使用Amoeba Aladdin连接Oracle数据库

Amoeba是一个数据库代理，用他可以完成数据库Replication，Sharding，读写分离等等。Amoeba本身最适合mysql数据库，但是使用Amoeba Aladdin也可以链接其他支持jdbc的数据库。对于mysql数据库的配置，amoeba的 官方文档 有比较详细的介绍，但是对于aladdin很不详细（那个官方文档好像是根本没写完的样子）。经过一番摸索，配置了用amoeba连接Oracle的sharding集群。虽然和mysql的配置区别不大，还是在这里记录一下备忘。

首先，配置dbServer.xml：

 <?xml version="1.0" encoding="gbk"?>

 <!DOCTYPE amoeba:dbServers SYSTEM "dbserver.dtd">
 <amoeba:dbServers xmlns:amoeba="http://amoeba.meidusa.com/">

     <dbServer name="abstractServer" abstractive="true">

             <factoryConfig class="com.meidusa.amoeba.jdbc.JdbcConnectionFactory">
                 <property name="driver">
                     <bean class="com.meidusa.amoeba.jdbc.DriverWrapper">
                         <property name="driver">
                             <bean class="oracle.jdbc.driver.OracleDriver"/>
                         </property>
                     </bean>
                 </property>


                 <!-- jdbc url. -->
                 <property name="url">jdbc:oracle:thin:@xxx.xxx.xxx.xxx:1521:test</property>

                 <!-- url -->
                 <property name="properties">
                     <bean class="java.util.Properties">
                         <property name="user">user</property>
                         <property name="password">passwd</property>
                     </bean>
                 </property>

             </factoryConfig>
             <poolConfig class="com.meidusa.amoeba.net.poolable.PoolableObjectPool">
                 <property name="maxActive">200</property>
                 <property name="maxIdle">200</property>
                 <property name="minIdle">10</property>
                 <property name="minEvictableIdleTimeMillis">600000</property>
                 <property name="timeBetweenEvictionRunsMillis">600000</property>
                 <property name="testOnBorrow">true</property>
                 <property name="testWhileIdle">true</property>
             </poolConfig>
     </dbServer>

     <dbServer name="server1"  parent="abstractServer">
         <factoryConfig>
             <property name="url">jdbc:oracle:thin:xxx.xxx.xxx.xxx:1521:test</property>
         </factoryConfig>
     </dbServer>

     <dbServer name="server2"  parent="abstractServer">
         <factoryConfig>
             <property name="url">jdbc:oracle:thin:@xxx.xxx.xxx.xxx:1521:test</property>
         </factoryConfig>
     </dbServer>
 </amoeba:dbServers>

然后，amoeba.xml的配置：

 <?xml version="1.0" encoding="gbk"?>

 <!DOCTYPE amoeba:configuration SYSTEM "amoeba.dtd">
 <amoeba:configuration xmlns:amoeba="http://amoeba.meidusa.com/">

     <proxy>

         <!-- service class must implements com.meidusa.amoeba.service.Service -->
         <service name="Amoeba for Aladdin" class="com.meidusa.amoeba.net.ServerableConnectionManager">
             <!-- port -->
             <property name="port">8066</property>

             <!-- bind ipAddress -->
             <!--
             <property name="ipAddress">127.0.0.1</property>
              -->

             <property name="manager">${clientConnectioneManager}</property>

             <property name="connectionFactory">
                 <bean class="com.meidusa.amoeba.aladdin.net.AladdinClientConnectionFactory">
                     <property name="sendBufferSize">128</property>
                     <property name="receiveBufferSize">64</property>
                 </bean>
             </property>

             <property name="authenticator">
                 <bean class="com.meidusa.amoeba.mysql.server.MysqlClientAuthenticator">

                     <property name="user">user</property>

                     <property name="password">passwd</property>

                     <property name="filter">
                         <bean class="com.meidusa.amoeba.server.IPAccessController">
                             <property name="ipFile">${amoeba.home}/conf/access_list.conf</property>
                         </bean>
                     </property>
                 </bean>
             </property>

         </service>

         <!-- server class must implements com.meidusa.amoeba.service.Service -->
         <service name="Amoeba Monitor Server" class="com.meidusa.amoeba.monitor.MonitorServer">
             <!-- port -->
             <!--  default value: random number
             <property name="port">9066</property>
             -->
             <!-- bind ipAddress -->
             <property name="ipAddress">127.0.0.1</property>
             <property name="daemon">true</property>
             <property name="manager">${clientConnectioneManager}</property>
             <property name="connectionFactory">
                 <bean class="com.meidusa.amoeba.monitor.net.MonitorClientConnectionFactory"></bean>
             </property>

         </service>

         <runtime class="com.meidusa.amoeba.mysql.context.MysqlRuntimeContext">
             <!-- proxy server net IO Read thread size -->
             <property name="readThreadPoolSize">20</property>

             <!-- proxy server client process thread size -->
             <property name="clientSideThreadPoolSize">30</property>

             <!-- mysql server data packet process thread size -->
             <property name="serverSideThreadPoolSize">30</property>

             <!-- per connection cache prepared statement size  -->
             <property name="statementCacheSize">500</property>

             <!-- query timeout( default: 60 second , TimeUnit:second) -->
             <property name="queryTimeout">60</property>

             <property name="serverCharset">utf8</property>
         </runtime>

     </proxy>

     <!--
         Each ConnectionManager will start as thread
         manager responsible for the Connection IO read , Death Detection
     -->
     <connectionManagerList>
         <connectionManager name="clientConnectioneManager" class="com.meidusa.amoeba.net.MultiConnectionManagerWrapper">
             <property name="subManagerClassName">com.meidusa.amoeba.net.ConnectionManager</property>
             <!--
               default value is avaliable Processors
             <property name="processors">5</property>
              -->
         </connectionManager>
         <connectionManager name="defaultManager" class="com.meidusa.amoeba.net.MultiConnectionManagerWrapper">
             <property name="subManagerClassName">com.meidusa.amoeba.net.AuthingableConnectionManager</property>

             <!--
               default value is avaliable Processors
             <property name="processors">5</property>
              -->
         </connectionManager>
     </connectionManagerList>

         <!-- default using file loader -->
     <dbServerLoader class="com.meidusa.amoeba.context.DBServerConfigFileLoader">
         <property name="configFile">${amoeba.home}/conf/dbServers.xml</property>
     </dbServerLoader>

     <queryRouter class="com.meidusa.amoeba.aladdin.parser.AladdinQueryRouter">
         <property name="ruleLoader">
             <bean class="com.meidusa.amoeba.route.TableRuleFileLoader">
                 <property name="ruleFile">${amoeba.home}/conf/rule.xml</property>
                 <property name="functionFile">${amoeba.home}/conf/ruleFunctionMap.xml</property>
             </bean>
         </property>
         <property name="sqlFunctionFile">${amoeba.home}/conf/functionMap.xml</property>
         <property name="LRUMapSize">1500</property>
         <property name="defaultPool">server1</property>

         <!--
         <property name="writePool">server1</property>
         <property name="readPool">server1</property>
         -->
         <property name="needParse">true</property>
     </queryRouter>
 </amoeba:configuration>

最后，rule.xml的配置，和mysql是一样的：

 <?xml version="1.0" encoding="gbk"?>
 <!DOCTYPE amoeba:rule SYSTEM "rule.dtd">

 <amoeba:rule xmlns:amoeba="http://amoeba.meidusa.com/">

     <tableRule name="staff" schema="test" defaultPools="server1,server2">

         <rule name="rule1" ruleResult="POOLNAME">
             <parameters>ID</parameters>
             <expression><![CDATA[
             var division = ID % 2;
             case division when 0 then 'server1';
             when 1 then 'server2';
             end case;]]></expression>
         </rule>

     </tableRule>

 </amoeba:rule>