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20.2. Enabling HA with Static Failover

Overview
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To enable HA with static failover, you must do the following:
  1. Encode replica details in your service WSDL file
  2. Add the clustering feature to your client configuration

Encode replica details in your service WSDL file
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You must encode the details of the replicas in your cluster in your service WSDL file. Example 20.1, “Enabling HA with Static Failover: WSDL File” shows a WSDL file extract that defines a service cluster of three replicas.

Example 20.1. Enabling HA with Static Failover: WSDL File

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

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

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

</wsdl:service>
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The WSDL extract shown in Example 20.1, “Enabling HA with Static Failover: WSDL File” can be explained as follows:
1
Defines a service, ClusterService, which is exposed on three ports:
  1. Replica1
  2. Replica2
  3. Replica3
2
Defines Replica1 to expose the ClusterService as a SOAP over HTTP endpoint on port 9001.
3
Defines Replica2 to expose the ClusterService as a SOAP over HTTP endpoint on port 9002.
4
Defines Replica3 to expose the ClusterService as a SOAP over HTTP endpoint on port 9003.

Add the clustering feature to your client configuration
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In your client configuration file, add the clustering feature as shown in Example 20.2, “Enabling HA with Static Failover: Client Configuration”.

Example 20.2. 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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