:trace>trueproxool:trace>
proxool:fatal-sql-exception>Fatal errorproxool:fatal-sql-exception>
proxool:prototype-count>2proxool:prototype-count>
proxool:proxool>
nothing-to-do-with-proxool>
something-else-entirely>
xml-test-ns
jdbc:hsqldb:db/test
org.hsqldb.jdbcDriver
40000
select CURRENT_DATE
10
3
18000000
5
40000
50000
60000
true
true
Fatal error
2
xml-test-ns-2
jdbc:hsqldb:db/test
org.hsqldb.jdbcDriver
40000
select CURRENT_DATE
10
3
18000000
5
40000
50000
60000
true
true
Fatal error
2
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
本文来自ChinaUnix博客,如果查看原文请点:http://blog.chinaunix.net/u1/59737/showart_2185731.html |
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