Fuse ESB - Configuring Web Service Endpoints - Enabling HA with Static Failover

Enabling HA with Static Failover

Overview

To enable HA with static failover, you must do the following:

Encode replica details in your service WSDL file

You must encode the details of the replicas in your cluster in your service WSDL file. Example 8.1 shows a WSDL file extract that defines a service cluster of three replicas.

Example 8.1. Enabling HA with Static Failover—WSDL File

<wsdl:service name="ClusteredService">
    <wsdl:port binding="tns:Greeter_SOAPBinding" name="Replica1">
        <soap:address location="http://localhost:9001/SoapContext/Replica1"/>
    </wsdl:port>

    <wsdl:port binding="tns:Greeter_SOAPBinding" name="Replica2">
        <soap:address location="http://localhost:9002/SoapContext/Replica2"/>
    </wsdl:port>

    <wsdl:port binding="tns:Greeter_SOAPBinding" name="Replica3">
        <soap:address location="http://localhost:9003/SoapContext/Replica3"/>
    </wsdl:port>

</wsdl:service>

The WSDL extract shown in Example 8.1 can be explained as follows:

	Defines a service, `ClusterService`, which is exposed on three ports: `Replica1` `Replica2` `Replica3`
	Defines `Replica1` to expose the `ClusterService` as a SOAP over HTTP endpoint on port `9001`.
	Defines `Replica2` to expose the `ClusterService` as a SOAP over HTTP endpoint on port `9002`.
	Defines `Replica3` to expose the `ClusterService` as a SOAP over HTTP endpoint on port `9003`.

Add the clustering feature to your client configuration

In your client configuration file, add the clustering feature as shown in Example 8.2.

Example 8.2. Enabling HA with Static Failover—Client Configuration

<?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:jaxws="http://cxf.apache.org/jaxws"
       xmlns:clustering="http://cxf.apache.org/clustering"
         xsi:schemaLocation="http://cxf.apache.org/jaxws
         http://cxf.apache.org/schemas/jaxws.xsd
         http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans.xsd">
    
    <jaxws:client name="{http://apache.org/hello_world_soap_http}Replica1"
                  createdFromAPI="true">
        <jaxws:features>
            <clustering:failover/>
        </jaxws:features>
    </jaxws:client>

    <jaxws:client name="{http://apache.org/hello_world_soap_http}Replica2"
                  createdFromAPI="true">
        <jaxws:features>
            <clustering:failover/>
        </jaxws:features>
    </jaxws:client>

    <jaxws:client name="{http://apache.org/hello_world_soap_http}Replica3"
                  createdFromAPI="true">
        <jaxws:features>
            <clustering:failover/>
        </jaxws:features>
    </jaxws:client>
    
</beans>

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