[英]Configuring datasources at runtime with Camel
我確實在Apache Camel中設置了一條非常簡單的路由,其中將查詢發送到JDBC組件以執行。 我啟動並運行了駱駝項目。 我要完成的工作是在RabbitMQ消息的標頭中發送dataSource1的數據庫連接參數。 通過連接參數,我的意思是driverClassName,URL,用戶名,密碼。 我的應用程序的客戶端將輸入所有這些參數,以確定要連接到哪個數據庫。 根據用戶指定的driverClassName用戶,我可能會使用路由清單,但這是另一回事。
請注意,在此示例中,我將SQL語句放在文件中以使其更簡單。 我該怎么做?
這是我的駱駝語境:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:camel="http://camel.apache.org/schema/spring"
xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd">
<camel:camelContext xmlns="http://camel.apache.org/schema/spring">
<camel:route>
<camel:from uri="file:src/data?noop=true"/>
<camel:to uri="jdbc:dataSource1"/>
<camel:convertBodyTo type="java.lang.String"/>
<camel:log message="${body}"/>
</camel:route>
</camel:camelContext>
<bean id="dataSource1"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/employees"/>
<property name="username" value="root"/>
<property name="password" value=""/>
</bean>
</beans>
和Maven項目:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>group1</groupId>
<artifactId>com.mycompany</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>A Camel Spring Route</name>
<url>http://www.myorganization.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-core</artifactId>
<version>2.12.2</version>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-spring</artifactId>
<version>2.12.2</version>
</dependency>
<!-- logging -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.5</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.5</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- testing -->
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-test-spring</artifactId>
<version>2.12.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.26</version>
</dependency>
<!-- Jdbc -->
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-jdbc</artifactId>
<version>2.12.2</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.0.0.RELEASE</version>
</dependency>
</dependencies>
<build>
<defaultGoal>install</defaultGoal>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.5.1</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.6</version>
<configuration>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<!-- allows the route to be ran via 'mvn camel:run' -->
<plugin>
<groupId>org.apache.camel</groupId>
<artifactId>camel-maven-plugin</artifactId>
<version>2.12.2</version>
</plugin>
</plugins>
</build>
</project>
數據源是一個Spring bean。 創建自己的bean,並讓Spring注入數據源。 然后,您可以插入的JDBC步驟之前,該bean到您的路線,並使用交換頂部,它應該包含的JMS頭,更新數據源的屬性。
但是,我認為這種設計方法會帶來麻煩:
可能還有更多...
也許幾年后。 購買后,我使用AbstractRoutingDataSource實現了該功能,該功能允許動態更改數據源(無需重置連接池或路由)
參考鏈接: https : //spring.io/blog/2007/01/23/dynamic-datasource-routing/
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