Chapter 21. Enabling High Availability in Fuse Fabric

<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
           ...
           xmlns:cxf="http://cxf.apache.org/blueprint/core"
           ...
>
    ...
    <reference id="curator"
               interface="org.apache.curator.framework.CuratorFramework" />

    <!-- The FabricFailOverFeature will try to access other service endpoint with round rad -->
    <bean id="fabricLoadBalancerFeature" class="io.fabric8.cxf.FabricLoadBalancerFeature">
        <property name="curator" ref="curator" />
        <property name="fabricPath" value="cxf/demo" />
    </bean>

    <!-- setup the feature on the bus to help publish the services to the fabric-->
    <cxf:bus bus="cxf">
        <cxf:features>
            <ref component-id="fabricLoadBalancerFeature"/>
        </cxf:features>
    </cxf:bus>
    ...
</blueprint>

<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
           ...
           xmlns:jaxws="http://cxf.apache.org/blueprint/jaxws"
           xmlns:cxf="http://cxf.apache.org/blueprint/core"
           ...
>
    <!-- Create a client proxy, with load balancing enabled -->
    <jaxws:client id="ClientProxyBeanID"
        address="http://dummyaddress"
        serviceClass="SEI">
        <jaxws:features>
            <ref component-id="fabricLoadBalancerFeature" />
        </jaxws:features>
    </jaxws:client>
    ...
    <reference id="curator"
               interface="org.apache.curator.framework.CuratorFramework" />

    <!-- The FabricFailOverFeature will try to access other service endpoint with round rad -->
    <bean id="fabricLoadBalancerFeature" class="io.fabric8.cxf.FabricLoadBalancerFeature">
        <property name="curator" ref="curator" />
        <property name="fabricPath" value="ZKPath" />
    </bean>
    ...
</blueprint>

// Java
package io.fabric8.demo.cxf.client;

import org.apache.cxf.feature.AbstractFeature;
import org.apache.cxf.frontend.ClientProxyFactoryBean;
import org.apache.cxf.jaxws.JaxWsProxyFactoryBean;
import io.fabric8.cxf.FabricLoadBalancerFeature;
import io.fabric8.demo.cxf.Hello;

import java.util.ArrayList;
import java.util.List;

public class Client {
    
    private Hello hello;

    public void initializeHelloProxy() {
        // The feature will try to create a zookeeper client itself
        // by checking the system property of zookeeper.url
        FabricLoadBalancerFeature feature = new FabricLoadBalancerFeature();
        // Feature will use this path to locate the service
        feature.setFabricPath("demo/lb");

        ClientProxyFactoryBean clientFactory = new JaxWsProxyFactoryBean();
        clientFactory.setServiceClass(ClientProxyFactoryBean.class);
        // The address is not the actual address that the client will access
        clientFactory.setAddress("http://dummyaddress");

        List<AbstractFeature> features = new ArrayList<AbstractFeature>();
        features.add(feature);
        // we need to setup the feature on the client factory
        clientFactory.setFeatures(features);

        // Create the proxy of Hello
        hello = clientFactory.create(Hello.class);
    }
    
    public static void main(String args[]) {
        initializeHelloProxy();
        ...
    }
}