Using Apache Camel and Restlet to get an API

Question

I’m doing a very simple Fuse integration application that takes a XML from an API website (data portal from Stockholms Stad). I’m using Apache Camel to route “from” the API url in “to” a new word doc file. The 2 files I have here are the Spring XML camel.context.xmlfile and the pom.xml for the dependencies:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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">
    <camelContext id="camel-fuse-api" xmlns="http://camel.apache.org/schema/spring">
        <route id="api2fuse">
            <!-- Input from Rest API -->
            <!-- Process the XML from the Rest API -->
            <!-- Output to a text file (TESTING the route) -->
            <from id="_from1" uri="restlet:http:80://data.stockholm.se/set/Befolkning/Befforandr/?apikey=<api-key>?restletMethod=GET"/>
            <to id="_to1" uri="file://C:/<localfile>?fileName=test_new_xml.txt"/>
            <log id="_log1" message="XML was copied to the local folder in a .txt file"/>
        </route>
    </camelContext>
    <bean class="org.restlet.Component" id="RestletComponent"/>
    <bean class="org.apache.camel.component.restlet.RestletComponent" id="RestletComponentService">
        <constructor-arg index="0">
            <ref bean="RestletComponent"/>
        </constructor-arg>
    </bean>
</beans>

The pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.cgi.fuse</groupId>
  <artifactId>camel-spring</artifactId>
  <version>1.0.0-SNAPSHOT</version>
  <packaging>bundle</packaging>
  <name>Fuse API</name>
  <description>Fuse integration for API</description>
  <licenses>
    <license>
      <name>Apache License, Version 2.0</name>
      <url>http://www.apache.org/licenses/LICENSE-2.0.html</url>
      <distribution>repo</distribution>
    </license>
  </licenses>
  <properties>
    <camel.version>2.17.0.redhat-630187</camel.version>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <version.maven-bundle-plugin>2.1.0</version.maven-bundle-plugin>
    <jboss.fuse.bom.version>6.3.0.redhat-187</jboss.fuse.bom.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <restlet.version>2.1.7</restlet.version>
  </properties>
  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>org.jboss.fuse.bom</groupId>
        <artifactId>jboss-fuse-parent</artifactId>
        <version>${jboss.fuse.bom.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>org.apache.camel</groupId>
      <artifactId>camel-core</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.camel</groupId>
      <artifactId>camel-spring</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-stream</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
    </dependency>
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.camel</groupId>
      <artifactId>camel-test-spring</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.activemq</groupId>
      <artifactId>activemq-camel</artifactId>
      <version>5.11.0.redhat-630187</version>
    </dependency>
    <dependency>
      <groupId>org.apache.camel</groupId>
      <artifactId>camel-jms</artifactId>
      <version>2.17.0.redhat-630187</version>
    </dependency>
    <dependency>
      <groupId>org.apache.camel</groupId>
      <artifactId>camel-cxf</artifactId>
      <version>2.17.0</version>
    </dependency>
    <dependency>
      <groupId>org.apache.camel</groupId>
      <artifactId>camel-restlet</artifactId>
      <version>2.17.0</version>
    </dependency>
    <dependency>
      <groupId>org.restlet.jee</groupId>
      <artifactId>org.restlet.ext.spring</artifactId>
      <version>2.2.0</version>
    </dependency>
  </dependencies>
  <repositories>
    <repository>
      <releases>
        <enabled>true</enabled>
        <updatePolicy>never</updatePolicy>
      </releases>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
      <id>fuse-public-repository</id>
      <name>FuseSource Community Release Repository</name>
      <url>https://repo.fusesource.com/nexus/content/groups/public</url>
    </repository>
    <repository>
      <releases>
        <enabled>true</enabled>
        <updatePolicy>never</updatePolicy>
      </releases>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
      <id>red-hat-ga-repository</id>
      <name>Red Hat GA Repository</name>
      <url>https://maven.repository.redhat.com/ga</url>
    </repository>
    <repository>  
   <id>maven-restlet</id>  
   <name>Public online Restlet repository</name>  
   <url>http://maven.restlet.org</url>  
</repository>
  </repositories>
  <pluginRepositories>
    <pluginRepository>
      <releases>
        <enabled>true</enabled>
        <updatePolicy>never</updatePolicy>
      </releases>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
      <id>fuse-public-repository</id>
      <name>FuseSource Community Release Repository</name>
      <url>https://repo.fusesource.com/nexus/content/groups/public</url>
    </pluginRepository>
    <pluginRepository>
      <releases>
        <enabled>true</enabled>
        <updatePolicy>never</updatePolicy>
      </releases>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
      <id>red-hat-ga-repository</id>
      <name>Red Hat GA Repository</name>
      <url>https://maven.repository.redhat.com/ga</url>
    </pluginRepository>
  </pluginRepositories>
  <build>
    <defaultGoal>install</defaultGoal>
    <plugins>
      <plugin>
        <groupId>org.apache.felix</groupId>
        <artifactId>maven-bundle-plugin</artifactId>
        <version>${version.maven-bundle-plugin}</version>
        <extensions>true</extensions>
        <configuration>
          <instructions>
            <Bundle-SymbolicName>Fuse</Bundle-SymbolicName>
            <Bundle-Name>Empty Camel Spring Example [Fuse]</Bundle-Name>
          </instructions>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.5.1</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-resources-plugin</artifactId>
        <version>3.0.1</version>
        <configuration>
          <encoding>UTF-8</encoding>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-maven-plugin</artifactId>
        <version>${camel.version}</version>
        <configuration>
          <fileApplicationContextUri>src/main/resources/META-INF/spring/camel-context.xml</fileApplicationContextUri>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

I’m running the project on “jboss-fuse-6.3.0.redhat-187” Runtime Server on JBoss Developer Studio 10.1.0 GA. I start the server but no file is created. It’s not functioning and I assume it’s some wrong syntax in the code.

Answer 1

You need to start from a timer if you want to call an external existing REST service.

from timer
   to restlet
   to file

What you do with

from restlet

is intended if you host a new REST service yourself.

And with the timer you need to find out how frequently you want to call that existing REST service. The timer has options you can configure for that.