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Developing Camel mediators with iPOJO

...

So now, it is time to create the interface that we will use in the project. Create a new folder "service" in src/main/java/demo tree. Add the interface TransformService.java and copy paste the code below:

java

Code Block

	java
title	TransformService.java
	java

package demo.service;
public interface TransformService {
    public Object transform(Object obj);
}

...

Next, we will create the class TransformServiceImpl implementing the interface TransformService.
Create the class TransformServiceImpl.java in the folder src/main/java/demo/service/

java

Code Block

	java
title	TransformServiceImpl.java
	java

package demo.service;

import java.util.Date;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class TransformServiceImpl implements TransformService {
    private static final transient Log LOG = LogFactory.getLog(TransformServiceImpl.class);
    private boolean verbose = true;
    private String prefix = "MyTransform";

    public Object transform(Object body) {
        String answer = prefix + " set body:  " + new Date();
        if (verbose) {
            System.out.println(">> call >> " + answer);
        }
        LOG.info(">> call >>" + answer);
        return answer;
    }

    public boolean isVerbose() {
        return verbose;
    }

    public void setVerbose(boolean verbose) {
        this.verbose = verbose;
    }

    public String getPrefix() {
        return prefix;
    }

    public void setPrefix(String prefix) {
        this.prefix = prefix;
    }
}

...

The next step concerns the creation of the iPOJO configuration file who will allow the registration of the TranformService as an OSGi service.
Create or edit the file metadata.xml in the folder src/main/resources/

Code Block

	xml	xml
title	metadata.xml
	xml

<?xml version="1.0" encoding="UTF-8"?>
<ipojo>
	<component classname="demo.service.TransformServiceImpl" name="my-ipojo-transformer">
   		<provides/>
	</component>
	<instance component="my-ipojo-transformer"/>
</ipojo>

...

Before generating the bundle, we need to edit the pom.xml file to describe our bundle.

Code Block

	xml	xml
title	pom.xml
	xml

<project>
  <modelVersion>4.0.0</modelVersion>
  <packaging>bundle</packaging>
  <groupId>demo</groupId>
  <artifactId>demo.service-ipojo-bundle</artifactId>
  <version>0.1</version>
  <name>demo.service-ipojo-bundle</name>
  
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.felix</groupId>
        <artifactId>maven-bundle-plugin</artifactId>
        <version>1.4.2</version>
        <extensions>true</extensions>
        <configuration>
          <instructions>
            <Bundle-SymbolicName>${pom.artifactId}</Bundle-SymbolicName>
            <Import-Package>*</Import-Package>
            <Export-Package>*</Export-Package>
          </instructions>
        </configuration>
      </plugin>
      <plugin>
	      <groupId>org.apache.felix</groupId>
	      <artifactId>maven-ipojo-plugin</artifactId>
		  <executions>
          	<execution>
            	<goals>
	              <goal>ipojo-bundle</goal>
               </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
  
  <dependencies>
	  <dependency>
          <groupId>org.slf4j</groupId>
          <artifactId>com.springsource.slf4j.org.apache.commons.logging</artifactId>
          <version>1.5.0</version>
          <scope>provided</scope>
        </dependency>
        <dependency>
          <groupId>org.slf4j</groupId>
          <artifactId>com.springsource.slf4j.api</artifactId>
          <version>1.5.0</version>
          <scope>provided</scope>
        </dependency>
        <dependency>
          <groupId>org.slf4j</groupId>
          <artifactId>com.springsource.slf4j.log4j</artifactId>
          <version>1.5.0</version>
          <scope>provided</scope>
          <exclusions>
            <exclusion>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.apache.log4j</groupId>
                <artifactId>com.springsource.org.apache.log4j</artifactId>
            </exclusion>
          </exclusions>
        </dependency>
    </dependencies>
</project>

...

In case of trouble, use the command: osgi list to see if all the deployed bundles are installed correctly and have their status equals to active
To see the log of ServiceMix, use the command: log d

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