Redis组件允许你从Redis接收消息,以及将消息发送给Redis。RedisProducer的功能很强大,几乎能执行所有的Redis Command,这些Command都是在Message的header中进行设置的。遗憾的是RedisConsumer仅仅支持pub/sub模式,不支持Point2Point,这意味这在Camel中,通过阻塞的方式消费Lists中的消息是不可行的。我反馈了这个问题到Apache Camel Mail List,希望以后的版本支持P2P更能。下面演示如何使用camel-spring-redis组件。
使用Spring
1,创建Maven工程,添加camel-spring-redis引用,pom.xml文件内容如下:
<dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-core</artifactId> <version>2.17.0</version> </dependency> <dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-spring</artifactId> <version>2.17.0</version> </dependency> <dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-spring-redis</artifactId> <version>2.17.0</version> </dependency> </dependencies>
2,在资源文件下下创建spring bean配置文件,内容如下:
<?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" 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"> <bean id="connectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"> <property name="hostName" value="localhost" /> <property name="port" value="9999" /> <property name="password" value="1234567890" /> </bean> <bean id="serializer" class="org.springframework.data.redis.serializer.StringRedisSerializer" /> <camelContext id="camel" xmlns="http://camel.apache.org/schema/spring"> <route startupOrder="1"> <from uri="timer://foo?fixedRate=true&period=1000"/> <setHeader headerName="CamelRedis.Command"> <constant>SET</constant> </setHeader> <setHeader headerName="CamelRedis.Key"> <constant>keyOne</constant> </setHeader> <setHeader headerName="CamelRedis.Value"> <constant>valueOne</constant> </setHeader> <to uri="spring-redis://localhost:9999?connectionFactory=#connectionFactory&serializer=#serializer"/> </route> </camelContext> </beans>
上边的beans文件中,定义了bean connectionFactory,可以设置redis服务器的相关信息,比如密码。如果你的redis服务器没有设置密码,那么这个bean定义可以省略,此时配置文件如下:
<?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" 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"> <bean id="serializer" class="org.springframework.data.redis.serializer.StringRedisSerializer" /> <camelContext id="camel" xmlns="http://camel.apache.org/schema/spring"> <route startupOrder="1"> <from uri="timer://foo?fixedRate=true&period=1000"/> <setHeader headerName="CamelRedis.Command"> <constant>SET</constant> </setHeader> <setHeader headerName="CamelRedis.Key"> <constant>keyOne</constant> </setHeader> <setHeader headerName="CamelRedis.Value"> <constant>valueOne</constant> </setHeader> <to uri="spring-redis://localhost:9999?serializer=#serializer"/> </route> </camelContext> </beans>
setHeader中设置了Redis的相关命令,RedisProducer支持几乎所有的RedisCmmand,具体可参见Redis Component官网。
这里的意思是每隔1S为Redis服务器的keyOnve设置一个值valueOne。
3, 创建App3.java,启动spring。
/** * Created by sam on 5/10/16. */ public class App3 { public static void main(String[] args) throws Exception { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("context.xml"); context.start(); System.in.read(); } }
启动ClassPathXmlApplicationContext的时候,系统会自动创建并运行CamelContext。
监控Redis,得到结果如下:
[[email protected] redis-2.8.19]$ src/redis-cli -p 9999 -a 1234567890 127.0.0.1:9999> MONITOR OK 1462931627.929228 [0 127.0.0.1:50939] "PING" 1462931686.110952 [0 127.0.0.1:50943] "AUTH" "1234567890" 1462931686.120240 [0 127.0.0.1:50943] "SET" "keyOne" "valueOne" 1462931687.065705 [0 127.0.0.1:50943] "SET" "keyOne" "valueOne" 1462931688.066442 [0 127.0.0.1:50943] "SET" "keyOne" "valueOne" 1462931689.066169 [0 127.0.0.1:50943] "SET" "keyOne" "valueOne" 1462931690.065948 [0 127.0.0.1:50943] "SET" "keyOne" "valueOne" 1462931691.065674 [0 127.0.0.1:50943] "SET" "keyOne" "valueOne"
不使用Spring
公司不是所有的项目都用了Spring,所以研究了两天,做了个非Spring的Demo,还是maven工程,pom.xml配置文件和上边的一样,创建app4.java类,代码如下:
public class App4 { public static void main(String[] args) throws Exception { JedisConnectionFactory connectionFactory = new JedisConnectionFactory(); // 创建connectionFactory connectionFactory.setHostName("localhost"); connectionFactory.setPassword("1234567890"); connectionFactory.setPort(9999); SimpleRegistry registry = new SimpleRegistry(); connectionFactory.afterPropertiesSet(); // 必须要调用该方法来初始化connectionFactory registry.put("connectionFactory", connectionFactory); //注册connectionFactory registry.put("serializer", new StringRedisSerializer()); //注册serializer CamelContext context = new DefaultCamelContext(registry); context.addRoutes(new RouteBuilder() { public void configure() { errorHandler(deadLetterChannel("stream:out")); from("timer://foo?fixedRate=true&period=1000"). setHeader("CamelRedis.Command", constant("PUBLISH")). setHeader("CamelRedis.Channel", constant("testChannel")). setHeader("CamelRedis.Message", constant(new Date().toString())). to("spring-redis://localhost:9999?connectionFactory=#connectionFactory&serializer=#serializer"); } }); context.setTracing(true); context.start(); Thread.sleep(Integer.MAX_VALUE); context.stop(); } }
这段代码主要是使用SimpleRegistry来注册bean信息,并将SimpleRegistry作为CamelContext的参数,这样在endpoint的Url中就可以使用之前注册的bean了。
另外在创建完connectionFactory后要调用afterPropertiesSet()方法来完成初始化。如果你的redis没有设置密码,并且不需要serializer,那么代码更简单,如下:
public class App4 { public static void main(String[] args) throws Exception { CamelContext context = new DefaultCamelContext(); context.addRoutes(new RouteBuilder() { public void configure() { errorHandler(deadLetterChannel("stream:out")); from("timer://foo?fixedRate=true&period=1000"). setHeader("CamelRedis.Command", constant("PUBLISH")). setHeader("CamelRedis.Channel", constant("testChannel")). setHeader("CamelRedis.Message", constant(new Date().toString())). to("spring-redis://localhost:9999"); } }); context.setTracing(true); context.start(); Thread.sleep(Integer.MAX_VALUE); context.stop(); } }
以上代码经测试,都可运行。