proxool配置详解
Proxool一個數據庫連接池框架，提供了對你選擇的其它類型的驅動程序的連接池封裝?？梢苑浅：唵蔚囊浦驳浆F存的代碼中。
<?xml version=”1.0” encoding=”UTF-8”?>
<something-else-entriely>
?????? <proxool>
????????????? <alias>dbname</alias><!—數據源的別名-->
????????????? <driver-url>jdbc:oracle:thin:@127.0.0.1:1521:testdb</driver-url><!—url連接串-->
?????? <driver-class>oracle</driver-class><!—驅動類-->
?????? <driver-properties>
????????????? <property name=”user” value=”username”/><!—用戶名-->
????????????? <property name=”password” value=”password”/><!—密碼-->
</driver-properties>
<!—最大連接數（默認5個），超過了這個連接數，再有請求是，就排在隊列中等待，最大的等待請求書又maximum-new-connections決定-->
<maximum-connection-count>100</maximum-connection-count>
<!—最小連接數(默認2個)-->
<minimum-connection-count>10</minimum-connection-count>
?????? <!—proxool自動偵探各個連接狀態的時間間隔(毫秒),偵探到空閑的就馬上收回，超時的銷毀? 默認30秒-->
?????? <house-keeping-sleep-time>90000</house-keeping-sleep-time>
?????? <!—沒有空閑連接可以分配而在隊列中等候的最大請求書，超過這個請求數的用戶連接就不會被接受-->
?????? <maximum-new-connections>400</maximum-new-connections>
?????? <!—最少保持的空閑連接數(默認2個)-->
?????? <prototype-count>5</prototype-count>
?????? <!—在使用之前測試-->
?????? <test-before-use>true</test-before-use>
?????? <!—用戶保持連接的測試語句—>
?????? <house-keeping-test-sql>select sysdate from dual</house-keeping-test-sql>
</proxool>
</something-else-entriely>
?
配置web.xml
<?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>
<!--?配置受保護域，只有Tomcat管理員才能察看連接池的信息?-->??
<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>
?
?
ServletConfigurator:加載并初始化proxool.xml文件，因為它是連接數據庫的。其他很多模塊都用到數據，所以必須首先加載它
load-on-startup:數值越小，就會先被加載初始化
Admin:監控數據庫連接池連接情況
//獲得數據庫的語句
Connection conn = DriverManager.getConnection(“proxool.dbname”);
?
Proxool.xml配置屬性說明
Xml代碼：
<?xml version="1.0" encoding="ISO-8859-1"?>?
<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>
屬性列表說明:
fatal-sql-exception: 它是一個逗號分割的信息片段.當一個SQL異常發生時,他的異常信息將與這個信息片段進行比較.如果在片段中存在,那么這個異常將被認為是個致命錯誤(Fatal SQL Exception ).這種情況下,數據庫連接將要被放棄.無論發生什么,這個異常將會被重擲以提供給消費者.用戶最好自己配置一個不同的異常來拋出.
fatal-sql-exception-wrapper-class:正如上面所說,你最好配置一個不同的異常來重擲.利用這個屬性,用戶可以包裝SQLException,使他變成另外一個異常.這個異?；蛘呃^承SQLException或者繼承字RuntimeException.proxool自帶了2個實現:'org.logicalcobwebs.proxool.FatalSQLException' 和'org.logicalcobwebs.proxool.FatalRuntimeException' .后者更合適.
house-keeping-sleep-time: house keeper 保留線程處于睡眠狀態的最長時間,house keeper 的職責就是檢查各個連接的狀態,并判斷是否需要銷毀或者創建.
house-keeping-test-sql:? 如果發現了空閑的數據庫連接.house keeper 將會用這個語句來測試.這個語句最好非常快的被執行.如果沒有定義,測試過程將會被忽略。
injectable-connection-interface: 允許proxool實現被代理的connection對象的方法.
injectable-statement-interface: 允許proxool實現被代理的Statement 對象方法.
injectable-prepared-statement-interface: 允許proxool實現被代理的PreparedStatement 對象方法.
injectable-callable-statement-interface: 允許proxool實現被代理的CallableStatement 對象方法.
jmx: 略
jmx-agent-id: 略
jndi-name: 數據源的名稱
maximum-active-time: 如果housekeeper 檢測到某個線程的活動時間大于這個數值.它將會殺掉這個線程.所以確認一下你的服務器的帶寬.然后定一個合適的值.默認是5分鐘.
maximum-connection-count: 最大的數據庫連接數.
maximum-connection-lifetime: 一個線程的最大壽命.
minimum-connection-count: 最小的數據庫連接數
overload-without-refusal-lifetime: 略
prototype-count: 連接池中可用的連接數量.如果當前的連接池中的連接少于這個數值.新的連接將被建立(假設沒有超過最大可用數).例如.我們有3個活動連接2個可用連接,而我們的prototype-count是4,那么數據庫連接池將試圖建立另外2個連接.這和 minimum-connection-count不同. minimum-connection-count把活動的連接也計算在內.prototype-count 是spare connections 的數量.
recently-started-threshold:? 略
simultaneous-build-throttle:? 略
statistics: ?連接池使用狀況統計。參數“10s,1m,1d”
statistics-log-level:? 日志統計跟蹤類型。參數“ERROR”或 “INFO”
test-before-use: 略
test-after-use: 略
trace: 如果為true,那么每個被執行的SQL語句將會在執行期被log記錄(DEBUG LEVEL).你也可以注冊一個ConnectionListener (參看ProxoolFacade)得到這些信息.
verbose: 詳細信息設置。參數 bool 值
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總結
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